GPIB-M-XPD
GPIB-M-XT
GPIB-M-HPD
GPIB-M-XHR
GPIB-M-XFR
GPIB-M-XFR3
Operating Manual
Internal GPIB-M Interface:
Multichannel Functionality
for Programmable DC
Power Supplies
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Operating Manual for
Internal GPIB-M Interface:
Multichannel Functionality
for Programmable DC
Power Supplies
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Limited What does this warranty cover and how long does it last?
Warranty
This Limited Warranty is provided by Xantrex Technology, Inc. (“Xantrex”) and
covers defects in workmanship and materials in your GPIB-M Interface Card. This
warranty lasts for a Warranty Period of 5 years from the date of purchase at point of
sale to you, the original end user customer.
What will Xantrex do?
Xantrex will, at its option, repair or replace the defective product free of charge,
provided that you notify Xantrex of the product defect within the Warranty Period,
and provided that Xantrex through inspection establishes the existence of such a
defect and that it is covered by this Limited Warranty.
Xantrex will, at its option, use new and/or reconditioned parts in performing
warranty repair and building replacement products. Xantrex reserves the right to use
parts or products of original or improved design in the repair or replacement. If
Xantrex repairs or replaces a product, its warranty continues for the remaining
portion of the original Warranty Period or 90 days from the date of the return
shipment to the customer, whichever is greater. All replaced products and all parts
removed from repaired products become the property of Xantrex.
Xantrex covers both parts and labor necessary to repair the product, and return
shipment to the customer via a Xantrex-selected non-expedited surface freight
within the contiguous United States and Canada. Alaska and Hawaii are excluded.
Contact Xantrex Customer Service for details on freight policy for return shipments
outside of the contiguous United States and Canada.
How do you get service?
If your product requires troubleshooting or warranty service, contact your merchant.
If you are unable to contact your merchant, or the merchant is unable to provide
service, contact Xantrex directly at:
Phone:
604 422 8595
Toll Free North America:
1 800 667 8422
604 421 3056
Fax:
Email:
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Direct returns may be performed according to the Xantrex Return Material
Authorization Policy described in your product manual. For some products, Xantrex
maintains a network of regional Authorized Service Centers. Call Xantrex or check
our website to see if your product can be repaired at one of these facilities.
In any warranty claim, dated proof of purchase must accompany the product and the
product must not have been disassembled or modified without prior written
authorization by Xantrex.
Proof of purchase may be in any one of the following forms:
•
•
•
The dated purchase receipt from the original purchase of the product at point of
sale to the end user, or
The dated dealer invoice or purchase receipt showing original equipment
manufacturer (OEM) status, or
The dated invoice or purchase receipt showing the product exchanged under
warranty
What does this warranty not cover?
This Limited Warranty does not cover normal wear and tear of the product or costs
related to the removal, installation, or troubleshooting of the customer’s electrical
systems. This warranty does not apply to and Xantrex will not be responsible for any
defect in or damage to:
a. the product if it has been misused, neglected, improperly installed, physically
damaged or altered, either internally or externally, or damaged from improper
use or use in an unsuitable environment;
b. the product if it has been subjected to fire, water, generalized corrosion,
biological infestations, and high input voltage from lightning strikes;
c. the product if repairs have been done to it other than by Xantrex or its authorized
service centers (hereafter “ASCs”);
d. the product if it is used as a component part of a product expressly warranted by
another manufacturer;
e. the product if its original identification (trade-mark, serial number) markings
have been defaced, altered, or removed.
Release 2.1
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Disclaimer Product
THIS LIMITED WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY PROVIDED
BY XANTREX IN CONNECTION WITH YOUR XANTREX PRODUCT AND IS, WHERE
PERMITTED BY LAW, IN LIEU OF ALL OTHER WARRANTIES, CONDITIONS,
GUARANTEES, REPRESENTATIONS, OBLIGATIONS AND LIABILITIES, EXPRESS
OR IMPLIED, STATUTORY OR OTHERWISE IN CONNECTION WITH THE PRODUCT,
HOWEVER ARISING (WHETHER BY CONTRACT, TORT, NEGLIGENCE, PRINCIPLES
OF MANUFACTURER’S LIABILITY, OPERATION OF LAW, CONDUCT, STATEMENT
OR OTHERWISE), INCLUDING WITHOUT RESTRICTION ANY IMPLIED WARRANTY
OR CONDITION OF QUALITY, MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. ANY IMPLIED WARRANTY OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE TO THE EXTENT REQUIRED UNDER
APPLICABLE LAW TO APPLY TO THE PRODUCT SHALL BE LIMITED IN DURATION
TO THE PERIOD STIPULATED UNDER THIS LIMITED WARRANTY.
IN NO EVENT WILL XANTREX BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOSSES, COSTS OR EXPENSES
HOWEVER ARISING WHETHER IN CONTRACT OR TORT INCLUDING WITHOUT
RESTRICTION ANY ECONOMIC LOSSES OF ANY KIND, ANY LOSS OR DAMAGE TO
PROPERTY, ANY PERSONAL INJURY, ANY DAMAGE OR INJURY ARISING FROM OR
AS A RESULT OF MISUSE OR ABUSE, OR THE INCORRECT INSTALLATION,
INTEGRATION OR OPERATION OF THE PRODUCT.
Exclusions If this product is a consumer product, federal law does not allow an exclusion of
implied warranties. To the extent you are entitled to implied warranties under federal
law, to the extent permitted by applicable law they are limited to the duration of this
Limited Warranty. Some states and provinces do not allow limitations or exclusions
on implied warranties or on the duration of an implied warranty or on the limitation
or exclusion of incidental or consequential damages, so the above limitation(s) or
exclusion(s) may not apply to you. This Limited Warranty gives you specific legal
rights. You may have other rights which may vary from state to state or province to
province.
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Information WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, UNLESS
SPECIFICALLY AGREED TO BY IT IN WRITING, XANTREX
a. MAKES NO WARRANTY AS TO THE ACCURACY, SUFFICIENCY OR SUITABILITY
OF ANY TECHNICAL OR OTHER INFORMATION PROVIDED IN MANUALS OR
OTHER DOCUMENTATION PROVIDED BY IT IN CONNECTION WITH THE
PRODUCT; AND
b. ASSUMES NO RESPONSIBILITY OR LIABILITY FOR LOSSES, DAMAGES,
COSTS OR EXPENSES, WHETHER SPECIAL, DIRECT, INDIRECT,
CONSEQUENTIAL OR INCIDENTAL, WHICH MIGHT ARISE OUT OF THE USE OF
SUCH INFORMATION.
THE USE OF ANY SUCH INFORMATION WILL BE ENTIRELY AT THE USER’S RISK.
WARNING: Please refer to your product user manual for limitations on uses of the product.
Specifically, please note that this power supply is not intended for use in connection
with life support systems and Xantrex makes no warranty or representation in
connection with any use of the product for such purposes.
Limitations
on Use
Xantrex Technology, Inc.
8999 Nelson Way
Burnaby, British Columbia
Canada V5A 4B5
Information Please record the following information when you first open your Power Supply
package:
About Your
Power
Model Number
Serial Number
Purchased From
Purchase Date
______________________________________________
______________________________________________
______________________________________________
______________________________________________
Supply
Release Release 2.1 (2003-04)
Copyright
2002 Xantrex Technology Inc. All rights reserved.
©
Printed in Canada
Release 2.1
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Power
Supply
Safety
WARNING—High Energy and High Voltage
Exercise caution when using and calibrating a power supply. High energy levels
can be stored at the output voltage terminals on a power supply in normal
operation. In addition, potentially lethal voltages exist in the power circuit and on
the output and sense connectors of a power supply with a rated output greater
than 40 V. Filter capacitors store potentially dangerous energy for some time after
power is removed.
CAUTION
!
Operate the power supply in an environment free of flammable gases or fumes.
To ensure that the power supply’s safety features are not compromised, use the
power supply as specified in this manual and do not substitute parts or make any
unauthorized modifications. Contact the service technician for service and repair
help. Repairs must be made by experienced service technicians only.
Warnings, Warnings, cautions, and notes are defined and formatted in this manual as shown
below.
Cautions,
and Notes
WARNING
Describes a potential hazard which could result in injury or death, or, a procedure
which, if not performed correctly, could result in injury or death.
CAUTION
!
Describes a procedure which, if not performed correctly, could result in damage
to data, equipment, or systems.
Note
Describes additional operating information which may affect the performance of the
equipment.
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About This Manual
This operating manual is for the internal Multichannel Interface (GPIB-M), a
microprocessor-controlled option card for your DC output power supply. This
manual provides you with descriptions and specifications, user options, and
configuration instructions, in addition to a command set which enables you to
manage the power supply from an external source. Error messages and calibration
procedures are also included.
This manual is designed for the user who is familiar with basic electrical theory
especially as it applies to the operation of power supplies. This implies a recognition
of Constant Voltage and Constant Current operation modes and the control of input
and output power, as well as the observance of safe techniques while effecting supply
or pin connections and any changes in switch settings. The user should also have
experience with a computer-based communications software package.
Refer to your power supply manual for installation, configuration, and operating
procedures for your power supply.
Main Sections
Section 1 Features and Specifications Describes the power supply and lists
its features and specifications.
Section 2 Installation and Configuration Gives basic setup procedures.
Describes inspection, cleaning, shipping, and storage procedures. Includes
additional options for configuring the GPIB-M interface for operation.
Section 3 Operation Describes operation of each feature.
Section 4 Status Registers Details status registers and how to use them to
monitor the power supply status.
Section 5 Current Sharing Explains how to configure the power supply for
current sharing among units connected in parallel.
Appendix A GPIB Describes the General Purpose Interface Bus (GPIB)
commands and lines supported by specific products with the Multichannel Interface
installed.
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About This Manual
Appendix B SCPI Command Reference Describes the Standard Commands
for Programmable Instruments (SCPI) commands supported by various products
with the Multichannel Interface installed.
Appendix C Error Messages Describes the error messages that could appear
during operation.
Appendix D Calibration Provides the calibration procedures and parameters.
Manual Revisions
The current release of this manual is listed below. Updates may be issued as an
addendum.
Release 2.1 (2003-04)
Power Supply Safety Markings
Alternating Current
Off (Supply)
On (Supply)
Earth (Ground) Terminal
Caution (Check manual for
additional information.)
Protective Conductor Terminal
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About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiii
Section 1. Features and Specifications
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Features and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Programmable Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Readback Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Section 2. Installation and Configuration
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Basic Setup Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Setup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Configure for Multichannel Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Configuration of CAN-only Interface Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Multichannel Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Broadcasting Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Section 3. Operation
Power-On. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Output Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Soft Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
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Power Supply Regulation Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Constant Voltage (CV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Constant Current (CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Automatic Mode Crossover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Readback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Fold Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
AC Off Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Clear Protection Event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Shutdown vs Protection Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Deleting a Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Triggered Setpoints. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Triggering Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Identification Query . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Section 4. Status Registers
Event Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Enable Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Transition Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
OPERation Status Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
REGulating Sub-Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
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SCPI Status Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Regulating Sub-Register Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Remote Control Sub-Register Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Questionable Status Register Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Section 5. Current Sharing
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Appendix A. GPIB
Codes and Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Message Terminators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Address Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Protocol Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Driver Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
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Appendix B. SCPI Command Reference
Codes and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
SCPI Command Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Using SCPI Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Notations Used in the Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Appendix C. Error Messages
CPU Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Auto Sequencing Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
CANbus Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Multichannel Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Appendix D. Calibration
Setup and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Output Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Exit calibration mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Restore Factory Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
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Table 1.1
Table 1.2
Table 1.3
Table 1.4
Table 1.5
Table 1.6
Table 2.1
Table 2.2
Table 2.3
Table 3.1
Table 3.2
Table 4.1
Table 4.2
Table 4.3
Table 4.4
Table 4.5
Table 4.6
Table 4.7
Table 4.8
Table 4.9
Table 4.10
Table 4.11
Table 4.12
Table A.1
Table A.2
Table B.1
Table B.2
Table B.3
Table B.4
Table B.5
Table B.6
Table B.7
Table B.8
Table B.9
Table B.10
Interface Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Commands for Fold Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Commands for Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
System Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Status Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
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List of Tables
Table B.11
Table B.12
Table B.13
Table B.14
Table B.15
Table C.1
Table C.2
Table C.3
Table C.4
Table C.5
Table C.6
Table C.7
Table C.8
Table C.9
Table C.10
Table C.11
Table C.12
Table C.13
Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Auto Sequencing Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
CANbus Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Multichannel Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Current Share Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
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Figure 2.1
Figure 2.2
Figure 2.3
Figure 2.4
Figure 2.5
Figure 2.6
Figure 2.7
Figure 2.8
Figure 2.9
Figure 2.13 Schematic For User Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 4.1
Figure 4.2
Figure 4.3
Figure 5.1
Operation Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Questionable Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
IEEE 488.2 Status Register and Status Byte. . . . . . . . . . . . . . . . . . . . 77
Example of Current Share Operation . . . . . . . . . . . . . . . . . . . . . . . . . 89
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List of Figures
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Section 1. Features and Specifications
Description
The internal GPIB-M interface card allows you to operate your power supply from
a computer controller via the IEEE-488 communications bus.
The GPIB-M interface allows complete remote programming of your power supply,
including status reporting, settings query, and service request generation with
user-designated conditions. Both the voltage and current output are precisely
programmed directly in volts and amps with 16-bit resolution. Additionally, the
16-bit readbacks measure the actual power supply output. The programming
command set is easy to use and includes software calibration commands. The
interface card comes with several protection features such as programmable over
and under voltage protection, and soft limits.
Multichannel addressing via CANbus allows up to 50 power supplies to be
controlled from one GPIB address. This manual covers operation of both the
GPIB-M and CAN-only interface cards.
Features and Functions
Features • 16-bit programming and readback of voltage and current
•
•
Programmable soft limits for voltage and current
LED status signals: remote operation, service request and shutdown; (XFR and
XHR only) error, addressed, over voltage protection, auxiliary status bits
•
•
•
•
•
•
•
Software calibration
Automatic voltage/current mode crossover
Shutdown or warning for over- and under-programmed trip points
Programmable auxiliary status lines for monitoring power supply conditions
Remote interlock and trigger lines
Selectable standby, programmed sequence and other power-on defaults
Active current sharing with parallel connected units for higher power
requirements
•
•
CANbus communications link for multichannel addressing, and master/slave
current sharing
Extensive SCPI command set for control and status monitoring
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Features and Specifications
Features and Functions
Programmable
Functions
•
•
•
•
•
•
•
Output voltage and current
Soft limits for voltage and current
Overvoltage protection
Output enable/disable
Ten, 99-step auto sequences for easy programming of complex test routines
Ten stored settings
Five load protection mechanisms including fold protection in CV or CC mode
Readback • Actual measured voltage and current
Functions
•
•
•
•
•
•
Voltage and current settings
Soft voltage and current limits
Overvoltage protection setting
Programming error codes
Power supply model and version identification
Firmware revision levels
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Features and Specifications
Specifications
Specifications
The specifications in this section are warranted at 25°C ±5°C unless otherwise
specified. All specifications are subject to change without notice.
Table 1.1 Specifications for HPD 300 W with GPIB-M or CANbus
Models
15-20
30-10
60-5
Program Resolution
Voltage
Current
2.4mV
2.8mA
4.7mV
1.4mA
9.3mV
0.7mA
Program Accuracy1
Voltage
60mV
±0.1%
75mA
±0.12%
70mV
±0.1%
50mA
±0.12%
90mV
±0.12%
25mA
±0.1%
Current
Readback Resolution
Voltage
Current
2.4mV
2.8mA
4.7mV
1.4mA
9.3mV
0.7mA
Readback Accuracy1
Voltage
45mV
±0.3%
75mA
±0.12%
90mV
±0.3%
40mA
±0.12%
175mV
±0.3%
25mA
±0.1%
Current
1. Apply accuracy specifications according to the following voltage program accuracy example:
Set a model HPD 15-20 power supply to 10 volts.
The expected result will be within the range of 10 volts ± 60mV ± 0.1% of the set voltage of
10 volts.
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Features and Specifications
Specifications
Table 1.2 Specifications for XFR 1200 W with GPIB-M or CANbus
Models
7.5-140
12-100
20-60
35-35
40-30
Program Resolution
Voltage
Current
1.16mV
19.6mA
1.8mV
14mA
3.08mV
8.4mA
5.4mV
5.4mA
6.2mV
4.2mA
Program Accuracy1
Voltage
10mV
50mV
75mV
75mV
±0.3%
200mA
±0.1%
75mV
±0.12%
500mA
±0.1%
±0.12%
460mA
±0.1%
±0.12%
250mA
±0.1%
±0.3%
150mA
±0.15%
Current
Readback Resolution
Voltage
Current
1.16mV
19.6mA
1.8mV
14mA
3.08mV
8.4mA
5.4mV
5.4mA
6.2mV
4.2mA
Readback Accuracy1
Voltage
30mV
60mV
75mV
75mV
±0.3%
200mA
±0.1%
75mV
±0.12%
500mA
±0.1%
±0.12%
460mA
±0.1%
±0.12%
250mA
±0.1%
±0.3%
150mA
±0.15%
Current
Models
60-20
100-12
150-8
300-4
600-2
Program Resolution
Voltage
Current
9.2mV
2.8mA
15.4mV
1.68mA
23.1mV
1.12mA
46.2mV
0.56mA
92.4mV
0.28mA
Program Accuracy1
Voltage
150mV
±0.25%
120mA
±0.1%
150mV
±0.35%
80mA
225mV
±0.35%
80mA
225mV
±0.35%
80mA
250mV
±0.35%
50mA
Current
±0.1%
±0.1%
±0.1%
±0.1%
Readback Resolution
Voltage
Current
9.2mV
2.8mA
15.4mV
1.68mA
23.1mV
1.12mA
46.2mV
0.56mA
92.4mV
0.28mA
Readback Accuracy1
Voltage
150mV
±0.25%
120mA
±0.1%
150mV
±0.35%
80mA
225mV
±0.35%
80mA
225mV
±0.35%
80mA
250mV
±0.35%
50mA
Current
±0.1%
±0.1%
±0.1%
±0.1%
1. Apply accuracy specifications according to the following voltage program accuracy example:
Set a model XFR 20-60 power supply to 10 volts.
The expected result will be within the range of 10 volts ± 75mV ± 0.12% of the set voltage of 10 volts.
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Features and Specifications
Specifications
Table 1.3 Specifications for XFR 2800 W with GPIB-M or CANbus
Models
7.5-300
12-220
20-130
33-85
40-70
Program Resolution
Voltage
Current
1.16mV
42.0mA
1.8mV
30.8mA
3.08mV
18.2mA
5.1mV
13.0mA
6.2mV
9.8mA
Program Accuracy1
Voltage
10mV
50mV
75mV
75mV
±0.3%
425mA
±0.1%
75mV
±0.12%
900mA
±0.1%
±0.12%
750mA
±0.1%
±0.12%
500mA
±0.1%
±0.3%
350mA
±0.15%
Current
Readback Resolution
Voltage
Current
1.16mV
42.0mA
1.8mV
30.8mA
3.08mV
18.2mA
5.1mV
13.0mA
6.2mV
9.8mA
Readback Accuracy
Voltage
30mV
60mV
75mV
75mV
±0.3%
425mA
±0.1%
75mV
±0.3%
350mA
±0.1%
±0.12%
900mA
±0.1%
±0.12%
750mA
±0.1%
±0.12%
500mA
±0.1%
Current
Models
60-46
100-28
150-18
300-9
600-4
Program Resolution
Voltage
Current
9.2mV
6.44mA
15.4mV
3.92mA
23.1mV
2.52mA
46.2mV
1.26mA
92.4mV
0.56mA
Program Accuracy1
Voltage
150mV
±0.25%
250mA
±0.1%
150mV
±0.35%
140mA
±0.1%
225mV
±0.35%
120mA
±0.1%
225mV
±0.35%
80mA
250mV
±0.35%
80mA
Current
±0.1%
±0.1%
Readback Resolution
Voltage
Current
9.2mV
6.44mA
15.4mV
3.92mA
23.1mV
2.52mA
46.2mV
1.26mA
92.4mV
0.56mA
Readback Accuracy1
Voltage
150mV
±0.25%
250mA
±0.1%
150mV
±0.35%
140mA
±0.15%
225mV
±0.35%
120mA
±0.1%
225mV
±0.35%
80mA
250mV
±0.35%
80mA
Current
±0.1%
±0.1%
1. Apply accuracy specifications according to the following voltage program accuracy example:
Set a model XFR 20-130 power supply to 10 volts.
The expected result will be within the range of 10 volts ± 75mV ± 0.12% of the set voltage of 10 volts
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Features and Specifications
Specifications
Table 1.4 Specifications for XHR 1000 W with GPIB-M or CANbus
Models
7.5-130
20-50
33-33
40-25
60-18
Program Resolution
Voltage
Current
1.16mV
42.0mA
1.8mV
30.8mA
3.08mV
18.2mA
6.2mV
9.8mA
9.2mV
6.44mA
Program Accuracy1
Voltage
10mV
50mV
75mV
75mV
±0.3%
350mA
±0.1%
150mV
±0.25%
250mA
±0.1%
±0.12%
900mA
±0.1%
±0.12%
750mA
±0.1%
±0.12%
500mA
±0.1%
Current
Readback Resolution
Voltage
Current
1.16mV
42.0mA
1.8mV
30.8mA
3.08mV
18.2mA
6.2mV
9.8mA
9.2mV
6.44mA
Readback Accuracy1
Voltage
30mV
60mV
75mV
75mV
±0.3%
350mA
±0.1%
150mV
±0.25%
250mA
±0.1%
±0.12%
900mA
±0.1%
±0.12%
750mA
±0.1%
±0.12%
500mA
±0.1%
Current
Models
100-10
150-7
300-3.5
600-1.7
Program Resolution
Voltage
Current
15.4mV
3.92mA
23.1mV
2.52mA
46.2mV
1.26mA
92.4mV
0.56mA
Program Accuracy1
Voltage
150mV
±0.35%
140mA
±0.15%
225mV
±0.35%
120mA
±0.1%
225mV
±0.35%
80mA
250mV
±0.35%
80mA
Current
±0.1%
±0.1%
Readback Resolution
Voltage
Current
15.4mV
3.92mA
23.1mV
2.52mA
46.2mV
1.26mA
92.4mV
0.56mA
Readback Accuracy1
Voltage
150mV
±0.35%
140mA
±0.15%
225mV
±0.35%
120mA
±0.1%
225mV
±0.35%
80mA
250mV
±0.35%
80mA
Current
±0.1%
±0.1%
1. Apply accuracy specifications according to the following voltage program accuracy example:
Set a model XHR 20-50 power supply to 10 volts.
The expected result will be within the range of 10 volts ± 50mV ± 0.12% of the set voltage of 10 volts.
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Features and Specifications
Specifications
Table 1.5 Specifications for XPD 500 W with GPIB-M or CANbus
Models
7.5-67
18-30
33-16
60-9
120-4.5
Program Resolution
Voltage
Current
1.2mV
5.2mA
4.6mV
3.6mA
5.1mV
2.9mA
9.3mV
1.3mA
18.6mV
0.7mA
Program Accuracy1
Voltage
10mV
75mV
75mV
150mV
±0.3%
80mA
180mV
±0.25%
80mA
±0.12%
250mA
±0.1%
±0.12%
140mA
±0.1%
±0.12%
115mA
±0.15%
Current
±0.15%
±0.1%
Readback Resolution
Voltage
Current
1.2mV
5.2mA
4.6mV
3.6mA
5.1mV
2.4mA
9.3mV
1.3mA
18.6mV
0.7mA
Readback Accuracy1
Voltage
30mV
75mV
75mV
150mV
±0.3%
80mA
180mV
±0.25%
80mA
±0.12%
250mA
±0.1%
±0.12%
140mA
±0.1%
±0.2%
115mA
±0.15%
Current
±0.15%
±0.1%
1. Apply accuracy specifications according to the following voltage program accuracy example:
Set a model XPD 18-30 power supply to 10 volts.
The expected result will be within the range of 10 volts ± 75mV ± 0.12% of the set voltage of 10 volts.
Table 1.6 Specifications for XT 60 W with GPIB-M or CANbus
Models
7-6
15-4
20-3
30-2
60-1
120-0.5
250-0.25
Program Resolution
Voltage
Current
1.1mV
1.0mA
2.4mV
0.6mA
3.1mV
0.5mA
4.7mV
0.3mA
9.3mV
0.2mA
17mV
0.1mA
17mV
0.1mA
Program Accuracy1
Voltage
10mV
20mV
±0.1%
70mA
±0.15%
20mV
±0.15%
50mA
30mV
±0.15%
40mA
200mV
±0.15%
26mA
400mV
±0.15%
13mA
400mV
±0.15%
13mA
±0.1%
110mA
±0.15%
Current
±0.15%
±0.15%
±0.2%
±0.2%
±0.2%
Readback Resolution
Voltage
Current
1.1mV
1.0mA
2.4mV
0.6mA
3.1mV
0.5mA
4.7mV
0.3mA
9.3mV
0.2mA
17mV
0.1mA
17mV
0.1mA
Readback Accuracy1
Voltage
10mV
10mV
±0.1%
70mA
±0.15%
10mV
±0.1%
50mA
±0.15%
15mV
±0.1%
40mA
±0.15%
35mV
±0.15%
26mA
±0.2%
70mV
±0.15%
13mA
±0.2%
70mV
±0.15%
13mA
±0.2%
±0.15%
110mA
±0.15%
Current
1. Apply accuracy specifications according to the following voltage program accuracy example:
Set a model XT 15-4 power supply to 10 volts.
The expected result will be within the range of 10 volts ± 20mV ± 0.1% of the set voltage of 10 volts.
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Features and Specifications
Specifications
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Section 2. Installation and Configuration
Introduction
To use this product, you must have the following equipment:
•
•
•
•
•
a compatible model of DC output power supply
IEEE-488 connector and cable
computer with an IEEE-488 interface card
Computer-based communications software package
parallel CANbus cables (to connect power supply for multichannel operation)
use in a previously-purchased supply already on site. The interface card will be
for your system using the “Basic Setup Procedure” on page 31. Refer also to
Figure 2.1, pg. 26, Figure 2.2, pg. 27 and Figure 2.3, pg. 27 for drawings of the front
panels. The interface subplate is different for each product. Please check Figure 2.4
to Figure 2.7.
Initial Inspection
CAUTION
!
If you remove the unit's cover, use proper static control techniques to avoid damage
to static-sensitive components on the printed circuit board.
On first receiving your unit, perform a quick inspection.
•
Ensure each package contains a power supply with its GPIB interface board
installed, and manuals for the power supply and the GPIB interface. A custom
CANbus cable and a terminator are also supplied with each GPIB-M or
CAN-only interface. Any additional parts shipped with the power supply will be
identified in the supply's documentation.
•
•
Inspect the unit for any signs of physical damage such as scratches, cracks, or
broken switches, connectors, or displays.
Check the printed circuit board and components if you suspect internal damage.
If the unit is damaged, save all packing materials and notify the carrier immediately.
For additional information, please see the section titled, “Returning Power Supplies
to the Manufacturer” in the manual shipped with your complete unit.
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Installation and Configuration
Initial Inspection
CAUTION
!
Use proper static control techniques to avoid damage to static-sensitive components
on the printed circuit board.
Remote LED (REM)
Local Switch (LOCAL)
Remote Programming LEDs:
Address LED (ADR)
Indicates that the master controller is addressing the unit.
Fault LED (FLT)
Used to indicate AUX B status is TRUE.
Service Request LED (SRQ)
Comes on at power up if the PON SRQ is set to on.
Polarity LED (POL)
Used to indicate AUX A status is TRUE.
Error LED (ERR)
Indicates when a programming error has occurred. You
can clear the ERR LED with an error query command.
Figure 2.1 XFR and XHR Power Supply Front Panel with GPIB-M Interface
(XFR 1200 Watt model shown)
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Installation and Configuration
Initial Inspection
Service Request LED (SRQ)
Remote LED (REM)
Shutdown LED (S/D)
Figure 2.2 XPD Power Supply Front Panel with GPIB Interface
Remote Mode (REM) LED
Service Request (SRQ) LED
Over Voltage Protection (OVP) LED
OVP Potentiometer
Figure 2.3 XT and HPD Power Supply Front Panel with GPIB Interface
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Installation and Configuration
Initial Inspection
GPIB
CANBUS
USER LINES
1
Figure 2.4 XFR 2800 Watt Power Supply Rear Panel with GPIB-M Interface
USER LINES
CANBUS
GPIB
1
Figure 2.5 XFR 1200 Watt Power Supply Rear Panel with GPIB-M Interface
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Installation and Configuration
Initial Inspection
USER LINES
CANBUS
GPIB
Figure 2.8 XT/HPD Power Supply Rear Panel with GPIB-M Interface
CAUTION
!
Use proper static control techniques to avoid damage to static-sensitive components
on the printed circuit board
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Installation and Configuration
Basic Setup Procedure
Basic Setup Procedure
This procedure can be used as a quick reference for those familiar with the
configuration requirements for the GPIB-M interface as installed in the DC power
supply.
IEEE-488 Controller Connection
Connect the GPIB cable to the supply at connector on the rear panel. Use an
approved IEEE-488 connector and cable when connecting the GPIB Interface to
your IEEE-488 GPIB network. Refer to Figure 2.4, Figure 2.5, Figure 2.6 or
Figure 2.7.
Add a ferrite block to reduce radiated emissions. The one inch square ferrite block
with built-in housing clip is packaged and shipped with the power supply interface
card.
To install the ferrite block:
user cable.
2. Open the ferrite block housing.
3. Run the cable through the ferrite block. See Figure 2.9, “XFR GPIB Cable with
Ferrite Block” on page 31.
4. Close the housing clip.
The ferrite block ensures that the power supply system meets radiated emission
requirements for CE mark.
GPIB Cable
Ferrite Block
To power supply
GPIB connector
To personal computer GPIB
connector
Figure 2.9 XFR GPIB Cable with Ferrite Block
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Installation and Configuration
Basic Setup Procedure
Setup For those who want more information, each step refers to more detailed procedures
located in subsequent sections.
Procedure
1. Power ON
Power on the unit.
2. Configure Computer Controller
Configure the controller to match the power supply characteristics. The unit is
shipped with default GPIB address 2. Configure your controller to talk to
address 2.
3. Test
Test the link by communicating with the power supply.
Example: Send the ID query “*IDN?” and ensure you get a response. Send the
command ":VOLT 2;:CURR 1" to set voltage to 2V and current limit to 1A.
(Using IBIC1 this would be ‘ibwrt ":volt 2;:curr 1"’)
See “Change Remote/Local Mode” on page 48 for information about changing
about Local/Remote modes.
If desired, configure the power supply with the desired power on settings or a
different GPIB address. (Be sure to change the controller address to match.)
See “Power On Remote State” on page 49, “Set Up Power ON Defaults” on page
56, and “Power On Output State” on page 57.
1. This text uses National Instruments' IBIC (Interface Bus Interactive Control) program commands
developed for their GPIB interface for computer controllers as examples only.
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Installation and Configuration
Basic Setup Procedure
Table 2.1 Remote Mode Power On Conditions
Feature
Factory Preset Value
0.0V
Voltage setpoint
Current setpoint
0.0A
Triggered voltage setpoint
Triggered current setpoint
Trigger source
Disabled (DEFault)
Disabled (DEFault)
None
Low voltage setpoint limit
High voltage setpoint limit
Low current setpoint limit
High current setpoint limit
Over voltage protection
Under voltage protection
Over current protection
Under current protection
Fold shutdown protection
0.0V
103% of voltage rating
0.0A
103% of current rating
Disabled (0.0V)
Disabled (0.0V) and not shutdown when tripped
Disabled (0.0A) and not shutdown when tripped
Disabled (0.0A) and not shutdown when tripped
None and delay 0.5s
AC OFF shutdown recovery Auto recover
OTP shutdown recovery
Aux line configuration
Latched
None and active low
CAUTION
!
Ensure the power supply chassis is properly connected to ground. The interface
connection system is not capable of handling the resulting excessive ground currents
that may flow through the connection to the controlling computer if the chassis is not
at ground potential.
Power On The Power On Service Request setting causes the power supply to send a service
request to the computer controller when the power supply is turned on or when it
Service
re-initializes after a momentary power interrupt if the following conditions are also
met:
Request
•
•
*PSC (power on status clear) is set to 0, and
bit 5 in the Service Request Enable register has been set (*ESE) prior to power
off.
When a service request is sent, the front panel SRQ LED will also turn on. You can
clear the service request and turn off the SRQ LED by performing a serial poll. See
also “Status Byte” on page 79 for information about the SRQ command.
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Installation and Configuration
Configure for GPIB Operation
Configure for GPIB Operation
The power supply is ready for GPIB communication when it leaves the factory, but
you may change any of the control settings. The default remote control setting is
GPIB, address 2.
Change Select an interface for remote control.
Remote
Control
SYST:REM:SOUR [GPIB|MCHannel]
Source
where
• GPIB: control via GPIB interface
• MCHannel:multichannel operation using the CANbus interface
Set GPIB Change the GPIB address.
Address
SYST:COMM:GPIB:ADDR <GPIB-address>
where
<GPIB-address> may be a value from 1 to 30.
Be sure to make a note of the GPIB address. If the address is unknown, use a feature
such as “Scan for Instruments” on National Instruments’ Measurement and
Automation Explorer.
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Installation and Configuration
Configure for Multichannel Operation
Configure for Multichannel Operation
Multichannel You may remotely control up to 50 power supplies from one GPIB interface by using
multichannel addressing via the CANbus.
Connections
One power supply will be connected to a PC via GPIB. All other power supplies are
connected via CANbus (Controller Area Network) to that unit. SCPI commands that
include a channel address will be sent via the CANbus to the other power supplies.
(Commands with the local address will be executed locally and will not be sent).
The multichannel address must be appended to the program mnemonic. If no
multichannel address is appended to the program mnemonic, the command is
executed by the local (directly connected) power supply.
Each unit of the network can send and receive commands to and from other units on
the network. It is highly recommended that only one command be sent at a time. Any
GPIB timeout settings should be increased when using multichannel commands.
Multichannel If a second power supply that has the same multichannel address as another is
connected to the bus, it will automatically increment its address until it finds a unique
address. If it fails to find a unique address, it will disconnect itself from the bus and
you will not be able to communicate with it until you disconnect the other power
supplies and cycle the power. Therefore, when configuring a network of supplies,
you can make all connections, and power on one supply at a time. They will
configure their addresses in the order that they were powered on. Be sure to note the
address of each power supply for future reference or in case you want to reorganize
the network.
Configuration
Example:
Connect 3 power supplies for multichannel operation. You have one GPIB-M supply
and 2 CAN-only supplies. The GPIB-M supply's multichannel address is set to 1 at
the factory. Both CAN-only supplies are set to 2.
Connect all units as described in “Basic Setup Procedure” on page 31.
Power on the GPIB-M supply, then one of the CAN-only supplies. Check that you
can communicate with both. Send the *IDN? query to return the identification string
from the GPIB-M supply. Send "SYST2:IDEN?"to return the ID string from the
CAN-only unit.
Power on the last unit. Since multichannel address 2 already exists on the bus, it will
automatically configure itself to address 3. Check that this is the case by sending the
command "SYST3:IDEN?"
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Installation and Configuration
Configure for Multichannel Operation
CANbus The CANbus port consists of two 4-pin modular “handset” jacks to support daisy
chain connections. The CAN (Controller Area Network) is an ISO standard
(ISO11898) for a serial communication network. Table 2.2 describes the pin
functions. The CANbus is used for communications in multichannel operation or
current sharing (master/slave) operation.
Table 2.2 CANbus Pins
Pin #
Function
CANLO
Ground
CANHI
1
2
3
4
Ground
CANbus The custom CANbus cables shipped with your unit are parallel 4-connector cables
with 4-pin modular “handset” connectors.
Cables
GPIB-M card. The CAN-only interface cards are set to multichannel address 2 at the
factory. Ensure the multichannel address on the GPIB-M is set to an unused address,
for example, address 1. Connect the two power supplies as shown in Figure 2.10,
“Connections for Multichannel Operation” on page 37.
of CAN-only
Interface
Cards
Send the query to the CAN-only power supply:
SYST2:REM:SOUR?
and ensure the response is “MCH” for multichannel.
If necessary, set the power supply to accept control via multichannel commands
(the CANbus interface) with the SCPI command:
SYST2:REM:SOUR MCH
Set each slave's unique multichannel address using the command:
SYST2:COMM:MCH:ADDR <multichannel-address>
where multichannel-address is an integer in the range of 1-50.
This procedure can be repeated separately with each power supply to assign a unique
address to each. Once all power supplies are configured, they can be connected to the
CANbus network.
Note See “Broadcasting Commands” on page 39 for additional information on
configuring CAN-only units.
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Installation and Configuration
Configure for Multichannel Operation
Setup See Figure 2.10.
1. Connect power supplies to be controlled via the CANbus network. Connect the
power supplies in a daisy chain by linking the first power supply to the second
using one cable, and then the second to the third using a second cable and the
second CAN port. Continue making connections in this fashion until all the
power supplies are connected. Terminate the bus at both ends, using the unused
CAN ports, with 120 ohm, 1/4 Watt resistors (included) across the CAN HI and
CAN LO signals (Pins 1 and 3). See Table 2.2, “CANbus Pins,” on page 36.
2. At least one power supply must be connected to a PC via GPIB for multichannel
functionality. Configure each of the power supplies with a unique address, as
described in the configuration section. Addresses may be in the range 1 to 50
inclusive. Record the address of each unit for future reference.
3. Turn the power supplies on one at a time.
GPIB
Connection
Figure 2.10Connections for Multichannel Operation
Using Once the power supplies have been configured and connected, you may power them
on.
Multichannel
Operation
Power supplies controlled via multichannel have full capabilities, including
changing REM/LCL modes and calibration.
Any power supply may send multichannel commands, if they are connected to a PC
via GPIB.
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Installation and Configuration
Configure for Multichannel Operation
A power supply will attempt to connect to the network:
•
•
on power up, and
when the multichannel address is changed.
The power supply will successfully connect if there are no other power supplies on
the network with the same address.
Error 1702, “Multichannel address taken”is queued if the power
supply fails to connect.
SCPI Remote Control (RCONtrol) subregister will indicate the status of the
connection. A power supply that has been disabled will not have any bits set. Use the
SCPI command:
STAT:OPER:RCON:COND?
to query the condition of the multichannel interface.
See Table 4.5, “Remote CONtrol Sub-Register,” on page 74 for a description of the
bits in this register.
Multichannel To send a command to a multichannel power supply, attach the channel address to
the command. If no channel number is specified, the command will be executed by
the directly connected power supply.
Commands
For example, the command:
will set the power supply with address 12 to 10V output. The master receives the
command and puts in on the CANbus.
Appendix B. “SCPI Command Reference” lists all commands.
[<channel>]indicates where the multichannel address is to be inserted into the
command.
IEEE488.2 commands have been given an alias that is SCPI compliant if the
command is applicable to a power supply in multichannel operation. These
commands include *CLS, *IDN?, *OPT?, *RST, *TST?, *RCL, *SAV, *SDS, and
*WAI. See Table B.1, “IEEE 488.2 Commands,” on page 104.
Note The multichannel interface can not handle multiline response messages.
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Installation and Configuration
Configure for Multichannel Operation
Broadcasting You can specify a channel address of "0" to broadcast a command to all power
supplies connect via CANbus. Broadcast commands are useful in set up and
operation.
Commands
Example:
Set all power supplies to remote mode:
SYST0:REM:STAT REM
Turn output on:
OUTP0 ON
Set voltage output to maximum:
SOUR0:VOLT MAX
Attempting to broadcast any query will generate an error.
Note Broadcasting may be useful in configuring a CAN-only power supply when its
address is unknown. Connect the unit to a GPIB-M power supply. Broadcast the set
multichannel command to change the CAN-only supply's address. The command has
no effect on the GPIB controlled unit.
Example: "SYST0:COMM:MCH:ADDR 2"will set the CAN-only unit to address 2.
Note that there will be a lag in execution time between the local unit and all other
units of up to a maximum of 20 ms.
Specifications
Max connected units 50
Max cable length
Bus speed
40 m
700 kbits/sec
Termination
Connectors
Addresses
120 ohm 1/4 W
modular handset 4-position, 4-contact jacks
1 to 50
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Installation and Configuration
User Lines
User Lines
dependent on the operator's design and uses. The operation of the auxiliary status
lines requires that you provide external Vcc and ground. To locate the connector,
refer to Figure 2.4, Figure 2.5, Figure 2.6 and Figure 2.7. See Figure 2.13,
“Schematic For User Line Interface” on page 42 and Table 2.3, “User Line Pins,” on
page 40 for pin descriptions.
The user lines are optically isolated, open collector configuration. The input lines are
capable of sinking 10mA (with recommended 5V at input) up to a maximum of
90mA.
XT/HPD and XPD: The connector for the user lines is a standard 8-conductor RJ45
jack. The cable is supplied by the user.
XFR or XHR: The connectors are removable “wire clamp” terminal block style
connectors. Use shielded twisted pairs of 22-24 AWG wire for connections. Strip
0.2” (5mm) of insulation from the wires and clamp securely at the appropriate pin.
Table 2.3 User Line Pins
Pin # Function
Input/Output
Output
Output
Input
1
2
3
4
5
6
7
Aux Status Line A
Aux Status Line B
External Trigger 4-12V
Safety Interlock (Shutdown) 4-12V
Safety Interlock (Shutdown) GND)
User Power, 5-12Vdc
Input
Input
Input
User Ground
Input
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Installation and Configuration
User Lines
User Lines
Connection
(XT, HPD,
XPD)
Figure 2.11User Signals Connector (XT, HPD and XPD)
Use a standard 8-connector RJ45 connector and data cable to connect to the user
lines.
Add a ferrite block to reduce radiated emission. The one inch square ferrite block
with built-in housing clip is packaged and shipped with the power supply interface
card.
To install the ferrite block:
1. Position the block no more than 5 cm (2 in.) from the power supply end of the
user cable.
2. Open the ferrite block housing.
3. Loop the cable through the ferrite block. See Figure 2.12, “XT, HPD, XPD User
Cable with Ferrite Block” on page 41.
4. Close the housing clip.
The ferrite block ensures that the power supply system meets radiated emission
requirements for CE mark.
J7 User Cable
Ferrite Block
To J7 Connector
To User Custom Interface
Figure 2.12XT, HPD, XPD User Cable with Ferrite Block
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Installation and Configuration
User Lines
CHASSIS POTENTIAL
ISOLATED USER LINES
CNY17-2
USER LINES
CNY17-2
508 Ohm
0.4W
CNY17-2
508 Ohm
0.4W
CNY17-2
Vf = 1.3V TYP, 1.5V MAX
If = 10mA Recommended, 90mA MAX
Figure 2.13Schematic For User Line Interface
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Section 3. Operation
Overview
Once you have installed the power supply and connected both the AC input power
and the load as explained in Section 2, the power supply is in its default
configuration and is ready for operation.
One power supply must be connected via GPIB. Additional units may be controlled
via the CANbus port which enables multichannel addressing. The multichannel
addressing also supports the current sharing feature for parallel-connected units. Any
unit may be toggled between remote and local control modes.
Section 3 provides information about operating the power supply remotely via the
GPIB-M or CAN-only optional interface.
In addition, brief descriptions are provided of Constant Voltage and Constant Current
modes. See “Power Supply Operation” on page 48.
Powering ON
the Power
Supply
WARNING- Shock Hazard
The factory setting for Power ON is 0V and 0A with the output OFF. These settings
can be customized by end users. If you suspect that the power supply has been used
by someone else since it was received from the factory, be prepared for the unit to
power ON with a live DC output.
To power on the power supply:
1. Ensure that the AC power switch is OFF.
2. Connect the unit to an AC outlet.
3. Turn on the front panel AC power switch.
After a short power-on delay, the digital meters on the front panel and the CV LED
illuminate.
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Operation
Power Supply Operating States
Power Supply Operating States
The power supply has 5 operating states:
Power-On
Output Shutdown
•
•
•
•
•
Soft Start
Normal Operation
Calibration
Power-On This is the period between the time that AC power is applied to the supply (AC
breaker turned on) and the time that the power supply is ready for operation. During
this period, the internal circuits are powering up and performing self-tests. At the end
of the Power-On period, the supply is normally in its default Power-On mode with
the output OFF, VSET=0 and ISET=0.
Output In this state, the output is disabled and there is no output regardless of power settings.
The power supply can be placed in the Output Shutdown state by a command (or the
the front panel - XFR, XHR only), via the Interlock signal, or from a protection
mechanism. This is also called the Standby mode.
Shutdown
Soft Start In this state, the output power is ramping up gradually towards its target load. This
reduces equipment stress. This state occurs whenever the supply output is enabled
by the software (a command or a protection is cleared), and is approximately 2
seconds in duration. See “Slew Rate” on page 67 to change the properties of the
ramp.
Normal This is the normal operating state for the power supply. The power supply is ready
to accept commands.
Operation
Calibration This is a service mode that is used to calibrate setpoints and readback levels for
accuracy. Calibration should only be performed by qualified service personnel.
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Operation
Power Supply Regulation Modes
Power Supply Regulation Modes
The power supply has 2 regulation modes while in the Normal Operation State:
•
•
Constant Voltage (CV)
Constant Current (CC)
The CV, CC LEDs on the front panel indicate the regulation mode.
Constant In this mode, the supply’s output voltage is constant while the current and power
vary with the load. The power supply will operate in constant voltage mode
Voltage (CV)
whenever the load current IL is less than the current limit setting ISET, or: IL<ISET
(IL=VSET/RL). In constant voltage mode, the power supply maintains the output
voltage at the selected value (VSET) while the load current IL varies with the load
requirements.
.
Constant In this mode, the supply’s output current is constant while the voltage and power
vary with the load. The power supply will operate in constant current mode
whenever the load resistance is low enough that the load current IL is equal to the
current limit setting ISET. (VL=ISETRL). In constant current mode, the power supply
maintains the output current at the selected value (ISET) while the load voltage VL
varies with the load requirements.
Current (CC)
Automatic This feature allows the power supply to automatically switch operating modes in
response to changing load requirements. If, for example, the power supply was
operating in Constant Voltage (CV) Mode (IL < ISET), and the load changed so the
load current (IL) became EQUAL TO the current limit setting (ISET), the power
supply would automatically switch into Constant Current (CC) Mode and the output
voltage would vary in response to changes in load current. If the additional load was
subsequently removed so the load current was again LESS THAN the current limit
setting, the supply would automatically return to Constant Voltage (CV) Mode.
Mode
Crossover
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Operation
Remote Control Modes
Remote Control Modes
The power supply must be in remote mode to execute commands. The remote mode
is indicated by the front panel remote status LED. A power supply will respond to
GPIB equipped supplies will automatically transition from local to remote mode when
any command data is received. CANbus-only supplies may have to be put into remote
mode with a command before sending any other command. See “Change
Remote/Local Mode” on page 48.
The factory default power-on settings are given in Table 3.1, on page 46.
Table 3.1 Power Supply Factory Defaults
Default Output State
(Shutdown)
Power Supply
Default Remote State
XFR or XHR
XPD
Remote
Local
OFF
ON
XT or HPD
Local
ON
You can change the default Remote/Local state, see “Power On Remote State” on page
49.
If safety is an issue because the front panel control knobs may be set to hazardous
voltages at power on, contact the factory to order locking bushings for the knobs.
See your power supply’s operating manual for details on using the power supply in
local mode.
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Operation
Front Panel LEDs
Front Panel LEDs
The status LEDs on the front panel give an instant indication to the status of the
power supply.
LED
REM
SRQ
S/D
Description
Unit is operating under remote control. Remote settings apply.
Unit is requesting service
Unit is in shutdown due to tripped protection mechanism,
command, or interlock
In addition, the XFR and XHR series power supplies have the following additional
indicators.
LED
ERR
ADR
OVP
OTP
ACF
Description
Unit has encountered an error
Unit is receiving a command
Unit is shutdown due to a hardware over-voltage condition.
Unit is shutdown due to an over-temperature condition.
Unit is shutdown due to an AC input failure condition (AC line may
be high or low.)
POL
FLT
Used to indicate the AUX A status condition is true.
Used to indicate the AUX B status condition is true.
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Operation
Power Supply Operation
This section describes how to configure and operate the power supply.
For a complete list of commands and remote functionality, see Appendix B. “SCPI
Command Reference”. Read “Understanding SCPI Commands” on page 99 for a
better understanding of SCPI commands.
Almost every command setting can be queried to return the current setting. The
query is given by appending a “?” to the command header (the command, minus any
parameters).
Change A SCPI command is provided to change the remote/local mode. (GPIB can also use
IEEE 488-1 functions to change modes.)
SYST:REM:STAT {LOC|REM|RWL}
Where:
Remote/Local
Mode
•
•
•
LOC: go to local mode operation
REM: go to remote mode operation
RWL: remote with local lockout. Go to remote mode operation with local mode
locked out. With RWL set, the user cannot return to local mode via the front
panel. RWL is only valid for XFR/XHR series power supplies. Local lockout
will not allow the user to return the power supply to local operation using the
front panel LOCAL button.
To query to remote mode:
SYST:REM:STAT?
XFR and XHR series power supplies have a LOCAL key that allows you to shift
control to local mode except if the power supply has Local Lockout (LLO) active.
Changing the remote/local state:
When entering local mode, the option card will clear all protections and re-enable the
bridge since software protections cannot be cleared at the front panel. When
returning to remote, the command shutdown will be reasserted if it was set when the
unit was last in remote mode.
Software protection settings and configurations (over voltage, under voltage, over
current and under current levels, and AC Fail, over temperature and fold
configurations) are ignored while in local mode.
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Operation
Power Supply Operation
The functionality of the hardware protection circuits (OVP, OTP, ACFail) remains
the same in local mode.
WARNING
When returning to remote mode, the remote protection setpoints may trip even
though the remote setpoints would not normally cause the unit to shutdown. This
is because the output transient in settling to the remote settings from the local
settings may cause a trip condition. Once cleared, the unit will operate normally.
Note: There will be no status reporting of OVP, interlock, sense, OT or AC protections
while the unit is in local mode since software protections cannot be cleared at the front
panel.
Power On (XFR/XHR and XPD only) You may set whether the power supply powers on in
remote or local mode
Remote State
SYST:REM:PON:STAT <on-off-state>
Enable When the output is disabled, the S/D LED on the front panel will be lit and a bit in
the shutdown register will be set.
Output
To enable or disable the output:
OUTP[<channel>] {ON|OFF|0|1}
Setting the output state to "ON" will attempt to clear all shutdown bits (except the
interlock). Previously, it only cleared a shutdown caused by a command (i.e. "OUTP
OFF").
To query the state of the output enable:
OUTP?
The output state query returns "0" if the output is disabled for any reason (e.g.
protection tripped or command shutdown) and "1" only if the output is enabled.
Set Voltage SOUR:VOLT <voltage>
SOUR:CURR <current>
and Current
To check your settings:
SOUR:VOLT?
SOUR:CURR?
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Operation
Power Supply Operation
Readback To check the voltage or current output of the power supply, use the commands:
MEAS:VOLT?
MEAS:CURR?
Units are in volts and amps, respectively.
Example:
To set voltage to 5.5V and current limit to 100A, send the command:
:VOLT 5.5; :CURR 100
Then check the output:
MEAS:VOLT?5.500 (example readback, default unit V)
MEAS:CURR?0.010 (example readback, default unit A)
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Operation
Power Supply Operation
Configure Five configurable protection mechanisms are available:
Output
Protection
•
•
•
•
•
OVP: Over-Voltage Protection. Factory default = 0V (disabled)
UVP: Under-Voltage Protection. Factory default = 0V (disabled)
OCP: Over-Current Protection. Factory default = 0A (disabled)
UCP: Under-Current Protection. Factory default = 0W (disabled)
Fold: Fold Protection. (See below.)
OVP shuts down the power supply if the protection limit is exceeded. The other
options offer a choice: they shut down the power supply or issue a warning by setting
a bit in the status register. Set the protection mechanism to ON to enable it to
shutdown the power supply.
When the protection level is set to zero, that mechanism is disabled. However, in the
case of OVP, a fixed hardware protection mechanism still exists to protect the supply
from damage.
To set the over-voltage protection level:
SOUR:VOLT:PROT <voltage>
To set the under-voltage protection level:
SOUR:VOLT:PROT:UND <voltage>
To enable UVP shutdown:
SOUR:VOLT:PROT:UND:STAT <on-off-state>
To set the over-current protection level:
SOUR:CURR:PROT <current>
To enable OCP shutdown:
SOUR:CURR:PROT:STAT <on-off-state>
To set the under-current protection level:
SOUR:CURR:PROT:UND <current>
To enable UCP shutdown:
SOUR:CURR:PROT:UND:STAT <on-off-state>
To check if a protection mechanism was tripped:
SOUR:VOLT:PROT:OVER:TRIP?
SOUR:CURR:PROT:OVER:TRIP?
SOUR:CURR:PROT:UND:TRIP?
Alternatively, you can query the status register. See Appendix B. “SCPI Command
Reference”.
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Operation
Power Supply Operation
OVP The over voltage protection level is set with a command for remote mode and with
the front panel potentiometer for local mode. If operating in remote mode, and the
OVP is disabled by setting the trip level to 0, a second hardware OVP circuit, fixed
at approximately 115%, may trip and shutdown the unit. If this occurs, either
shutdown the unit, or toggle the output with a command, the interlock or front panel
S/D button to clear the OVP circuit.
OVP operation will remain the same for local mode. Specifically, it will be
controlled via the front panel potentiometer. The OVP LED will indicate if OVP has
been tripped. Either pressing the S/D button, or asserting the interlock will clear the
OVP condition and the unit resumes normal operation when the respective signal is
removed.
Fold Fold Mode protection will shut the power supply down when the unit enters the
selected regulation mode for a specified period of time.
Protection
A programmable delay time causes the supply to wait before shutting down the
output.
To set the fold mode:
OUTP:PROT:FOLD {CC|CV|NONE}
Where:
•
•
•
NONE indicates fold protection is disabled.
CC indicates the supply will shut down due to constant current condition.
CV indicates the supply will shut down due to constant voltage.
The default value is NONE.
To set the fold delay:
OUTP:PROT:FOLD:DEL <delay_time>
Where:
<delay_time>is a value in the range of 0–60 seconds.
Units may be specified as “ms” (milliseconds) “s” (seconds), or “min” (minutes). If
no units are specified, the default seconds are assumed. (Increments of 0.1s are
allowed.) The default value is 0.5 second.
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Operation
Power Supply Operation
Additional Other protection mechanisms designed to protect the power supply are:
Protections
•
•
AC Off: Disables the output if the AC line drops below the acceptable range.
Sense Protection: Disables the output when the internal sense circuit is tripped
by either reversed polarity at the output of the supply or a high voltage present
at the output.
•
Output Fail: Disables the output if the bridge circuit fails. This is a hardware
protection circuit and has no associated software controls.
Set There are two options for AC Off (ACO) and Over-Temperature protection (OTP):
Shutdown
Recovery for
AC Off
•
Auto-Recovery: With this method, the power supply returns to its normal
operating state once the alarm condition no longer exists. For example, if there
was an over-temperature alarm and the protection was set to auto-recovery, the
power supply would return to its normal operating state once the temperature
was reduced below the alarm level.
•
Latched: With this method, the power supply remains in Shutdown state until
the operator manually clears the protection and manually turns the output back
on.
AC Off The user has the option of setting whether the AC Off protection mechanism is
latched or automatically resumes operation.
SENSe:VOLT:AC:PROT:LATCH {ON|1|OFF|0}
Where:
Protection
• ONor 1means the supply will be latched in shut down if an AC Off condition
occurs, until the user re-enables the output, and
• OFFor 0means the supply will automatically resume operation when the AC
line input returns to normal.
The default value is OFF.
To query if AC Off has tripped:
SENSE:VOLT:AC:PROT:TRIP?
Over The user has the option of setting whether the OTP mechanism is latched or
automatically resumes operation.
SENSe:TEMP:PROT:LATCH {ON|1|OFF|0}
The default value is ON.
Temperature
Protection
To query if OTP has tripped:
SENSE:TEMP:PROT:TRIP?
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Operation
Power Supply Operation
Clear If the unit has shut down, resume operation by sending the "OUTP ON" command.
Protection
To support older revisions of firmware (1.5 and older),
[:]OUTPut[<channel>]:PROTection:CLEar command will still be
parsed and passed to other instruments on the CANbus.
Event
WARNING- Fire Hazard
If an over-voltage or over-current protection error persists without apparent cause,
disable the output, and turn the AC switch OFF. Inspect the load and power supply
for evidence of an electrical fault. The power supply should not be brought back into
operation if there is any evidence of an electrical fire or other safety hazards.
Shutdown vs If a protection setpoint is exceeded, the system does the following:
Protection
Alarm
(OVP does not have a settable :STATe. It is always ON.)
2. If :STATe has been set to OFF, the unit does not shut down but creates an alarm
by setting the appropriate bit in the questionable status register, which can be
queried remotely. See “Status Registers” on page 69 for more information.
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Operation
Power Supply Operation
User Settings If you have a frequent or constant need for a specific voltage and current output, you
can save these setpoints in the power supply’s memory as a user setting. Once a
setting is stored, it remains in the power supply’s memory after the unit is powered
off.
(Save and
Recall)
Ten user setting memory locations are available, and each saves the following
parameters:
•
•
•
•
•
•
•
•
•
•
•
•
Voltage setpoint
Current setpoint
Over-voltage protection setpoint (OVP)
Under-voltage protection setpoint and shutdown configuration (UVP)
Over-current protection setpoint and shutdown configuration (OCP)
Under-current protection setpoint and shutdown configuration (UCP)
Foldback protection mode and delay settings
AC Off auto recovery configuration (ACO)
OTP auto-recovery configuration
Aux line configuration
Voltage and current soft limits
Triggered setpoints and trigger source
Note All parameters are saved and used when the user setting is recalled. Therefore, you
should set parameters that you do not care about to the factory defaults.
To store (save) settings:
*SAV <user-setting>
or the SCPI equivalent for multichannel addressed units
SYST<channel>:SAVE <user-setting>
where <user-setting> is an integer from 1 to 10.
Example:
*SAV 1 will save all the present settings to user setting location 1.
To recall settings:
*RCL <user-setting>
To save default settings:
*SDS <user-setting>
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Operation
Power Supply Operation
This will save factory default settings to a user setting location, replacing any setting
that was previously saved there.
Example:
To save settings, set up the power supply with all required settings (we recommend
that you do this right after recalling the factory default settings).
For example, you can set voltage, current, and all protection levels.
Then to save the settings to Location 1: issue the command *SAV 1
When you want to recall the settings, issue the command *RCL 1. If you want to
recall them at the next power on, issue the command OUTP:PON:REC USER1
To change a stored setting, overwrite it with a new setting.
Set Up Power You can change the power supply to power on with setpoints other than the factory
defaults.
ON Defaults
Use the command:
OUTP:PON:RECall [PRESet|USER <user-setting>|ASEQ
<sequence-number>]
where the 4 options are:
•
•
PRESet: The output is reset to the original factory levels at power on. (default)
USER <user-setting>: The output is set to a custom setting recalled from
memory. This assumes that at least one user setting has been set up and stored in
memory. See “User Settings (Save and Recall)” on page 55.
•
ASEQ <sequence-number>: Recall a stored program. A RUN command must
be issued to start running the program. This assumes that at least one program
has been created and stored in memory. See “Auto Sequencing” on page 60 for
information about remotely programming and running auto sequence programs.
Example:
To power on user setting #1:
OUTP:PON:REC USER1
The user setting must be in the range of 1–10. See “User Settings (Save and Recall)”
on page 55 for an explanation of how to save user settings.
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Operation
Power Supply Operation
Power On (XFR/XHR only) You may also change the output state whether the output is enabled
or disabled at power on.
Output State
To change the power on at output state:
OUTP:PON:STAT [ON|OFF|1|0]
power off and this setting.
Reset Resetting the unit puts certain features to a known state. These states are listed in
Table 3.2.
To reset the unit:
*RST or SYST:RES
Table 3.2 Features Affected by Reset (*RST) Command
Feature
Reset State (*RST)
Voltage setpoint
Current setpoint
Low voltage setpoint limit
0.0V
0.0A
0.0V
High voltage setpoint limit 101% of voltage rating
Low current setpoint limit 0.0A
High current setpoint limit 101% of current rating
Over voltage protection
Under voltage protection
Over current protection
Under current protection
Fold shutdown protection
Disabled (0.0V)
Disabled (0.0V) and not shutdown when tripped
Disabled (0.0A) and not shutdown when tripped
Disabled (0.0A) and not shutdown when tripped
None and delay 0.5s
AC off shutdown recovery Auto recover
OTP shutdown recovery Latched
Triggered voltage setpoint Disabled (Default)
Triggered current setpoint Disabled (Default)
Autosequence mode
Calibration mode
Output
Exit
False
Disabled
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Operation
Power Supply Operation
Read Error The error queue holds up to 50 error messages. Once each message has been read, it
is cleared from the system.
Messages
To read from the error queue:
SYST:ERR?
This command returns an error code and message from the error queue. For example:
• -100, “Command error”
• 0, “No error”
See Appendix C. “Error Messages” for descriptions of the messages.
Clear Status Issue a Clear Status command to clear all error messages and status registers.
*CLS
or
STATus<channel>:CLEar
Configure The Auxiliary (Aux) lines are 2 open collector outputs that can be used to monitor
the status of the power supply. The auxiliary lines are referred to as AUX A and AUX
B. The auxiliary status lines can be set up to report the following status conditions:
Auxiliary
Status Lines
•
•
•
•
•
•
•
•
•
•
•
•
•
•
NONE
ON: Output On
OFF: Output Off
OVOLtage: Over-Voltage Condition
UVOLtage: Under-Voltage Condition
OCURrent: Over-Current Condition
UCURrent: Under-Current Condition
FOLD: Fold Protection Tripped
CC: Constant Current Mode
CV: Constant Voltage Mode
UNRegulated: Output Unregulated
OTEMperature: Over Temperature Protection Tripper
ACOFf: AC Protection Tripped
SPRotection: Sense Protection Tripper
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Operation
Power Supply Operation
To set up Auxiliary line A:
OUTP:AUXA:SOUR <aux-line-mnemonic>
To set up Auxiliary line B:
OUTP:AUXB:SOUR <aux-line-mnemonic>
The choices for <aux-line-mnemonic> are listed above.
To check the state of the line:
OUTP:AUXA:STAT?
OUTP:AUXB:STAT?
This command returns a 1 or 0. If it returns a 1, this means that the status selected as
the auxiliary line mnemonic is true.
The XFR and XHR series power supplies use the polarity (POL) LED and fault
(FTL) LED to indicate is the AUX A and AUX B status conditions are true.
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Operation
Auto Sequencing
Auto Sequencing
Auto Sequencing allows users to program a sequence for automated operation. Up
to 10 programmable sequences may be stored with up to 99 steps per sequence. Each
step can be programmed to set the voltage setpoint, current setpoint, and OVP level.
The steps are either programmed to run for a specific length of time or are
programmed to pause and wait for a trigger input before continuing. The duration of
each step may range from 10 ms to 99 hours.
Each sequence can be programmed to run a set number of repetitions or indefinitely.
If the sequence contains steps that advance by a trigger event, a single trigger source
can be selected to advance those steps.
CAUTION
!
Setpoint limits do not apply to auto sequence programmed setpoints.
Users can select and start a sequence, and while the sequence is running, pause or
end it at any time. Users can also skip to the next step at any time.
Commands are also available to let users run, pause, resume, and restart an
autosequence. A pause, or wait for trigger, causes the power supply to hold the
output at the programmed level until the appropriate signal to continue is received.
Programming Select Sequence to Program
a Sequence
Using the following command, select a sequence that you want to work with.
Sequences are identified with a number from 1 to 10.
PROGram:NAME <sequence_number>
<sequence_number>is a number between 1 and 10 that corresponds to the
number of the sequence.
If <sequence_number>already exists, then that existing program is selected. If
the program name does not exist, then the new name is selected, but no program is
defined by this selection.
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Operation
Auto Sequencing
Editing the Sequence
To edit an existing step or to program new steps, use the following commands:
PROG:STEP<step_number>[:EDIT] [[[[<voltage>]
,<current>],<OVP_level>],{<time>|TRIG}]
Any of the step parameters may be omitted, in which case the default parameters will
be used. The default values for a step are 0 V, 0 A, 0 V, 10 ms.
Example:
PROG:STEP1 10,10
PROG:STEP2 20,20,,20
will program step 1 to be 10V, 10A, OVP disabled (0V) and 10ms in duration and
step 2 to be 20V, 20A, OVP disabled and 20 seconds in duration.
To insert a step between commands in an existing program, use this command:
PROG:STEP<step_number>:INS [[[[<voltage>]
,<current>],<OVP_level>],{<time>|TRIG}]
The step number is where the inserted step is to be located. The existing step and all
following steps at that location are moved down.
In both the edit and insert commands:
• <step_number>ranges from 1 to 99.
• <time> defines the duration of the step and may be given in the following
fomats:
hh:mm:ss.s
mm:ss.s
hours/minutes/seconds
minutes/seconds
<floating point number>H hours
<floating point number>M minutes
<floating point number>S seconds
<floating point number>
seconds
Ranges from 10ms to 99 hours.
• TRIG may be entered instead of a step duration. In this case, the unit will hold
the output levels at that step until a trigger signal is supplied.
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Operation
Auto Sequencing
Setting Sequence Repetitions
Set the number of times a sequence will repeat before stopping execution.
PROG:REP {ONCE |<sequence_count>|FOR|INF}
•
ONCE will run the sequence once and return it to its STOP condition.
• <sequence_count>ranges from 1 to 9999. It will run the sequence the
number of times specified before putting it into the STOP condition.
•
FORever and INFinity cause the sequence to repeat forever. A query will return
9.9E37, representing INFinity.
Selecting a Trigger Source
If any triggers are programmed into the sequence, select a trigger source:
PROG:TRIG:SOUR {BUS|MAN|EXT|IMM}
• BUS- trigger signal is IEEE 488.1 GET or *TRG
• MANual- trigger input is from the front panel TRIGGER key
• EXTernal- The external trigger line is selected as the source.
• IMMediate- The source is the SCPI command “INIT:IMM”
Editing Step Parameters
Commands are provided to edit only one of voltage setpoint, current setpoint, OVP
level, step duration, or end action.
•
•
•
Program step voltage: PROG:STEP<step_number>:VOLT <voltage>
Program step current: PROG:STEP<step_number>:CURR <current>
Program step OVP level: PROG:STEP<step_number>:OVP
<OVPlevel>
•
Program step time (duration): PROG:STEP<step_number>:DWEL
{<time>|TRIG}
Deleting Steps
To delete any step from the sequence:
PROGram:STEP<step_number>:DELete
Subsequent steps are shift up.
Note The default value for a sequence’s repeat time and trigger source is repeat once and
trigger from key. See “Setting Sequence Repetitions” on page 62 and “Using Auto
Sequencing” on page 63 for an explanation of how to edit these values.
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Operation
Auto Sequencing
Querying the number of steps
To query the number of steps that have been programmed:
PROGram:STEP:COUNt?
Deleting a Deleting Sequences
Sequence
If you no longer need a sequence, select it with the PROG:NAMEcommand and then
delete it with the following:
PROGram:DELete
You can also use the following to delete all sequences:
PROGram:DELete:ALL
Using Auto Auto Sequence programs can be set to run as a Power ON default or recalled from
memory.
Sequencing
Auto sequence programs can operate 3 different ways:
•
They can run automatically through a series of steps, repeating those steps a
pre-set number of times if necessary, and complete their operation without
intervention from an operator.
•
They can run automatically and be paused. If you need to stop the program
temporarily, change its state to “PAUSE” to stop it, and then change the
program’s state to “RUN” to resume the program’s operation when ready. The
output remains on and voltage may be present at the output.
•
They can run automatically programmed to wait for a trigger at certain points in
the sequence. If you want the program to resume, you can supply a trigger signal
to the rear panel Trigger input.
Select Sequence to Run
To run an auto sequence program, first select the program you wish to run:
PROGram:NAME <sequence_number>
where <sequence_number> can range from 1 to 10.
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Operation
Auto Sequencing
Operation
To run, stop or pause a sequence, use the following command:
PROGram:STATe [RUN|PAUSe|STOP]
•
Once the programmed sequence has been selected, you can start it by setting the
state to RUN, by sending the command PROG:STAT RUN.
•
At any time you can pause the sequence by sending PROG:STAT PAUS.
A paused sequence will cause the supply to hold the output levels at the setpoints
programmed by the current step. To resume, set the state to RUN again.
•
•
To end the sequence operation, send the command PROG:STAT STOP.
Sending RUN will restart the auto sequence program from the first step.
You can query the state of the selected auto sequence program with
PROG:STAT?
Trigger
If the auto sequence was programmed to wait for a trigger, the power supply holds
the output levels at the programmed setpoints until a trigger is received. It then
advances to the next step. A trigger must come from the selected trigger source,
which may be the GPIB bus, a SCPI command or the user lines.
Skipping a Step
To advance the sequence to the next step, send the command:
PROGram:STEP:NEXT
Querying Operation
You can query the step number that is currently operating:
PROGram:STEP:EXEC?
You can also query the number of times the sequence has executed:
PROGram:REP:EXEC?
Exiting Auto Sequence Operation
To exit auto sequence operation and return to normal operation, send the command:
PROGram:EXIT
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Operation
Auto Sequencing
Set V, I, and P The voltage, current and power setpoints can be limited to less than the supply rating
range to match the tolerance of connected equipment or any other criteria you may
have.
Limits
Once the limits have been changed from the supply’s default rated output, settings
outside this range are no longer accepted.
Note Setpoint limits do not apply to the triggered outputs and auto sequence outputs.
To set the voltage limits:
SOUR:VOLT:LIM:HIGH <voltage>
SOUR:VOLT:LIM:LOW <voltage>
To set the current limits:
SOUR:CURR:LIM:HIGH <current>
SOUR:CURR:LIM:LOW <current>
If the high end of the range was set to 5 volts, the command, SOUR:VOLT 10 would
return an error.
Triggered To set a triggered setpoint:
SOUR:VOLT:TRIG <voltage>
Setpoints
SOUR:CURR:TRIG <current>
See “Triggering Commands” on page 66 for more information.
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Operation
Auto Sequencing
Triggering Triggers are event-driven signals that instruct power supplies to change their output.
Triggering provides a method to control changes in the power supply’s output and to
program several power supplies to react at the same time. Triggering is useful in
manufacturing processes where power requirements change as the machinery
performs different operations.
Commands
CAUTION
!
Setpoint limits do not apply to triggered setpoints.
To program triggers:
1. Configure the desired output levels as a result of a trigger.
:VOLT:TRIG {<voltage>|MAX|MIN|DEF}
:CURR:TRIG {<current>|MAX|MIN|DEF}
The user can choose to set both or just one of voltage or current triggered levels.
DEF (DEFault) means that when a trigger is received, no change will occur.
2. Specify a trigger signal source.
TRIG:SOURce {BUS|EXT|IMM|NONE} Where:
• BUSmeans the trigger source is the IEEE 488.1 GET or “*TRG”
• EXTmeans the source is the external trigger line. See “User Lines” on page
40
• IMMmeans the trigger source is the SCPI command INIT:IMM
• NONEmeans triggering is disabled.
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Operation
Auto Sequencing
Slew Rate The slew rate is calculated as a function of change in the output voltage and a given
time interval. The maximum slew rate is 1% rated voltage/150us. The slew rate is
saved upon power off and restored at power on. Output ON/OFF and shutdown are
not affected by the programmable slew rate. These functions have a slew rate of
1%/20ms.
The range of output voltage is 5% - 0.1% of rated voltage.
The range of time interval is 1.5 s - 150 us.
The negative slew rate is limited by the discharge rate of the output capacitors.
During current share, slaves operate with their default slew rate. The master operates
at its programmed slew rate. Hence a programmable slew rate for the system is
achieved. However, this slew rate is limited by the speed of the control loop. The
slaves will return to their programmed slew rate when they exit current share slave
operation.
The slew rate error increases as the slew rate increases.
The SCPI commands for changing the voltage slew rate are:
:VOLT:SLEW:STEP {<slewrate-voltage> | MAX | MIN | DEF}
where voltage-step has the units V, mV, etc.
and the range is 0.1% to 5% of rated voltage for the power supply.
default step is 0.1% of rated output voltage.
query returns value in volts.
:VOLT:SLEW:INTerval {<slewrate-interval> | MAX | MIN | DEF}
where time interval has the units s, ms, or us
and the range is 150 us to 1.5s
default interval is 150us.
query returns value in volts.
CAUTION
!
Check both the voltage step and the interval to ensure you get the required slew rate.
Selecting DEFAULT for both settings will return the slew rate to the default value
of 1% rated voltage per 150us.
The combination must not exceed 1%/150us. Though the software will attempt to
achieve higher slew rates, it is limited to this value by hardware constraints.
Manufacturer's recommendation is to keep the slew rate at or below the default
value.
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Operation
Auto Sequencing
Example:
Set a slew rate of 100V/10s for a 100V-60A power supply. This slew rate is 1V/0.1s,
which is within the acceptable range.
Send the commands:
“:VOLT:SLEW:STEP 1”, and
“:VOLT:SLEW:INT 100ms”
Using smaller steps will result in a smoother curve.
Identification The identification query command returns a string that states the manufacturer,
model, serial number, and firmware revision.
Query
*IDN?
may return “Xantrex, XFR 10-120, 100000, 3.000/0/0/0000.
Option *OPT?
Identification
or
Query
SYST<channel>:OPTion?
The option identification query returns a string listing any reportable options that are
installed in the power supply. Reportable options are GPIB and CANbus, but may
include others in the future. A zero will be returned if no options are installed.
Example:
*OPT?may return "GPIB, CANBUS"to indicate that both the GPIB and CANbus
(Multichannel/Current Share) options are installed.
SCPI Version SYST:VERS?
Query
will return the SCPI version to which the unit complies (for example 1997-0).
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Section 4. Status Registers
Overview
The Status Register structure is mandatory for SCPI and IEEE 488.2 compliance.
The register bits are defined by the SCPI and IEEE 488.2 standards.
Each status register has a Condition, Event, and Enable register and transition filters.
See “Status Register Commands” on page 81 for commands to read or change their
values.
Condition Transitions of the condition register are automatic and reflect the condition of the
instrument at the moment. Reading a condition register has no effect on the contents.
Register
Event The event register bits are set automatically to correspond with changes in the
condition register. The rules are dependent on the positive and negative transition
registers. Reading an event register clears it. The *CLS command clears all event
registers.
Register
Enable The enable register enables reporting of the event bits to the summary bit or the status
byte. The contents of the enable register are unchanged by *CLS and *RST.
Register
Transition A positive transition filter allows an event to be reported when a condition changes
from false to true. Setting both positive and negative filters to TRUE allows an event
to be reported any time the condition changes. Clearing both filters disables event
reporting.
Filters
The contents of transition filters are unchanged by *CLS and *RST.
The status registers maybe be divided into 4 categories, the operation status registers,
the questionable status registers, the standard event status register and the status byte.
The default setting for all transition filters is to report only positive (FALSE to
TRUE) transitions.
OPERation The operation status register is a 16-bit register which contains information about
conditions which are part of the power supply’s normal operation.
Status
Register
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Status Registers
Overview
summary bit.
Figure represents the Operation Status data structure. The “+” represents the logical
summation of bits in a register. Table 4.1, Table 4.2, Table 4.3, Table 4.5, and Table
4.6 describe the meanings of each bit as well as the bit number and bit weight.
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Status Registers
Overview
0
1
CV
CC
STATus:OPERation:REGulating
2
Reserved
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
3
4
5
6
7
+
8
9
0
1
Over VOLtage
Under VOLTage
Over CURrent
Under CURrent
Reserved
10
11
12
13
14
15
2
3
4
5
Reserved
6
AC Fail
7
Over TEMperature
SENSe
0
1
PROTection Summary
INTerlock
COMMand
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
+
8
STATus:OPERation:SHUTdown
9
FOLDback
Output Fail
Not Used
Not Used
Not Used
2
10
11
12
13
14
15
3
4
5
0
1
2
3
4
5
6
7
CALibrating
Not Used
Not Used
Not Used
Not Used
6
Not Used
Not Used
7
+
8
9
10
11
12
13
14
15
STATus:OPERation:SHUTdown:PROTection
Waiting for TRIGger
Not Used
Not Used
+
8
REGulating Summary
SHUTdown Summary
Remote CONtrol Summary
Current SHare Summary
Not Used
to Status
Byte
bit 7
9
10
11
12
13
14
15
0
1
Reserved
Reserved
STATus:OPERation:RCONtrol
Not Used
PROGram running
Not Used
2
GPIB Control
3
GPIB Control with LLO
Reserved
4
5
Reserved
Multi-channel Control
STATus:OPERation
6
7
Multi-channel Control with LLO
Not Used
+
8
9
Not Used
10
11
12
13
14
15
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
0
1
MASTer
SLAVe
STATus:OPERation:CSHare
2
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
3
4
5
6
7
+
8
9
10
11
12
13
14
15
Figure 4.1 Operation Status Registers
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Status Registers
Overview
Table 4.1 OPERation Status Register
Bit Bit Weight Bit Name
Description
0
1
CALibrating
Indicates that the supply is in
CALibration Mode.
1
2
3
4
5
2
4
Reserved
Reserved
Reserved
Reserved
Not implemented
Not implemented
Not implemented
Not implemented
8
16
32
Waiting for TRIGger
Summary
Indicates if the supply is waiting
for a TRIGger.
6
7
8
64
Reserved
Not implemented
Not implemented
128
256
Reserved
REGulating Summary
Reflects the summary of the
REGulating Sub-Register.
9
512
1024
2048
SHUTdown Summary
Reflects the summary of the
SHUTdown Sub-Register.
10
11
Remote CONtrol
Summary
Reflects the summary of the
Remote CONtrol Sub-Register.
Current SHareSummary
Reflects the summary of the
Current Share Sub-Register.
12
13
14
4096
8192
Not Used
Not used
Reserved
Not implemented
16384
PROGram Running
Indicates that an Automated
Sequence is running.
15
32768
Not Used
Not used
REGulating This describes the regulating mode. If none of these bits is active, the output
unregulated (UNRegulated) bit is active in the questionable status register.
Sub-Register
Table 4.2 REGulating Sub-Register
Bit
Bit Weight Bit Name
Description
0
1
CV
The power supply is regulating in Constant
Voltage mode.
1
2
CC
The power supply is regulating in Constant
Current mode.
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Status Registers
Overview
SHUTdown The Shutdown sub-register indicates the cause of the power supply shutdown. More
than one bit may be active, and multiple actions will be required to enable the output.
The protection shutdown sub-register indicates which protection mechanisms have
caused the power supply to shutdown.
Sub-Register
Table 4.3 SHUTdown Sub-Register
Bit
Bit Weight Bit Name
Description
0
1
2
4
PROTectio The power supply is shut down by a power
n Summary supply protection mechanism.
1
2
INTerlock
The power supply is shut down by INTerlock
signal.
COMMand The power supply is shut down by a command.
Protection
SHUTdown
Sub-Register
Table 4.4 Protection SHUTdown Sub-Register
Bit
Bit Weight Bit Name
Description
0
1
2
Over VOLTage
Over voltage protection has tripped
Under voltage protection has tripped
Over current protection has tripped
Under current protection has tripped
1
2
Under VOLTage
Over CURrent
Under CURrent
Reserved
4
3
8
4
16
5
32
Reserved
6
64
AC Fail
AC Fail protection has tripped
Over temperature protection has tripped
Sense protection has tripped
7
128
256
512
1024
Over Temperature
SENSe
8
9
FOLDback
Foldback protection has tripped
10
Output Fail
The power supply is shutdown by a
hardware circuit that monitors the output
and compares it to the setpoint.
Shutdown could indicate a bridge failure.
A temporary condition may be caused by
transients.
Remote This identifies which remote interface is controlling the unit. Only one bit is active
at a time with the exception of analog control, where voltage or current alone, or both
may be under remote control. Current share mode is considered to be under local
control, even though the user cannot adjust the voltage setting from the front panel.
CONtrol
Sub-Register
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Overview
Table 4.5 Remote CONtrol Sub-Register
Bit
Bit Weight Bit Name
Description
0
1
2
4
Reserved
Reserved
1
2
GPIB
The power supply is under Remote CONtrol via
the GPIB interface.
CONtrol
3
8
GPIB
CONtrol
with LLO
The power supply is under Remote Control via
the GPIB interface, with local controls locked out.
4
5
6
16
32
64
Reserved
Reserved
Reserved
Reserved
Multi-chann The power supply is under Remote CONtrol via
el CONtrol the Multi-channel Programming interface.
7
128
Multi-chann The power supply is under Remote CONtrol via
el Control
with LLO
the Multi-channel Programming interface, with
local controls locked out.
Current This register shows the state of the current share configuration, which can be set
through the SCPI command SOURce:COMBine:CSHare:MODE.
SHare
Sub-Register
Table 4.6 Current SHare Sub-Register
Bit
Bit Weight Bit Name
Description
0
1
MASTer
The power supply is configured to be a Current
Share Master.
1
2
SLAVe
The power supply is configured to be a Current
Share Slave.
QUEStionable The Questionable Status Register is a 16-bit register that stores information about
questionable events or status during power supply operation. That is, bits in these
registers may indicate that the output of the supply is of undesirable or questionable
quality.
Status
Register
sub-registers representing the status of the voltage and current, power and
temperature.
Figure 4.2 gives an overview of the Questionable Status data structure. The “+”
represents the logical summation of bits in a register. Table 4.7, Table 4.8, and Table
4.9 describe the meanings of each bit as well as the bit number and bit weight.
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0
1
Over VOLtage
Under VOLtage
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
STATus:QUEStionable:VOLTage
2
3
4
5
6
7
+
8
9
10
11
12
13
14
15
0
1
VOLTage Summary
CURRent Summary
Not Used
Reserved
Over Temperature
Not Used
STATus:QUEStionable
0
1
Over CURrent
Under CURrent
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
2
STATus:QUEStionable:CURRent
3
2
4
3
5
4
6
Not Used
Not Used
CALibration
Not Used
Not Used
AC Fail
UNRegulated
Not Used
Not Used
Not Used
5
7
6
+
8
7
to Status
Byte
bit 3
9
+
8
10
11
12
13
14
15
9
10
11
12
13
14
15
Figure 4.2 Questionable Status Registers
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Status Registers
Overview
Table 4.7 QUEStionable Status Register
Bit Bit Weight Bit Name
Description
0
1
VOLTage Summary
Reflects a summary of the
VOLTage Sub-Register.
1
2
CURRent Summary
Reflects a summary of the
CURRent Sub-Register.
2
3
4
4
8
TIME
Not implemented
Reserved
16
Over Temperature
Indicates the OTP circuit has
tripped.
5
6
7
8
32
64
FREQuency Summary
PHASe Summary
MODulation Summary
CALibration
Not implemented
Not implemented
Not implemented
128
256
Indicates an error in the unit
calibration.
9
512
Not Used
Not Used
AC Off
Not implemented
10
11
12
1024
2048
4096
Not implemented
Indicates an AC Supply failure.
UNRegulated
Indicates that the output is not
regulated in either Constant
Voltage mode, Constant Current
mode or Constant Power mode.
Reflects the inverse of the
Operation Regulation Summary bit.
13
14
15
8192
16384
32768
INSTrument Summary
Command Warning
Not Used
Not implemented
Not implemented
Always zero
VOLTage This shows whether the present voltage level is over or under the specified trip limit.
Sub-Register
Table 4.8 VOLTage Sub-Register
Bit Bit Weight Bit Name
Description
0
1
1
2
Over VOLtage
Set if the supply’s output voltage
exceeds the over-voltage trip level,
either user-specified variable trip limit,
or the fixed trip limit.
Under VOLtage
Set if the supply’s output voltage is less
than the user-specified under-voltage
trip level (variable trip limit) and the
supply is in Operation state.
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Overview
CURRent This shows whether the present current level is over or under the specified trip limit.
Sub-Register
Table 4.9 CURRent Sub-Register
Bit Bit Weight Bit Name
Description
0
1
Over CURrent
Set if the supply’s output current is
greater than the user-specified
over-current trip level (variable trip limit)
and the supply is in Operation state.
1
2
Under CURrent
Set if the supply’s output current is less
than the user-specified under current
trip level (variable trip limit) and the
supply is in Operation state.
operation. All bits in the standard event status registers are set through the error event
queue. The register is defined by 488.2 and is controlled using 488.2 common
commands, *ESE, *ESE?, and *ESR?.
Event Status
Register
Figure 4.3 summarizes the standard Event Status Register
0
1
Operation Complete
Not Used
2
Query Error
Device Dependent Error
Execution Error
Command Error
User Request
Power On
0
1
2
3
4
5
6
7
Not Used
Not Used
Not Used
Summary of QUESTionable Status
MAV
3
4
5
6
7
+
8
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
RQS/MSS
Summary of OPERation Status
9
10
11
12
13
14
15
Status Byte
Standard Event Status Register
Figure 4.3 IEEE 488.2 Status Register and Status Byte
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Overview
Table 4.10 Standard Event Status Register
Bit Bit Weight Bit Name
Description
0
1
Operation
Complete
(OPC)
Set if *OPC command has been received
and all pending operations have been
completed. The message, Event –800
Operation Complete, is loaded into the
Error/Event Queue.
1
2
2
4
Request Control
(RQC)
Not implemented. Always set to 0.
Query Error
(QYE)
Set if an attempt is being made to read
data from the output queue when no
output is either present or pending.
Suggests that data in the output queue has
been lost. See “Query Error List” on
page 121 for possible error codes.
3
4
8
Device Dependent Set if there is a device-specific error. See
Error
(DDE)
“Device-Specific Error List” on page
120 for possible error codes.
16
Execution Error
(EXE)
Set if a program data element, following a
header, was evaluated by the power
supply as outside of its legal input range,
supply’s capabilities. Suggests that a valid
program message could not be properly
executed due to some power supply
condition. See “Execution Error List” on
page 118 for possible error codes.
5
6
7
32
64
Command Error
(CME)
detected by the parser, an unrecognized
header was received, or a group Execute
Trigger was entered into the input buffer
inside an IEEE 488.2 program message.
See “Command Error List” on page 118
for possible error codes.
User Request
(URQ)
Set if the bit is unmasked and the
instrument wishes to support a 488.2 user
request event. An event occurs when the
instrument detects the activation of a user
request local control. The message, Event
–600 User Request, is loaded into the
Error/Event Queue.
128
Power ON
(PON)
Not implemented
8–15
Reserved
Reserved for possible future use by IEEE.
Bit values are reported as zero.
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Status Registers
Overview
Status Byte The Status byte register contains the STB and RQS(MSS) messages as defined in
488.1. The user can read the status byte register using a 488.1 serial poll or the 488.2
*STB? common command. If the user sends a serial poll, bit 6 will respond with
Request Service (RSQ). The value of the status byte is not altered by a serial poll.
The *STB? query causes the device to send the contents of the Status Byte Register
and the Master Summary Status (MSS) summary message. The *STB? query does
not alter the status byte, MSS, or RQS.
Table 4.11 Status Byte Summary Register
Bit
Bit Weight
Bit Name
Reserved
Reserved
Description
0
1
2
1
2
4
Error/Event
Queue (ERR)
Set if any errors are present in
the Error/Event queue.
3
8
Questionable
Status Register
(QSR)
Set if any bits are set in the
Questionable Status Event
register and the corresponding
bit then the Questionable
Status Enable register is TRUE.
4
16
Message
Available (MAV)
MAV is TRUE if the power
supply is ready to accept a
request from the controller to
output data. FALSE when the
output queue is empty.
5
6
7
32
64
Standard Event
Status Bit
Summary (ESB)
A summary of the Standard
Event Status Register. TRUE
with a bit is set in the Standard
Event Status register.
Request Service
(RQS)
Master Status
Summary (MSS)
MSS indicates that the device
has at least one reason for
requesting service.
128
Operation Status
Register (OSR)
TRUE if a bit is set in the
Operation status register and
the corresponding bit in the
Operation Status Enable
register is set.
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Status Registers
Overview
Master The Master Summary Status message indicates that the power supply has at least one
reason for requesting service. Although the MSS message is sent in bit position 5 of
the response to *STB?, it is not sent in response to a serial poll and not considered
part of the Status Byte.
Summary
Status (MSS)
MSS is TRUE if:
•
•
•
•
•
•
•
Status Byte bit 0 AND Service Request Enable Register bit 0, or
Status Byte bit 1 AND Service Request Enable Register bit 1, or
Status Byte bit 2 AND Service Request Enable Register bit 2, or
Status Byte bit 3 AND Service Request Enable Register bit 3, or
Status Byte bit 4 AND Service Request Enable Register bit 4, or
Status Byte bit 5 AND Service Request Enable Register bit 5, or
Status Byte bit 7 AND Service Request Enable Register bit 7.
Request RQS is TRUE if the Service Request Enable Register has a bit set and there is a
corresponding bit within the Status Byte.
Service
(RQS)
The SRQ line of the GPIB will be set. The SRQ annuciator will be lit.
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Status Registers
Status Register Commands
Status Register Commands
In the following sections <status-enable> is a value from 0 to 32767 representing a
15-bit register mask.
SCPI Status Preset Status
Commands
STATus[<channel>]:PRESet
Configures the status data structures to ensure that certain events are reported at a
higher level through the status-reporting mechanism. These events are summarized
in the mandatory structures, the Operation Status Register, and Questionable Status
Register.
The PRESet command affects only the enable registers and the transition filter
registers of the status data structures. PRESet does not clear any of the event registers
or any item from the error/event queue. The *CLS command is used to clear all event
registers and queues in the device status-reporting mechanism.
For the device-dependent status data structures, the PRESet command sets the enable
register to all 1s and the transition filter register to report only positive transitions.
For the SCPI mandatory status data structures, the PRESet command sets the
transition filter registers to recognize only positive transitions and sets the enable
register to 0s. The following will not be affected by this command: Service Request
Enable Register, Parallel Poll Enable Register, the memory register associated with
the *SAV command, the power supply address, Output Queue, and the
power-on-status-clear flag setting.
Table 4.12 Preset Values of User Configurable Registers
Register
Filter/Enable
Preset Value
Operational
Enable Register
Positive Transition Filter
Negative Transition Filter
0s
1s
0s
Questionable Enable Register
Positive Transition Filter
0s
1s
0s
Negative Transition Filter
All others
Enable Register
Positive Transition Filter
Negative Transition Filter
1s
1s
0s
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Status Registers
Status Register Commands
IEEE 488.2 Clear Status Command
Status and
Clears all Event Registers, including the Status Byte, the Standard Event Status and
the Error Queue.
Event
Commands
*CLS
or the multichannel equivalent:
STATus<channel>:CLEar
Standard Event Status Enable Register
The Event Summary Enable command determines which bits in the Standard Event
Status Register are summarized in the Event Summary Bit (ESB) of the Status Byte.
The Power-on Status Clear command determines if the Standard Event Status Enable
Register is cleared at power-on.
E.g.
Sending "*ESE 16" sets bit 4 of the Standard Event Status Enable Register. This will
cause the Event Summary bit (ESB) in the Status Byte to be set whenever the
Execution Error bit (bit 4) in the Standard Event Status Register gets set.
Command: *ESE <status-enable>, *ESE?
or the multichannel equivalent:
STATus<channel>:STANdard:ENABle <status-enable>
STATus<channel>:STANdard:ENABle?
Standard Event Status Register
The Standard Event Status Register query allows the user to determine the current
contents of the Standard Event Status Register. (See “Standard Event Status
Register” on page 77.) Reading this register clears it.
Command: *ESR?
SCPI equivalent for multichannel use:
STATus<channel>:STANdard[:EVENt]?
Service Request Enable Register
The Service Request Enable Register allows the user to select the reasons for the
power supply to issue a service request. The Service Request Enable Register allows
the user to select which summary messages in the Status Byte Register may cause
service requests.
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Status Registers
Status Register Commands
To clear the Service Request Enable Register send "*SRE 0." The Power-on Status
Clear command also determines if the Service Request Enable Register is cleared at
power-on. A cleared register does not allow status information to generate a service
request.
E.g.
Sending "*SRE 8" sets bit 3 of the Service Request Enable Register. This will cause
the Summary bit of the Questionable Status register (bit 3) in the Status Byte to
generate a service request message whenever it gets set.
*SRE <status-enable>, *SRE?
or the multichannel equivalent:
STATus<channel>:SREQuest:ENABle <status-enable>
STATus<channel>:SREQuest:ENABle?
Parallel Poll Enable Register
Each of the 16 bits in the Parallel Poll Enable register correspond to bits in the Status
Byte. Each bit in the Parallel Poll Enable register is ANDed with its corresponding
bit in the Status Byte and the resulting bits are ORed together to generate ist.
Therefore using the parallel poll enable register allows any single bit or combination
of bits to control the ist message.
The Power-on Status Clear command determines if the Parallel Poll Enable Register
is cleared at power-on.
E.g.
Sending "*PRE 8" sets bit 3 of the Parallel Poll Enable Register. This will cause the
Summary bit of the Questionable Status register (bit 3) in the Status Byte to generate
a TRUE ist message whenever it gets set.
Command: *PRE <status-enable>, *PRE?
Status Byte
The status byte query will return the contents of the status byte register and the MSS
(Master Summary Status) message. The response is in the format of a weighted
decimal value representing the status byte register and the MSS message (bit 6).
Thus, the response to *STB? is identical to the response to a serial poll except that
the MSS message appears in bit 5 in place of the RQS message. (See “Status Byte”
on page 79 for details.)
*STB?
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Status Registers
Status Register Commands
or the multichannel equivalent
STATus<channel>:SBYTe[:EVENt]?
Power-on Status Clear
The Power-On Status Clear command controls the automatic power-on clearing of
the Service Request Enable Register, the Standard Event Status Enable Register, the
Parallel Poll Enable Register and the Error/Event Queue.
*PSC {0|1}, *PSC?
or the multichannel equivalent
SYSTem<channel>:POSClear {ON|OFF|0|1}
SYSTem<channel>:POSClear?
Individual Status Query
The individual status query allows the programmer to read the state of the IEEE
488.1 ist (individual status) message without performing a parallel poll. The query
returns a "1" or "0."
The ist message is formed by ANDing the bits in the Parallel Poll Enable Register
(*PRE) with the Status Byte and then ORing the result. In other words, the ist is
TRUE if any of bits of the Parallel Poll Enable Register AND'ed with the Status Byte
are TRUE.
*IST?
Operation Complete
The Operation Complete command causes the power supply to generate the
operation complete message in the Standard Event Status Register when all pending
operations have been finished.
*OPC, *OPC?
Wait-to-Continue Command
The Wait-to-Continue command prevents the power supply from executing any
further commands or queries until the no-operation-pending flag is TRUE.
*WAI
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Status Registers
Status Register Commands
Operation Query Operation Status Register Condition
Status
Register
STAT[<channel>]:OPER:COND?
Commands
Query Operation Status Register Event
STAT[<channel>]:OPER[:EVEN]?
Enable Operation Status Register
STAT[<channel>]:OPER:ENAB <status-enable>
Set Operation Status Positive Transition Filter
STAT[<channel>]:OPER:PTR <status-enable>
Set Operation Status Negative Transition Filter
STAT[<channel>]:OPER:NTR <status-enable>
Regulating Query Regulating Condition
Sub-Register
Commands
STAT[<channel>]:OPER:REG:COND?
Query Regulating Event
STAT[<channel>]:OPER:REG[:EVEN]?
Enable Regulating Sub-Register
STAT[<channel>]:OPER:REG:ENAB <status-enable>
Set Regulating Positive Transition Filter
STAT[<channel>]:OPER:REG:PTR <status-enable>
Set Regulating Negative Transition Filter
STAT[<channel>]:OPER:REG:NTR <status-enable>
Shutdown Query Shutdown Condition
Sub-Register
Commands
STAT[<channel>]:OPER:SHUT:COND?
Query Shutdown Event
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Status Registers
Status Register Commands
STAT[<channel>]:OPER:SHUT[:EVEN]?
Enable Shutdown Sub-Register
STAT[<channel>]:OPER:SHUT:ENAB <status-enable>
Set Shutdown Positive Transition Filter
STAT[<channel>]:OPER:SHUT:PTR <status-enable>
Set Shutdown Negative Transition Filter
STAT[<channel>]:OPER:SHUT:NTR <status-enable>
Protection Query Protection Shutdown Condition
Shutdown
Sub-Register
Commands
STAT[<channel>]:OPER:SHUT:PROT:COND?
Query Protection Shutdown Event
STAT[<channel>]:OPER:SHUT:PROT[:EVEN]?
Enable Protection Shutdown Sub-Register
STAT[<channel>]:OPER:SHUT:PROT:ENAB <status-enable>
Set Protection Shutdown Positive Transition Filter
STAT[<channel>]:OPER:SHUT:PROT:PTR <status-enable>
Set Protection Shutdown Negative Transition Filter
STAT[<channel>]:OPER:SHUT:PROT:NTR <status-enable>
Remote Query Remote Control Condition
Control
Sub-Register
Commands
STAT[<channel>]:OPER:RCON:COND?
Query Remote Control Event
STAT[<channel>]:OPER:RCON[:EVEN]?
Enable Remote Control Sub-Register
STAT[<channel>]:OPER:RCON:ENAB <status-enable>
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Status Registers
Status Register Commands
Set Remote Control Positive Transition Filter
STAT[<channel>]:OPER:RCON:PTR <status-enable>
Set Remote Control Negative Transition Filter
STAT[<channel>]:OPER:RCON:NTR <status-enable>
Current Query Current Share Register Condition
Share
Sub-Register
Commands
STAT[<channel>]:OPER:CSH:COND?
Query Current Share Register Event
STAT[<channel>]:OPER:CSH[:EVEN]?
Enable Current Share Sub-Register
STAT[<channel>]:OPER:CSH:ENAB <status-enable>
Set Current Share Positive Transition Filter
STAT[<channel>]:OPER:CSH:PTR <status-enable>
Set Remote Control Negative Transition Filter
STAT[<channel>]:OPER:CSH:NTR <status-enable>
Questionable Query Questionable Status Register Condition
Status
Register
STAT[<channel>]:QUES:COND?
Commands
Query Questionable Status Register Event
STAT[<channel>]:QUES[:EVEN]?
Enable Questionable Status Register
STAT[<channel>]:QUES:ENAB <status-enable>
Set Questionable Status Positive Transition Filter
STAT[<channel>]:QUES:PTR <status-enable>
Set Questionable Status Negative Transition Filter
STAT[<channel>]:QUES:NTR <status-enable>
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Status Registers
Status Register Commands
Voltage Query Voltage Sub-Register Condition
Sub-Register
Commands
STAT[<channel>]:QUES:VOLT:COND?
Query Voltage Sub-Register Event
STAT[<channel>]:QUES:VOLT[:EVEN]?
Enable Voltage Sub-Register
STAT[<channel>]:QUES:VOLT:ENAB <status-enable>
Set Voltage Positive Transition Filter
STAT[<channel>]:QUES:VOLT:PTR <status-enable>
Set Voltage Negative Transition Filter
STAT[<channel>]:QUES:VOLT:NTR <status-enable>
Current Query Current Sub-Register Condition
Sub-Register
Commands
STAT[<channel>]:QUES:CURR:COND?
Query Current Sub-Register Event
STAT[<channel>]:QUES:CURR[:EVEN]?
Enable Current Sub-Register
STAT[<channel>]:QUES:CURR:ENAB <status-enable>
Set Current Positive Transition Filter
STAT[<channel>]:QUES:CURR:PTR <status-enable>
Set Current Negative Transition Filter
STAT[<channel>]:QUES:CURR:NTR <status-enable>
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Section 5. Current Sharing
Overview
CAUTION
!
Always exercise caution when using the current sharing feature. If a unit is set to
Master or Slave, it will be locked out of local operation. Current sharing units will
have their outputs disabled if one power supply enters shutdown.
The current sharing function allows power supplies to current share between units
connected in parallel. Current sharing can use a maximum of 5 supplies. All power
supplies must be the same model. Every unit must have a unique address. See
“Configure for Multichannel Operation” on page 35.
LOAD
(REQUIRES 28V-500A)
GPIB CONTROL
28V 100A
28V 100A
28V 100A
28V 500A
28V 100A
- MAXIMUM 5 UNITS
- IT IS RECOMMENDED THAT YOU KEEP THE LOAD CABLES THE SAME LENGTH
Figure 5.1 Example of Current Share Operation
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Current Sharing
Overview
Theory of Power supplies may be connected in parallel to supply a large current to a load.
Typically, because of differences in the load connections, each power supply may
provide different amounts of current to the load.
Operation
When multiple power supplies are configured for current sharing, the master supply
will make minute changes to the slave’s voltage and current to equalize the current
draw from each. The slaves will track the master's voltage, current, output and output
on/off setting. Protection limits are controlled and monitored on the master unit.
Configure The current sharing modes available are:
Current
Share
•
•
•
No sharing
Master: sets up the unit as the master controller.
Slave: sets up the unit as the controlled slave.
Select whether the unit will operate as a master or slave unit:
SOURce:COMBine:CSHare:MODE [MASTer|SLAVe|OFF]
To query the total output current of all current sharing units, use the SCPI command:
MEAS:CURR? SUM
operating.
STAT:OPER:CSH:COND?
See Table 4.9, “CURRent Sub-Register,” on page 77 for a description of the bits in
Setup To set up multiple supplies for current share operation, follow these steps:
Current
Sharing
Network
1. Configure each supply with a unique multichannel address. (See “Configure for
Multichannel Operation” on page 35.)
Configure one supply to operate as the master. Configure others to operate as
slaves.
2. Power down the units. Connect the CAN ports of all paralleled units as you
would for multichannel operation
3. Make load connections. It is recommended to keep load cables the same length
if possible. See Figure 5.1.
4. Power up the master, then all slaves.
5. Set the voltage on the master, then enable the output.
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Current Sharing
Operation
Operation
Once a current sharing network is setup, you may adjust the voltage setpoint on the
master. The master will automatically adjust the setpoints of the slave units to
equalize the current output of all units. You may also disable or enable the output of
the master, automatically disabling or enabling the output of all slaves.
You must use GPIB control to operate the master.
Slaves will be operating under remote control from the master and in local lockout.
Hence, they will only respond to remote queries. XFR or XHR power supplies will
still respond to the STANDBY key on the front panel.
Power supplies may not enter calibration mode while current sharing, or enter
current share operation while in calibration mode.
Errors The slave will queue and error if it does not detect a master on the network. Check
the cable and the master configuration.
A master or slave will be disabled from current sharing (set to "No share") if:
•
•
•
there is more than one master connected to the CANbus, (Error +1811)
there are more than 4 slaves, (Error +1822), or
the model does not match that of the master, (Error +1822).
In each of these cases, the current share mode will be set to “No share”.
If a unit becomes disconnected due to a failure in communications, the master will
queue error +1812, "Current Share Slave Lost" and the slave will queue error +1821,
"Current Share Master Lost." The slave's output will be disabled, and the slave
annunciator will flash.
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Current Sharing
Operation
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Appendix A. GPIB
Overview
This power supply can be programmed from a remote terminal using a General
Purpose Interface Bus (GPIB) interface. Communications over the GPIB interface
meet IEEE 488.2 standards and are SCPI compliant.
Codes and Standards
The GPIB interface of the this Programmable DC Power Supply has been
implemented according to IEEE standard 488.1-1987, “IEEE Standard Digital
Interface for Programmable Instrumentation.”
The communications protocol complies with IEEE 488.2-1992.
Message Terminators
The GPIB End of message (EOM) terminators can be the END message (EOI), the
ASCII code for line feed (LF) or both.
The power supply terminates responses with line feed (LF).
Address Range
Primary The power supply will respond to any GPIB address in the range 1 to 30.
Secondary The power supply does not support secondary addressing.
The power supply's serial poll responses and SRQ generation use an IEEE 488.2
reporting structure. See“The Status Register structure is mandatory for SCPI and
IEEE 488.2 compliance. The register bits are defined by the SCPI and IEEE 488.2
standards.” on page 69.
The Request Service bit (bit 6) in the Status Byte will generate a service request
(SRQ) on the GPIB.
The power supply can be set up to generate a service request (SRQ) at power-on. Use
the command:
SYSTem:COMMunicate:GPIB:PONSrq [ON|OFF|1|0]
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GPIB
Protocol Specifications
Protocol Specifications
Multiline IEEE 488.2 (Section 5) requires specific Device Interface Functions.
Control
Functions
Table A.1Multiline Control Functions
Function
Mnemonic Description
Functions Subset
Source
Handshake
SH1
AH1
T6
Complete capability
SIDS, SGNS, SDYS, STRS,
SWNS, SIWS
Acceptor
Handshake
Complete capability
Includes serial poll
AIDS, ANRS, ACRS, ACDS,
AWNS
Talker
TIDS, TADS, TACS, SPAS,
SPIS, SPMS, TPIS, TPAS
Listener
L4
LIDS, LADS, LACS, LPIS,
LPAS
Interface IEEE 488.1 (Section 2).
Functions
Table A.2Interface Functions
Function
Mnemonic Description
Functions Subset
DCIS, DCAS
Device Clear
Device Trigger
Drivers
DC1
DT1
E2
Complete capability
Complete capability
DTIS, DTAS
Tri state drivers where
selectable
Parallel Poll
PP1
RL1
SR1
Parallel Poll
Remote/Local
Complete capability
Complete capability
LOCS, LWLS, REMS, RWLS
NPRS, SQRS, APRS
Service
Request
Controller
C0
Device does not act as a
controller
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GPIB
Electrical Specifications
Electrical Specifications
Driver IEEE 488.2 (Section 3.3).
Requirements
Table A.3Driver Types for Interface Lines
Signal
Driver
Line
Signal
Line
Driver
DIO1
DIO2
DIO3
Tri State
Tri State
Tri State
EOI
Tri State
Tri State
DAV
NRFD
Open Collector
(mandatory)
DIO4
Tri State
NDAC
Open Collector
(mandatory)
DIO5
DIO6
DIO7
Tri State
Tri State
Tri State
REN
IFC
Tri State
Tri State
SRQ
Open Collector
(mandatory)
DIO8
Tri State
ATN
Tri State
Driver Specifications for 1 megabyte/second:
•
•
Low State: Output voltage < +0.5V at +48mA sink current
High State: Output Voltage (3 state) ≥ +2.4V at -5.2mA
The Output Voltage (open collector) is dependent on the composite Device Load
Requirements. The Voltage values are measured at the device connector between the
signal line and the logic ground.
Mechanical Specifications
Mechanical Specifications comply with IEEE 488.1 standards.
See Appendix E for details.
Performance Specifications
The power supply responds within 2 ms of receiving a command over the GPIB
interface.
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Performance Specifications
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Appendix B. SCPI Command Reference
Overview
This appendix provides a summary of the Standard Commands for Programmable
Instruments (SCPI) that are supported by the this Programmable Interface Card.
Codes and Standards
This power supply conforms to the following international standards:
•
•
•
IEEE Std 488.2-1992 “IEEE Standard Codes, Formats, Protocols, and Common
Commands For Use With IEEE Std 488.1-1987”
IEEE Std 488.1-1987 “IEEE Standard Digital Interface for Programmable
Instrumentation”
Standard Commands for Programmable Instruments (SCPI) Version 1997.0
IEEE 488.2 GPIB control implements all IEEE 488.2 requirements. See Appendix A. “GPIB”
for details.
Requirements
SCPI The power supply implements the following in order to meet SCPI requirements:
Requirements
•
•
•
•
•
SCPI mandated commands
Questionable Status Register (QSR), Condition, Event, Enable
Operation Status Register (OSR), Condition, Event, Enable
Status Byte Register (SBR)
Standard Event Status Register (SESR)
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SCPI Command Reference
IEEE-488.2/SCPI Syntax and Style
IEEE-488.2/SCPI Syntax and Style
Parameters Units of Measure and Multipliers
The default units of measure include:
•
•
•
•
V (Volt – voltage)
A (Ampere – current)
W (Watt – power)
S (seconds – time)
The supported optional multipliers include:
•
•
m (milli)
k (kilo)
Note The SI standard for these multipliers is specifically lowercase, while the IEEE
standard specifies uppercase. Both combinations are supported.
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SCPI Command Reference
Understanding SCPI Commands
Understanding SCPI Commands
SCPI SCPI is an ASCII-based command language designed for use in test and
measurement equipment. The command structure is organized around common
roots, or nodes, which are the building blocks of SCPI subsystems. An example of a
common root is CALibration, and some of the commands that reside in the
CALibration subsystem are shown below.
Command
Hierarchy
CALibration
:CURRent
[:DATA] <numeric value>
:LEVel {MIN|MAX}
[:SECure]
:CODE <new code>
:STATe {OFF|ON}, <code>
:STATe?
CALibration is the root keyword of the command. CURRent and SECure are
second-level keywords, and DATA, LEVel, CODE, and STATe, are third-level
keywords. A colon (:) is used to separate a command keyword from a lower-level
keyword.
Using SCPI This manual may show SCPI commands in the either long or short format. An
example of the long format is:
Commands
CALibration:CURRent:LEVel {<current>|MIN|MAX}
The command is expressed as a mixture of upper- and lowercase letters. The
uppercase letters indicate how the command can be abbreviated to its short form:
CAL:CURR:LEV {<current>|MIN|MAX}
SCPI commands can be sent in long or short forms. The short form is typically better
for data entry. The long form is usually better for readability.
Command strings are not case sensitive: CURR, Curr, and curr are all acceptable
abbreviations for CURRent. As for the long form, CURRENT, Current, and current
are all acceptable.
The command strings include punctuation. While some punctuation is sent with the
string, other markings are used to identify different elements of the command syntax
and are not sent with the string.
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SCPI Command Reference
Understanding SCPI Commands
The following punctuation is sent with the command string:
•
•
•
•
Colons (:) separate command keywords from lower-level keywords.
For example, CAL:CURR:STAT.
Blank spaces separate command keywords from parameter values.
For example, CURR 0.1.
Commas separate parameters from each other when more than one parameter is
sent in the same string. For example, CAL:STAT OFF,”1234.”
Semicolons (;) separate multiple commands from the same subsystem. This
allows for greater efficiency. For example:
CAL:CURR:LEV MIN;VOLT:LEV MIN
is the same as typing:
CAL:CURR:LEV MIN
CAL:VOLT:LEV MIN
•
Colons and semicolons can be used together to link commands from different
subsystems. For example:
CAL:CURR:LEV MIN;:MEAS:CURR?
The following punctuation is not sent with the command string:
•
•
•
Braces ( { } ) identify a selection of choices. Choose one of the enclosed values.
Vertical bars, or pipes, ( | ) separate the choices found within the braces.
Angle brackets ( < > ) identify where specific values must be entered for a
parameter. For example, in the example at the top of the page, the parameter
<current> appears in the command string. To set the current setpoint to 0.1A, the
syntax is CAL:CURR:LEV 0.1.
•
Square brackets ( [ ] ) identify optional parameters or keywords. If an optional
parameter is not sent with the command string, a default parameter will be used.
Using Minimum and Maximum
In the following example, Minimum and Maximum are offered as alternative choices
to declaring a specific parameter value.
CAL:CURRent:LEVel {<current>|MIN|MAX}
The string CAL:CURR:LEV MINsets the current calibration level to the minimum
model value.
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SCPI Command Reference
Understanding SCPI Commands
Using Queries
A question mark lets you query the present value for most parameters. For example,
to query the current calibration state use:
CAL:SEC:STAT?
Most commands that include a parameter can be queried to determine the present
setting.
You can also use the following to query minimum and maximum allowed values for
most parameters:
:VOLT? MIN
:VOLT? MAX
Note If you send 2 queries, it is best to read and respond to the first response before trying
to read the second. Otherwise, you may receive an incomplete first response followed by a
complete second response. To avoid this, you can either wait for and read the first response
before sending the second query, or send a device clear message before sending the
second query.
Terminating Characters
Every command string must end with a terminating <new line> character. An
IEEE-488 EOI (end-or-identify) can be used instead of a <new line> character. It is
also acceptable to use a <carriage return> followed by a <new line>. Terminating a
command string always resets the SCPI command path to the root level.
Common Commands
The IEEE-488.2 standard includes a set of common commands for functions such as
reset and self-test. These common commands always start with an asterisk (*) and
may have one or more parameters. The command is always separated from the
parameter by a blank space. Multiple commands sent in the same string are separated
by a semi-colon (;). The following is an example of how 3 common commands can
be sent together in the same string:
*OPC; *PSC Off; *TRG
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SCPI Command Reference
Understanding SCPI Commands
Parameter Several different data types are defined for use in program messages and response
messages.
Types
Boolean Parameters
Boolean parameters are single binary conditions such as 1 and 0, or ON and OFF.
The following is an example of a command that uses Boolean parameters:
SYST:COMM:GPIB:PONS {ON|OFF|1|0}
Discrete Parameters
Discrete parameters are used when program settings have a limited number of
values. If you query a discrete parameter, the response will always be in the short
form with all uppercase letters. The following is an example of a command that uses
discrete parameters:
TRIG:SOUR {BUS|EXT|IMM|NONE}
Numeric Parameters
Numeric parameters may include decimal points, +/- signs, and scientific notation.
Values such as MINimum and MAXimum are sometimes accepted as substitutes for
numbers. When DEFault is provided as a parameter, the machine selects the default
value automatically. You can may also use unit suffixes such as, V, A, or W where
appropriate. In cases where specific numeric values are accepted, the power unit will
round the input parameters. The following is an example of a command that uses
numeric parameters:
VOLT:PROT {<voltage>|MAX|MIN}
String Parameters
String parameters are used when a series of ASCII characters is required. Strings
must be enclosed within single or double quotations. The beginning and ending
quotation marks must be matching. The following is an example of a command that
uses string parameters:
CAL:STAT ON,“0000”
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SCPI Command Reference
SCPI Command Summary
SCPI Command Summary
The SCPI commands supported by the this Programmable Power Supply are
described in the tables in the remainder of this section. These tables use the following
column headings:
•
•
•
•
Function The commonly used name for the function
SCPI Command The full command in long form
Description Explains what the command does or what is affected by it
Query? Indicates whether the unit supports a query version of the listed
command
Notations The following abbreviations are used in the command listings:
Used in the
•
N/A Not applicable. (The command has no associated setpoint value.)
Tables
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SCPI Command Summary
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SCPI Command Summary
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SCPI Command Summary
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SCPI Command Reference
Expressions
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Appendix C. Error Messages
Overview
Errors are placed in a queue as they are detected. The queue works on a first in, first
out (FIFO) basis. If the queue overflows, the last error in the queue is replaced with
error –350, “Queue Overflow”. When all errors have been read from the queue,
further error queries return 0, “No error”.
The error queue is cleared when any of the following occur (IEEE 488.2, section
11.4.3.4):
•
•
Upon receipt of a *CLS command
Upon reading the last item from the queue
All negative values are reserved by the SCPI standard. All errors unique to the power
supply have positive values.
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Error Messages
Command Error List
Command Error List
An error in the range [-199, -100] indicates that an IEEE 488.2 syntax error has been
detected by the instrument’s parser. The occurrence of any error in this class causes
the command error bit (bit 5) in the Event Status Register to be set.
Table C.1Command Error List
Error
Error Message Description
code
-100 Command error
This is the generic syntax error.
-105 GET not allowed
A Group Execute Trigger was received within a program message.
-114 Header suffix out of range
The value of a numeric suffix attached to a program mnemonic is out of range.
May refer to multichannel addressing, auto sequence number or auto
sequence step number.
-120 Numeric data error
This error is generated when parsing a data element which appears to be
numeric, including the non-decimal numeric types.
-123 Exponent too large
The magnitude of the exponent was larger than 32000.
-151 Invalid string data
The data with the enclosed (“) double apostrophes (string) is invalid.
Possibility of wrong length or character.
Execution Error List
An error in the range [-299, -200] indicates that an error has been detected by the
instrument’s execution control block. The occurrence of any error in the class causes
the execution error bit (bit 4) in the Event Status Register to be set.
Execution errors are reported by the device after rounding and expression evaluation
operations have taken place.
Table C.2 Execution Error List
Error
Error Message Description
code
-200 Execution error
This is the generic error for the power supply.
-203 Command protected
Indicates that a legal password-protected program command or query could not
be executed because the command was disabled. Check calibration state.
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Error Messages
Execution Error List
Error
code
Error Message Description
-220 Parameter error
Indicates that a program data element related error occurred.
-221 Setting conflict
Indicates that a legal program data element was parsed but could not be
executed due to the current power supply state.
Factors that may contribute to this error are:
Remote source - To set most values, the remote source must be correct.
Remote state - To set most values, the unit must be in remote mode.
Calibration mode - when in calibration mode, certain settings will cause as error.
Current share mode - When the unit is in current share mode (other than none)
certain settings will cause an error.
-222 Data out of range
Indicates that a legal command could not be executed because the interpreted
value was outside the legal range as defined by the power supply.
-225 Out of memory
The power supply has insufficient memory to perform the requested operation.
-231 Data questionable
Indicates that measurement accuracy is suspect.
-240 Hardware error (occurs during flash update if there is a failure)
Indicates that a legal program command or query could not be executed
because of a hardware problem in the power supply.
-241 Hardware missing
Indicates that a legal program command or query could not be executed
because of missing power supply hardware; e.g. an option not installed.
-282 Illegal program name
The name used to reference an auto sequence program was invalid or there is
no program selected.
-284 Program currently running
Certain operations dealing with auto sequence programs may be illegal while
the program is running. For example, deleting a running program is not
possible.
-285 Program syntax error
There is an error in the program definition.
-290 Memory use error
Indicates that a user request has directly or indirectly caused an error related to
memory or <data_handle>s. This is not the same as “bad” memory.
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Error Messages
Device-Specific Error List
Device-Specific Error List
An error in the range [-399, 300] or [1, 32767] indicates that the instrument has
detected an error which is not a command error, a query error, or an execution error;
some device operations did not properly complete, possibly due to an abnormal
hardware or firmware condition. These codes are also used for self-test response
errors. The occurrence of any error in the class causes the device-specific error bit
(bit 3) in the Event Status Register to be set.
Table C.3 Device-Specific Error List
Error
Error Message Description
code
-300
Device-specific error.
Indicates that the power supply could not complete the operation due to some
condition of the power supply.
-310
System error.
This error is queued when the power supply cannot convert the input to a
calibrated value.
-313
-314
Calibration memory lost.
Save/recall memory lost.
Indicates that the non-volatile data saved by the *SAV command has been lost.
-315
-321
Configuration memory lost.
Indicates that non-volatile configuration data saved by the power supply has
been lost.
Out of memory.
An internal operation needed more memory than was available.
-330
-350
Self-test failed.
Queue overflow.
A specific code entered into the queue in lieu of the code that caused the error.
This code indicates that there is no room in the queue and an error occurred
but was not recorded.
-360
Communication error.
This is the generic communication error for errors which cannot be classified
below.
-361
-362
Parity error in program message.
Parity bit not correct when data received.
Framing error in program message.
A stop bit was not detected when data was received, e.g. a baud rate
mismatch.
-363
Input buffer overrun.
Software or hardware input buffer on serial port overflows with data caused by
improper (or nonexistent) pacing.
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Error Messages
Query Error List
Query Error List
An error number in the range [-499, -400] indicates that the output queue control of
the instrument has detected a problem with the message exchange protocol described
in IEEE 488.2, chapter 6. The occurrence of any error in this class causes the query
error bit (bit 2) in the Event Status Register to be set.
Table C.4 Query Error List
Error
Error Message Description
code
-400 Query Error
This is the generic query error for the power supply, used only when the other
types of errors do not apply.
-410 Query INTERRUPTED
Generated when a new command was received before it could finish the query.
User Request Event
An error/event in the range [-699, -600] is used when the instrument wishes to report
a 488.2 user request event. This event also sets the user request bit (bit 6) of the
Standard Event Status Register.
Table C.5 User Request Event
Error
Error Message Description
code
-600 User request
Operation Complete Event
An error/event in the range [-899, -800] is used when the instrument wishes to report
a 488.2 operation complete event. This event occurs when an instrument’s
synchronization protocol, having been enabled by an *OPC command, completes all
selected pending operations. This event also sets the operation complete bit (bit 0) of
the Standard Event Status Register.
Table C.6 Operation Complete Event
Error
Error Message Description
code
-800 Operation complete
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Error Messages
Front Panel Error Codes
Front Panel Error Codes
Table C.7 Front Panel Error Codes
Error
code
Error Message Description
+1301 Front Panel Protocol Error
Invalid data from the front panel was sent to the CPU
+1302 Front Panel Not Responding
+1303 Front Panel Self-Test Failed
CPU Error Codes
Table C.8 CPU Error Codes
Error
code
Error Message Description
+1401 ColdFire Self-Test Failed
Analog Programming Interface Error codes
Table C.9 Analog Programming Interface Error code
Error
code
Error Message Description
+1501 Analog programming self-test failed
Auto Sequencing Error Codes
Table C.10Auto Sequencing Error Codes
Error
Error Message Description
code
+1601 Invalid step number
Step does not exist, is out of allowed range or preceding steps do not exist.
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Error Messages
CANbus Error Codes
CANbus Error Codes
Table C.11CANbus Error Codes
Error
code
Error Message Description
+1701 CANbus hardware missing
The CANbus option is not installed on the controller card, or controller card is
not present.
+1702 CANbus device specific error
An error has occurred on the CANbus circuit. Probable causes are AC input
too low, AC input not secure, controller card not securely fastened or other
noise sources.
+1703 CANbus input buffer corrupted.
+1704 CANbus input buffer corrupted.
+1705 CANbus input buffer overrun.
Data is sent on the CANbus faster than the CPU can process.
+1706 CANbus output buffer overrun.
Data cannot be transmitted fast enough.
Multichannel Error Codes
Table C.12Multichannel Error Codes
Error
Error Message Description
code
+1800 Multichannel general error
An error has occurred while sending multichannel commands. One such
cause is sending a command that is too long.
+1802 Multichannel address taken
The multichannel address configured for this unit has already been assigned
to another unit on the CANbus network.
+1803 Multichannel originator not responding
The originator of the message is not responding to the handshaking.
+1804 Multichannel recipient not responding
The recipient of the message is not acknowledging the reception of the
command.
+1805 Multichannel command overwritten
A received command through the CANbus has been overwritten.
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Error Messages
Current Share Error Codes
Current Share Error Codes
Table C.13Current Share Error Codes
Error
code
Error Message Description
+1900 Current Share General Error
+1911 Current share master already online
A unit on the CANbus network has already been assigned the current share
master unit. Only one is allowed per network.
+1912 Current share slave lost
One of the connected current share slaves have not responded in time.
+1921 Current share master lost
The assigned master has not responded in time.
+1922 Current share slave connection refused
Connection as a slave on the current share network has been refused due to
one of the following reasons:
4 slaves are already online,
the voltage rating does not match those of the master’s,
the current rating does not match those of the master’s.
+1924 Current share data out of range
The voltage or current readback or setpoint values passed are out of range.
+1925 Current share slave output off by unknown
One of the slave’s output is off because of unknown reasons
+1926 Current share slave output off by command
One of the slave’s output is off because of a command from a remote source
or the front panel.
+1927 Current share slave output off by AC fail
One of the slave’s output is off because of an AC fail condition.
+1928 Current share slave output off by OTP (Over Temperature Protection)
One of the slave’s output is off because of an OTP condition.
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Appendix D. Calibration
Overview
The calibration of the unit is software dependent; there are no potentiometers to
adjust.
The calibration points are set to 10% and 90% of the rated outputs and calibration
data is automatically calculated from the measurement date you provide.
The setting and readback accuracy of the power supply should be checked annually,
and calibration done only if the unit is not operating within its specification.
The OTP and AC off protection mechanisms are operational during calibration. All
other protection mechanisms are disabled.
Entering Calibration Mode
CAUTION
!
Calibration procedures should only be performed by qualified users. Failure to
adhere to this warning may cause damage to the power supply, or pose a safety
hazard for the user.
Calibration mode is entered by using the "change calibration state" SCPI command.
Ensure you are in remote mode and have the appropriate remote source setting.
To access calibration mode via remote interface, use the command:
CAL:STAT ON,"0000"1
To check if the power supply is in calibration mode, use the command:
CAL:STAT?
1. where the parameter "0000" may be replaced with your own 4-digit security code.
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Calibration
Setup and Equipment
Security code To protect calibration data, a security code is required to enter calibration mode. The
security code set at the factory to "0000." The password can be changed. Calibration
state must be ON to change the password.
The SCPI command to change the security code is:
CAL:CODE <security_code>
The security code is any 4-digit number enclosed by quotation marks. Trying to
change the password to an invalid one causes an error.
Setup and Equipment
To calibrate the option card you will need:
•
•
•
•
6 digit DVM
current shunt
variable load
Load wiring sized for the maximum available output current.
To set up to calibrate output voltage and current:
Connect a load to the output of the power supply and a current shunt in series.
You will need to use the DVM to measure both the voltage at the output of the power
supply and the voltage across the shunt. You will need to convert the voltage across
the shunt to a current measurement.
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Calibration
Calibration Procedure
Calibration Procedure
Calibration of programming and readback are combined in a single procedure.
Output 1. Set the load to open circuit. Attach a DVM across the output terminals.
Voltage
2. Minimum calibration level
Set the output voltage to 10% by sending the command:
CAL:OUTP:VOLT:LEV MIN
3. Enter voltage data
Enter the voltage read from the external DVM.
CAL:OUTP:VOLT:DATA <voltage>
4. Maximum calibration level
Set the output voltage to 90% by sending the command:
CAL:OUTP:VOLT:LEV MAX
5. Enter voltage data
Enter the voltage read from the external DVM.
CAL:OUTP:VOLT:DATA <voltage>
6. Power supply calculates and stores calibration constants.
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Calibration
Calibration Procedure
Output 1. Set the power supply and load operate at full output. You must ensure the power
Current
supply is operating in current mode during current calibration. Place a shunt on
the load line so that you can measure the current. Attach a DVM across the shunt
2. Minimum calibration level
Set the output current to 10% by sending the command:
CAL:OUTP:CURR:LEV MIN
3. Enter current data
Enter the current read from the external DVM via the shunt.
CAL:OUTP:CURR:DATA <current>
4. Maximum calibration level
Set the output current to 90% by sending the command:
CAL:OUTP:CURR:LEV MAX
5. Enter current data
Enter the current read from the shunt via the external DVM.
CAL:OUTP:CURR:DATA <current>
6. Power supply calculates and stores calibration constants.
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Calibration
Exit calibration mode
Exit calibration mode
When you have completed calibration, exit calibration mode by sending the
command:
CAL:STAT OFF, "0000"
where “0000” is replaced with your security code.
Restore Factory Calibration
Restore the unit to the calibration constants set at the factory by sending the
command:
CALibration:RESTore
Note This procedure should not be used in place of regular calibration, but may be useful to
restore the unit to an operational state in case of failure.
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Calibration
Restore Factory Calibration
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Xantrex Technology Inc.
8999 Nelson Way
Burnaby, British Columbia
Canada V5A 4B5
604 422 8595 Tel
604 421 3056 Fax
800 667 8422 Toll Free North America
www.xantrex.com
PRINTED IN CANADA
TM-MCOP-01XN
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