Xantrex Technology Power Supply GPIB XPD User Manual
GPIB-XPD  
Operating Manual  
Internal GPIB Interface  
for XPD Series  
Programmable DC  
Power Supply  
 
Operating Manual for  
Internal GPIB Interface  
for XPD 500 Watt Series  
Programmable DC  
Power Supply  
 
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 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:  
[email protected]  
ii  
Operating Manual for GPIB for XPD Series Power Supply  
 
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 1.2  
iii  
 
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.  
iv  
Operating Manual for GPIB for XPD Series Power Supply  
 
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 1.2 (2002-06)  
Copyright  
2002 Xantrex Technology Inc. All rights reserved.  
©
Printed in Canada  
Release 1.2  
v
 
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.  
vi  
Operating Manual for GPIB for XPD Series Power Supply  
 
About This Manual  
This technical manual is for the internal GPIB interface, a microprocessor-controlled  
option card for XPD Series DC output power supplies. 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 Goes through basic setup  
procedures. Describes inspection, cleaning, shipping, and storage procedures.  
Includes additional options for configuring the GPIB interface for operation.  
Section 3 Operation Lists the complete command set, status registers, and error  
codes.  
Section 4 Calibration Provides detailed procedures for voltage and current  
mode calibration as well as over voltage protection (OVP) calibration. Includes  
calibration for programming and readback accuracy.  
Manual Revisions  
The current release of this manual is listed below. Updates may be issued as an  
addendum.  
Release 1.2 (2002/06)  
Release 1.2  
vii  
 
 
About This Manual  
viii  
Operating Manual for GPIB for XPD Series Power Supply  
 
Contents  
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii  
Section 1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Features and  
Specifications  
Features and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Programmable Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Readback Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Section 2. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Installation  
and  
Configuration  
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Basic Setup Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
IEEE-488 Primary Address Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Power On Service Request (PON SRQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
Remote/Local Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
Remote/Local Mode Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
Remote Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
Local Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
IEEE-488 Controller Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
Internal PCB Jumper Selections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
OVP Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
TTL Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
User Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
Connector J21 User Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
J21 Cable Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
Section 3. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  
Operation  
GPIB Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  
Multiline Control Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
Device Clear. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
Device Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
Parallel Poll . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
Service Request. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
Serial Poll. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
Command Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
Manual Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
Command Format and Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
Command Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35  
Command Terminators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35  
Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35  
Command Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39  
Accumulated Status, Status, and Fault Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . 46  
Release 1.2  
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Contents  
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48  
Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48  
Section 4. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49  
Calibration  
Voltage Mode Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50  
Voltage Calibration Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50  
Voltage Program Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50  
Voltage Readback Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50  
Current Mode Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52  
Current Calibration Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52  
Current Program Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52  
Current Readback Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53  
Over Voltage Protection (OVP) Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54  
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Operating Manual for GPIB for XPD Series Power Supply  
 
Section 1. Features and Specifications  
Description  
The internal GPIB interface card allows you to operate your power supply from a  
computer controller via the IEEE-488 communications bus. See Figure 1.1, “Sample  
Configuration using GPIB Interface”.  
The GPIB interface allows complete remote programming of your power supply,  
including status reporting, settings query, and interrupt generation with  
user-designated fault conditions. Both the voltage and current output are precisely  
programmed directly in volts and amps with 16-bit resolution. Additionally, the  
built-in DVM and current shunt measure the actual power supply output and provide  
you with 16-bit readback. The programming command set is easy-to-use and  
includes software calibration commands. The interface card comes standard with  
several protection features such as programmable over voltage protection, foldback,  
load isolation signal, and soft limits.  
Figure 1.1 Sample Configuration using GPIB Interface  
Release 1.2  
11  
 
       
Features and Specifications  
Features and Functions  
Features and Functions  
Features • 16-bit programming and readback of voltage and current  
•
•
•
•
Programmable soft limits for voltage and current  
Programmable over voltage protection with reset  
Easy-to-use, self-documenting command set  
Isolated user-programmable signals such as fault, polarity, isolation, and  
auxiliary signals  
•
LED status signals: error, addressed, service request, over voltage protection,  
and remote operation  
•
•
•
Foldback in CV or CC mode with reset  
Local Lockout capability  
Software calibration  
Programmable  
Functions  
•
•
•
•
•
•
•
Output voltage and current  
Soft limits for voltage and current  
Overvoltage protection  
Output enable/disable  
Maskable fault interrupt  
Hold and trigger  
User-programmable output relay signals  
Readback • Actual measured voltage and current  
Functions  
•
•
•
•
•
•
•
•
Voltage and current settings  
Soft voltage and current limits  
Overvoltage protection setting  
Present and accumulated power supply status  
Programming error codes  
Fault codes  
Power supply model and version identification  
Firmware revision levels  
12  
Operating Manual for GPIB for XPD Series Power Supply  
 
       
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 XPD 500 W Series Supply with GPIB Interface Installed  
Models  
7.5-67  
18-30  
33-16  
60-9  
120-4.5  
Program Resolution  
Voltage  
Current  
1.2mV  
5.2mA  
1.2mV  
4.6mV  
3.6mA  
4.6mV  
5.1mV  
2.9mA  
5.1mV  
9.3mV  
1.3mA  
9.3mV  
18.6mV  
0.7mA  
18.6mV  
OVP  
Program Accuracy1  
Voltage  
10mV  
75mV  
75mV  
150mV  
±0.3%  
80mA  
±0.15%  
600mV  
180mV  
±0.25%  
80mA  
±0.1%  
1.2V  
±0.12%  
250mA  
±0.1%  
80mV  
±0.12%  
140mA  
±0.1%  
200mV  
±0.12%  
115mA  
±0.15%  
330mV  
Current  
OVP  
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.  
Release 1.2  
13  
 
 
Features and Specifications  
Specifications  
14  
Operating Manual for GPIB for XPD Series Power Supply  
 
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  
Computer-based communications software package  
We usually install the GPIB interface in a power supply at the factory. Your local  
distributor or service center can also install the interface, especially for use in a  
previously-purchased supply already on site. You must then configure the GPIB  
Interface-enhanced supply for your system using the “Basic Setup Procedure” on  
page 19. Refer also to Figure 2.1, pg. 16, Figure 2.2, pg. 17 and Figure 2.3, pg. 18  
for drawings of the front panel, the interface subplate, and the GPIB interface printed  
circuit board (PCB).  
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 physical check.  
•
Ensure each package contains a power supply with its GPIB interface board  
installed, and manuals for the power supply and the GPIB 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.  
Release 1.2  
15  
 
     
Installation and Configuration  
Initial Inspection  
CAUTION  
!
Use proper static control techniques to avoid damage to static-sensitive components  
on the printed circuit board.  
Service Request LED (SRQ)  
Comes on at power up if the PON SRQ  
switch is set to on. You can enable the  
SRQ LED during normal operation with  
the SRQ command.  
Remote LED (REM)  
Figure 2.1 Power Supply Front Panel with GPIB Interface Installed  
16  
Operating Manual for GPIB for XPD Series Power Supply  
 
 
Installation and Configuration  
Initial Inspection  
S1 Switch  
Address LED (ADR)  
Indicates that the unit is  
being addressed by the  
master controller.  
1 Remote/Local Startup  
2 Power On Service Reques  
(Enable/Disable)  
3 Not Used  
4-8 Primary Address  
Selection (A1-A5)  
Error LED (ERR)  
Indicates that a programming  
error has occurred. Clear with  
error query command.  
Switch Position  
Reference markings  
(0) (1)  
IEEE 488 Connector  
J21 User Signal  
Connector  
Figure 2.2 GPIB Interface Subplate  
(Located on Power Supply Rear Panel)  
CAUTION  
!
Use proper static control techniques to avoid damage to static-sensitive components  
on the printed circuit board  
Release 1.2  
17  
 
 
Installation and Configuration  
Initial Inspection  
JUMPER SELECTION  
J2  
J3  
Local OVP control selection  
[closed] [default]. See page 23.  
[open] Front Panel OVP Control.  
User TTL shutdown (S/D) selection  
[1-2] User TTL S/D line active low.  
See page 27.  
[2-3] [default] User TTL S/D line active high.  
J20  
Remote OVP Control Selection  
[closed] [default]. See page 23.  
[open]  
Note: All other jumpers are not user-selectable.  
LED INDICATORS  
D1  
D4  
D5  
Red Diagnostic LED  
Red Diagnostic LED  
Green Diagnostic LED  
Bus error or soft restart on Slave circuitry.  
Soft restart on Master circuitry.  
Bus error on Master circuitry.  
See page 48.  
EPROMS  
U18  
U1  
Slave EPROM  
Master EPROM  
See revision number stamped on EPROM.  
See revision number stamped on EPROM.  
Figure 2.3 GPIB Interface PCB  
18  
Operating Manual for GPIB for XPD Series Power Supply  
 
   
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 interface as installed in the DC power  
supply. For those who want more information, each step refers to more detailed  
procedures located in subsequent sections. Execute each step of the procedure in the  
sequence given.  
Table 2.1 Setup Procedure  
Step # Description Action  
Reference  
1
PrimaryAddress Use GPIB interface rear panel switches See “IEEE-488 Primary Address  
Selection  
A1 to A5 to select a unique primary  
address. Setting the address identifies  
the power supply to the computer  
controller in a GPIB system.  
Selection” on page 20  
2
3
4
5
PON SRQ  
Selection  
Use the rear panel SRQ switch to select See “Power On Service Request  
the state of the Power ON Service  
Request  
(PON SRQ)” on page 21  
Remote/Local  
Operation  
Use the rear panel PON REM switch to See “Remote/Local Operation” on  
select remote or local startup of the  
power supply.  
page 21  
IEEE-488  
Controller  
Connection  
Connect the IEEE-488 bus to the supply See “IEEE-488 Controller  
at connector J8.  
Connection” on page 23  
Power ON  
Power on the unit. Before proceeding,  
check to ensure that the green REM  
LED on the front panel is on.  
See “Internal PCB Jumper  
Selections” on page 23 and “User  
Signals” on page 25 for information  
about Local/Remote OVP, TTL  
Shutdown, and auxiliary connector  
J21 user signals.  
6
7
Configure  
Computer  
Controller  
Configure the controller to match the  
power supply identification and  
characteristics using one of the available National Instruments. This program  
programs. is used here as an example only.  
One such program is IBCONF  
(Interface Bus Configuration) from  
Test  
Test the link by communicating with the Example: VSET2;ISET1  
power supply. This command string sets power  
supply voltage to 2V and its current  
limit to 1A.  
Example: ibwrt "vset2;iset1" As  
above, using IBIC. *  
*
This text uses National Instruments' IBIC (Interface Bus Interactive Control) program commands  
developed for their GPIB interface for computer controllers as examples only.  
Release 1.2  
19  
 
 
Installation and Configuration  
IEEE-488 Primary Address Selection  
IEEE-488 Primary Address Selection  
1. Assign a primary address to each power supply: Choose a number between 0 and  
30 which is unique to your IEEE-488 bus, that is, different from other device  
addresses on the same bus.  
2. Locate switch S1 on the GPIB interface rear panel. See “GPIB Interface  
Subplate” on page 17 for the interface subplate drawing.  
3. Use switch positions A1 to A5 to set the primary address for the power supply.  
See Table 2.2, “IEEE-488 Primary Address Selection”.  
Switch 0 = (OFF, OPEN) Switch 1 = (ON, CLOSED)  
Table 2.2 IEEE-488 Primary Address Selection  
Address  
A5  
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
A4  
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
A3  
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
A2  
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
A1  
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Address  
16  
A5  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
A4  
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
A3  
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
A2  
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
A1  
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
17  
2
18  
3
19  
4
20  
5
21  
6
22  
7
23  
8
24  
9
25  
10  
11  
12  
13  
14  
15  
26  
27  
28  
29  
30  
Note: Ensure you assign one address to each GPIB controller board as well.  
20  
Operating Manual for GPIB for XPD Series Power Supply  
 
   
Installation and Configuration  
Power On Service Request (PON SRQ)  
Power On Service Request (PON SRQ)  
The Power ON Service Request (SRQ) switch is located on the GPIB subplate rear  
panel S1 switch. Enabling the SRQ switch causes the power supply to send a service  
request to the computer controller when the power supply is turned on or when it  
re-initializes after a momentary power interrupt. When the PON SRQ state is tripped,  
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 “Command Reference” on page  
39 for information about the SRQ command. Table 2.3 shows the condition of the  
SRQ switch in relation to the position reference markings on the rear panel subplate.  
The location of the switch and reference markings can be found in Figure 2.2, “GPIB  
Interface Subplate” on page 17.  
Table 2.3 SRQ Switch Selection  
Rear Panel SRQ Switch Position PON SRQ State  
0
1
PON SRQ Enabled  
PON SRQ Disabled  
Remote/Local Operation  
Remote/Local Start the power supply either in local mode or in remote mode by setting the power  
ON remote (PON REM) switch which is located on the unit’s rear panel. See  
Table 2.4 for the switch settings  
Mode Startup  
Table 2.4 Remote/Local Start-up Settings.  
Switch Position  
Power ON results  
Unit in remote mode  
Unit in local mode  
0
1
With the rear panel PON REM switch set to 0, the power supply will start up in  
remote mode. The green REM LED on the front panel will turn on, signaling that the  
power supply is under the control of the digital interface card. The output of the  
power supply is active on startup. See Table 2.5 for more information. To promote  
load safety, power ON defaults are zero for the output voltage and current limit, and  
110% of maximum output voltage for the OVP trip point. See Section 3, “Operation”  
for more information about the interface commands listed in the table.  
Release 1.2  
21  
 
           
Installation and Configuration  
Remote/Local Operation  
If the rear panel PON REM switch is set to 1, the power supply will power up in  
local mode. Power supply control is at the front panel. During an operating  
session, you can toggle between local mode and remote mode by sending  
commands as described in “Remote Mode Operation” on page 22 and “Local  
Mode Operation” on page 23.  
Table 2.5 Remote Mode Power On Conditions  
Condition  
Voltage  
Default Settings  
7.5-140 Model Example  
VSET 0  
0 V  
Current  
0 A  
ISET 0  
Soft Voltage Limit  
Soft Current Limit  
OVP Trip Voltage  
Delay  
VMAX (see models)  
VMAX 7.5  
IMAX (see models)  
IMAX 140  
Model VMAX + 10%  
OVSET 8.25  
DLY 0.5S  
0.5 s  
OFF  
ON  
Foldback Protection  
Output  
FOLD OFF  
OUT ON  
Hold  
OFF  
NONE  
OFF  
OFF  
OFF  
HOLD OFF  
UNMASK NONE  
SRQ OFF  
Unmask  
Service Request Capability  
AUXA  
AUXA OFF  
AUXB OFF  
AUXB  
Remote Mode  
Operation  
While in remote mode, use the interface commands to control the output of the  
power supply from a computer. See Section 3, “Operation” for a complete list of  
device-dependent commands available with this interface. For information about  
how to use GPIB commands and GPIB lines, refer to the documentation for the  
particular GPIB controller interface installed on your computer.  
While in remote mode, you can change to local mode operation by sending the  
GPIB GTL (Go to Local) command, or by negating the GPIB REN (Remote  
Enable) line.  
22  
Operating Manual for GPIB for XPD Series Power Supply  
 
   
Installation and Configuration  
IEEE-488 Controller Connection  
To return to remote mode, ensure that the REN line is asserted and then send any  
valid GPIB or device-dependent command.  
Local Mode  
Operation  
In local mode operation, the voltage and current output levels and the OVP trip  
level are set with controls located on the front panel. Refer to the operating manual  
for a description of the functions available at the front panel.  
While in local mode operation, you can change power supply control to remote  
mode by ensuring that the GPIB REN line is asserted and then sending any  
software command to get into remote mode and the OUT ON command to restore  
the output. You can return to local mode by sending the GPIB GTL command or  
negate the REN line.  
Example:  
ibfind "devname"  
Address the unit (devname or device name as  
configured originally with ibconf).  
Set unit to local mode.  
ibloc  
ibwrt"id?"  
Any message to the unit now puts it back to  
remote mode.  
Toggle back to local mode.  
ibloc  
IEEE-488 Controller Connection  
Use an approved IEEE-488 connector and cable when connecting the power  
supply’s GPIB interface to your IEEE-488 GPIB network. The IEEE-488  
connector uses mating connector J8 on the rear panel of the power supply.  
Internal PCB Jumper Selections  
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.  
You can select how you use OVP (over voltage protection) control and TTL  
shutdown by changing jumper positions on the GPIB PCB. Refer to the operating  
manual for information on how to use over voltage protection and TTL shutdown.  
OVP  
Selection  
Over voltage protection (OVP) on the GPIB interface is set at the factory for  
remote software operation. When operating the power supply in remote mode, you  
control the OVP trip level using the OVSET software command. If you return the  
power supply to local operation by using the GPIB software commands or the by  
Release 1.2  
23  
 
       
Installation and Configuration  
Internal PCB Jumper Selections  
the front panel LOCAL switch, control of the OVP trip level changes from  
software control to the front panel OVP potentiometer. The default OVP trip level  
is set as 110% of the power supply's rated output voltage. See Table 2.5, on page  
22 for a complete list of remote power ON default settings.  
You can isolate the location of OVP control by changing the positions of the Local  
OVP Control jumper J2 and the Remote OVP Control jumper J20. The default  
jumper settings allow control of OVP to depend on the operating state of the power  
supply. By physically changing the jumper settings, you can isolate the location of  
OVP control to software control only or front panel control only. Table 2.6, “OVP  
Control Mode Selection” shows a table of jumper settings and OVP programming  
selection. Refer to “Basic Setup Procedure” on page 19 for the positions of the  
jumpers on the GPIB PCB.  
Table 2.6 OVP Control Mode Selection  
PCB Jumper J2 PCB Jumper  
Position J20 Position  
OVP Programming Selection  
Closed (default) Closed (default) Software or Front Panel OVP control  
(dependent on the power supply operating state)  
Closed  
Open  
Open  
Open  
Closed  
Open  
Software OVP control only  
Front Panel OVP control only  
Front Panel OVP control only  
TTL  
Shutdown  
You can use the Shutdown function to disable or enable the supply's output.  
Disabling the supply using TTL shutdown allows you to make adjustments to the  
load or to the power supply without shutting down the power supply. With the  
GPIB interface installed, TTL shutdown is activated by a TTL signal to Pin 1 of the  
J21 connector on the interface subplate. The shutdown user line uses a 0-5Vdc TTL  
input with a high signal range of 2.2-5.0Vdc. The current range of the shutdown  
line is 1-10mA. See Figure 2.5, “J21 User Signal Connector Circuit Block  
Diagram” on page 27 for a schematic of the J21 connector containing the shutdown  
user line.  
You can select the logic level of the TTL input by changing the J3 connector on the  
GPIB PCB. Table 2.7 shows the TTL signal levels for the J3 jumper settings. See  
Figure 2.2-3 for the location of the J3 jumper on the printed circuit board.  
24  
Operating Manual for GPIB for XPD Series Power Supply  
 
   
Installation and Configuration  
User Signals  
Table 2.7 Switch Settings for TTL Shutdown Circuit Logic  
PCB Jumper J3 Position  
TTL Signal Level Supply Output Condition  
Pin 2 to Pin 3 (default)  
HIGH  
LOW  
OFF  
ON  
Pin 1 to Pin 2  
HIGH  
LOW  
ON  
OFF  
User Signals  
Connector  
J21 User  
Signals  
Auxiliary connector J21, located on the GPIB interface rear panel, provides several  
signals to increase your operating control of the supply. These signals are  
dependent on the operator's design and uses. The operation of the J21 signal  
requires that you provide external Vcc and ground. Use a standard 8-position  
telephone jack and data cable to connect to J21. To locate the connector, refer to  
the GPIB interface subplate drawing in Figure 2.2, on page 21. See Figure 2.4,  
“User Signals J21 Connector” on page 26 for pin descriptions. The J21 outputs can  
sink a current of 5mA each. Figure 2.5, “J21 User Signal Connector Circuit Block  
Diagram” on page 27 shows the portion of the option board schematic which  
contains the J21 connector. Use the schematic as a reference when making input or  
output connections.  
Release 1.2  
25  
 
     
Installation and Configuration  
User Signals  
J21-1 External TTL shutdown input signal  
(See “TTL Shutdown”)  
J21-2 Polarity signal, open collector  
(asserted by VSET -x)  
J21-3 Isolation signal, open collector  
(asserted by OUT OFF)  
J21-4 Fault signal, open collector  
J21  
(asserted when bit set in fault register)  
J21-5 External Vcc, 15V maximum  
(supplied by connecting and operating an external source)  
J21-6 External ground and shutdown return  
(supplied by connecting and operating an external source)  
J21-7 Open collector user signal  
(asserted by AUXA ON)  
J21-8 Open collector user signal  
(asserted by AUXB ON)  
Figure 2.4 User Signals J21 Connector  
26  
Operating Manual for GPIB for XPD Series Power Supply  
 
 
Installation and Configuration  
User Signals  
Figure 2.5 J21 User Signal Connector Circuit Block Diagram  
J21 Cable  
Connection  
Use a standard 8-position telephone jack and data cable to connect to J21. 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") from the power supply end of the  
J21 user cable.  
2. Open the ferrite block housing.  
3. Loop the cable through the ferrite block. See Figure 2.6, “J21 User Cable with  
Ferrite Block” on page 28.  
4. Close the housing clip.  
The ferrite block ensures that the power supply system meets radiated emission  
requirement 89/336/EEC for CE mark approval. See the power supply's operating  
manual for noise specifications.  
Release 1.2  
27  
 
   
Installation and Configuration  
User Signals  
J21 User Cable  
Ferrite Block  
To J21 Connector  
To User Custom Interface  
Figure 2.6 J21 User Cable with Ferrite Block  
28  
Operating Manual for GPIB for XPD Series Power Supply  
 
 
Section 3. Operation  
Introduction  
This section covers GPIB interface programming, starting with IEEE-488 functions,  
continuing with an extensive set of device-dependent commands, and, finally,  
providing error codes, and status and fault register information.  
GPIB Operation  
A GPIB interface controller card enables you to control an IEEE-488 bus system via  
computer, identifying which of its interconnected devices are to send and receive  
data. Interconnected devices could include programmable AC or DC power supplies,  
oscilloscopes, signal generators, digital voltmeters, universal counters, readouts,  
relays, and printers.  
Use the GPIB interface to relay GPIB instructions from a computer controller to a  
power supply located at a selected IEEE-488 address and then to return responses  
from the power supply to the computer. You will also use the computer controller to  
issue device-dependent commands such as output voltage level and status queries.  
Note: This text employs National Instruments' IBIC (Interface Bus Interactive  
Control) program commands developed for their GPIB interface for computer  
controllers as examples only.  
Release 1.2  
29  
 
       
Operation  
GPIB Operation  
Table 3.1 IEEE-488.1 Interface Functions Implemented  
Mnemonic Capability  
Description  
SH1  
AH1  
Source Handshake  
Device must properly transfer a multiline message.  
Multiline  
Control  
Acceptor Handshake  
Device must properly receive remote multiline  
messages.  
Functions  
T6  
Talker  
Device must be able to transmit.  
L4  
Listener  
Device must receive commands and data.  
DC1  
Device Clear  
Device can be initialized to a previously determined  
state.  
Interface  
Functions  
DT1  
Device Trigger  
A device function can be initiated by a talker on the  
bus.  
E1  
Open Collector Drivers Describes the type of electrical drivers in a device.  
PP1  
Parallel Poll  
Upon controller request, device must uniquely  
identify itself if it requires service.  
RL1  
SR1  
SP1  
Remote/Local  
Service Request  
Serial Poll  
Device must be able to operate from front panel and  
via remote information from bus.  
Device can asynchronously request service from  
controller.  
All talkers on the bus assume a serial poll mode.  
Each device when addressed will provide an 8-bit  
word of status information.  
Multiline The GPIB interface and the computer controller implement the Acceptor Handshake,  
Source Handshake, Listener, and Talker functions. No user action is required. The  
unit's ADR (Addressed) LED turns on when the power supply is addressed to listen  
or talk.  
Control  
Functions  
Device Clear The power supply will implement Device Clear regardless of whether it is in local or  
remote control. Device Clear is typically used to send all or selected devices to a  
known state with a single command. The power supply will be set to Initial (Power  
On) Conditions after Device Clear.  
Example:  
ibfind "devname"  
Address the unit (devname or device name as  
configured originally with ibconf)  
ibclr  
Low level command directed to entire bus, or  
ibwrt"clr"  
Device-dependent command directed to a  
specific device.  
30  
Operating Manual for GPIB for XPD Series Power Supply  
 
   
Operation  
GPIB Operation  
Device Device Trigger will implement the most recently programmed values whether the  
unit is in local or remote control. If the power supply is in local mode, the new values  
will be implemented when it is switched from local to remote control. Device  
Trigger is typically used to synchronize the operation of a number of addressed  
devices.  
Trigger  
Example: Use HOLD Command to set values to be executed when triggered. See  
“Command Reference” on page 39.  
Then use:.  
ibfind "devname"  
Address the unit (devname or device name as  
configured originally with ibconf)  
ibtrg  
Command directed to entire bus, or  
ibwrt"trg"  
Command directed to a specific device.  
Parallel Poll Parallel Poll allows the computer controller to determine quickly which of a number  
of instruments on the bus requested service. The parallel poll response corresponds  
to bit 7 of the serial poll status byte. Parallel Poll does not reset the service request.  
The power supply must be configured remotely to respond to a parallel poll with  
either a "1" or "0" on one of the DIO lines if the unit is requesting service.  
Example:  
ibrpp  
Conduct a parallel poll.  
Service Service request is a uniline message asserted by the power supply at power on and  
for fault conditions. Ten (10) power supply conditions are defined as faults: CV, CC,  
OV, OTP, SD, FOLD, ERR, ACF, OPF, and SNSP. See “Accumulated Status, Status,  
and Fault Registers” on page 46 for more information. Power ON (PON) can also be  
flagged in the fault register if the supply's rear panel power on service request  
(PON SRQ) switch is set to ON. See “Power On Service Request (PON SRQ)” on  
page 21.  
Request  
Enabling or disabling a condition from asserting service request does not affect the  
condition within the power supply, nor the external status indicators.  
Release 1.2  
31  
 
     
Operation  
GPIB Operation  
Serial Poll In a serial poll, the controller polls each device.  
Example:  
ibrsp  
Return serial poll byte.  
The power supply responds with a 8-bit status byte defined as follows:  
Table 3.2 Serial Poll Status Register  
Bit  
Decimal  
Description  
Reset By  
Position Weight  
0 (LSB)  
1
Fault - Set when any bit in the fault  
register is set by a fault condition in the  
supply. See also “Accumulated  
Status, Status, and Fault Registers”  
on page 46.  
FAULT? query to reset  
1
2
3
4
2
Not used  
Not used  
Not used  
4
8
16  
Ready - Set when power supply is  
ready to accept commands.  
Power supply, during  
command processing  
period  
5
32  
Error (ERR) - Set when ERR bit  
asserted in status register. See also  
“Accumulated Status, Status, and  
Fault Registers” on page 46.  
ERR? query  
6
64  
Request Service (SRQ) - Set when  
Serial Poll  
power supply requests service.  
7 (MSB) 128  
Power On (PON) - Set when unit  
CLR or Device Clear  
initializes at power on.  
32  
Operating Manual for GPIB for XPD Series Power Supply  
 
 
Operation  
Command Syntax  
Command Syntax  
Manual The manual uses these conventions when displaying command information. These  
characters are not part of the command but are used to denote parameters used with  
the command.  
Conventions  
< > (angle brackets)  
Angle brackets enclose a parameter. Do not include  
the angle brackets in the command line you send to  
the computer.  
/ (slash)  
Separates two alternative parameters. When a slash  
separates two parameters, you can use either  
parameter to achieve the same result.  
Example: <1/ON>  
Entering 1 or ON will achieve the same result.  
COMPUTER ENTRY  
Words typed on the computer are shown in Arial  
text, full capitals.  
Command The device-dependent language for the GPIB Interface consists of commands and  
parameters. A command is a one word code which either gives instructions to the  
interface or asks for information from the interface. A command may be followed by  
one or more parameters, a short code that changes the state of the power supply or  
the state of the bit register. Table 3.3, “Command Parameters” lists the parameters  
that affect the command set.  
Format and  
Parameters  
Format:  
COMMAND or  
COMMAND <parameter> or  
COMMAND <parameter>,<parameter>  
•
•
You can enter commands in upper or lower case lettering.  
Example: MASK FOLD = mask fold  
Do not further abbreviate command names or parameters.  
Example:  
MASK FOLD ≠ MK FOLD  
MASK FOLD ≠ MASK FD  
•
Use a space between the command and the first parameter. Any number of  
consecutive spaces is treated as one space. Numeric data may contain leading  
spaces. Embedded spaces between digits or between a digit and a decimal point  
are not accepted.  
Example:  
MASK FOLD = MASK  
VOUT 3.4 = VOUT  
FOLD  
3.4  
4
VOUT 3.4 ≠ VOUT 3.  
Release 1.2  
33  
 
     
Operation  
Command Syntax  
•
Use commas between parameters in those commands with more than one  
parameter, and between mnemonic parameters as in the MASK and UNMASK  
commands. Only one comma is allowed and it may be preceded or followed by  
any number of spaces.  
Example:  
MASK CV, OV, FOLD  
Table 3.3 Command Parameters  
Parameter  
Description  
Form  
<current>, <Ihi>, <Ilo>  
The current in amps or milliamps. If no unit is <float>  
given, the default unit is amps.  
<float>A  
<float>mA  
<time>  
The time in seconds or milliseconds. If no unit <float>  
is given, the default unit is seconds.  
<float>s  
<float>ms  
<voltage>, <Vlo>, <Vhi> The voltage in volts or millivolts. If no unit is  
given, the default unit is volts.  
<float>  
<float>V  
<float>mV  
<mnemonics>  
A combination of CV, CC, CV, OV, OT, SD,  
FOLD, ERR, PON, REM, ACF, OPF, and  
SNSP. See MASK and UNMASK commands  
in the command reference for use of the ALL  
and NONE parameters.  
See registers  
on page 46.  
<state>  
The state of a binary condition.  
<1/ON,  
0/OFF>  
Floating Point Number <float> Variables sent with command parameters are  
floating point numbers. Table 3.4 defines the structure of floating point numbers for  
use with the software commands.  
Table 3.4 Floating Point Numbers  
Floating Number Definition  
Example  
The floating point number has four significant fig-  
ures. It can be of either sign, positive or negative.  
1.234  
-1.234  
+1.234  
A floating point number can have one decimal point. 0.123  
1.2  
123.4  
Scientific Notation  
123.0E-1  
Use E or e after the number for a base ten exponent. 1.2E-1  
An integer of either sign must follow an exponent.  
10.00E+1  
34  
Operating Manual for GPIB for XPD Series Power Supply  
 
   
Operation  
Command Syntax  
Command If you send more than one command line, separate the commands with a semicolon.  
The semicolon may be preceded or followed by spaces.  
Strings  
Example:  
ISET 2.0A; VSET 5V  
ISET 2.0A; VSET 5V  
Command Terminators indicate the end of a command string and tell the power supply to  
execute the command. The termination character is LF (Line Feed).  
Terminators  
Format:  
COMMAND <parameter>; COMMAND <parameter>, <parameter><LF>  
Most computer controllers automatically send LF with output statements.  
Order You may send commands in any order, keeping in mind that only those commands  
received after a HOLD and before a TRG (trigger) will be released by the TRG  
command. In addition, only these commands received after a supply disable and  
before a RST (reset) or OUT ON command will be released by the RST command  
or the OUT command. Commands are executed in the order they are received.  
Release 1.2  
35  
 
     
Operation  
Command Summary  
Command Summary  
Use these commands to control the operation of the supply. They are listed here  
in order of function such as PROGRAMMING, QUERY, CALIBRATION, and  
STATUS commands. See “Command Reference” on page 39 for more detailed  
information about each command and its use.  
Table 3.5 Programming Commands  
Command Description  
AUXA  
AUXB  
CLR  
Selects the state of the AUXA output signal on the J21-7 connector.  
Selects the state of the AUXB output signal on the J21-8 connector.  
Initializes the power supply to its Power ON (PON) state.  
DLY  
Sets a programmable time delay which is executed by the supply  
before reporting fault conditions after a new output voltage or current is  
specified.  
FOLD  
HOLD  
IMAX  
Sets foldback mode for the supply.  
Enables or disables voltage/current setting hold mode for the supply.  
Sets an upper soft limit on the programmed output current for the  
supply.  
ISET  
Sets the output current of the supply in amps (default) or in milliamps.  
Enables or disables voltage/current output for the supply.  
OUT  
OVSET  
Sets the over voltage protection trip point for the supply in volts  
(default) or in millivolts.  
RST  
SRQ  
TRG  
Resets the supply to the present voltage and current settings if the  
output is disabled by OVP or foldback protection.  
Enables or disables the power supply's ability to generate a service  
request.  
Implements programmed voltage and current settings which had been  
in hold mode.  
VMAX  
VSET  
Sets an upper soft limit on the supply’s programmed output voltage.  
Sets the output voltage of the power supply in volts (default) or in  
millivolts.  
36  
Operating Manual for GPIB for XPD Series Power Supply  
 
 
Operation  
Command Summary  
Table 3.6 Query Commands  
Command Description  
AUXA?  
AUXB?  
CMODE?  
DLY?  
Asks for the state of the set value for the AUXA command  
Asks for the state of the set value for the AUXB command  
Asks for the power supply’s calibration mode status.  
Asks for the programmable time delay setting before the supply  
reports fault conditions.  
ERR?  
Asks for the most recent remote programming error which occurred in  
the supply since the last time the error query command (ERR?) was  
used.  
FOLD?  
HOLD?  
ID?  
Asks for the supply’s present foldback setting.  
Asks for the present hold mode setting.  
Asks for the power supply’s model name and master EPROM version.  
Asks for the supply’s soft current limit setting.  
IMAX?  
IOUT?  
ISET?  
OUT?  
OVSET?  
ROM?  
Measures the supply’s actual current output.  
Asks for the supply’s present output current limit setting.  
Asks for the present enabled/disabled status of the supply’s output.  
Asks for the supply’s present over voltage protection limit.  
Asks for the version number of the master and slave EPROMs on the  
interface PCB.  
SRQ?  
Asks for the present enabled/disabled status of the IEEE-488 Service  
Requests generated by the supply.  
VMAX?  
VOUT?  
VSET?  
Asks for the supply’s soft voltage limit setting.  
Measures the supply’s actual voltage output.  
Asks for the supply’s present output voltage setting.  
Release 1.2  
37  
 
Operation  
Command Summary  
Table 3.7 Calibration Commands  
Command Description  
CMODE  
IDATA  
IHI  
Places the supply into calibration mode.  
Calculates the slope and intercept for current programming.  
Sets the current output to the high calibration point.  
Sets the current output to the low calibration point.  
Calculates the slope and intercept for current readback.  
Sets the current output to the high readback point.  
Sets the current output to the low readback point.  
Calibrates the over voltage protection (OVP).  
ILO  
IRDAT  
IRHI  
IRLO  
OVCAL  
VDATA  
VHI  
Calculates the slope and intercept for voltage programming.  
Sets the voltage output to the high calibration point.  
Sets the voltage output to the low calibration point.  
Calculates the slope and intercept for voltage readback.  
Sets the voltage output to the high readback point.  
Sets the voltage output to the low readback point.  
VLO  
VRDAT  
VRHI  
VRLO  
Table 3.8 Status Commands  
Command Description  
ASTS?  
Asks for the supply’s accumulated status register.  
FAULT?  
Asks for the supply’s fault register for the status preset operating  
conditions.  
MASK  
Prevents the supply's previously unmasked operating conditions from  
setting bits in the fault register.  
STS?  
Asks for the supply’s present status register.  
UNMASK  
Enables you to select those supply's operating conditions that you are  
most interested in monitoring for fault occurrence.  
UNMASK? Asks for the supply's fault conditions which are currently enabled  
(unmasked).  
38  
Operating Manual for GPIB for XPD Series Power Supply  
 
 
Operation  
Command Reference  
Command Reference  
Table 3.9 Command Reference  
Command  
Description  
ASTS?  
Asks for the supply’s accumulated status register. The accumulated status  
register stores any bit that was entered in the status register since the  
accumulated status query command (ASTS?) was last used, regardless of  
whether the condition still exists. The accumulated status register has the  
same bits, weights, and conditions as the status register. A bit in the  
accumulated status register will be set at 1 if the corresponding bit in the  
status register has been 1 (TRUE) at any time since the register was last  
read. See “Accumulated Status, Status, and Fault Registers” on page 46.  
The ASTS? query clears the status register.  
Response: ASTS <status mask> where status mask is the decimal  
equivalent of the total bit weights for the operating conditions as listed in the  
status register.  
AUXA <1/ON>,<0/OFF>  
AUXA?  
Controls the AUXA output signal level at rear panel connector J21-7. Active  
low.  
Initial value: AUXA 0  
Asks for the present set value of the AUXA output signal.  
Response: AUXA 0 (OFF)  
AUXA 1 (ON)  
AUXB <1/ON>,<0/OFF>  
AUXB?  
Controls the AUXB output signal level at rear panel connector J21-8. Active  
low.  
Initial value: AUXB 0  
Asks for the present set value of the AUXB output signal.  
Response: AUXB 0 (OFF)  
AUXB 1 (ON)  
CLR  
Initializes the power supply to its power ON condition. If issued while in local  
mode, CLR will force power supply settings to register default values as in  
but these default settings will not come into effect until the power supply is  
switched to remote mode operation. The CLR commands will clear faults  
from the fault register. CLR will not reset CMODE.  
CMODE <1/ON>,<0/OFF> CMODE ON places the power supply into calibration mode for processing  
calibration commands.  
Initial value: CMODE OFF or CMODE 0  
CMODE?  
Asks for the power supply’s calibration mode status.  
Response: CMODE 0 (disabled)  
CMODE 1 (enabled)  
Release 1.2  
39  
 
   
Operation  
Command Reference  
Command  
Description  
DLY <seconds>  
Sets a programmable time delay employed by the supply before reporting  
fault conditions. The power supply uses the time delay after receiving a new  
output voltage or current setting via VSET or ISET, or after receiving RST,  
TRG, or OUT ON commands. During the time delay, the power supply  
disables CV, CC, and FOLD conditions from generating faults, preventing  
possible nuisance foldback if the supply momentarily switches modes while  
changing an output setting.  
Range: 0 to 32 seconds, with 32ms resolution  
Initial value: 0.5 second  
DLY?  
ERR?  
Asks for the setting of the programmable time delay before the supply  
reports fault conditions.  
Response: DLY <seconds>  
Asks for the most recent remote programming error. When the power  
supply detects a programming error, it lights the ERR LED and sets the  
ERR bit in the accumulated status and fault registers. If the error bit has  
been masked using the MASK command, then the ERR bit in the registers  
will not set. Once an error is detected, the remaining portion of the  
command line is discarded. An error query clears the ERR bit in the  
accumulated status register. See “Error Codes” on page 47.  
Response: ERR <error number> Example: ERR 0 (if no error)  
FAULT?  
Asks for the state of the fault register. A bit is set in the fault register when a  
fault arises for that condition. Lists the conditions which activate a fault bit.  
You can use the MASK command to disable bits from being set in the fault  
register.  
When a bit is set in the fault register it also asserts a signal on the J21-4  
user signal line. You can tie the J21-4 fault line signal to the power supply's  
own External Shutdown user line, J21-1, so that the shutdown signal goes  
low (active) in the case of a user-defined fault.  
The FAULT? query clears bits in the supply's fault register and fault line.  
Response: FAULT <fault mask> where fault mask is the decimal equivalent  
of the total bit weights for the operating conditions as listed in the fault  
register. See “Accumulated Status, Status, and Fault Registers” on page  
46.  
FOLD  
<2/CC>, <1/CV>,  
<0/OFF>  
Sets foldback mode for the supply. Foldback protection disables the power  
supply output when the output enters the fold condition. Reset with the RST  
command.  
Example: Specify FOLD 1 or FOLD CV (Constant Voltage) when you want  
the supply to operate in Constant Current mode and have foldback  
protection disable the output if the supply switches to Constant Voltage  
mode.  
Initial value: FOLD 0/OFF  
40  
Operating Manual for GPIB for XPD Series Power Supply  
 
Operation  
Command Reference  
Command  
Description  
FOLD?  
Asks for the supply’s present foldback setting.  
Response: FOLD <mode> where mode is:  
0 (OFF) or  
1 (CV or Constant Voltage mode) or  
2 (CC or Constant Current mode)  
HOLD <1/ON>,<0/OFF>  
Enables or disables voltage/current setting hold mode for the supply. When  
HOLD ON is specified, hold mode is enabled so that all voltage and current  
settings which would normally be implemented by the supply are held until a  
TRG (trigger) command is received. This feature allows you to synchronize  
the operation of several supplies.  
Initial value: HOLD OFF or HOLD 0  
HOLD?  
Asks for the present hold mode setting.  
Response: HOLD 0 (OFF or disabled) or  
HOLD 1 (ON or enabled)  
ID?  
Asks for the power supply model and the master EPROM version.  
Response: ID <model name><version>  
IDATA <Ilo>,<Ihi>  
Calculates and records the slope and offset for programmed current using  
ILO and IHI data. Set CMODE ON before using this command. See also the  
calibration procedures in Section 4.  
<Ilo> and <Ihi> are in <current> format.  
IHI  
In response to this command, the power supply sends a programmed  
current value to the output terminal. This value is at the high end of the  
power supply’s current range and is read by an external device connected  
as part of the calibration procedure. Refer to this value as IHI and record it  
to use as input with the IDATA command. Set CMODE ON before using this  
command. See also the calibration procedures in Section 4.  
ILO  
In response to this command, the power supply sends a programmed  
current value to the output terminal. This value is at the low end of the  
power supply’s current range and is read by an external device connected  
as part of the calibration procedure. Refer to this value as ILO and record it  
to use as input with the IDATA command. Set CMODE ON before using this  
command. See also the calibration procedures in Section 4.  
IMAX <current>  
Sets an upper soft limit on the supply’s programmed output current. If the  
soft limit is exceeded, or if the soft limit value is lower than the present  
output current setting, the supply will ignore the command, turn on the  
ERR LED, and set the ERR bit in the bit registers.  
Range: 0 to model maximum output current (IMAX)  
Initial value: model IMAX  
IMAX?  
IOUT?  
Asks for the supply’s soft current limit setting.  
Response: IMAX <current>  
Measures the supply’s actual current output using the built-in current  
readback circuitry.  
Response: IOUT <current>  
Release 1.2  
41  
 
Operation  
Command Reference  
Command  
Description  
IRDAT <Ilo>,<Ihi>  
Calculates and records the slope and offset for readback voltage using  
IRLO and IRHI data. Set CMODE ON before using this command. See also  
the calibration procedures in Section 4.  
<Ilo> and <Ihi> are in <current> format.  
IRHI  
The power supply outputs a current value to an external device connected  
as part of the calibration procedure and records a current readback value  
internally. These values are at the high end of the programmed current  
range. Refer to the output value as IRHI and record it to use as input with  
the IRDAT command. Set CMODE ON before using this command. See  
also the calibration procedures in Section 4.  
IRLO  
The power supply outputs a current value to an external device connected  
as part of the calibration procedure and records a current readback value  
internally. These values are at the low end of the programmed current  
range. Refer to the output value as IRLO and record it to use as input with  
the IRDAT command. Set CMODE ON before using this command. See  
also the calibration procedures in Section 4.  
ISET <current>  
Sets the power supply’s output current in amps (default) or in milliamps.  
This programmed current is the actual output in CC mode or the current  
limit in CV mode.  
Range: 0 to model maximum output current (IMAX)  
Initial value: 0 amps  
ISET?  
Asks for the supply’s present output current setting. Does not apply to  
current settings which are being held. See HOLD command.  
Response: ISET <current>  
MASK <mnemonics>  
Disables the supply's previously unmasked operating conditions from  
setting bits in the fault and status registers. See “Accumulated Status,  
Status, and Fault Registers” on page 46. Mnemonics are separated from  
each other by commas and may be sent in any order.  
Mnemonics: CV, CC, OV, OT, SD, FOLD, ERR, PON, REM, ACF, OPF,  
SNSP  
Note: UNMASK NONE = MASK ALL (Initial value)  
MASK NONE = UNMASK ALL  
OUT <1/ON>,<0/OFF>  
Enables or disables the supply’s voltage/current output. The supply will  
continue to accept new commands while the output is disabled but these  
will not be implemented until OUT ON or OUT 1 is received. OUT ON is the  
default setting. When you start the supply in remote mode, the output is  
enabled.  
OUT OFF (or OUT 0) also sets the isolation signal on the rear panel J21  
connector, line 3. You can use the to trip external relays to isolate the power  
supply from the load.  
Initial value: OUT ON (or OUT 1) for output enabled  
OUT?  
Asks for the present enabled/disabled status of the supply’s output  
voltage/current.  
Response: OUT 1 output enabled or  
OUT 0 output disabled  
42  
Operating Manual for GPIB for XPD Series Power Supply  
 
Operation  
Command Reference  
Command  
Description  
OVCAL  
Causes the master controller to perform automatic calibration of the  
supply’s over voltage protection circuitry. Set CMODE ON before using this  
command. Ensure jumper J2 on the GPIB Interface PCB is connected for  
remote operation.  
OVSET <voltage>  
Sets the supply’s over voltage protection trip point in volts (default) or in  
millivolts. If the trip point is exceeded, or if the trip point value is lower than  
the present output voltage setting, the supply will ignore the command, turn  
on the ERR LED, and set the ERR bit in the accumulated status register.  
Reset with the RST command.  
Range: 0 to 110% of model maximum output voltage (VMAX)  
Initial value: 110% of model VMAX  
OVSET?  
ROM?  
Asks for the supply’s present over voltage protection limit.  
Response: OVSET <voltage>  
Asks for the version number of the master and slave EPROMs located on  
the interface PCB.  
Response: ROM M:<version> S:<version>  
RST  
Resets the supply to present voltage and current settings if the output is  
disabled by over voltage or foldback protection. Output values may be  
changed via VSET, ISET, and OVSET while the unit is disabled, but those  
values will not take effect until RST is applied.  
SRQ <1/ON>,<0/OFF>  
SRQ ON enables the supply to respond to a variety of fault conditions with a  
request for service to the IEEE-488 bus controller. With SRQ ON, the SRQ  
line will be asserted true whenever the FAU bit in the supply's serial poll  
register changes from 0 to 1. Therefore, the mask register, in addition to  
specifying which conditions set the FAU bit, also determines which  
conditions can generate service requests. Ten power supply conditions are  
defined as faults: CB, CC, OV, OTP, SD, ERR, FOLD, ACF, OPF, SNSP.  
Use the FAULT? query to discover which condition caused the service  
request. See “Accumulated Status, Status, and Fault Registers” on page  
46. A request for service at Power ON (PON SRQ) is set via a rear panel  
switch on the supply. See “Power On Service Request (PON SRQ)” on  
page 21. SRQ remains disabled until the FAULT bit in the serial poll register  
is cleared by a FAULT? query.  
SRQ?  
STS?  
Asks for the supply's present ability to generate service requests.  
Response: SRQ 0 (disabled)  
SRQ 1 (enabled)  
Asks for the supply’s present status register. Status conditions are stored in  
the status register. Each bit represents a separate condition. When the  
condition is true, the corresponding bit is 1 (true). Bits remain set in the  
status register as long as the condition is true. See “Accumulated Status,  
Status, and Fault Registers” on page 46.  
Response: STS <status mask> where status mask is the decimal equivalent  
of the total bit weights for the operating conditions as listed in the status  
register.  
Release 1.2  
43  
 
Operation  
Command Reference  
Command  
Description  
TRG  
Implements programmed voltage and current settings which had been in  
hold mode. The supply operates with previous values until the TRG (trigger)  
command is sent.  
UNMASK <mnemonics>  
Enables you to select the supply operating conditions that you are most  
interested in monitoring for fault occurrence. Mnemonics describing the  
conditions are separated from each other by commas, and may be sent in  
any order.  
Specifying one or more mnemonics which describe the conditions (or the  
decimal equivalent of their total bit weight) enables the selected conditions  
to set bits in the supply’s fault and status registers during operation. A bit is  
set in the fault register when the corresponding bit in the status register  
changes from 0 to 1 and the corresponding bit in the mask register is 1. See  
“Accumulated Status, Status, and Fault Registers” on page 46.  
Mnemonics: CV, CC, OV, OT, SD, FOLD, ERR, PON, REM, ACF, OPF,  
SNSP, ALL, NONE  
Initial value: UNMASK NONE  
UNMASK?  
Asks for the supply's fault conditions which are currently enabled  
(unmasked).  
Response: UNMASK <fault mask> where fault mask is the decimal  
equivalent of the total bit weights for the operating conditions as listed in the  
status and fault registers See “Accumulated Status, Status, and Fault  
Registers” on page 46.  
VDATA <Vlo>,<Vhi>  
VHI  
Calculates and records the slope and offset for programmed voltage using  
VLO and VHI data. Set CMODE ON before using this command. See also  
the calibration procedures in Section 4.  
<Vlo> and <Vhi> are in <voltage> format.  
In response to this command, the power supply sends a programmed  
voltage value to the output terminal. This value is at the high end of the  
power supply’s voltage range and is read by an external device connected  
as part of the calibration procedure. Refer to this value as VHI and record it  
to use as input with the VDATA command. Set CMODE ON before using  
this command. See also the calibration procedures in Section 4.  
VLO  
In response to this command, the power supply sends a programmed  
voltage value to the output terminal. This value is at the low end of the  
power supply’s voltage range and is read by an external voltmeter  
connected as part of the calibration procedure. Refer to this value as VLO  
and record it to use as input with the VDATA command. Set CMODE ON  
before using this command. See also the calibration procedures in  
Section 4.  
44  
Operating Manual for GPIB for XPD Series Power Supply  
 
Operation  
Command Reference  
Command  
Description  
VMAX <voltage>  
Sets an upper soft limit on the supply’s programmed output voltage. If the  
soft limit is exceeded, or if the soft limit value is lower than the present  
output voltage setting, the supply will ignore the command, turn on the  
ERR LED, and set the ERR bit in the accumulated status register.  
Range: 0 to model maximum output voltage (VMAX)  
Initial value: model VMAX  
VMAX?  
VOUT?  
Asks for the supply’s soft voltage limit setting.  
Response: VMAX <voltage>  
Measures the supply’s actual voltage output using the built-in voltage  
readback circuitry.  
Response: VOUT <voltage>  
VRDAT <Vlo>,<Vhi>  
VRHI  
Calculates and records the slope and offset for readback voltage using  
VRLO and VRHI data. Set CMODE ON before using this command. See  
also the calibration procedures in Section 4 .  
<Vlo> and <Vhi> are in <voltage> format.  
The power supply outputs a voltage value to an external voltmeter  
connected as part of the calibration procedure and records a voltage  
readback value internally. These values are at the high end of the  
programmed voltage range. Refer to the output value as VRHI and record it  
to use as input with the VRDAT command. Set CMODE ON before using  
this command. See also the calibration procedures in Section 4.  
VRLO  
The power supply outputs a voltage value to an external voltmeter  
connected as part of the calibration procedure and records a voltage  
readback value internally. These values are at the low end of the  
programmed voltage range. Refer to the output value as VRLO and record  
it to use as input with the VRDAT command. Set CMODE ON before using  
this command. See also the calibration procedures in Section 4.  
VSET <voltage>  
or  
VSET <-voltage>  
Sets the power supply’s output voltage in volts (default) or in millivolts. This  
programmed voltage is the actual output in CV (constant voltage) mode or  
the voltage limit in CC (constant current) mode.  
If you enter a negative voltage value, the power supply will assert a signal  
on the J21-4 user signal line. You can use the user signal to trip external  
relays to switch the output polarity.  
Range: 0 to model maximum output voltage (VMAX)  
Initial value: 0 volts  
VSET?  
Asks for the power supply’s present output voltage setting. Does not apply  
to voltage settings which are being held. See HOLD command.  
Response: VSET <voltage>  
Release 1.2  
45  
 
Operation  
Accumulated Status, Status, and Fault Registers  
Accumulated Status, Status, and Fault Registers  
The GPIB option card uses three separate registers which are always active. They  
are the accumulated status, status, and fault registers. You can use the status  
commands shown in Table 3.8, “Status Commands” to activate the registers. The  
bit register has twelve conditions, each assigned a bit weight. When querying a  
register, the controller returns a response which is the sum of the weights of all  
relevant conditions.  
Example:  
ASTS?  
Query the Accumulated Status register.  
Controller response.  
ASTS <771>  
771 = 512 + 256 + 2 + 1 = PON + REM + CC + CV  
Table 3.10 Accumulated Status, Status, and Fault Registers  
Condition  
Mnemonic Bit Position Bit Weight  
Constant voltage operation  
Constant current operation  
Not used  
CV  
0
1
2
3
4
5
6
7
8
1
CC  
2
–
4
Overvoltage protection tripped  
Over temperature protection tripped  
Supply external shutdown active (J21-1)  
Foldback mode operation  
Remote programming error  
OV  
8
OT  
16  
32  
64  
128  
256  
SD  
FOLD  
ERR  
PON  
Power ON (accumulated status, status  
registers only)  
Remote mode (accumulated status, status REM  
registers only)  
9
512  
AC fail condition  
ACF  
10  
11  
12  
1024  
2048  
4096  
Output fail condition  
Sense protection tripped  
OPF  
SNSP  
Notes:  
1. All mnemonics can be masked or unmasked.  
2. The error (ERR) bit is reset in the accumulated status, status, and serial poll registers with an  
error query (ERR?).  
3. The accumulated status register is cleared with an accumulated status query (ASTS?).  
4. A fault is cleared with a fault query (FAULT?).  
46  
Operating Manual for GPIB for XPD Series Power Supply  
 
 
Operation  
Error Codes  
Error Codes  
If the ERR flag in the accumulated status or fault registers has been activated, an  
ERR? query will return an error number which corresponds to an event described  
in the following table. The ERR? query will also clear the ERR bit in the register.  
Table 3.11 Error Codes  
ERROR # ERROR IDENTIFICATION  
EXPLANATION  
0
4
No Errors  
Unrecognized Character  
Improper Number  
Received a character such as @,*,$.  
Received a numeric character but the  
characters were not a proper number.  
Example: VSET,±10.3  
Unrecognized String  
Syntax Error  
Received an invalid command.  
Received an incorrectly placed word,  
number, separator, or terminator.  
Example: OFF SRQ, VOUT 6, MASK,  
ERR  
5
6
Number Out of Range  
Specified a value for the command  
which was outside of the allowed range.  
Attempt to Exceed Soft Limits Attempted to program a voltage or  
current greater than the soft limit.  
Example: VMAX 500; VSET 550 LF  
7
8
Improper Soft Limit  
Attempted to program a soft limit less  
than the output value.  
Data Requested without a  
Query Being Sent  
The controller requested data from the  
power supply without first sending a  
query command.  
9
OVP Set Below Output  
Sent an OVSET command with a trip  
value lower than the output voltage.  
10  
12  
Slave Processor Not  
Responding  
The interface PCB slave processor did  
not respond.  
Illegal Calibration  
Attempted calibration when the supply  
was not in calibration mode. See  
CMODE command.  
Release 1.2  
47  
 
 
Operation  
Troubleshooting  
Troubleshooting  
WARNING  
Exercise caution when using and servicing power supplies. High energy levels can  
be stored at the output voltage terminals on all power supplies in normal operation.  
In addition, potentially lethal voltages exist in the power circuit and the output  
connector of power supplies which are rated at 40V and over. Filter capacitors store  
potentially dangerous energy for some time after power is removed.  
Diagnostic  
LEDs  
This section describes the diagnostic LEDs found on the GPIB interface.  
Computer Operating Properly (COP) LEDs The GPIB interface provides  
three diagnostic LEDs, located at D5, D4, and D1 on its PCB. Refer to Figure 2.3,  
‘GPIB Interface PCB” on page 18, for their locations. At present, these LEDs turn  
on to signal COP events for the interface's microprocessors. Issue a RST (reset)  
command to turn off the diagnostic LEDs.  
The green COP LED at circuit designation D5 indicates that the GPIB interface  
microprocessor successfully recovered from an illegal operating code. The event is  
transparent to the GPIB communications bus and the GPIB interface continues to  
function normally.  
The red COP LED at D4 indicates that a transparent restart caused by noise in the  
master processor circuitry has occurred.  
The red COP LED at D1 indicates that a transparent restart caused by noise in the  
slave processor circuitry has occurred.  
48  
Operating Manual for GPIB for XPD Series Power Supply  
 
     
Section 4. Calibration  
Introduction  
WARNING  
Exercise caution when using and servicing power supplies. High energy levels can  
be stored at the output voltage terminals on all power supplies in normal operation. In  
addition, potentially lethal voltages exist in the power circuit and the output connector  
of power supplies which are rated at 40V and over. Filter capacitors store potentially  
dangerous energy for some time after power is removed.  
You can calibrate the GPIB interface by adjusting the signal levels on the interface  
card so that they correspond to the expected signal levels on the power supply's main  
assembly. You may need to recalibrate the interface if you replace parts either on the  
interface board or on the main power supply board, or if the unit falls out of  
specification due to component aging drifts.  
You can calibrate the GPIB Interface for:  
•
•
•
•
•
Voltage program  
Voltage readback  
Current program  
Current readback  
Overvoltage protection  
The following equipment will be required to accurately calibrate your unit:  
•
•
Digital Voltmeter, 5 1/2 digit, 0.1% accuracy or better, with test leads  
Current sensing shunt resistor, rated for 150% of maximum output current,  
0.25% accuracy or better  
•
•
Connection wires rated for the unit's maximum output current and voltage  
A GPIB equipped computer to send the calibration commands to the unit  
Calibrate the unit according to the following procedures, referring to “Command  
Reference” for more information about the calibration commands used.  
The calibration procedures in this section are designed to be performed at an ambient  
temperature of 25°C ± 5°C.  
Release 1.2  
49  
 
     
Calibration  
Voltage Mode Calibration  
Voltage Mode Calibration  
Voltage 1. Disconnect the load from the power supply which is to be calibrated.  
Calibration  
2. Connect a voltmeter across the power supply’s output terminals.  
Setup  
Power Supply  
Power Supply  
Positive Output  
Negative Output  
V
-
+
VOLTMETER  
Figure 4.1 Voltage Calibration Setup  
Voltage 1. Set the power supply for calibration as in Figure 4.1.  
Program  
Calibration  
Procedure  
2. Activate calibration mode by sending command CMODE ON or CMODE 1 to  
the power supply.  
3. Send command VLO; ILO to the power supply. Measure and record the output  
shown on the external voltmeter.  
4. Send command VHI; IHI to the supply. Measure and record the output voltage  
as shown on the external voltmeter.  
5. Send the command VDATA <vlo>,<vhi> where <vlo> and <vhi> are the values  
read from the voltmeter when the VLO and VHI commands were sent. When the  
power supply is calibrated, the low to high voltage program calibration values  
are stored as constants.  
6. Program the supply at various levels using the VSET command to confirm that  
the calibration was successful and that linearity is observed. See the voltage  
program accuracy specification in Section 1.  
7. Turn off calibration mode by sending the command CMODE OFF or CMODE 0  
to the power supply.  
Voltage 1. Set the power supply for calibration as in Figure 4.1.  
Readback  
Calibration  
Procedure  
2. Activate calibration mode by sending command CMODE ON or CMODE 1 to  
the power supply.  
50  
Operating Manual for GPIB for XPD Series Power Supply  
 
         
Calibration  
Voltage Mode Calibration  
3. Send command VRLO; IRLO to the power supply. Wait for the supply to settle.  
Measure and record the output shown on the external voltmeter. Send VRLO  
again.  
4. Send VRHI; IRHI to the supply. Wait for the supply to settle. Measure and  
record the output voltage shown on the external voltmeter. Send VRHI again.  
5. Send the command VRDAT <vlo>,<vhi> where <vlo> and <vhi> are the values  
read from the voltmeter after the VRLO and VRHI commands were sent. The  
processor calculates the offset value required to calibrate the power supply.  
When the power supply is calibrated, the low to high voltage readback  
calibration values (offsets) are stored as constants.  
6. Use commands VSET and VOUT? commands to confirm that the calibration  
was successful and that linearity is observed. Refer to the voltage readback  
accuracy specification in Section 1.  
7. Turn off calibration mode by sending the command CMODE OFF or CMODE 0  
to the power supply.  
Release 1.2  
51  
 
Calibration  
Current Mode Calibration  
Current Mode Calibration  
Current 1. Disconnect the load from the power supply to be calibrated.  
Calibration  
2. Connect a shunt across the supply's output terminals.  
Setup  
3. Connect a voltmeter across the shunt.  
Power Supply  
Power Supply  
Positive Output  
Negative Output  
Current Sensing  
Resistor  
V
-
+
VOLTMETER  
Figure 4.2 Current Calibration Setup  
Current 1. Connect the shunt and voltmeter to the power supply as shown in Figure 4.2.  
Program  
Calibration  
Procedure  
2. Activate calibration mode by sending command CMODE ON or CMODE 1 to  
the power supply.  
3. Send command ILO; VLO to the power supply. Measure and record the output  
shown on the external voltmeter.  
4. Send command IHI; VHI to the supply Measure and record the output voltage  
shown on the external voltmeter.  
5. Calculate ILO and IHI from the voltages read from the external voltmeter and  
the shunt resistance. I=V/R.  
6. Send the command IDATA <ilo>,<ihi> to the power supply. <ilo> and <ihi> are  
the current values obtained from sending the ILO and IHI commands to the  
power supply. When the power supply is calibrated, the low to high current  
program calibration values are stored as constants.  
7. Program the supply at various levels using the ISET command to confirm that  
the calibration was successful and that linearity is observed. Refer to the current  
program accuracy specification in Section 1.  
8. Turn off calibration mode by sending the command CMODE OFF or CMODE 0  
to the power supply.  
52  
Operating Manual for GPIB for XPD Series Power Supply  
 
       
Calibration  
Current Mode Calibration  
Current 1. Connect the current shunt and voltmeter to the power supply as shown in  
Readback  
Calibration  
Procedure  
Figure 4.2.  
2. Activate calibration mode by sending command CMODE ON or CMODE 1 to  
the power supply.  
3. Send command IRLO; VRLO to the power supply. Wait for the supply to settle.  
Measure and record the output voltage shown on the external voltmeter. Send  
IRLO again.  
4. Send command IRHI; VRHI to the supply. Wait for the supply to settle. Measure  
and record the output voltage shown on the external voltmeter. Send IRHI again.  
5. Calculate IRLO and IRHI from the voltages taken from the external voltmeter  
and the shunt resistance. I=V/R.  
6. Send the command IRDAT <ilo>,<ihi> to the power supply. <ilo> and <ihi> are  
the current values obtained from sending the IRLO and IRHI commands to the  
power supply. When the power supply is calibrated, the low to high current  
readback calibration values are stored as constants.  
7. Program the supply at various levels using the ISET command to confirm that  
the calibration was successful and that linearity is observed. Refer to the current  
readback accuracy specification in Section 1.  
8. Turn off calibration mode by sending the command CMODE OFF or CMODE 0  
to the power supply.  
Release 1.2  
53  
 
 
Calibration  
Over Voltage Protection (OVP) Calibration  
Over Voltage Protection (OVP) Calibration  
We recommend that you perform OVP calibration every six months. Connecting a  
digital voltmeter as in “Voltage Calibration Setup” is optional.  
1. Disconnect all loads from the power supply.  
2. Ensure that jumper J2 on the interface PCB is CLOSED to enable remote OVP  
calibration (Jumper J2 is closed at the factory). See for the location on the PCB  
of jumper J2.  
3. Activate calibration mode by sending command CMODE ON or CMODE 1 to  
the power supply.  
4. Send the command OVCAL to the power supply. The ADR LED will light  
during OVP calibration. Calibration is complete when the ADR LED turns off.  
This may take a few minutes.  
5. Use the OVSET, OVSET?, and VSET commands to trip the OVP level,  
confirming that the calibration was successful. When you trip the OVP level, the  
red OVP LED will light and the voltage will drop to zero. Send the command  
RST to clear the OVP condition. Refer to the OVP program accuracy  
specification in Section 1.  
6. Turn off calibration mode by sending the command CMODE OFF or CMODE 0  
to the power supply.  
54  
Operating Manual for GPIB for XPD Series Power Supply  
 
 
 
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  
[email protected]  
www.xantrex.com  
PRINTED IN CANADA  
TM-GPPD-01XN  
 

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