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Verification and Performance Tests - 2
13
Electronic Load
Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variable
resistor is used, switches should be used to either; connect, disconnect, or short the load resistor. For most tests, an
electronic load can be used. The electronic load is considerably easier to use than load resistors, but it may not be
fast enough to test transient recovery time and may be too noisy for the noise (PARD) tests.
Fixed load resistors may be used in place of a variable load, with minor changes to the test procedures. Also, if
computer controlled test setups are used, the relatively slow (compared to computers and system voltmeters) settling
times and slew rates of the power supply may have to be taken into account. "Wait" statements can be used in the test
program if the test system is faster than the supply.
Current-Monitoring Resistor
To eliminate output-current measurement error caused by voltage drops in the leads and connections, connect the
current monitoring resistor between the -OUT and the load as a four-terminal device. Connect the current-monitoring
leads inside the load-lead connections directly at the monitoring points on the resistor element.
Operation Verification Tests
To assure that the supply is operating properly, without testing all specified parameters, perform the following test
procedures:
a. Perform the turn-on and checkout procedures given in the Operating Manual.
b. Perform the Voltage Programming and Readback Accuracy test, and the Current Programming and Readback
Accuracy tests from this procedure.
Performance Tests
NOTE: A full Performance Test consists of only those items listed as “Specifications” in Table A-1 of the
Operating Manual, and that have a procedure in this document.
The following paragraphs provide test procedures for verifying the supply's compliance with the specifications listed
in Table A-1 of the Operating Manual. All of the performance test specifications and calculated measurement
uncertainties are entered in the appropriate Performance Test Record Card for your specific model. You can record
the actual measured values in the column provided in this card.
If you use equipment other than that recommended in Table 2-1, you must recalculate the measurement uncertainties
for the actual equipment used.
Programming
You can program the supply from the front panel keyboard or from a GPIB controller when performing the tests. The
test procedures are written assuming that you know how to program the supply either; remotely from a GPIB
controller or locally using the control keys and indicators on the supply's front panel. Complete instructions on
remote and local programming are given in the User’s Guide and in the Programming Guide. Programming ratings
are as follows: