Verification 11
Measurement Techniques
Setup for Most Tests
Most tests are performed at the rear terminals of the supply as shown in Figure 2-1. Measure the DC voltage directly at the
+S and -S terminals. Set the output for remote sensing and use adequate wire gauge for the load leads as described in
Chapter 4 of the Operating Manual.
Note All tests are performed as follows: Set the SENSE switch at the back of the supply to the Remote position.
Connect the remote sensing leads from +OUT to +S, and from -OUT to -S.
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 must 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 in this chapter. 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 Chapter 3 of the Operating Manual.
b. Perform the Voltage Programming and Readback Accuracy test, and the Current Programming and Readback Accuracy
Performance test which are given in this chapter.
Performance Tests
Note A full Performance Test consists of those items listed as Specifications in Table 1-1 of the Operating
Manual, that have a procedure in the Verification section of this chapter.
The following paragraphs provide test procedures for verifying the supply’s compliance with the specifications listed in
Table 1-1 of the Operating Manual. All of the performance test specifications are listed in the appropriate Performance Test
Record Form for your specific model. You can record the actual measured values in the column provided in this form.
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