Programming; Constant Voltage (Cv) Tests; Cv Setup; Voltage Programming And Readback Accuracy - Agilent Technologies 6631B Service Manual

2 – Verification and Performance Tests

Programming

You can program the power 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 power
supply either; remotely from a GPIB controller or locally using the control keys and indicators on the power
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:
Model Full Scale
Voltage Rating
Agilent 8 V
6631B

Constant Voltage (CV) Tests

CV Setup

If more than one meter or if a meter and an oscilloscope are used, connect each to the terminals by a
separate pair of leads to avoid mutual coupling effects. For constant voltage dc tests, connect only to +S and
-S, since the unit regulates the output voltage that appears between +S and -S, and not between the (+) and
(-) output terminals. Use coaxial cable or shielded two-wire cable to avoid noise pickup on the test leads.

Voltage Programming and Readback Accuracy

This test verifies that the voltage programming, GPIB readback and front panel display functions are
within specifications. Note that the values read back over the GPIB should be identical to those displayed
on the front panel.
a. Turn off the supply and connect a digital voltmeter between the +S and the -S terminals as shown in
Figure 2-1a.
b. Turn on the supply and program the supply to zero volts and the maximum programmable current with
the load off.
c. Record the output voltage readings on the digital voltmeter (DVM) and the front panel display. The
readings should be within the limits specified in the performance test record chart for the appropriate
model under CV PROGRAMMING @ 0 VOLTS. Also, note that the CV annunciator is on. The output
current reading should be approximately zero.
d. Program the output voltage to full-scale.
e. Record the output voltage readings on the DVM and the front panel display. The readings should be
within the limits specified in the performance test record chart for the appropriate model under CV
PROGRAMMING @ FULL SCALE.
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Table 2-2. Programming Ratings
Voltage Full Scale
Max. Current Rating
8.190 10 A
Current Max. OVP Range
10.238 A 0 - 8.8 V