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B - Performance, Calibration, and Configuration
146
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 (performance, calibration)
This test verifies that the voltage programming, GPIB readback and front panel display functions are
within specifications. Note that values read back over the GPIB should be identical to those displayed on
the front panel.
a. Turn off the dc source and connect a DVM directly across the +S and -S terminals as shown in
Figure B-1a.
b. Turn on the dc source and program the output to zero volts and the maximum programmable current
(Imax in Table B-2) 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 card for the appropriate
model under Voltage Programming and Readback @ 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 (see Table B-2) .
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 card for the appropriate model under
Voltage Programming and Readback @ Full Scale.
CV Load Effect (performance)
This test measures the change in output voltage resulting from a change in output current from full load
to no load.
a. Turn off the dc source and connect a DVM directly across the +S and -S terminals as shown in
Figure B-1a.
b. Turn on the dc source and program the current to the maximum programmable value (Imax) and the
voltage to the full-scale value in Table B-2.
c. Adjust the load for the full-scale current in Table B-2 as indicated on the front panel display. The CV
annunciator on the front panel must be on. If it is not, adjust the load so that the output current drops
slightly.
d. Record the output voltage reading on the DVM connected to +S and -S.
e. Open the load and again record the DVM voltage reading. The difference between the DVM readings
in steps (d) and (e) is the load effect voltage, and should not exceed the value listed in the
performance test record card for the appropriate model under CV Load Effect.