18
Constant Voltage (CV) Tests
CV Setup. If more than one meter or a meter and an oscilloscope are used, connect each to the + S and - S terminals by a
separate pair of leads to avoid mutual coupling effects. Connect only to + S and -S (except for peak-to-peak PARD)
because the unit regulates the output voltage between + S and - S, not between + OUT and -OUT. Use coaxial cable or
shielded 2-wire cable to avoid pickup on test leads. For all CV tests set the output current at full output to assure CV
operation.
Load Effect (Load Regulation). Constant-voltage load effect is the change in dc output voltage (Eo) resulting from a
load-resistance change from open-circuit to full-load. Full-load is the resistance which draws the maximum rated output
current at voltage Eo. Proceed as follows:
a. Connect the test equipment as shown in Figure 2-3. Operate the load in constant resistance mode (Amps/Volt) and set
resistance to maximum.
b. Turn the unit's power-on, and turn up current setting to full output.
c. Turn up output voltage to:
60Vdc (6010A)
7.0Vdc (6011A)
20.0Vdc (6012B)
200Vdc (6015A)
as read on the digital voltmeter.
Figure 2-3. Basic Test Setup
d. Reduce the resistance of the load to draw an output current of:
17.0Adc (6030A)
120Adc (6011A)
50Adc (6012B)
5.0Adc (6015A)
Check that the unit's CV LED remains lighted.
e. Record the output voltage at the digital voltmeter.
f. Open-circuit the load.