16
Figure 2-3. Basic Test Setup
d. Reduce the resistance of the load to draw an output current of:
29Adc (6023A)
10Adc (6028A)
Check that the unit's CV LED remains lighted.
e. Record the output voltage at the digital voltmeter.
f. Open-circuit the load.
g. When the reading settles, record the output voltage again. Check that the two recorded readings differ no more than:
± 0.0027Vdc (6023A)
± 0.0090Vdc (6028A)
Source Effect (Line Regulation). Source effect is the change in dc output voltage resulting from a change in ac input
voltage from the minimum to the maximum value as specified in Input Power Requirements in the Specifications Table, in
the Operating Manual. 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. Connect the unit to the ac power line through a variable autotransformer which is set for low line voltage (104Vac for
120Vac).
c. Turn the unit's power on, and turn up current setting to full output.
d. Turn up output voltage to:
20.0Vdc (6023A)
60Vdc (6028A)
as read on the digital voltmeter.
e. Reduce the resistance of the load to draw an output current of:
10Adc (0.010Vdc across Rm) (6023A)
3.3Adc(0.33Vdc across Rm) (6028A)
Check that the unit's CV LED remains lighted.