Calibration Procedures 3
Keysight E3633A and E3634A Service Guide 61
CV load effect (load regulation)
This test measures the immediate change in the output voltage resulting from a
change in the output current from full to no load.
1 Turn off the power supply and connect a digital voltmeter between the (+) and
(-) terminals of the output as shown in Figure 3-1.
2 Turn on the power supply. Select the 20V/10A
[1]
or 50V/4A
[2]
range, enable the
output, and set the display to the limit mode. When the display is in the limit
mode, program the output current to the maximum programmable value and
the voltage to the full rated value (20.0 V)
[1]
or (50.0 V)
[2]
.
3 Operate the electronic load in constant current mode and set its current to
(10.0 A)
[1]
or (4.0 A)
[2]
. Check that the front panel CV annunciator remains lit. If
not lit, adjust the load so that the output current drops slightly until the CV
annunciator lights. Record the output voltage reading on the digital voltmeter.
4 Operate the electronic load in open mode (input off). Record the output
voltage reading on the digital voltmeter immediately. The difference between
the digital voltmeter readings in steps (3) and (4) is the CV load regulation. The
difference of the readings during the immediate change should be within the
limit of (4 mV)
[1]
or (7 mV)
[2]
[1] For Keysight E3633A Model
[2] For Keysight E3634A Model
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