3 Calibration Procedures
62 Keysight E3633A and E3634A Service Guide
CV source effect (line regulation)
This test measures the immediate change in output voltage that results from a
change in ac line voltage from the minimum value (10% below the nominal input
voltage) to maximum value (10% above the nominal input voltage).
1 Turn off the power supply and connect a digital voltmeter between the (+) and
(-) terminals of the output to be tested as shown in Figure 3-1.
2 Connect the ac power line through a variable voltage transformer.
3 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 current to the maximum programmable value and the
voltage to full rated value (20.0 V)
[1]
or (50.0 V)
[2]
.
4 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 CV annunciator remains lit. If not lit,
adjust the load so that the output current drops slightly until the CV
annunciator lights.
5 Adjust the transformer to low line voltage limit (104 Vac for nominal 115 Vac,
90 Vac for nominal 100 Vac, or 207 Vac for nominal 230 Vac). Record the
output reading on the digital voltmeter.
6 Adjust the transformer to high line voltage (127 Vac for nominal 115 Vac, 110
Vac for nominal 100 Vac, or 253 Vac for nominal 230 Vac). Record the voltage
reading on the digital voltmeter immediately. The difference between the
digital voltmeter readings in steps (5) and (6) is the CV line 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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