3 Calibration Procedures
68 Keysight E3633A and E3634A Service Guide
CC source effect (line regulation)
This test measures the immediate change in output current that results from a
change in ac line voltage from the minimum value (10% below the nominal input
voltage) to the maximum value (10% above nominal voltage).
1 Turn off the power supply and connect the output to be tested as shown in
Figure 3-1 with the digital voltmeter connected across the current monitoring
resistor (R
M
).
2 Connect the ac power line through a variable voltage transformer.
3 Turn on the power supply. Select the 8V/20A
[1]
or 25V/7A
[2]
range, enable the
output, and set the display to the limit mode. When the display is in the limit
mode, program the voltage to the full rated value (8.0 V)
[1]
or (25.0 V)
[2]
and
the current to the full rated value (20.0 A)
[1]
or (7.0 A)
[2]
.
4 Operate the electronic load in constant voltage mode and set its voltage to
(8.0 V)
[1]
or (25.0 V)
[2]
. Check that the CC annunciator remains lit. If not lit,
adjust the load so that the output voltage drops slightly until the CC
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 current reading by dividing the voltage reading on the digital voltmeter
by the resistance of the current monitoring resistor.
6 Adjust the transformer to 10% above the nominal line voltage (127 Vac for a
115 Vac nominal input, 110 Vac for a 100 Vac nominal input or 253 Vac for a
230 Vac nominal input). Record the current reading again immediately by
dividing the voltage reading on the digital voltmeter by the resistance of the
current monitoring resistor. The difference between the current readings in
step (5) and (6) is the load regulation current. The difference of the readings
during the immediate change should be within the limit of (2.25 mA)
[1]
or (0.95
mA)
[2]
.
[1] For Keysight E3633A Model
[2] For Keysight E3634A Model
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