Calibration Procedures 3
Keysight E3633A and E3634A Service Guide 69
CC PARD (ripple and noise)
Periodic and random deviations (PARD) in the output (ripple and noise) combine
to produce a residual ac current, as well as an ac voltage superimposed on the dc
output. CC PARD is specified as the rms output current in a frequency range 20 Hz
to 20 MHz with the power supply in constant current operation.
1 Turn off the power supply and connect the output to be tested as shown in
Figure 3-1with a load resistor (0.4 Ω)
[1]
or (3.5 Ω)
[2]
across output terminals.
Connect a rms voltmeter across the load resistor. Use only a resistive load for
this test.
2 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 current to full rated value (20.0 A)
[1]
or (7.0 A)
[2]
and the
voltage to the full rated value (8.0 V)
[1]
or (25.0 V)
[2]
.
3 The output current should be at the full rated rating with the CC annunciator
on. If not lit, adjust the load so that the output voltage drops slightly until the
CC annunciator lights.
4 Divide the reading on the rms voltmeter by the load resistance to obtain rms
current. The readings should be within the limit of 2 mA.
[1] For Keysight E3633A Model
[2] For Keysight E3634A Model
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