Keysight E3630A, Operating And Service Manual

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5 Service Information
58 Keysight E3630A Operating and Service Manual
Stability (Drift)
Definition: The change in output voltage (DC to 20 Hz) for the first 8 hours
following a 30-minute warm-up period with constant input line voltage, constant
load resistance and constant ambient temperature.
To measure the stability:
1 Connect the test equipment across the output of the +20 V supply as shown in
Figure 5-5 .
2 Operate the electronic load in constant current mode and set its current to the
full rated value of power supply.
3 Turn on the supply.
4 Turn up output voltage to the full rated value as read on the digital voltmeter.
5 After a 30-minute warm-up, note the voltage on DVM.
6 The output voltage reading should deviate less than 0.1% plus 5 mV from the
reading obtained in step e over a period of 8 hours.
7 Repeat for the remaining supply outputs.