5 Service Guide
68 Keysight U8001A/U8002A User’s and Service Guide
Load transient response time
This test measures the time for the output voltage to recover to within 15 mV of
nominal output voltage following a load change from full load to half load or vice
versa.
Procedures:
1 Power off the power supply and connect the output to be tested as shown in
Figure 5-2(A) with an oscilloscope. Operate the electronic load in constant
current mode.
2 Power on the power supply.
3 When the display is in the limit mode, program the output voltage to full rated
value, i.e. 30 V and output current to the maximum programmable value.
4 Enable the output.
5 Set the electronic load to transient operation mode between one half of the
output's full rated value and the output’s full rated value at a 1 kHz rate with
50% duty cycle.
6 Set the oscilloscope coupling, internal sync and lock on either the positive or
negative load transient.
7 Adjust the oscilloscope to display transients as shown in Figure 5-4. Note that
the pulse width (t2–t1) of the transients at 15 mV from the base line is no more
than 50 µs for the output.
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