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
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
. 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.