Transient response verification
This test measures the time for the output voltage to recover to within the specified value following a 50% change in
the load current.
1.
Turn off the power supply using the AC line switch.
2.
Connect an oscilloscope and electronic load between the (+) and (–) terminals of the output to be tested as
shown below.
3.
If you are using a PC to control the power supply, connect a LAN, or USB cable from the power supply to the
PC.
4.
Turn on the power supply using the AC line switch.
5.
Set the instrument settings as described in the test record form under “Transient Response”. See the
under “Transient Response” for details. Enable the output.
6.
Operate the electronic load in constant current mode and set its current to the value in the test record form
under “Transient Response”. See the
under Test Description of “Transient Response” for
details. Set the transient level to ½ the maximum current. Set the transient duty cycle to 50% and transient fre-
quency to 1 kHz. Check that the front panel CV annunciator of the power supply remains lit. If it turns to
CC
or
UR
, adjust the maximum current load so that the output current drops slightly until the CV annunciator lights
up.
7.
Adjust the oscilloscope to display transients as shown below. Note that the pulse width (t2-t1) of the transient
at the voltage settling band, for example 15 mV for Output 1 from the base line is no more than 50 µs.
22
Keysight EDU36311A Service Guide
