Agilent Technologies E364 A Series, User Manual

Page: 174 / 207

Appendix Service Information
Constant Voltage (CV) Verifications
173
Ser
vice
In
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mat
ion
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 half load to full load.
1
Turn off the power supply and connect the output to be tested as shown in
Figure A-1 with an oscilloscope. Operate the electronic load in constant
current mode.
2 Turn on the power supply. Select the high voltage range (20V/1.5A)
†
, enable
the output, and set the display to the limit mode. When the display is in the
limit mode, program the current to the full scale rated value (1.5 A)
†
and the
voltage to the full scale rated value (20.0 V)
†
.
3
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.
4 Set the oscilloscope for ac coupling, internal sync, and lock on either the
positive or negative load transient.
5 Adjust the oscilloscope to display transients as shown in Figure A-4. Note that
the pulse width (t2 - t1) of the transients at 15 mV from the base line is no more
than 50
m
sec for the output.
Figure A-4 Transient Response Time
†
For E3640A model, and see
Table A-3 for other models