Appendix Service Information
Constant Voltage (CV) Verifications
188
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 output to be tested and 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
μsec for the output.
6 Repeats steps (1) through (5) for the other output.
Figure A-4 Transient Response Time
†
For E3646A model, and see Table A-3 for other models
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