Chapter 3 Calibration Procedures
Constant Voltage (CV) Verifications
52
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
3-1 with an oscilloscope. Operate the electronic load in constant current mode.
2
Turn on the power supply. Select the 30V/4A enable the outputs and set the
display to the limit mode. When the display is in the limit mode, program the
current to the full rated value (4.0A) and the voltage to the full rated value
(3.0V).
3
Set the electronic load to transient operation mode between one half of the
output's full scale value and the output's full rated value at a 1 kHz rate with
50% duty cycle.
4
Set the the oscilloscope for ac coupling, internal sync, and lock on either the
positive or negative load transient.
5
Adjust the the oscilloscope to display transients as shown in Figure 3-2. Note
that the pulse width (t
2
-t
1
) of the transients at 15 mV from the base line is no
more than 50
msec for the output.
Figure 3-2. Transient Response Time
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