Chapter 3 Calibration Procedures
Constant Voltage (CV) Verifications
57
3
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 and select the output to be tested using the meter and adjust
selection key on the front panel. Enable the outputs and set the display to the limit
mode. When the display is in the limit mode, program the current to the maximum
programmable value and the voltage to the full-scale value (see Table 3-2).
3 Set the electronic load to transient operation mode between one half of the output's
full scale value and the output's full scale 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 3-5. Note that the
pulse width (t
2
-t
1
) of the transients at 15 mV from the base line is no more than 50
μsec for each of the three outputs.
6 Repeat steps (1) through (5) for the remaining outputs.
Figure 3-5. Transient Response Time
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