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18 Verification
Table 2-4. Constant Voltage (CV) Tests (continued)
Action
Normal Result
Transient Recovery Time
This test measures the time required for the output voltage to return to within 100mV of its final value following a 50%
change in output load current. Measurements are made on both the unloading transient (from full load to 1/2 load) and the
loading transient (from 1/2 load to full load).
1 Turn off the power supply and connect an oscilloscope across +S and -S
(see Fig. 2-1).
2 Turn on the power supply and program the current to its maximum
programmable value and the voltage to its full-scale value (see Table 2-2).
3 Program the Electronic Load as follows:
þ Operating mode to constant current.
þ Input load current to 1/2 the supply's full rated output current.
þ Transient current level to the supply's full rated output current.
þ Transient generator frequency = 100Hz.
þ Transient generator duty cycle = 50%.
4 Turn on the transient and adjust the oscilloscope to display response
waveform.
See Fig. 2-2.
5 Measure both the loading and unloading transients by triggering the
oscilloscope on both the negative and positive slopes of the transient.
Record the voltage level obtained at the 900-µs interval .
Specified voltage level is reached within
900µs.
Figure 2-2. Transient Response Waveform