8 Service and Maintenance
220 E364xA User’s and Service Guide
Load transient response time
This test measures the time for the output voltage to recover to within 15 mV of
the 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 8-2 with an oscilloscope. Operate the electronic load in the constant
current mode.
2 Turn on the power supply. Select the output to be tested and the high voltage
range (20 V/1.545 A)
[1]
, enable the output, and set the display to the limit
mode. When the display is in the limit mode, program the current to the
maximum programmable value (1.545 A)
[2]
and the voltage to the full rated
value (20.0 V)
[2]
.
3 Set the electronic load current to half of the power supply full rated current
value, the electronic load to the transient operation mode with the transient
level to the power supply full rated current 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 8-5. Note that
the pulse width (t2 – t1) of the transients at 15 mV from the base line is no
more than 50 ms for the output.
6 Repeat step 1 through step 5 for the other output.
[1] For the E3646A model. For other models, refer to Table 8-5.
[2] For the E3646A model. For other models, refer to Table 7-3.
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