Technical data

Service and Maintenance 8
Constant Voltage (CV) Verifications
E364xA User’s and Service Guide 193
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
Table 8- 1 with an oscilloscope.
Operate the electronic load in the constant current mode.
2 Turn on the power supply. Select the high voltage range
(20 V/1.5 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 full- scale rated value (1.5 A)
[1]
and the voltage to the full- scale rated value (20.0 V)
[1]
.
3 Set the electronic load to the transient operation mode
between one half of the output’s full- scale rated value and
the output’s full- scale 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- 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.
[1] For the E3640A model. For other models, refer to Tabl e 8 -5 .