Technical data

8 Service and Maintenance
Constant Voltage (CV) Verifications
202 E364xA User’s and Service Guide
2 Turn on the power supply. Select 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)
[1]
.
3 Check that the front panel CV annunciator remains lit. If
it is not lit, adjust the load down slightly.
4 Note that the waveform on the oscilloscope must not
exceed the peak- to- peak limit of (5 mV)
[3]
or (8 mV)
[4]
.
5 Disconnect the oscilloscope and connect the AC rms
voltmeter in its place according to the
“Vrms
measurement techniques” on page 200 and as shown in
Figure 8- 4. The rms voltage reading must not exceed the
rms limit of 0.5 mV
[3]
or 1 mV
[4]
.
6 Repeat step 1 through step 5 for the other output.
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 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)
[1]
.
[1] For the E3646A model. For other models, refer to Tabl e 8 -5 .
[2] For the E3646A model. For other models, refer to Tabl e 7 -3 .
[3] For the E3646A/E3648A model.
[4] For the E3647A/E3649A model.