8 Service and Maintenance
Constant Voltage (CV) Verifications
198 E364xA User’s and Service Guide
10 Record the value displayed on the controller. This value
should be within the limit of (DVM ±15 mV)
[1]
or
(DVM ±35 mV)
[2]
for output1, or (DVM ±45 mV)
[1]
or
(DVM ± 85 mV)
[2]
for output2.
11 Repeat step 1 through step 10 for the other output.
CV load effect (load regulation)
This test measures the immediate change in the output
voltage resulting from a change in the output current from
full to no load.
1 Turn off the power supply and connect a digital voltmeter
between the (+) and (–) terminals of the output as shown
in
Figure 8- 2.
2 Turn on the power supply. Select the output to be tested
and the high voltage range (20 V/1.5 A)
[3]
, enable the
output, and set the display to the limit mode. When the
display is in the limit mode, program the output current
to the maximum programmable value and the voltage to
the full rated value (20.0 V)
[3]
.
3 Operate the electronic load in constant current mode and
set its current to be the same as the power supply full
rated value (1.5 A)
[3]
. Check that the front panel CV
annunciator remains lit. If not lit, adjust the load so that
the output current drops slightly until the CV annunciator
lights up. Record the output voltage reading on the digital
voltmeter.
4 Operate the electronic load in open mode (input off).
Record the output voltage reading on the digital voltmeter
immediately. The difference between the digital voltmeter
readings in
step 3 and step 4 is the CV load regulation.
The difference of the readings during the immediate
change should be within the limit of (5 mV)
[1]
or
(9 mV)
[2]
.
[1] For the E3646A/E3648A model.
[2] For the E3647A/E3649A model.
[3] For the E3646A model. For other models, refer to Tabl e 8 -5 .
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