Service and Maintenance 8
Constant Current (CC) Verifications
E364xA User’s and Service Guide 207
4 Operate the electronic load in the short (input short)
mode. Record the current reading immediately by dividing
the voltage reading on the digital voltmeter by the
resistance of the current monitoring resistor. The
difference between the current readings in
step 3 and
step 4 is the load regulation current. The difference of the
readings during the immediate change should be within
the following limits:
5 Repeat step 1 through step 4 for the other output.
CC source effect (line regulation)
This test measures the immediate change in output current
that results from a change in AC line voltage from the
minimum value (10% below the nominal input voltage) to the
maximum value (10% above the nominal voltage).
1 Turn off the power supply and connect the output to be
tested as shown in
Figure 8- 2 with the digital voltmeter
connected across the current monitoring resistor (R
M1
).
2 Connect the AC power line through a variable voltage
transformer.
3 Turn on the power supply. Select the low voltage range
(8 V/3 A)
[1]
, enable the output, and set the display to the
limit mode. When the display is in the limit mode,
program the voltage to the maximum programmable value
and the current to the full rated value (3 A)
[1]
.
4 Operate the electronic load in the constant voltage mode
and set its voltage to full rated value (8.0 V)
[1]
. Check
that the CC annunciator remains lit. If not lit, adjust the
load so that the output voltage drops slightly until the CC
annunciator lights up.
E3646A E3647A E3648A E3649A
0.55 mA 0.33 mA 0.75 mA 0.39 mA
[1] For the E3646A model. For other models, refer to Tabl e 8 -5 .
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