8 Service and Maintenance
224 E364xA User’s and Service Guide
CC load effect (load regulation)
This test measures the immediate change in output current resulting from a
change in the load from the maximum programmable value voltage to short
circuit.
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 0.01
Ω
current
monitoring resistor (R
M1
).
2 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 output voltage to the maximum programmable value and
the output current to the full rated value (3 A)
[1]
.
3 Set the voltage of the electronic load to full rated value (8.0 V)
[1]
to operate it
in the constant voltage mode since a voltage drop occurs on the load wires.
Check that the CC annunciator is turned on. If it is not, adjust the load so that
the output voltage drops slightly. Record the current reading by dividing the
voltage reading on the digital voltmeter by the resistance of the current
monitoring resistor.
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.
[1] For the E3646A model. For other models, refer to Table 8-5.
E3646A E3647A E3648A E3649A
0.55 mA 0.33 mA 0.75 mA 0.39 mA
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