Chapter 3 Calibration Procedures
Constant Current (CC) Verifications
60
CC Load Regulation
This test measures the immediate change in output current resulting from a change in
the load from full rated output voltage to short circuit.
1 Turn off the power supply and connect the output to tested as shown in Figure 3-1 with
the digital voltmeter connected across the 0.1
Ω current monitoring resistor (R
M
).
2 Turn on the power supply and select the desired output to be tested using the meter
and adjust selection key on the front panel. Enable the outputs 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 (see Table 3-2).
3 Operate the electronic load in constant voltage mode and set its voltage to the full
rated value of the output to be tested (see Table 3-2). Check that the CC annunciator
is 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 short (input short) mode. Record the current reading
within two seconds 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 (4) is the load regulation current. The difference of the readings
during the immediate change should be within the limit specified below for each
output tested.
5 Repeat steps (1) through (4) for the remaining outputs.
Output Difference
+6V 0.75 mA
+25V 0.35 mA
-25V 0.35 mA
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