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Chapter 3 Calibration Procedures
Constant Voltage (CV) Verifications
CV Load Regulation
This test measures the change in the output voltage resulting from a change in the output current from full to no load.
1Turn off the power supply and connect a digital voltmeter between the (+) and
2Turn 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 current of the selected output to the maximum programmable value and the voltage to the
3Operate the electronic load in constant current mode and set its current to the full scale value of the output to be tested (see Table
4Operate the electronic load in open mode (input off). Record the output voltage reading on the digital voltmeter again. The difference between the digital voltmeter readings in steps (3) and (4) is the CV load regulation. The difference of the readings should be within the limit specified below for each output tested.
Output | Programming Accuracy |
|
|
+6V | 2.6 mV |
|
|
+25V | 4.5 mV |
|
|
4.5 mV | |
|
|
5Repeat steps (1) through (4) for the remaining outputs.
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