Agilent Technologies E3631A manual CV Line Regulation

Chapter 3 Calibration Procedures

Constant Voltage (CV) Verifications

CV Line Regulation

This test measures the change in output voltage that results from a change in ac line voltage from the minimum value (10% below the nominal input voltage) to maximum value (10% above the nominal input voltage).

1Turn off the power supply and connect a digital voltmeter between the (+) and (-) terminals of the output to be tested as shown in Figure 3-1.

2Connect the ac power line through a variable voltage transformer.

3Turn 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 full-scale value (see Table 3-2).

4Operate the electronic load in constant current mode and set its current to the full scale value (see Table 3-2) of the output to be tested. 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.

5Adjust the transformer to low line voltage limit (104 Vac for nominal 115 Vac, 90 Vac for nominal 100 Vac, or 207 Vac for nominal 230 Vac). Record the output reading on the digital voltmeter.

6Adjust the autotranformer to high line voltage (127 Vac for nominal 115 Vac, 110 Vac for nominal 100 Vac, or 253 Vac for nominal 230 Vac). Record the voltage reading on the digital voltmeter. The difference between the digital voltmeter readings in steps (5) and (6) is the CV line regulation. The difference of the readings should be within the limit specified below for each output tested.

Output	Difference
+6V	2.6 mV
+25V	4.5 mV
-25V	4.5 mV

7Repeat steps (1) through (6) for the remaining outputs.

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