Chapter 3 Calibration Procedures

Constant Voltage (CV) Verifications

Constant Voltage (CV) Verifications

Constant Voltage Test Setup

If more than one meter or a meter and an oscilloscope are used, connect each to the (+) and (-) terminals by a separate pair of leads to avoid mutual coupling effects. Use coaxial cable or shielded 2-wire cable to avoid noise pick-up on the test leads.

Voltage Programming and Readback Accuracy

This test verifies that the voltage programming and GPIB or RS-232 readback functions are within specifications. Note that the readback values over the remote interface should be identical to those displayed on the front panel.

You should program the power supply over the remote interface for this test to avoid round off errors.

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.

2Turn on the power supply. Enable the outputs and select the desired output to be tested by sending the commands:

OUTP ON

INST {P6VP25VN25V}

3Program the selected output to zero volts and maximum programmable current (see Table 3-2) by sending the commands:

VOLT 0

 

CURR

5.15

for the +6V supply or

CURR

1.03

for the ±25V supply

4Record the output voltage reading on the digital voltmeter (DVM). The readings should be within the limits specified below for each output tested. Also, note that the CV, Adrs, Lmt, and Rmt annunciators are on.

Output

Programming Accuracy

 

 

+6V

0 ± 5 mV

 

 

+25V

0 ± 20 mV

 

 

-25V

0 ± 20 mV

 

 

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Agilent Technologies E3631A manual Constant Voltage CV Verifications, Constant Voltage Test Setup