Chapter 3 Calibration Procedures

Constant Current (CC) Verifications

Constant Current (CC) Verifications

Constant Current Test Setup

Follow the general setup instructions in the "Measurement Techniques" section starting on page 45 and the specific instructions will be given in the following paragraphs.

Current Programming and Readback Accuracy

This test verifies that the current 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. The accuracy of the current monitoring resistor must be 0.1% or better.

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 0.19 current monitoring resistor (RM) across the output to be tested and a digital voltmeter across the current monitoring resistor (RM).

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 voltage to 5.0 volts and the current to 0 amps by sending the commands:

VOLT 5

CURR 0

4Divide the voltage drop (DVM reading) across the current monitoring resistor

(RM) by its resistance to convert to amps and record this value (IO). This value should be within the limits specified below for each output tested. Also, note that the CC, Adrs, Lmt, and Rmt annunciators are on.

Output

Programming Accuracy

 

 

+6V

0 A ± 10 mA

 

 

+25V

0 A ± 4 mA

 

 

-25V

0 A ± 4 mA

 

 

54

Page 55
Image 55
Agilent Technologies E3631A manual Constant Current CC Verifications, Constant Current Test Setup