Keysight E3631A, Service Manual

Page: 68 / 131

3 Calibration Procedures
66 Keysight E3631A Service Guide
Constant Current (CC) Verifications
Constant current test setup
Follow the general setup instructions in the “Measurement techniques” on
page 54 and the specific instructions will be given in the following paragraphs.
Current programming and readback accuracy
1 Turn off the power supply and connect a 0.1 W current monitoring resistor (R
M
)
across the output to be tested and a digital voltmeter across the current
monitoring resistor (R
M
).
2 Turn on the power supply. Enable the outputs and select the desired output to
be tested by sending the commands:
OUTP ON
INST {P6V|P25V|N25V}
3 Program the selected output voltage to 5.0 volts and the current to 0 amps by
sending the commands:
VOLT 5
CURR 0
4 Divide 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.
5 Readback the output current from the selected output over the remote
interface by sending the command:
MEAS:CURR? {P6V|P25V|N25V}
Output
Programming
Accuracy
+6V Output 0 A ± 10 mA
+25V Output 0 A ± 4 mA
-25V Output 0 A ± 4 mA