DMM measures the power supply output, and the electronic load draws current from the power supply. The
accuracy of the current monitoring resistor must be 0.01% or better, which should include any self-heating effects.
Constant Voltage (CV) verification
Voltage programming and readback accuracy
These tests verify that the voltage programming and the LAN or USB readback functions are within specifications.
Note that the readback values over the remote interface should be identical to those displayed on the front panel,
but with maximum resolution.
1.
Turn off the power supply using the AC line switch.
2.
Connect a DMM between the (+) and (–) terminals of the output.
3.
If you are using a computer to control the power supply, connect a LAN or USB cable from the power supply to
the PC.
4.
Turn on the power supply using the AC line switch.
Voltage programming accuracy
Step
Front Panel
SCPI
5.
Set the instrument settings as described in the test record form
under the Voltage Programming and Readback. See
for details.
VOLT 6, (@<channel>); CURR 5, (@<channel>)
This is an example for 6 V, 5 A output.
6.
Enable the output by pressing ON key for the selected output.
OUTP ON, (@<channel>)
7.
The output status should be
CV
and the output current should be close to zero.
8.
Record the voltage measured by the DMM and verify whether it is within the limits calculated.
Voltage readback accuracy
Step
Front Panel
SCPI
9.
MEAS:VOLT? (@<channel>)
This is an example for 6 V, 5 A output.
10.
Record the voltage returned by the SCPI command query via Keysight Connection Expert, and verify whether it
is within the limits calculated.
Keysight EDU36311A Service Guide
19
