CV load and line regulation
These tests verify that the voltage variation due to load or line variation are within specifications.
CV load regulation
This test measures the change in output voltage resulting from a change in output current from full load
to no load.
1.
Turn off the power supply using the AC line switch.
2.
Connect the power supply output with a DMM and an electronic load.
3.
If you are using a PC to control the power supply, connect a LAN or USB cable from the power sup-
ply to the PC.
4.
Turn on the power supply using the AC line switch.
5.
Set the power supply settings as described in the test record form under “CV Load Regulation”. See
the Test Record Forms under “CV Load Regulation” for details. Enable the output.
6.
Operate the electronic load in constant current mode and set its current to the value in the test
record form under “CV Load Regulation”. See the Test Record Forms under Test Description of “CV
Load Regulation” for details. Check that the front panel CV annunciator of the power supply remains
lit. If it turns to CC or UNREG, adjust the load so that the output current drops slightly until the CV
annunciator lights up. Record the output voltage reading on the DMM as V
load
.
7.
Operate the electronic load in open mode (input off). Record the output voltage reading on the
DMM immediately as V
noload
.
8.
Take the difference between the DMM readings in steps 6 and 7 that is the CV load regulation (V
load
– V
noload
). The difference of the readings during the immediate change should be within the spe-
cification limits.
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