50 U8001A/U8002A User’s and Service Guide
5Service Guide
CV Load Effect (Load Regulation)
This test measures the change in the output voltage resulting
from a change in the output current from full load to no load or
vice versa.
Procedures:
1 Power off the power supply and connect a DMM between the
(+) and (–) terminals of the output as shown in
Figure 5- 2(A).
2 Power on the power supply.
3 When the power supply is in limit mode, program the output
voltage to full rated value, i.e. 30 V and output current to the
maximum programmable value.
4 Enable the output.
5 Operate the electronic load in constant current mode and set
its current to 3 A for U8001A and 5 A for U8002A. Ensure
that the power supply is in CV mode. If not, adjust the
electronic load so that the current drops slightly until the
power supply is in CV mode.
6 Record the reading on the DMM.
7 Within a few seconds after step 6, operate the electronic load
in open mode and record the reading on the DMM.
8 Compare the reading obtained in steps 5 and 6. The
difference should be within the limit of 5 mV.
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