5
Service Guide
72
Keysight U8001A/U8002A User’s and Service Guide
CC load effect (load regulation)
This test measures the immediate change in output current resulting from a
change in the load from full rated output voltage to short circuit.
Procedures:
1
Power off the power supply and connect the output to be tested as shown in
with the DMM connected across the 0.01
Ω
current monitoring
resistor (R
M
).
2
Power on the power supply.
3
When the power supply is in limit mode, program the output voltage to
maximum programmable value and output current to full rated value, i.e. 3 A
for U8001A and 5A for U8002A.
4
Enable the output.
5
Operate the electronic load in constant voltage mode and set its voltage to
30 V. Ensure that the power supply is in CC mode. If not, adjust the electronic
load so that the voltage drops slightly until the power supply is in CC mode.
6
Record the current reading by dividing the voltage reading on the DMM by the
resistance of the current monitoring resistor.
7
Within a few seconds after step 6, operate the electronic load in short mode
and record the current reading by dividing the voltage reading on the DMM by
the resistance of the current monitoring resistor.
8
Compare the reading obtained in steps 6 and 7. The difference should be
within the limit of:
– U8001A: 2.6 mA
– U8002A: 3 mA
