58 U8001A/U8002A User’s and Service Guide
5Service 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 Figure 5- 2(B) 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
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