Service Guide 5
U8001A/U8002A User’s and Service Guide 59
CC Source Effect (Line Regulation)
This test measures the change in output current that results
from a change in AC line voltage from the minimum value to the
maximum value.
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 current monitoring resistor (R
M
).
2 Connect the AC power line through an AC voltage source.
Adjust the AC voltage source to provide nominal input
voltage to the power supply.
3 Power on the power supply.
4 When the display is in the limit mode, program the output
voltage to maximum programmable value and output current
to full rated value, i.e. 3 A for U8001A and 5 A for U8002A.
5 Enable the output.
6 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 output
voltage drops slightly until the power supply is in CC mode.
7 Adjust the AC voltage source to low line voltage limit. Record
the output current reading by dividing the voltage reading on
the DMM by the resistance of the current monitoring resistor.
8 Within a few seconds after step 7, adjust the AC voltage
source to high line voltage limit and record the output
current reading by dividing the voltage reading on the DMM
by the resistance of the current monitoring resistor.
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