Service Guide 5
Keysight U8001A/U8002A User’s and Service Guide 65
CV source effect (line regulation)
This test measures the change in output voltage that results from a change in AC
line voltage from the minimum value to maximum value.
Procedures:
1 Power-off the power supply and connect a DMM between the (+) and (–)
terminals of the output to be tested as shown in Figure 5-2(A).
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 full rated
value, i.e. 30 V and output current to the maximum programmable value.
5 Enable the output.
6 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 output current drops slightly until
the power supply is in CV mode.
7 Adjust the AC voltage source to low line voltage limit. Record the output
reading on the DMM.
8 Within a few seconds after step 7, adjust the AC voltage source to high line
voltage limit and record the voltage reading on the DMM.
9 The difference between the DMM readings in steps 7 and 8 should be within
the limit of 5 mV.
Line voltage
Low line voltage limit, V
ac
High line voltage limit, V
ac
100 90 110
115 104 127
230 207 253
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