Technical data

Calibration Procedures 1
Performance Verification Tests
U8030A Series Service Guide 13
CV source effect (line regulation)
This test measures the change in the output voltage that
results from a change in the AC line voltage from its
minimum value to its maximum value.
Procedure:
1 Power off the power supply, and connect a multimeter
between the (+) and (–) terminals of the output to be
tested as shown in Figure 1- 1.
2 Connect the AC power line through an AC voltage source.
Adjust the AC voltage source to provide a 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 its full rated value (i.e., 30 V for U8031A
and 60 V for U8032A, and 5 V for Output 3) and the
output current to the maximum programmable value.
5 Enable the output.
6 Operate the electronic load in the CC mode, and set its
current to
• 6 A for U8031A,
• 3 A for U8032A, and
• 3 A for Output 3.
Ensure that the power supply is in the CV mode. If not,
adjust the electronic load so that the output current drops
slightly until the power supply is in the CV mode.
7 Adjust the AC voltage source to its low line voltage limit.
Record the output reading on the multimeter.
8 Within a few seconds after step 7, adjust the AC voltage
source to its high line voltage limit, and record the
voltage reading on the multimeter.