Technical data

1 Calibration Procedures
Performance Verification Tests
12 U8030A Series Service Guide
CV load effect (load regulation)
This test measures the change in the output voltage resulting
from a change in the output current from full load to no
load or vice versa.
Procedure:
1 Power off the power supply, and connect a multimeter
between the (+) and (–) terminals of the output as shown
in Figure 1- 1.
2 Power on the power supply.
3 When the power supply is in the limit mode, program the
output voltage to its full rated value (i.e., 30 V for
U8031A, 60 V for U8032A, and 5 V for Output 3) and the
output current to the maximum programmable value.
4 Enable the output.
5 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 current drops
slightly until the power supply is in the CV mode.
6 Record the reading on the multimeter.
7 Within a few seconds after step 6, operate the electronic
load in open mode and record the reading on the
multimeter.
8 Compare the reading obtained in step 5 and step 6 with
the reading obtained in step 7. The difference should be
within the limit of
• 5 mV for U8031A,
• 8 mV for U8032A, and
• ≤ 5 mV for Output 3.