Technical data

1 Calibration Procedures
Performance Verification Tests
20 U8030A Series Service Guide
CC source effect (line regulation)
This test measures the change in the output current that
results from a change in the AC line voltage from the
minimum value to the maximum value.
Procedure:
1 Power off the power supply, and connect the output to be
tested as shown in step 1- 2 with the multimeter
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 the maximum programmable value and
the output current to its full rated value, i.e., 6 A for
U8031A and 3 A for U8032A.
5 Enable the output.
6 Operate the electronic load in the CV mode and set its
voltage to 30 V for U8031A and 60 V for U8032A. Ensure
that the power supply is in the CC mode. If not, adjust
the electronic load so that the output voltage drops
slightly until the power supply is in the CC mode.
7 Adjust the AC voltage source to the low line voltage limit.
Allow the instrument to stabilize for 7 minutes before you
record the output current reading by dividing the voltage
reading on the multimeter by the resistance of the current
monitoring resistor.
8 Within a few seconds after step 7, adjust the AC voltage
source to the high line voltage limit and record the output
current reading by dividing the voltage reading on the
multimeter by the resistance of the current monitoring
resistor.