Technical data

Calibration Procedures 1
Performance Verification Tests
U8030A Series Service Guide 19
CC load effect (load regulation)
This test measures the immediate change in the output
current resulting from a change in the load from the full
rated output voltage to a short circuit.
Procedure:
1 Power off the power supply, and connect the output to be
tested as shown in Figure 1- 2 with the multimeter
connected across the 0.01 Ω current monitoring resistor
(R
M
).
2 Power on the power supply.
3 When the power supply is in the limit mode, program the
output voltage to its maximum programmable value and
the output current to full rated value, i.e., 6 A for U8031A
and 3 A for U8032A.
4 Enable the output.
5 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 voltage drops slightly until
the power supply is in the CC mode.
6 Allow the instrument to stabilize for 7 minutes before you
record the current reading by dividing the voltage reading
on the multimeter by the resistance of the current
monitoring resistor.
7 Within a few seconds after step 6, operate the electronic
load in the short mode, and allow the instrument to
stabilize for 7 minutes before you record the current
reading by dividing the voltage reading on the multimeter
by the resistance of the current monitoring resistor.
8 Compare the reading obtained in step 6 and step 7. The
difference should be within the limit of:
• 3.2 mA for U8031A, and
• 2.6 mA for U8032A.