Technical data

Service Guide 5
U8001A/U8002A User’s and Service Guide 69
Constant Voltage (CV) Verification
Voltage Programming and Readback Accuracy
This test is to verify that the voltage programming and
readback accuracy are within published specifications.
Procedures:
1 Power off the power supply and connect a DMM between
the (+) and (–) terminals of the output to be tested.
Remove the electronic load or resistor block as shown in
Figure 5- 7 (A), to operate as an open circuit.
2 Power on the power supply.
3 When the power supply is in limit mode, program the
output voltage to 0 V and the output current to the
maximum programmable value.
4 Enable the output.
5 Wait for a few seconds for the output of the power supply
to settle. Make sure that the power supply is in CV mode.
6 Record the voltage reading on the DMM (V
DMM
). This
value should be within the limit of 0 V ± 20 mV.
7 When the power supply is in meter mode, record the
voltage reading displayed on the front display of the
power supply. This value should be within the limit of
V
DMM
± 20 mV.
8 Disable the output.
9 When the power supply is in limit mode, program the
output voltage to full rated value, i.e. 30 V.
10 Enable the output.
11 Wait for a few seconds for the output of the power supply
to settle. Make sure that the power supply is in CV mode.
12 Record the voltage reading on the DMM (V
DMM
). This
value should be within the limit of 30 V ± 0.125 V.
13 When the power supply is in meter mode, record the
voltage reading displayed on the front display of the
power supply. This value should be within the limit of
V
DMM
± 0.125 V.