Technical data

1 Calibration Procedures

Performance Verification Tests

16 U8030A Series Service Guide

11 Disconnect the oscilloscope, and connect an RMS

voltmeter in its place. Do not disconnect the 50 Ω

termination. Divide the reading of the RMS voltmeter by

10. The result should not exceed the RMS limits of

• 1 mV

RMS

for U8031A and U8032A, and

• 2 mV

RMS

for Output 3.

Load transient response time

This test measures the time for the output voltage to recover

to within 15 mV of the nominal output voltage following a

load change from full load to half load or vice versa.

Procedure:

1 Power off the power supply, and connect the output to be

tested as shown in Figure 1- 1 with an oscilloscope.

Operate the electronic load in the CC mode.

2 Power on the power supply.

3 When the display is in the limit mode, program the

output voltage to full rated value (i.e., 30 V for U8031A

and 60 V for U8032A) and the output current to the

maximum programmable value.

4 Enable the output.

5 Set the electronic load to the transient operation mode

between one half of the output's full rated value and the

output's full rated value at a 1 kHz rate with 50% duty

cycle.

6 Set the oscilloscope coupling, internal sync, and lock on

to either the positive or negative load transient.

7 Adjust the oscilloscope to display transients as shown in

Figure 1- 6. Note that the pulse width (t

– t

) of the

transients at 15 mV from the base line is no more than

50 μs for the output.