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2 – Verification and Performance Tests
a.
Turn off the supply and connect the output as shown in Figure 2-1a to an oscilloscope (ac
coupled) between the (+) and the (-) terminals. Set the oscilloscope's bandwidth limit to 20 MHz
and use an RF tip on the oscilloscope probe.
b.
Turn on the supply and program the current to the maximum programmable value and the output
voltage to the full-scale value.
c.
Adjust the load for the full-scale current value as indicated on the front panel display.
d.
Note that the waveform on the oscilloscope should not exceed the peak-to-peak limits in the
performance test record chart for the appropriate model under CV NOISE (PARD).
e.
Disconnect the oscilloscope and connect an ac rms voltmeter in its place. The rms voltage reading
should not exceed the RMS limits in the performance test record chart for the appropriate model under
CV NOISE (PARD).
Transient Recovery Time
This test measures the time for the output voltage to recover to within the specified value following a 50%
change in the load current.
a.
Turn off the supply and connect the output as in Figure 2-1a with the oscilloscope across the +S and the
-S terminals.
b.
Turn on the supply and program the output voltage to the full-scale value and the current to the
maximum programmable value.
c.
Set the load to the Constant Current mode and program the load current to 1/2 the power supply full-
scale rated current.
d.
Set the electronic load's transient generator frequency to 100 Hz and its duty cycle to 50%.
e.
Program the load's transient current level to the supply's full-scale current value and turn the transient
generator on.
f.
Adjust the oscilloscope for a waveform similar to that in Figure 2-2.
g.
The output voltage should return to within the specified voltage (v) in the specified time (t). Check both
loading and unloading transients by triggering on the positive and negative slope. Record the voltage
level at 100uS in the test record card under Transient Response.
16
tttt
v
v
t
Unloading
Transient
Figure 2-2. Transient Waveform
Loading
Transient
t
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Troubleshooting
