2 - Verification and Performance Tests
CV Source Effect
This test measures the change in output voltage that results from a change in ac line voltage from the minimum to maximum value within the line voltage specifications.
a.Turn off the supply and connect the ac power line through a variable voltage transformer.
b.Connect the output as shown in Figure
c.Turn on the supply and program the current to the maximum programmable value (Imax) and the output voltage to the
d.Adjust the load for the
e.Adjust the transformer to the lowest rated line voltage (e.g., 104 Vac for a 115 Vac nominal line voltage input).
f.Record the output voltage reading on the DVM.
g.Adjust the transformer to the highest rated line voltage (e.g., 127 Vac for 115 Vac nominal line voltage input).
h.Record the output voltage reading on the DVM. The difference between the DVM reading is steps (f) and (h) is the source effect voltage and should not exceed the value listed in the performance test record card for the appropriate model under CV Source Effect.
CV Noise (PARD)
Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac voltage superimposed on the dc output voltage. CV PARD is specified as the rms or
a.Turn off the supply and connect the output as shown in Figure
(+) and the
b.Turn on the supply and program the current to the maximum programmable value (Imax) and the output voltage to the
c.Adjust the load for the
d.Note that the waveform on the oscilloscope should not exceed the
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 card 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.
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