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Verification and Performance Tests 17
Note You may want to use the average reading program described previously.
7. Adjust the transformer to the HIGH line voltage (e.g., 132Vac for a 115Vac nominal input, or 250Vac for a 230Vac
nominal input), and record the output current reading.
8. The difference in the current readings in steps (6) and (7) is the CC source effect and should not exceed the values
listed in the Performance Test Record Tables under CC SOURCE EFFECT, for the particular model being tested.
CC Noise (PARD)
Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac current as well as
an ac voltage superimposed on the dc output. Constant current (CC) PARD is specified as the rms output current in a
frequency range 20Hz to 20MHz with the module in CC operation.
1. Turn off the module and connect the load resistor (R
L
) and rms voltmeter as shown in Figure 2-1. Use only a resistive
load for this test. Keep leads as short as possible to reduce noise pickup.
2. Check the test setup for noise with the module turned off. Other equipment (e.g. computers, DMM, etc.) may affect the
reading.
3. Turn on the module and program the current to full-scale and the output voltage to the maximum programmable value
(see Table 2-1).
4. The output current should be at the full-scale rating with the CC Mode on.
5. Divide the reading on the rms voltmeter by the shunt resistance to obtain rms current. It should not exceed the values
listed in the Performance Test Record Tables under CC NOISE (Rms) for the particular unit being tested.