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20 Verification
Table 2-5. Constant Current (CC) Tests (continued)
Action Normal Result
CC Noise (PARD) (cont)
2 Measure the residual noise on the DVM with the power supply turned off.
Noise generated by other equipment may affect this measurement and
should be removed or factored out.
3 Turn on the power supply and program the current to its full scale value
and the voltage to its maximum programmable value (see Table 2-2).
4 Adjust the load in the CV mode for full-scale voltage (see Table 2-2) as
shown on the front panel display.
The power supply output current should
be at its full-scale value and the CC
annunciator on. If it is not, adjust the
load to slightly reduce the output
voltage until the annunciator comes on.
5 Observe the reading on the rms voltmeter. Multiply rms voltage by 0.1 to
obtain the rms noise current.
Current is within the specified PARD
rms limits (see Table 2-6).
CC Load Effect
This test measures the change in output current resulting from a change in load from full-load voltage to a short circuit. It is
recommended that you use averaged readings for Steps 5 and 6 of this test (see Averaging AC Measurements at the end of
this chapter).
Note: Refer to Figure 2-4. If you are using Agilent 60504B Eloads, a series DC power source is required to supply the
minimum 3 volt input required by the Agilent 60504B Eloads. The series DC source must be capable of 3VDC at a current
level greater than the output current of the supply being tested. A switch can be used in place of the series supply if the
Eloads are used in place of a load resistor as shown in Fig. 2-4(b).
1 Turn off the power supply and connect a DVM across the current
monitoring resistor (see Fig. 2-3).
2 Turn on the power supply and program the current to its full scale value
and the voltage to its maximum programmable value (see Table 2-2).
3 Set the Electronic Load to CV mode and its voltage to full scale as
indicated on its front panel display. Set the series supply for 3VDC and a
current greater than that being tested. Series source should be in CV mode.
Power supply output current is full scale
and its CC annunciator is on. If not,
reduce the Electronic Load voltage
slightly until the annunciator comes on.
4 Observe the DVM reading. Divide this by the resistance of the current
monitoring resistor to obtain the output current. Record the result.
You may want to use an averaged
reading for this measurement.
5 Program the Electronic Load input to 3 volts or short the Electronic Load
input and repeat Step 5.
You may want to use averaged reading
for this measurement.
6 Check the result. The difference between the current
readings taken in Step 5 and Step 6 must
be within specified “Load Effect” limits
(see Table 2-2).