2 Performance Verification
20 Model N6705 Service Guide
CC Load Effect
Test category = performance
This test measures the change in output current resulting from a change
in output voltage from full scale to short circuit.
1 Turn off the DC Power Analyzer and connect the current shunt,
DMM, and electronic load (see Test Setup B). Connect the DMM
directly across the current shunt.
2 Turn on the DC Power Analyzer and program the instrument settings
as described in the test record under “CC Load Effect”.
3 Set the electronic load for CV mode and program it to the output
channel’s voltage as described in the test record under “CC Load
Effect”. The output status should be “CC”. If it isn’t, adjust the load
so that the output voltage drops slightly.
4 Divide the voltage drop (DMM reading) across the current
monitoring resistor by its resistance to convert to amps and record
this value (Iout).
5 Short the electronic load. For models N6751A and N6752A, wait 10
seconds for the output to stabilize. For models N6761A and N6762A,
wait 60 seconds for the output to stabilize. Divide the voltage drop
(DMM reading) across the current monitoring resistor by its resistance to
convert to amps and record this value (Iout). The difference in the current
readings in steps 4 and 5 is the load effect, which should not exceed the
value listed in the test record for the appropriate model under “CC Load
Effect”.
6 For models N6781A and N6782A only. Repeat steps 2 through 5 for
the 1 A range and the 300 mA range.
7 For model N6784A only. Repeat steps 2 through 5 for the 1 A range,
the 100 mA range, and the 10 mA range.
Test category = performance
This test measures the change in output current that results from a
change in AC line voltage from the minimum to maximum value within
the line voltage specifications.
1 Turn off the DC Power Analyzer and connect the ac power line
through a variable voltage transformer or AC source.
2 Connect the current shunt, DMM, and electronic load (see Test
Setup B). Connect the DMM directly across the current shunt. Set
the transformer or AC source to nominal line voltage.
3 Turn on the DC Power Analyzer and program the instrument settings
as described in the test record under “CC Source Effect”.
4 Set the electronic load for the output channel’s voltage under “CC
Source Effect”. The output status should be “CC”. If it isn’t, adjust the
load so that the output voltage drops slightly.
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