Keysight Technologies N6705C, Operating And Service Manual

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Step 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 shunt by the shunt 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”.
Step 6. For models N6781A and N6782A only. Repeat steps 2 through 5 for the 1 A range and the 300
mA range.
Step 7. For model N6784A only. Repeat steps 2 through 5 for the 1 A range, the 100 mA range, and the
10 mA range.
Constant Current Source Effect (all models except N678xA SMU)
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.
Step 1. Turn off the power analyzer and connect the ac power line through a variable voltage
transformer or an AC source.
Step 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.
Step 3. Turn on the power analyzer and program the instrument settings as described in the test
record form under “CC Source Effect”.
Step 4. Set the electronic load for the output channel’s voltage as described in the test record form
under “CC Source Effect”. The output status should be “CC”. If it isn’t, adjust the load so that the
output voltage drops slightly.
Step 5. Adjust the AC input to the lowest rated line voltage (86 VAC).
Step 6. Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value (Iout).
Step 7. Adjust the AC input to the highest rated line voltage (264 VAC).
Step 8. Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value (Iout). The difference between the DMM reading in steps 6 and 8
is the source effect, which should not exceed the value listed in the test record form for the
appropriate model under “CC Source Effect”.
8 Verification and Calibration
384 Keysight N6705C Operating and Service Guide