Load Module Verification Tests - Models N6791A and N6792A
Voltage Programming and Readback Accuracy
Test category = performance, calibration
This test verifies that the voltage programming and measurement functions are within specifications.
Step 1. Turn off the power system and connect a DMM across the sense terminals and an external
power supply across the input terminals (see Test Setup G).
Step 2. Turn on the power system and program the N679xA load settings as described in the test
record form for “Voltage Programming & Readback, Minimum voltage”. Turn on the power supply and
program it to the power supply settings described in the test record form.
Step 3.Turn the load input on. The load status should be “CV” and the input current should be close to
zero.
Step 4. Record the voltage reading from the DMM and the voltage measured over the interface. The
readings should be within the limits specified in the test record form for the appropriate model under
“Voltage Programming & Readback, Minimum voltage”.
Step 5. Program the N679xA load settings as described in the test record form for “Voltage
Programming & Readback, High voltage”.
Step 6. Record the voltage reading from the DMM and the voltage measured over the interface. The
readings should be within the limits specified in the test record form for the appropriate model under
“Voltage Programming & Readback, High voltage”.
Current Programming and Readback Accuracy
Test category = performance, calibration
This test verifies that the current programming and measurement functions are within specifications.
High Range
Step 1. Turn off the power system and connect the DMM, current shunt, and an external power supply
across the input terminals (see Test Setup H). Connect the DMM directly across the current shunt.
Step 2. Turn on the power system and program the N679xA load settings as described in the test
record form under “Current Programming & Readback - High range, Minimum current”. Turn on the
power supply and program it to the power supply settings described in the test record form.
Step 3.Turn the load input on. The load status should be “CC”, and the input voltage should be close
to zero.
Step 4. Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value (Iin). Also record the current measured over the interface. The
readings should be within the limits specified in the test record form for the appropriate model under
“Current Programming & Readback - High range, Minimum current”.
Keysight N6700C Operating and Service Guide 343
6 Verification and Calibration
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