Step 17. Calculate the resistance value as follows: R = Vin/Iin. Vin is the voltage measured by the
second DMM. Convert the input resistance (R) to Siemens by inverting the value: S = 1/R. The value in
Siemens should not exceed value listed in the test record under “Resistance Programming - Low
range, Minimum resistance”.
Step 18. Program the N679xA load settings as described in the test record form under “Resistance
Programming - Low range, High resistance”. Program the power supply to the power supply settings
described in the test record form.
Step 19.Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value (Iin).
Step 20. Calculate the resistance value as follows: R = Vin/Iin. Vin is the voltage measured by the
second DMM. Convert the input resistance (R) to Siemens by inverting the value: S = 1/R. The value in
Siemens should not exceed value listed in the test record under “Resistance Programming - Low
range, High resistance”.
Power Programming and Readback Accuracy
Test category = performance
This test verifies that the power programming and measurement functions are within specifications.
High Range
Step 1. Turn off the power system and connect the current shunt, DMM, and an external power supply
(see Test Setup H). Connect the DMM directly across the current shunt. Connect the second DMM
across the sense terminals.
Step 2. Turn on the power system and program the N679xA load settings as described in the test
record form under “Power Programming & Readback - High range, Minimum power”. 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 “CP”.
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.
Calculate the power as follows: P = Iin x Vin. Vin is the voltage measured by the second DMM. The
readings should be within the limits specified in the test record form for the appropriate model under
“Power Programming & Readback - High range, Minimum power”.
Step 5. Program the N679xA load settings as described in the test record form under “Power
Programming & Readback High range, High power”.
Step 6.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 reading measured over the
interface. Calculate the power as follows: P = Iin x Vin. Vin is the voltage measured by the second
DMM. The readings should be within the limits specified in the test record form for the appropriate
model under “Power Programming & Readback - High range, High power”.
6 Verification and Calibration
346 Keysight N6700C Operating and Service Guide
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