Step 5. Program the N679xA load settings as described in the test record form under “Current
Programming & Readback, High current”.
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. The readings should be within the limits specified in the test record form for the appropriate
model under “Current Programming & Readback, High current”.
Low Range
Step 7. Program the N679xA load settings as described in the test record form under “Current
Programming & Readback - Low range, Minimum current”.
Step 8. 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. The readings should be within the limits specified in the test record form for the appropriate
model under “Current Programming & Readback, Low range, Minimum current”.
Step 9. Program the N679xA load settings as described in the test record form under “Current
Programming & Readback - Low range, Low current”.
Step 10. 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. The readings should be within the limits specified in the test record form for the appropriate
model under “Current Programming & Readback, Low range, Low current”.
Resistance Programming Accuracy
Test category = performance
This test verifies that the resistance programming is within specification. The programmed resistance
values are checked by recording the voltage across the current monitor resistor and the input voltage
(voltage at the modules + and – sense terminals ), then calculating the resistance as follows;
Resistance = Input Voltage / ( voltage across current monitor / monitor resistor value )
The Resistance value must then be converted to Siemens by inverting the value: S = 1/R
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 for “Resistance Programming - High range, Minimum resistance”. 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 “CR”
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).
6 Verification and Calibration
344 Keysight N6700C Operating and Service Guide
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