Keysight Technologies N6705C, Operating And Service Manual

Page: 382 / 476

Constant Current Tests
Current Programming and Readback Accuracy
Test category = performance, calibration
This test verifies that the current programming and measurement functions are within specifications.
Step 1. Turn off the power analyzer and connect the current shunt directly across the output
terminals. Connect the DMM directly across the current shunt (see
Test Setup B ). Note that the
electronic load is not used in this portion of the test.
Step 2. Turn on the power analyzer and program the instrument settings as described in the test
record form under “Current Programming & Readback, Min Current”. The output status should be
“CC”, and the output voltage should be close to zero.
Step 3. Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value (Iout). 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, Minimum Current”.
Step 4. Program the instrument settings as described in the test record form under “Current
Programming & Readback, High Current”.
Step 5.Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value (Iout). 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”.
Step 6. For models N6761A and N6762A only. Connect the Keysight 3458A directly across the output
(see Test Setup D without the resistor). Set the Keysight 3458A to the 100 mA range (no autoranging).
Set both the current programming and the current measurement functions to the low range. Set the
instrument as described under “Current Programming & Readback, Low Current”. Record the current
reading of the 3458A. Also, record the current reading measured over the interface. The readings
should be within the limits specified under “Current Programming & Readback, Low Range”.
Step 7. For models N6761A and N6762A with option 2UA only. Connect the Keysight 3458A and a 20k
resistor to the output (see Test Setup D ). Set the Keysight 3458A to measure current using the 1 mA
range. Set the current measurement to the 200 μA range. Set the instrument as described in the test
record form under “Current Readback, 200 μA Current”. Record the current reading of the Keysight
3458A and the current measured over the interface. Readings should be within limits specified for the
appropriate model under “Current Readback, 200μA Range”.
Step 8. For models N6763A–N6766A, and N6783A only. Set the current measurement to the low
range. Set the instrument as described under “Current Readback, Low Current”. Repeat step 5.
Record the current measured over the interface. The readings should be within the limits specified
under “Low Current Readback Low Range”.
8 Verification and Calibration
382 Keysight N6705C Operating and Service Guide