Keysight N6705 Service Manual page 18

2 Performance Verification
Constant Current Tests
NOTE
18
Test each output channel individually. Refer to the appropriate test
record form for the instrument settings of the model you are checking.
Current Programming and Readback Accuracy
Test category = performance, calibration
This test verifies that the current programming and measurement
functions are within specifications.
1
Turn off the DC 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.
2
Turn on the DC 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.
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".
4
Program the instrument settings as described in the test record form
under "Current Programming & Readback, High Current".
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".
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".
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
Model N6705 Service Guide