Calibrator Setup - Keysight Technologies DAQ970A Service Manual

2 Calibration Procedures

Calibrator setup

Connect the input cable shields to earth ground by connecting the calibrator's
output LO terminal to earth GROUND at the calibrator. It is important that the LO
to earth ground connection can be made at only one place in the circuit to avoid
ground loops as shown in following image:
The V-GUARD terminal is connected to the GROUND terminal via the shorting
NOTE
bar, and the output LO terminal is connected to the GROUND terminal with a
wire (Lug on the LO terminal, alligator clip to the shorting bar). This is mandatory
for low current measurements.
– Allow at least a 60-minute warm-up period for Fluke calibrator to stabilize.
– Perform DC zero calibration (it takes approximately 2.5 minutes to complete)
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from the front panel at least once every 30 days to ensure its performance
accuracy.
Keysight DAQ970A/DAQ973A Service Guide