Calibration Procedures 2
Keysight DAQ970A/DAQ973A Service Guide 55
Gain Adjustment
The DAQ970A/DAQ973A stores a single new gain correction constant each time
this procedure is followed. The gain constant is computed from the calibration
value entered for the calibration command and from measurements made
automatically during the adjustment procedure.
Most measuring functions and ranges have gain adjustment procedures. Only
diode, capacitance, 1 A, 10 A, and 100 A current ranges do not have gain
calibration procedures. The gain calibration value may be entered through the
front panel menu or over the remote interface.
Adjustments for each function should be performed ONLY in the order shown in
“Calibration Adjustment Sequence” on page 51.
Gain and flatness adjustment considerations
– The ADC and zero adjustment procedure must have been recently performed
prior to beginning any gain adjustment procedures.
– When performing a 4-wire ohms gain adjustment, a new gain correction
constant is also stored for the corresponding 2-wire ohms measurement
range.
– The instrument calculates and stores gain corrections for each input value. The
gain constant is computed from the calibration value entered for the
calibration command and from measurements made automatically during the
calibration procedure.
– The instrument stores new flatness correction constants each time this
procedure is followed. Flatness constants adjust the internal DMM for AC volts
and AC current measurements across the usable input frequency band. The
flatness constant is computed from the calibration value entered for the
calibration command and from measurements made automatically during the
calibration procedure.
NOTE
Never turn off the instrument during a gain adjustment. This may cause ALL
calibration memory for the present function to be lost.
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