Calibration Procedures 4
Keysight 34970A/34972A Service Guide 89
Gain Adjustment
The Internal DMM 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 the
100 MW range does not have gain calibration procedures. The gain calibration
value may be entered through the front panel menu or over the remote interface.
See page 56, for an example of how to enter calibration values.
Adjustments for each function should be performed ONLY in the order shown in
the performance verification table. See “Performance Verification Tests” earlier in
this chapter for the tables used for gain adjustments.
Gain Adjustment Considerations
– The zero adjustment procedure must have been recently performed prior to
beginning any gain adjustment procedures.
– The optional –10 VDC adjustment should be performed only after servicing the
Internal DMM’s a-to-d converter or after replacing network A4U101 or
calibration RAM A4U505.
– When performing a 4-wire ohms gain adjustment, a new gain correction
constant is also stored for the corresponding 2-wire ohms measurement
range. If desired, the 2-wire gain can be adjusted separately after the 4-wire
ohms gain calibration is completed.
– During the AC voltage gain adjustments, some of the DC voltage gain
constants are used. Perform the DC voltage gain calibration before the AC
voltage gain calibration.
Never turn off the instrument during a Gain Adjustment. This may cause
calibration memory for the present function to be lost.
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