Calibration Procedures 3
Keysight 34980A Service Guide 51
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 MΩ range does not have gain calibration procedures.
Adjustments for each function should be performed ONLY in the order shown in
the performance verification table. See “Performance Verification Tests” on
page 38 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.
– 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. If the 2-wire Ohms gain is adjusted
separately, the 2-wire Ohms function will not meet specifications when offset
compensated Ohms is used.
– 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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