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Wheatstone Bridge Output & Nonlinearity

Two Active Gages

Description (Note 1)     Two active gages with equal strains of the same sign -- used on opposite sides of column with low thermal gradient (bending cancellation, for instance.)

Output Equation (Note 2)     mV/V ( Nonlinear )

Nonlinearity    

Actual Strain    

where:

  = gage factor of both gage and instrument
  = actual strain, in uniaxial tension or compression, in the axial direction
  = total strain indicated by the strain gage instrument
  = uncorrected axial strain



Note 1 : The resistance of each arm in a branch between the power corners of the bridge is nominally the same for both arms.
Note 2 : A constant-voltage power supply is assumed. Both and are expressed in microstrain units.