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Wheatstone Bridge Output & Nonlinearity

Four Active Gages

Description (Note 1)     Four active gages with pairs subjected to equal and opposite strains (beam in bending or shaft in torsion).

Output Equation (Note 2)     mV/V

Nonlinearity Effects     (No nonlinearity errors.)

Actual Strain     microstrain

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.