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In 1843 the English physicist, Sir Charles Wheatston (1802-1875), found a bridge circuit for measuring electrical resistances. In this bridge circuit, known today as the Wheatstone bridge circuit, unknown resistances are compared with well-defined resistances.

The Wheatstone bridge is also well suited for the measurement of small changes of a resistance and is, therefore, also suitable for measuring the resistance change in a strain gage (SG). It is commonly known that the strain gage transforms strain applied into a proportional change of resistance. ...

Contents of the brochure

  • Elementary circuits with strain gages (measurements on a tension bar, bending beam and a twisted shaft)
  • Analysis and compensation of superimposed stresses, e.g. tension bar with bending moment
  • Compensation of interference effects, especially temperature effects
  • Compensation of the influence of lead resistances
  • Table on different circuit configurations
  • Some remarks on the limits of the compensation of interference effects
  • The linearity error of the Wheatstone bridge circuit.
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