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The excitation of a strain gauge bridge is kept modest chiefly to limit

  • A.the nonlinearity of the bridge output with strain
  • B.self-heating of the gauges
  • C.the current drawn from the power supply of the instrument
  • D.the electromagnetic interference radiated by the bridge

Answer: B

The gauge is a resistor cemented to the specimen, and power dissipated in it warms both, producing an apparent strain. Manufacturers quote a permissible power density that depends on how well the backing material conducts heat away.

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