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Which of the following would NOT reduce the temperature error of a strain gauge installation?

  • A.increasing the bridge excitation voltage
  • B.using a dummy gauge in the adjacent bridge arm
  • C.selecting a gauge alloy matched to the material under test
  • D.arranging a full bridge with gauges in tension and compression

Answer: A

More excitation increases the output but also the self-heating, so the temperature error grows rather than shrinks. The other three all arrange for temperature effects to be common to arms in which they cancel, or to be small in the first place.

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