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Self-calibrating automatic zeroing strain gauge circuit

  • US 4,213,348 A
  • Filed: 08/01/1979
  • Issued: 07/22/1980
  • Est. Priority Date: 08/01/1979
  • Status: Expired due to Term
First Claim
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1. A circuit for calibrating and providing an output from a strain gauge after said strain gauge is fitted to an object to be measured comprising:

  • a constant current source for providing a constant current in said strain gauge;

    a source of a reference voltage;

    means responsive to an error signal corresponding to a difference between a voltage drop across said strain gauge due to said constant current and said reference voltage during a predetermined time period for adjusting the magnitude of the current from said current source in said strain gauge to reduce said difference between said strain gauge voltage drop and said reference voltage; and

    means responsive to a difference between said voltage drop across said strain gauge and said reference voltage after said adjusting of said current in said strain gauge for providing an output of said voltage difference relative to said reference voltage.

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