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Automatic calibration of sensor circuits in gear shapers

  • US 4,542,638 A
  • Filed: 09/16/1983
  • Issued: 09/24/1985
  • Est. Priority Date: 09/16/1983
  • Status: Expired due to Term
First Claim
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1. An apparatus for calibrating a sensor output by producing a corrected sensor output, said sensor for producing an analog electrical output signal representative of a predetermined sensed parameter, comprising:

  • a signal conditioning circuit operatively connected to condition said output signal;

    a reference signal means for producing first and second reference signals;

    multiplexer means connected to said reference signal means and interposed betwen said sensor and said signal conditioning circuit for selectively passing said output signal or either of said first and second reference signals to said signal conditioning circuit;

    an analog to digital converter operatively connected to the output of said sensor and said signal conditioning circuit; and

    digital control means operatively connected to said converter output, said multiplexer and said reference signal means for periodically determining predetermined characteristics of said sensor and said signal conditioning circuit and for utilizing said predetermined sensor output signal, wherein said predetermined characteristics comprise the actual gain and output offset of said signal conditioning circuit utilizing said first and second reference signals as inputs thereto, and the output offset of said sensors.

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