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Method and apparatus for compensating a sensor

  • US 4,198,677 A
  • Filed: 01/30/1978
  • Issued: 04/15/1980
  • Est. Priority Date: 01/30/1978
  • Status: Expired due to Term
First Claim
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1. The method of using a sensor producing an analog signal with a processing means comprising the following calibration steps:

  • converting a digital output value from said processing means to an analog signal value;

    comparing the sensed analog signal value with the converted digital output value;

    changing the digital output value of said processing means in the absence of a predetermined relationship between the analog signal value and the converted digital output value;

    reiterating the foregoing steps until a predetermined relationship exists between the analog signal value and the digital output value;

    repeating the foregoing steps for different instantaneous analog signal values; and

    storing at least one of said digital output values having said predetermined relationship in said processing means so as to represent a selected characteristic of said analog signal;

    said method further comprising the following measuring steps;

    generating a sensor calibrated digital output value at the output of said processing means from said at least one of said stored digital output values;

    converting said sensor calibrated digital output value to a calibrated analog signal valuecomparing the calibrated analog signal value to said analog signal.

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