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Method and apparatus for auto-calibration of signal conditioning electronics

  • US 4,642,636 A
  • Filed: 12/30/1983
  • Issued: 02/10/1987
  • Est. Priority Date: 11/16/1983
  • Status: Expired due to Term
First Claim
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1. Apparatus for conditioning and calibrating a raw electrical signal comprising:

  • a printed circuit board having an input termination for said raw electric signal, a conditioning circuit connected to the input termination for conditioning the raw electrical signal to generate a conditioned electrical signal and an output termination for outputting the conditioned electrical signal;

    test means for selectively disconnecting the conditioning circuit from the input termination and for connecting test signals of known magnitude to the conditioning circuit;

    processing means connected to said output termination, for calibrating the conditioning circuit by controlling said test means to connect said test signals to said conditioning circuit to generate conditioned test signals, generating a calibration factor as a function of said test signals and said conditioned test signals, operating said test means to reconnect said raw electrical signal to said conditioning circuit so that said conditioned electrical signal again appears on said output termination and applying said calibration factor to said conditioned electrical signal to generate a calibrated conditioned electrical signal; and

    monitoring means including temperature sensing means for sensing the temperature of said conditioning circuit, said processing means being responsive to the temperature sensed by said sensing means to perform said calibration when said temperature changes by a preselected amount since the last calibration.

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