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Sensitivity coding circuit for an electronic instrument

  • US 3,943,440 A
  • Filed: 10/03/1974
  • Issued: 03/09/1976
  • Est. Priority Date: 10/03/1974
  • Status: Expired due to Term
First Claim
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1. A transducer sensitivity coding circuit for an electronic instrument having measurement circuits and a remote transducer unit connected to the electronic instrument by a cable, the electronic instrument employing different transducers for different measurement ranges, the transducer sensitivity coding circuit automatically providing information to the electronic instrument of the transducer sensitivity comprising:

  • a fixed value resistor mounted in the transducer unit having a value indicative of the sensitivity of a particular transducer unit;

    a current supply circuit in the electronic instrument connected to the cable for supplying a current to the resistor to develop a resistor voltage across the resistor; and

    comparator means in the electronic instrument, connected to the cable and the measurement circuits, for comparing the resistor voltage with a plurality of reference voltages for producing a signal indicative of the value of the resistor in the transducer unit to adjust the sensitivity of the measurement circuits.

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