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System and method for detecting sensor leakage

  • US 9,476,928 B2
  • Filed: 10/14/2014
  • Issued: 10/25/2016
  • Est. Priority Date: 04/28/2009
  • Status: Expired due to Fees
First Claim
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1. A sensor test system, comprising:

  • a case configured to house a circuit;

    a power source for producing a voltage;

    a cable electrically connecting a first sensor to the circuit;

    the first sensor comprising multiple connector pins and a grounded connector shell;

    wherein the circuit comprises;

    a high-impedance resistor connected between the power source and the multiple connector pins;

    a return line from the grounded connector shell to the power source, such that the voltage produced from the power source renders a contaminant conductive, in that the contaminant provides conductive path between the multiple connector pins and the grounded connector shell and produces a contamination voltage across the high-impedance resistor, while the contaminant also provides a contaminant resistance;

    a first comparator comparing the contamination voltage to a wire fault voltage;

    a second comparator comparing the contamination voltage to a passing sensor voltage; and

    a third comparator comparing the contamination voltage to a dirty sensor voltage;

    wherein the dirty sensor voltage is greater than the passing sensor voltage and less than a wire fault voltage.

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