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Liquid gaging system self test circuitry

  • US 4,337,638 A
  • Filed: 05/14/1980
  • Issued: 07/06/1982
  • Est. Priority Date: 05/14/1980
  • Status: Expired due to Term
First Claim
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1. In a liquid gaging system, an apparatus for self testing the system, comprising:

  • excitation signal generator means for providing an excitation signal;

    precision resistor means for providing a precise resistive load;

    means for monitoring the precision resistor means, the means for monitoring comprising threshold detector means for determining whether the excitation signal has an amplitude above a predetermined threshold; and

    means for connecting the precision resistor means to the excitation signal generator means and to the means for monitoring.

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