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Detection circuit for measurement of test lead and using the same

  • US 20080088317A1
  • Filed: 10/13/2006
  • Published: 04/17/2008
  • Est. Priority Date: 07/12/2006
  • Status: Active Grant
First Claim
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1. A detecting circuit for detecting the contacting condition of a test lead with a split contact jack of an electrical measuring instrument, said plugged test lead detecting circuits comprising:

  • a shunt coupled to ground and first terminal of said split contact jack;

    an oscillating unit coupled to second terminal of said split contact jack through a protecting unit for generating a pulse or a quiescent state output; and

    a recognizing unit coupled to said oscillating unit for receiving an output signal transmitted from said oscillating unit, and determining a condition of said plugged test lead detecting circuits by utilizing said oscillating unit.

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