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Instrument with continuity capture feature

  • US 5,227,984 A
  • Filed: 03/08/1991
  • Issued: 07/13/1993
  • Est. Priority Date: 03/08/1991
  • Status: Expired due to Fees
First Claim
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1. An instrument for sensing changes in continuity comprising:

  • (a) input means for receiving continuity information from an electric circuit under test;

    (b) a comparator coupled to said input means for comparing said continuity information with a reference and producing a first output state representative of one of a short circuit condition and an open circuit condition in the electric circuit under test and subsequently producing a second output state representative of another of said short circuit condition and said open circuit condition for the same point in said electric circuit under test;

    (c) data storage means coupled to said comparator for receiving and storing said first output state of said comparator and producing a first continuity status output, and for receiving said second output state of said comparator subsequent in time to said first output state and producing a second continuity status output; and

    (d) processing means coupled to said data storage means for processing said first and second continuity status outputs of said data storage means to determine if a change in continuity status has occurred, indicating one of a short circuit-to-open circuit transition and an open circuit-to-short circuit transition and, if such a change in continuity status has occurred, capture said change and provide output data indicative of said one of said open-to-short transition and said short-to-open transition.

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