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Leadless probe

  • US 3,919,631 A
  • Filed: 07/05/1973
  • Issued: 11/11/1975
  • Est. Priority Date: 07/05/1973
  • Status: Expired due to Term
First Claim
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1. A probe for indicating electrical continuity comprising:

  • a hand-held body, said body comprising an outer tubular electrically conductive portion for making electrical connection with the hand of a user;

    an electrical connecting member supported by said body and electrically insulated from said outer tubular electrically conductive portion, said electrical connecting member including a threadably received removable tip connection;

    a high input impedance amplifier housed in said body, said amplifier comprising a Darlington transistor amplifier having an input directly coupled to the electrical connecting member;

    an output means integral with said body and responsive to said amplifier for producing an output; and

    a power supply housed in said body and directly electrically connected to said outer tubular electrically conductive portion, said power supply acting alone to energize said output means through an electrically continuous path, said path including, in electrical series, said power supply means, said outer tubular electrically conductive portion, the hands and body of the user, a device under test, said electrical connecting member, said high impedance amplifier, and said output means, whereby the electrical continuity of said device under test may be indicated.

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