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Electrical tester with electrical energizable test probe

  • US 5,367,250 A
  • Filed: 12/22/1992
  • Issued: 11/22/1994
  • Est. Priority Date: 06/11/1992
  • Status: Expired due to Fees
First Claim
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1. An instrument for performing electrical tests comprising;

  • a. a first power input terminal adapted for connection to the first polarity output terminal of a dc power source,b. a second power input terminal adapted for connection to a second output terminal of said dc power source, said second output terminal being of opposite polarity to said first terminal,c. a voltage divider having first input terminal connected to said first power input terminal, a second input terminal connected to said second power input terminal, and an output terminal,d. a first voltage responsive indicator device responsive to a voltage applied thereto, said indicator device having a first input terminal connected to said output terminal of said voltage divider, and a second input terminal,e. a second voltage responsive indicator device having a first input terminal connected to said output terminal of said voltage divider, and a second input terminal,f. a conductive probe conductively coupled to said second input terminals of said first and second indicator devices, whererby contacting said probe with an electrical potential different by at least a first threshold voltage from the voltage at the output terminal of said voltage divider causes said first indicator device to provide a first sensible indication, and said second indicator device to provide a second sensible indication when said probe is in electrically conductive contact with an electrical potential different from said output voltage of said voltage divider by at least a second threshold voltage, andg. a switch having a transfer contact connected to said probe, a first normally open contact connected to said first power input terminal, and a second normally open contact connected to said second power input terminal, whereby actuating said switch to a first active position causes said probe to be conductively coupled to said first power input terminal, and actuating said switch to a second active position causes said probe to be conductively coupled to said second power input terminal.

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