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Circuit tracer having an electric field sensor, a differential electric field sensor and an inductive sensor

  • US 5,444,364 A
  • Filed: 06/28/1994
  • Issued: 08/22/1995
  • Est. Priority Date: 09/29/1992
  • Status: Expired due to Fees
First Claim
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1. A device for indicating the direction to an electrical conductor which is connected to an alternating voltage source, comprising:

  • a housing;

    electric field sensor means located in said housing, and having a front face, for generating a first signal based upon the angular location, relative to said front face, of any electric field emanating from the conductor;

    differential electric field sensor means, located in said housing and having first and second generally parallel surfaces, for generating a second signal from a first location based upon the electric field potential emanating from the conductor, and a third signal from a second location based upon the electric field potential emanating from the conductor;

    inductive sensor means, located in said housing, for generating a fourth signal based upon a magnetic field generated by any current in the conductor;

    switch means, located in said housing, connected to said electric field, differential electric field and inductive sensor means, and having three settings corresponding to said electric field, differential electric field and inductive sensor means, respectively, for selectively outputting an output signal comprising either (i) said first signal, (ii) a fifth signal approximately equal to the difference of said second and third signals, or (iii) said fourth signal;

    processing means for receiving said output signal from said switch means and for calculating a signal value based thereon; and

    means, connected to said processing means, for displaying said signal value.

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