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Method for identifying cable conductors using two signals at different frequencies

  • US 4,506,210 A
  • Filed: 02/18/1982
  • Issued: 03/19/1985
  • Est. Priority Date: 02/18/1982
  • Status: Expired due to Fees
First Claim
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1. A method for testing a cable comprising a plurality of conductors to identify which conductor at a second end of the cable is continuous with a selected conductor at a first end of the cable, the method comprising the steps of:

  • applying an alternating current signal to the selected conductor at the first cable end;

    applying a second alternating current signal of a frequency different from that of the first recited alternating current signal to a second conductor at the first end of the cable;

    capacitively coupling a high gain, high input impedance amplifier at the second end of the cable to a chosen conductor;

    amplifying and filtering the coupling signal in two parallel frequency selective filters tuned to the frequencies of said first and second recited alternating current signals, respectively; and

    comparing the amplitudes of said filtered signals to determine if said chosen conductor is said selected conductor.

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