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Measuring shield breaks in coaxial cable by a sheath test current

  • US 5,990,687 A
  • Filed: 05/29/1997
  • Issued: 11/23/1999
  • Est. Priority Date: 05/29/1997
  • Status: Expired due to Term
First Claim
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1. A test system for finding a break in a shield of a coaxial cable, the test system comprising:

  • a transmitter having an output that supplies a reference test signal;

    a transformer for magnetically inducing the reference test signal onto the shield of the coaxial cable comprisinga primary winding connected to the output of the transmitter;

    a secondary winding comprising a portion of the shield of the coaxial cable; and

    a magnetic coupling device for magnetically coupling the primary and secondary windings; and

    a receiver connected to a center conductor of the coaxial cable, for receiving a signal induced from the shield to the center conductor, and for indicating when the magnitude of the induced signal received exceeds the magnitude of the induced signal received from an unbroken coaxial cable, thereby indicating a shield break is present in the coaxial cable.

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