Test system for locating breaks and short circuits in a...

Details Test system for locating breaks and short circuits in a... Test system for locating breaks and short circuits in a...

H - Electricity

04

B

379/2, 324/58.3

H04B 3/46 (2006.01) G01R 31/02 (2006.01) H04M 3/30 (2006.01)

Patent

CA 1180387

ABSTRACT OF THE DISCLOSURE The system locates breaks and short circuits in a two-lead line with respect to a test device inserted in the line. Provide at one remote end of the line is an apparatus for selectively applying a voltage and a current. The test device comprises a circuit in parallel with the line leads for transmitting a first frequency signal along the line which modulates the current in response to the applied voltage when no break is existing between the remote apparatus and the test device, and a circuit in series on one of the line leads for transmitting a second frequency signal along the line which modulates the line current in response to the applied current when no short circuit is existing between the remote apparatus and the test device. The remote end of the line is selectively connected to first and second frequency de- tectors. The line can be a subscriber loop including a telephone subscriber installation at the other end.

394330

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