Time-domain reflectometer

Details Time-domain reflectometer Time-domain reflectometer

2011-07-12

2011-07-12

Nguyen, Vincent Q (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S533000

Reexamination Certificate

active

07977950

ABSTRACT:
The present invention provides a time domain reflectometer for testing an electrical cable. The time domain reflectometer includes a test signal generator, at least one line feed resistor, connected between the test signal generator and a pair of terminals, for connection to the ends of the electrical cable under test, and a signal processor, connected to the terminals, to receive a line signal including a reflection of a test signal transmitted into the cable under test. The signal processor is programmed to filter the line signal to enhance a portion of the signal indicative of any fault on the cable by balancing the signal according to the electrical characteristics of a normal cable of the same type as the cable under test by applying a filter function, and acquiring at least one estimate of the input admittance of the transmission line from known or estimated electrical characteristics of the cable under test.

REFERENCES:
patent: 5600248 (1997-02-01), Westrom et al.
patent: 7250771 (2007-07-01), Lo et al.
patent: 2344239 (2000-05-01), None
patent: 3072724 (1991-03-01), None
patent: 2005104507 (2005-11-01), None

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