Swept frequency domain relectometry enhancement

Details Swept frequency domain relectometry enhancement Swept frequency domain relectometry enhancement

1990-11-05

1991-11-26

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324605, 324642, 324644, 324647, G01R 3102

Patent

active

050686143

ABSTRACT:
An improved swept frequency domain reflectometry instrument has an input/output terminal coupled to one end of a cable. A radio frequency at the input/output terminal is converted to an intermediate frequency using a swept local frequency. The radio frequency is derived from the swept local frequency and a variable offset frequency. A controller controls the variable offset frequency, monitoring the amplitude of the intermediate frequency. A period counter counts the intermediate frequency at a first maximum response of the intermediate frequency and further counts the offset frequency at a second maximum response of the intermediate frequency. The location of a discontinuity in the cable is calculated from the counted frequencies.

REFERENCES:
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patent: 3771056 (1973-11-01), Zimmerman
patent: 4077899 (1978-02-01), Shimp
patent: 4734637 (1988-03-01), Chen et al.
patent: 4766386 (1988-08-01), Oliver et al.
patent: 4812738 (1989-03-01), Itaya et al.
patent: 4816767 (1989-03-01), Cannon et al.

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