Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1993-08-31
1995-03-28
Strecker, Gerard R.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324616, 379 26, 379 29, G01R 3102, H04M 326
Patent
active
054020735
ABSTRACT:
A method and apparatus (3, 60, 202, 300) for measuring the dynamic, or alternating current, and static, or direct current, characteristics of a cable pair (2, 10, 24, 133) from one end, the local end, by utilizing an element (1, 19, 20) possessing known non-linear electrical characteristics connected across the other end, the remote end, together with methods and apparatus (30, 111) for connecting the non-linear element (1) across the remote end of the cable pair (2, 10, 24, 133) and disconnecting the non-linear element 11) by means of electrical voltages impressed across the cable pair (2, 10, 24, 133) at the local end. In the method and system of the present invention, the near end test set (3, 60, 202, 300) is electrically transposed to the far end of the cable pair (2, 10, 24, 133) making it appear, to be at the far end during the test while, physically remaining at the near end. The non-linear element (1), in its non-linear region, when suitably excited by two or more alternating signals of different frequencies ( 4, 12, 13, 41, 42, 113, 114), produces additional frequencies which travel back from the far end to the near end of the cable pair (2, 10, 24, 133) and are modified by the characteristics of the cable pair (2, 10, 24, 133). By selecting specific excitation frequencies and measuring the characteristics of the additional frequencies returned (6, 22, 52, 200), the characteristics of the cable (2, 10, 24, 133) can be deduced.
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patent: 3952163 (1976-04-01), Couturier et al.
patent: 4170722 (1979-10-01), Blackburn
patent: 4408345 (1983-10-01), Yashiro et al.
Cave Bryan
Do Diep
Klein David M.
Strecker Gerard R.
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