Apparatus for determination of the location of a fault in commun

Details Apparatus for determination of the location of a fault in commun Apparatus for determination of the location of a fault in commun

1988-09-30

1989-04-11

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324 60CD, 379 26, G01R 3108, G01R 1152, G01R 2726

Patent

active

048209910

ABSTRACT:
An improved instrument for determining the distance to an open fault in a communications line, the instrument taking advantage of the predictable relationship between the current discharge rate in a reference capacitor and resistor and the current discharge rate in a faulty line whose capacitance is a function of the distance to the fault. Provisions are made to keep the meter readings within the usable scale of the meter of the invention by allowing the operator to select from among a range of driving signal frequencies to suit the distance to the fault. Calibration may be made by reference to an internal capacitor or by means of measuring a known length of open circuited line of the type to be tested. Provision is also made to provide for "tuning out" "dirty" short circuits.

REFERENCES:
patent: 3944914 (1976-03-01), Simmonds
patent: 4032841 (1977-06-01), Knippelmier
patent: 4103225 (1978-07-01), Stephens
patent: 4404481 (1983-09-01), Ide et al.

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