Telephone cable splicers test set and method of testing

Details Telephone cable splicers test set and method of testing Telephone cable splicers test set and method of testing

1981-12-14

1983-11-29

Schreyer, Stafford D.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

1791753F, 324 51, H04B 346, G01R 3108

Patent

active

044182503

ABSTRACT:
Method and apparatus for testing pairs of conductors of a telephone cable, including method and apparatus for measuring the capacitance of a circuit component such as a pair of conductors. The capacitance of each of twenty-five pairs of conductors of a cable is measured and the capacitance value is stored, the median value of capacitance is identified and stored, each measured capacitance value is compared with the median value, and an out-of-limits indication is made when a measured capacitance value deviates from the median value by more than a predetermined limit. Capacitance is measured by connecting the circuit component, such as a pair of conductors, in the timing circuit of a monostable multivibrator, charging and discharging the timing circuit to vary the elapsed time of the on output of the multivibrator. The multivibrator controls the output of an oscillator and the oscillator output pulses are counted, with the count total varying as a function of the capacitance of the conductor pair. The instrument may be calibrated to read out directly in capacitance if desired.

REFERENCES:
patent: 3944914 (1976-03-01), Simmonds
patent: 4173736 (1979-11-01), Adams

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