Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-03-06
1979-11-06
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 60C, 331 65, 331113R, 331144, G01R 3104, G01R 2726, H03K 3284
Patent
active
041737369
ABSTRACT:
A computer controlled facility is provided to detect capacitance, and hence defective connections, between a group of wires in a telephone handset cord and terminal blades of plugs connected at both ends of the cord. The test depends upon ascertaining the capacitance between a properly connected terminal blade and wire and the other terminal blade and wire connections to provide exact indications of the terminal blades and wires which are not properly connected. Capacitance is detected by connecting a good wire and blade connection along with another wire and blade in a capacitance network associated with one stage of a free running multivibrator which produces an output wave in accordance with the capacitance between the connected pairs of wires and blades. A delayed pulse is cyclically generated to act in conjunction with the output wave to control a bank of indicator lights to provide an indication of any defective wire to blade connections.
REFERENCES:
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patent: 2490377 (1949-12-01), MacLean
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patent: 3389789 (1968-06-01), Watson et al.
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patent: 4091671 (1978-05-01), McLees
DC and Low-Frequency Line Testing, Electrical Engineer's Handbook, 4th Edition, Pender-McIllwain, Copyright 1950, pp. 11-41, 42.
Miller R. P.
Strecker Gerard R.
Western Electric Company, Incorporated
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