Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-09-25
1983-11-01
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
340651, 340652, G01R 3102
Patent
active
044132280
ABSTRACT:
To inspect a radio speaker harness, two analyzer circuits are connected to the harness in sequence by a switching arrangement. Each analyzer circuit comprises a pair of opposite conductivity type transistors with their bases connected through the switching arrangement to one end of the harness. An indicator lamp in series with each transistor reveals its conductivity state. One transistor is biased to conduct when the harness-to-ground resistance is above a certain value and the other transistor is biased to conduct when that resistance is below another value higher than the first so that the energization of the indicator lamps indicates the integrity of the harness. One analyzer circuit is connected by the switching means to one end of the harness while the other end is open to check the harness for short to ground and a predetermined electrical resistance to ground. The other analyzer circuit is connected to an end of the harness by a switch while the other end is grounded for checking the continuity of the harness and speaker arrangement.
REFERENCES:
patent: 3284707 (1966-11-01), Clinton
patent: 3412392 (1968-11-01), Jenkins et al.
patent: 3551796 (1970-12-01), Holder et al.
patent: 3872384 (1975-03-01), Laass
patent: 4233560 (1980-11-01), Blenman
patent: 4236146 (1980-11-01), Clark et al.
Balchunas, Audible Test Set for Detecting Opens and Mixed Gauges in, and Incorrect Lengths of Cable Conductors, Western Elec. Technical Digest No. 33, Jan. 1974, pp. 7, 8.
General Motors Corporation
Hill Warren D.
Krawczewicz Stanley T.
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