Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1993-01-13
1994-08-09
Snow, Walter E.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324713, 338 49, 338322, G01R 2708
Patent
active
053369904
ABSTRACT:
An electrical test shunt having a pair of female contacts each having two contact points for relocating voltage sensing points of a test shunt to provide a first circuit path with an adequate current flow that is independent of a second circuit path for reading the voltage drop across the same electrical test shunt. The voltage is read by a high input impedance voltage comparator. The input impedance of the voltage comparator is great enough to negate the affect of the internal resistance inherent in the mating terminals of the shunt. The two circuit paths are made possible in part by the implementation of a pair of terminals which each have two independent electrical contact areas. The terminal contact is typically inserted into the female receptacle formed by the two separate (i.e. electrically isolated) electrically conducting contact points. The female terminal is preferably mounted in a suitable printed circuit board. When the terminals are inserted into the mating female contacts, the two electrically independent circuit paths are formed. One circuit path allows for easily and accurately measuring the voltage drop across the shunt, while the other allows adequate current flow to the load for testing purposes. The resistances of the contact points which are coupled to the voltage comparator are further coupled outside the current loop in which the load current flows.
REFERENCES:
patent: 3059182 (1962-10-01), Smith
patent: 4034289 (1977-07-01), Rozylowicz et al.
patent: 4494068 (1985-01-01), Ley et al.
"A Comprehensive Guide To Resistive Shunts and Current Sensors", Vishay Electronic Components, Catalog CO191, Jan. 1991, pp. 1-18.
Brown Glenn W.
Snow Walter E.
United Technologies Automotive Inc.
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