Method and apparatus for measuring current, especially useful in

Details Method and apparatus for measuring current, especially useful in Method and apparatus for measuring current, especially useful in

1978-01-20

1980-01-29

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324126, G01R 2106

Patent

active

041863399

ABSTRACT:
The disclosed method and apparatus make three connections to a pair of conductors: two at spaced-apart points on one conductor and the third on the other conductor. Using the power available in the conductors, a differential amplifier produces an output signal representative of current flow through the first conductor by sensing the voltage difference between the first and second connections to the first conductor. Temperature-induced changes in the resistance of the first conductor are compensated by a thermistor. The output signal is used to drive one or more displays of amperes, ampere-hours or watt-hours.

REFERENCES:
patent: 720335 (1903-02-01), Eastman
patent: 1446995 (1923-02-01), Sines
patent: 1590970 (1926-06-01), Fritz
patent: 2362372 (1944-11-01), Halfmann
patent: 2724821 (1955-11-01), Schweitzer, Jr.
patent: 3197702 (1965-07-01), Schweitzer, Jr.
patent: 3428896 (1969-02-01), Schweitzer, Jr.
patent: 3460042 (1969-08-01), Harner

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