Electrical energy measuring multimeter

Details Electrical energy measuring multimeter Electrical energy measuring multimeter

1978-12-21

1981-03-17

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324142, G01R 700

Patent

active

042570042

ABSTRACT:
An electrical energy measuring multimeter for measuring electrical energy consumption is disclosed. The multimeter utilizes a first input signal that is proportional to the time derivative of a current delivered to a load. The first input signal is converted to a train of pulse signals. A second input signal that is proportional to a voltage delivered to the load is compared to a periodic reference signal. This comparison produces a gate command signal which controls a switch. The switch selectively connects the train of pulse signals to a totalizer. The sum of pulses in the totalizer is related to the time integral of the product of the current and voltage delivered to the load.

REFERENCES:
patent: 4056774 (1977-11-01), Shum
patent: 4182983 (1980-01-01), Heinrich et al.

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