Device for measuring power using switchable impedance

Details Device for measuring power using switchable impedance Device for measuring power using switchable impedance

1998-07-08

2000-11-14

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324141, G01R 2100

Patent

active

061474843

ABSTRACT:
A device for measuring power, or other circuit parameters, of an alternating current load. The device has an ammeter and voltmeter for measuring voltage across the device and current through the device. The device also has a known impedance element that is switchably connected across the load. The ammeter is used to provide a second current measurement with the impedance so connected. These measurements, together with the known impedance value, are use to calculate power, the power factor, impedance, or some other parameter associated with the load.

REFERENCES:
patent: 4120031 (1978-10-01), Kincheloe et al.
patent: 4401943 (1983-08-01), Morris
patent: 4814996 (1989-03-01), Wang
patent: 4977515 (1990-12-01), Rudden et al.
patent: 5315236 (1994-05-01), Lee
patent: 5869960 (1999-02-01), Brand

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