Differential thermal wattmeter

Details Differential thermal wattmeter Differential thermal wattmeter

1976-05-24

1977-08-30

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324106, 324132, G01R 2102

Patent

active

040457346

ABSTRACT:
The differential thermal wattmeter for the ac/dc transfer of power includes a differential thermal converter as a "sum and difference" multiplier, with both ac and dc voltage and current signals simultaneously applied to both heaters. DC feedback to the current input speeds up the response and maintains thermal balance between the heaters, so that the output meter becomes a null indicator. This reduces and can eliminate the need for quadratic response. The requirement for exact matching of the thermal converters is also eliminated by effective interchange of the heaters.

REFERENCES:
patent: 3486014 (1969-12-01), Richman
patent: 3723845 (1973-03-01), Duckworth
patent: 3842349 (1974-10-01), Cox
patent: 3911359 (1975-10-01), Metcalf

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