Differential thermal wattmeter

Details Differential thermal wattmeter Differential thermal wattmeter

G - Physics

01

R

324/77

G01R 21/02 (2006.01)

Patent

CA 1068786

TITLE DIFFERENTIAL THERMAL WATTMETER INVENTORS Louis G. Cox Norbert L. Kusters ABSTRACT OF DISCLOSURE The differential thermal wattmeter for the ac/dc transfer of power includes a differential thermal con- verter 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.

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