Wattmeter

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G - Physics

01

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324/72

G01R 17/02 (2006.01) G01R 5/22 (2006.01) G01R 17/06 (2006.01) G01R 21/00 (2006.01)

Patent

CA 1233203

- 1 - Abstract: A differential thermal wattmeter of the type disclosed in US. Patent 4,045,734 is modified to remove undesirable in-phase a.c. ripple at the fundamental frequency in the feedback path. This result is achieved by a closed loop system in which the in-phase signal in the feedback path is detected and driven to zero by injecting sufficient signal in opposite polarity into the feedback path to cancel the ripple. The advantages are reduction of error and the ability to use standard, low cost components.

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