Wattmeter

Details Wattmeter Wattmeter

1984-11-26

1986-12-09

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324 98, 324106, 324132, G01R 1702, G01R 1510, G01R 522

Patent

active

046282572

ABSTRACT:
A differential thermal wattmeter of the type disclosed in U.S. Pat. No. 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.

REFERENCES:
patent: 3842349 (1974-10-01), Cox et al.
patent: 4045734 (1977-08-01), Cox et al.
IEEE Trans. on Instrum. & Meas., Cox, L. et al., "A Differential Thermal Wattmeter . . . ", vol. IM-25, No. 4, Dec. 1976, pp. 553-557.
IEEE Trans. on Instrum. & Meas., Kusters, N. et al., "The Development of an Automatic-Reversing Differential Thermal Wattmeter", vol. IM-29, No. 4, Dec. 1980, pp. 426-431.
Conference: CPEM Dig. 1980, Conf. on Precision Electromagnetic Measurements, Braunschweig, Germany, Filipski, P., "New Approach to Reactive Current and Effective Reactive Power Measurement in Nonsinusoidal Systems", Jun. 1980, pp. 380-382.

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