A digital wattmeter, based upon a commercially-available Hall-effect transducer is described. The wattmeter is easily constructed and calibration requires only an a.c. voltmeter. At power frequencies the accuracy is within 1% of full-scale reading, when used in single-phase circuits, and within 1.25% in balanced three-phase circuits.
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References
1.
BishopJ., ‘A review of wattmeters suitable for use with distorted waveforms’Royal Aircraft Establishment Technical Report 74097
2.
HillJ. J., ‘A precision thermo-electric wattmeter for power and audio frequencies’Proc. IEE105B (1958).
