New form of digital wattmeter using a double dual-slope principle

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New form of digital wattmeter using a double dual-slope principle

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© The Institution of Electrical Engineers
Published

A proposed a.c. digital watt/joule meter is described, which combines the principle of the well known dual-slope analogue-digital convertor with that of the sampling digital wattmeter to provide a system where multiplication, digitising, averaging and integration may be performed by using relatively few components.

Inspec keywords: power measurement; analogue-digital conversion; wattmeters; digital instrumentation

Other keywords: integration; averaging; sampling digital wattmeter; AC digital watt/joule meter; dual slope A/D conversion; double dual slope operation; digitising; multiplication; operation

Subjects: Power and energy measurement; Display, recording and indicating instruments; Power system measurement and metering

References

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      • Turgel, R.S.: `Sampling techniques for electric power measurement', 870, NBS Technical Note, June 1975.
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      • R.B.D. Knight , J.R. Stockton . Development of the Chung and Bedrosian iterative digital cellular multiplier. Electron. Lett. , 182 - 183
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      • R.S. Turgel . Digital wattmeter using a sampling method. IEEE Trans. , 337 - 341
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      • Dix, C.H.: `Calculated performance of a sampling wattmeter', NPL DES memorandum 17, January 1975.
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      • W. Ritmanich , D. Langley , I. Wold . 13-bit monolithic CMOS A/D converter. Analog Dialogue , 3 - 5
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      • D. Kress , R. Wagner . Monolithic sample-hold amplifiers. Analog Dialogue , 6 - 7
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      • A. Gookin . A faster integrating analog-to-digital converter. Hewlett-Packard J.
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      • Ikeda, Y.: `An experimental investigation into the feasibility of a digital computing wattmeter', NPL DES memorandum 21, February 1976.
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      • J.D. Watson . A low cost precision A/D system. Electron. Ind. , 21 - 25
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