Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1987-10-14
1990-05-01
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324107, 324130, G01R 2100, G01R 2106
Patent
active
049221892
ABSTRACT:
An electric power measuring device wherein input analog signals representative of instantaneous values of current and voltage are applied to a multiplier (23) and the product applied to a converter (35, 37, 41, 43, 45, 47) to provide a pulse output signal having a frequency representative of the product and hence of the level of power consumption. Compensation for offset errors in the multiplier is effected by periodically reversing the polarity of one of the inputs to the multiplier and effecting corresponding reversals at the input to the converter to avoid irregularities in the output pulse rate when the level of power consumed is low.
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Dunn Trevor R.
Joyce Timothy R.
Lucas David R. S.
North Ben B.
Burns W.
Eisenzopf Reinhard J.
The General Electric Company p.l.c.
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