Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1990-06-14
1992-06-16
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324103R, 364483, G01R 2100, G01R 2106
Patent
active
051227355
ABSTRACT:
A digital power meter achieves enhanced accuracies through the utilization of a sequence of meter stage improvements. Such improvements include the utilization of a digital phase shift based cycle phase realignment following the scaling function of the meter. The cycle phase corrected signals are digitized utilizing a sampling procedure wherein two samples of both current and voltage are taken within a precisely defined sampling interval. These samples are improved by the application thereto of a truncation correction and are averaged prior to being combined to provide quantity signals such as watt, VAR, volt, amperes, and the like. By developing subinterval transfer of components of these quantities to an overflow register, errors otherwise occurring at this stage of metering are substantially eliminated.
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Hammond Scott H.
Porter Lawrence R.
Burns William J.
TransData, Inc.
Wieder Kenneth A.
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