Voltage, current and frequency measuring of non-standard wavefor

Details Voltage, current and frequency measuring of non-standard wavefor Voltage, current and frequency measuring of non-standard wavefor

1987-09-08

1988-10-18

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 78D, G01R 2316

Patent

active

047790440

ABSTRACT:
A regularly repetitive, almost periodic but non-regularly shaped waveform is amplitude sampled at an interval different from that of the waveform under investigation. For a voltage measurement, the positive samples are averaged for a predetermined count number (one set) and the negative samples are likewise averaged. Zero value samples are ignored. The highest absolute value of the two is taken as a meaningful measurement. Alternatively, one of these values can be selected. For a current measurement, a running average for a predetermined number of sets can also be developed. Finally, frequency can be developed by sensing the transitions and operating a counter on/off at the beginning and ending of a waveform cycle. The count of regular interval counts is then multiplied by the interval time to give the period of the waveform. The reciprocal of the period is a measure of the frequency.

REFERENCES:
patent: 3938042 (1976-02-01), Gliever
patent: 4093850 (1978-06-01), Karnowski et al.
patent: 4310795 (1982-01-01), Fremerey
patent: 4468614 (1984-08-01), Takahashi et al.
patent: 4646744 (1987-03-01), Capel
patent: 4680540 (1987-07-01), Niki et al.

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