Instrument for measuring true-RMS A.C. voltage and A.C. voltage

Details Instrument for measuring true-RMS A.C. voltage and A.C. voltage Instrument for measuring true-RMS A.C. voltage and A.C. voltage

1980-02-05

1982-08-24

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Nonlinear

328144, 364483, G01R 1510, G01R 1902

Patent

active

043463460

ABSTRACT:
A line voltage monitor which can measure d.c. and RMS a.c. voltage and frequency, maximum and minimum RMS voltage, which displays input voltage, and computes and displays % regulation from the measured maximum and minimum voltage values. Analog input circuitry attenuates and squares the input voltage. A voltage-to-frequency converter produces logic pulses at a rate proportional to the squared signal. A 16-bit counter integrates V.sup.2 by accumulating pulses from the voltage-to-frequency converter. A second 16-bit counter increments at a 1 MHz rate to determine the cycle period T of the input. A microcomputer divides the .intg.V.sup.2 value by the period T and then takes the square root, yielding the RMS value of the input voltage. The microcomputer can be switched to determine the % regulation and the input frequency, and can be used to enable display of V.sub.max, V.sub.RMS (t) or V.sub.min, as well as the regulation.

REFERENCES:
patent: 3845388 (1974-10-01), Ley et al.

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