Rms converter for obtaining fast rms measurements

Details Rms converter for obtaining fast rms measurements Rms converter for obtaining fast rms measurements

G - Physics

01

R

G01R 19/25 (2006.01) G01R 19/02 (2006.01)

Patent

CA 2247572

An rms (root mean square) converter for obtaining fast rms measurements of power line signals having a frequency of either 50 Hertz or 60 Hertz is provided. The digital samples of the power line frequency signal that arrive at the rms converter are squared and summed in an averaging circuit At the end of each rms measurement period, an average value is provided to a square root circuit which calculates the rms value. The rms measurement period has been chosen to be 50 milliseconds to span the minimum integer number of cycles of the squared of the power line signal, either six cycles for the 60 Hertz frequency or five cycles for the 50 Hertz frequency, to provide rms values at a rate up to 20 rms values per second.

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