Recirculating rms ac conversion method and apparatus

Details Recirculating rms ac conversion method and apparatus Recirculating rms ac conversion method and apparatus

G - Physics

01

R

324/59

G01R 19/02 (2006.01) G01R 19/03 (2006.01)

Patent

CA 1144239

RECIRCULATING RMS AC CONVERSION METHOD AND APPARATUS Abstract of the Disclosure A signal whose RMS value is to be accurately determined is first converted into DC form by a relatively inaccurate RMS converter, such as a thermal RMS converter. The result is a first converter signal (Y1), which is stored for recirculation in a suitable storage device, such as a sample and hold circuit. The first converter signal is also doubled (2Y1) and stored. Thereafter the first converter signal stored in the storage device is recirculated to the converter to create a second converter signal (Y2). Then, the second converter signal is subtracted from the doubled first converter signal (2Y1 - Y2) to produce a highly accurate RMS output signal.

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