The output of rms-to-dc converters, such as Analog Devices models 440 and 441, consists of a dc level and an undesired ac "ripple" voltage. The ripple amplitude is inversely proportional to the product of the input-signal frequency and the filter time constant. Read full article
Measure RMS with Less Ripple in Less Time
Follow an RMS Converter with a Two-Pole Filter; Design Guides SImplify Component Choice
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