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http://www.edisontc.org/ui/files/2016/02/Unit1Banner900-1a.jpg800254AC power obviously poses a challenge to meter design due to its constant changing signal and other phenomena related to AC. To measure the voltage the signal is rectified(converted to DC) by vacuum tubes and can be sent to a moving-coil meter. Doyle and Chubb developed the Crest Voltmeter which was the beginning of the … Continue reading