CAPACITANCE_TRANSDUCER_FOR_30000_RPM_IACHOMETER

Published:2009/7/16 5:57:00 Author:Jessie | From:SeekIC

R-f oscillator is adjusted to oscillator feebly anywhere between 500 and 2,000 kc. When pickup capacitance increases, it shunts oscillator feedback circuit more, reducing its r-f output voltage. Resulting drop in a-c component of rectified r-f carrier is amplified to drive tachometer or frequency meter. Pickup is mounted close to moving blades on shaft whose speed is being measured.-J. Markus and V. Zeluff, Handbook of Industrial Electronic Control Circuits, McGraw-Hill, N.Y., 1956, p 17.



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