INDUCTANCE_METER

Published:2009/7/11 3:43:00 Author:May | From:SeekIC

When used with variable-frequency audio oscillator, FET circuit checks any inductance between 60 μH and 60,000 H by resonance method. With unknown coil connected to terminals XX, external oscillator is tuned for peak deflection of M1. Inductance is then calculated from L=1/(395x10-9 f2) where L is in henrys and f is in hertz. if desired, calibration graph can be prepared to eliminate calculations. High input impedance of FET minimizes oscillatorloading. Ad just R1 forfull-scale deflection of meter at resonance, to give maximum sensitivity.-R. P. Turner, FET Circuits, Howard W. Sams, Indianapolis, IN, 1977, 2nd Ed., p 138-140.



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