STANDBY_GENERATOR_FREQUENCY_METER

Published:2009/7/1 4:19:00 Author:May | From:SeekIC

Developed for use with 10-60 VAC generator driven by Iawn mower engine， as guide for adjusting speed manually to give correct power-line frequency. Output of altemator， connected to A and B，is converted to regulated 10VDC by R1， D1， D2， and C2. Same input voltage is squared by Tr1 and fed to Tr 2through differentiating circuit. Current pulses developed in collector circuit of Tr2 have constant width and varying repetition rate depending on input frequency. Inertia of meter movement provides integration required to give steady reading that changes only with input frequency. Meter scale is calibrated from 0 to 100 Hz，with R6 adjusted to give correct reading when 10-60 VAC Iine voltage is applied to input. Power transformer must be used to boost output of alternator to correct AC Iine voltage.-J. M. Caunter，Low-Cost Emergency Power Generator, Wlireless World， Feb. 1975，p 75-77.



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