EXPANDED_RANGE_AC_VM

Published:2009/7/15 1:36:00 Author:Jessie | From:SeekIC

Line voltage is applied to D1, and resulting DC is filtered by C1 R1 delivers equivalent of RMS voltage to 100-V zener D2 through R2 Voltage is developed across R2 Only when voltage applied by R1 exceeds 100 V, for reading with 1000-ohm-per voltmeter To calibrate, rneasure AC line voltage with accurate AC Voltmeter, then adjust R1 so meter across R2 reads 100 V less than this value-W. P. Turner, Expanded Range Line Voltage Meter, 73 Magazine．March 1974, p 54.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Measuring_and_Test_Circuit/EXPANDED_RANGE_AC_VM.html

Print this Page | Comments | Reading(3)