ELECTROLYTICS_WITH_REFORMING

Published:2009/7/10 21:24:00 Author:May | From:SeekIC

Automatic tester for electrolytics applies voltage for about 15 s to repolarize dielectric before measurement is made. This provides sufficient reforming for test purposes, using 12 V through 1200 ohms, but test should be repeated if leakage current is high because of incomplete re forming. Tone from loudspeaker indicates end of 15-s reforming period. Green LED, indicates reforming process is readyto start. Red LED, indicates excessive current is flowing during reforming. LED, flashes to indicate test capacitor is being charged during measuring cycle. Article covers construction and calibration in detail. IC, is SN74123N, IC, is SN74121N, and IC, is SN7413N.-A. Drummond-Murray, Electrolytic Capacitor Tester, Wireless World, May 1977, p 47-49.



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