Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets (1907)
Schneider, Norman H. (Norman Hugh), Hargrave, Jesse · New York, Spon & Chamberlain; [etc., etc.] · leaf 110
Fig. GO. cut in circuit to equal what the resistance beingmeasured amounts to. (When no idea is had ofthe latter, the galvanometer key must be tappedcarefully that no undue deflection injures gal-vanometer) . Depress battery key and tap galvanometer key. PORTABLE TESTING SETS. 87 If needle swings… … Fig. 61. By varying the proportions in the bridge arms,higher or lower resistances than those included in 88 ELECTRICAL INSTRUMENTS. the rheostat can be measured. The latter runsfrom 1 ohm to a total of 21,110 ohms. The working range of this set is from .001 ohmto about 500,000 ohms with the…
Electric testing · Electric apparatus and appliances
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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