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 243
tis identical with that outlined in Fig. 91. It willalso be found that we have 1000 ohms, or the entireratio arms resistance as our fixed ratio factor. Ifnow we obtain a balance on 656 ohms and call thisResult R, then RxL 656X2.5 or 1000 + R 1000 + 656 = .99 ohm. Locating Openings in Cable… … Fig. 126. In Fig. 126 A and R are the arms of the bridge,R being made the rheostat resistance so as to geta wider range of adjustment than would be affordedby the B arm. C is a small induction coil, such asis used in telephones. B is an ordinary buzzer con- LOCATING FAULTS IN WIRES. 221 nected in…
Electric testing · Electric apparatus and appliances
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