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 242
IN WIRES. 219 right let us call the Varley measurement R, then _ L-DR ^r — p. -. , where F is resistance to fault and D is the ratio dial reading. It will be noticed thatthis formula is very simple and quickly handled.For example, take the measurement described inFigs. 120, 121, and 122, where for… … Fig. 125. Murray Test with Leeds & Northrup Dial Bridge. Now let us throw both switches to the right andplace arm A on point M. If the student will trace 220 ELECTRICAL INSTRUMENTS. out the connections he will see that the arrangementis identical with that outlined in Fig. 91. It willalso be…
Electric testing · Electric apparatus and appliances
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