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 169
e core aclick will be heard in the telephone owing to thecharge of the cable. 146 ELECTRICAL INSTRUMENTS. But if the connection be kept closed for a minuteor so the cable will be charged. Subsequent tapping will give no click if the in-sulation be good. The clicks are of course due tocurrent… … Fig. 84. nection, L a lead from the cable core to the gal-vanometer connection. K is a short circuit key,that is, one which can be left closed to short cir-cuit and cut out the galvanometer and also beopened to cut in the galvanometer. Before connecting L to the cable, test the insu-lation of L.…
Electric testing · Electric apparatus and appliances
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