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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 188

An illustration from Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets, 1907, leaf 188
he voltmeter may be calcu-lated as above, or a formula may be used for theentire calculation. TESTING WITH VOLTMETER. 165 Formula. In the formula let V be the first de-flection, V1 the second deflection, and r be the re-sistance of the voltmeter, Then V xr ~v7 —r = x or the resistance of R. For… … Fig. 94. Insulation of Generator with Voltmeter. In test-ing the insulation of a generator in operation, con-nection is made as in Fig. 94 where V is the volt-meter, 5 the shaft or part of the framework, andB B the brushes. The generator furnishes its own testing current.The e.m.f. across B B is…

Electric testing · Electric apparatus and appliances

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