Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 240
s are right, thusproving that any poorinsulation will be indi-cated, if it exists. Voltmeter Method.The voltmeter test forinsulation resistance re-quires a sensitive high-resistance voltmeter.Take, for example, the150-volt instrument, Fig.77, which usually has about a 1-5,000-ohm resistance. (A… … Fig. 77. Typical DArsonval VoltmeterCourtesy of General Electric Company 213 92 MANAGEMENT OF DYNAMO-ELECTRIC MACHINEEY the machine is then connected into the circuit, as indicated inFig. 78. The deflection of the voltmeter is less than before, inproportion to the value of the insulation…
Electrical engineering
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