Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 166
phiced in series witli them. The Weston alternatingcurrent voltmeter is of the dynamometer type. In this instrument themovable coil is mounted in bearings, the current being lead to andfrom the coil by watch springs as in the direct current voltmeter. Calibration of Voltmeters. The errors in a… … Fig.20. voltmeter T^to be calibrated is connected across the ends of thepotentiometer, winch should have a resistance of at least 10,000ohms. A constant battery B which must have an E. M. F. greaterthan that of the highest reading of the voltmeter is also connectedto the potentiometer terminals.…
Electrical engineering
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