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 68
VOLTMETERS AND AMMETERS. 45 The pointer is then more readily located as to itsproximity to this disc when viewed from a distance. Sensibility. In the Weston direct current in-struments of the portable or the Type B form, aresistance of about 100 ohms per volt is added. In the other types of… … Fig. 33. In case the exact resistance is not marked, itcan be obtained from the makers by quoting theserial number of the particular voltmeter. As the figures are needed in testing work, theyshould always be recorded. The sensibility of a Weston instrument type B orof the portable form is about…
Electric testing · Electric apparatus and appliances
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