Article
Article
Tachometer
Article By:
Wolferz, Alfred H. Formerly, Tachometer Systems Development Group, Weston Instruments Division, Daystrom Inc., Newark, New Jersey.
Last reviewed:June 2020
DOI:https://doi.org/10.1036/1097-8542.676300
An instrument that measures angular speed, as that of a rotating shaft. The measurement may be in revolutions over an independently measured time interval, as in a revolution counter, or it may be directly in revolutions per minute. The instrument may also indicate the average speed over a time interval or the instantaneous speed. Tachometers are used for direct measurement of angular speed and as elements of control systems to furnish a signal as a function of angular speed.
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