A.C. tachometer

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A.C. tacho-generator

An a.c. generator which generates an a.c. output voltage whose amplitude and frequency are proportional to the speed. It may have either a permanent magnet or a d.c. field winding.

Reference: I.E.C. (modified)

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)