direct-current tachometer
direct-current tachometer
[də¦rekt ¦kə·rənt tə′käm·əd·ər] (electricity)
A dc generator operating with negligible load current and with constant field flux provided by a permanent magnet, so its dc output voltage is proportional to speed.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.