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Definition of "Tachometer" |
An instrument for measuring speed (rpm) of a rotating shaft. / A small ac or dc generator, sometimes referred to as a rate generator, that converts its shaft speed into an electrical output. The tachometer is frequently used in servo-systems to sense the velocity of a load. An instrument that measures the rate at which a shaft is turning [angular velocity]. / A device used to indicate the speed of the engine in rpm. The tachometer is mounted on or near the dashboard (some even appear on the hood and others in a heads-up display on the windshield ). It helps the driver to know the optimum rpm for changing gears on manual transmissions. A tachometer is also a diagnostic device which a mechanic uses to determine idle speed and other carburetor and running settings. / a instrument used to measure the speed of a rotating device. Several types of tachometers are available. Friction devices are placed against the shaft of the device being measured. Others used magnetic variation or reflected light pulses to determine the speed. Tachometer generators are mounted on the shaft of the device being measured and provide a voltage proportional to the speed. Tach generators are often used in servo systems. |
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