ABSTRACT
This work is on design of a tachometer. Tachometer is device that measures the speed of rotation of a disk or shaft in motors or other machines or is a sensor device for measuring the rotation speed of an object such as the engine shaft in a car. Tachometers work on the principle that a motor which is operated as a generator produces a voltage according to the velocity of the shaft. A tachometer is also known as a RPM gauge, or rev-counter, or revolution-counter. Tachometers usually display the RPM (revolutions per minute) on an analog dial, however in recent times digital displays are becoming popular. The initial mechanical tachometers were used for measuring centrifugal force. Some of the features of tachometers include self-test diagnostics, built-in or self-calibration, timers, and counters. Control types and user interfaces include computer programmable interfaces, digital front panels or analog front panels. Available electrical outputs of tachometers include switch or alarm, analog modulated frequency, analog current and analog voltage.
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