Tachometer

A tachometer, also called rev counter is a measuring instrument that measures the speed of a shaft and displays.

Tachometer is available in various designs, such as mechanical or electrical, as built-in or hand-held device. Previously gyro were used. The different measurement principles are explained in speed measurement.

Use

In the machinery and automotive tachometer can be used to monitor the run or the speed of machinery and engines and keep it in a damage-free, economically optimal or a specially required operating range. These are to often provided with markings that indicate the area in which the operation can be harmless or heavy losses.

In four-stroke engines, the drive of the tachometer was customary by the camshaft, which runs at half the speed of the crankshaft. Early electronic tachometer that were also suitable for retrofitting, the speed determined in the alternative, to the supply line of breaking contact.

With the replacement of breaker contacts and mechanical fuel injections by transistor ignition and electronic injection systems, the electronic sensing the rotational speed of the motor based on function, realized by means of non-contact Hall-effect sensors, and also provided for tachometer available.

On vehicles many components are used with tachometer function, which - indirectly enable the speed indicator and monitoring - for example, by measuring the wheel speed and an adapted scale.

Tachometer in the center, the traditional arrangement of Porsche.

Retrofitted tachometer.

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