tachométer

A tachometer is an instrument used to measure the rotational speed of a shaft or disk. It typically displays revolutions per minute (RPM). In vehicles, the tachometer is a gauge that shows the engine's speed. It helps drivers understand how hard the engine is working and when to shift gears.

The operation of a tachometer can vary. Mechanical tachometers use a flexible cable that connects the engine's crankshaft or camshaft to a mechanism within the gauge. This mechanism's rotation is translated into a needle movement on a dial. Electronic tachometers, more common today, use sensors to detect electrical pulses generated by the ignition system or a dedicated sensor on the engine. These pulses are then processed and displayed on a digital readout or a simulated analog needle.

In industrial settings, tachometers are crucial for monitoring the speed of machinery such as motors, turbines, and conveyor belts. This ensures optimal performance, prevents over-speeding, and aids in diagnosing potential mechanical issues. Other applications include measuring the rotational speed of turntables, fans, and even the spin rate of a centrifuge. The accuracy and type of tachometer depend on the specific application and the required precision.