What is a tachometer?

A tachometer is an instrument that measures the rotation rate of a shaft or disk, most commonly in a engine or motor. It is typically used to measure the revolutions per minute (RPM) of the rotating object.

• Purpose: The primary purpose of a tachometer is to display the rotational speed of a machine. This information is crucial for monitoring engine performance, ensuring safe operating conditions, and diagnosing mechanical issues.

• Types: There are different types of tachometers, including:

  • Analog Tachometers: These use a needle and dial to display the RPM. They often work via a mechanical or electrical connection to the rotating shaft. Learn more about "Analog%20Tachometers".
  • Digital Tachometers: These use a digital display to show the RPM, often providing more precise and easily readable measurements. They can be contact or non-contact. Explore "Digital%20Tachometers".
    • Contact Tachometers: Require physical contact with the rotating shaft, usually through a rubber-tipped wheel.
    • Non-Contact Tachometers (Photo Tachometers): Use a beam of light (often a laser) that is reflected off a reflective mark on the rotating object. Learn about "Photo%20Tachometers".

• Applications: Tachometers are used in a wide range of applications, including:

  • Automotive: Monitoring engine RPM in cars, trucks, and motorcycles.
  • Industrial Machinery: Measuring the speed of motors, pumps, and other rotating equipment.
  • Aviation: Indicating engine RPM in aircraft.
  • Medical: Some medical devices use tachometers to monitor rotational speed.

• Working Principle: The working principle varies depending on the type of tachometer. Analog tachometers might use a centrifugal force or voltage generated by a rotating magnet. Digital tachometers often use sensors to detect the passing of a marked point on the rotating object.

• Units of Measurement: The most common unit of measurement for tachometers is Revolutions per Minute (RPM). "Revolutions%20per%20Minute". Some may also display revolutions per second (RPS).