The tachometer of Nantong navigator is shaking badly. What's the problem?

The reason why the tachometer pointer wobbles up and down is the fault of the car's oxygen sensor.

Tachometer is one of the necessary instruments in machinery industry, which is used to measure the speed, linear speed or frequency of motor. It is often used in manufacturing industries such as motors, electric fans, paper making, plastics, chemical fibers, washing machines, automobiles, airplanes and ships. The most commonly used is the hand-held centrifugal tachometer. Tachometer measurement is essential in all fields of national economy.

Rotational speed is the physical quantity of the ratio of the number of revolutions of a rotating body to time, which is usually expressed as rotational speed = number of revolutions/time in engineering, and is an important parameter to describe the rotational motion of an object.

In electrician, it is often necessary to measure the rotating speed of motor and its driving equipment, and the portable tachometer is used. Tachometer is an instrument used to measure the speed and linear speed of motor. There are many kinds of tachometers, such as mechanical centrifugal tachometers and digital electronic tachometers.