What is a Tachometer?
A tachometer is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine.
The device usually displays the revolutions per minute on a calibrated analog dial, but digital displays are increasingly common.
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What is the difference between RPM and tachometer?
A tachometer is an instrument that measures the working speed of an engine, typically in revolutions per minute (RPM).
It is commonly used in cars, boats, planes, and other vehicles. Most tachometer gauges have either an analog (dial) or digital (LCD or LED screen) display.
What are the disadvantages of a tachometer?
Their main disadvantage lies in the fact that a mechanical link is required between the shaft and the indicator, which, in most cases, are at some distance from each other.
The flexible cables used for these instruments are rather troublesome, especially at high rotational speeds.
What are the problems on the tachometer?
The damaged reflective tape will not properly reflect the tachometer signal back to indicate full rotation.
You may be receiving an erratic tachometer signal because the damaged tape reflects irregularly. On high RPM propellers, the tape may be pulled off the propeller by aerodynamics.