Introducing Frequency
The frequency is the number of times an event occurs in a defined period of time. In the vibration world, the “defined period of time” is either one second, or more often, one minute. Our fan is turning five times per second. The waveform therefore has five cycles per second - and that is a unit of frequency called Hertz. The frequency is therefore 5 Hz. However, if it rotates five times per second, how many times would it rotate in one minute? Well, there are 60 seconds in a minute, so it would rotate 300 times. The fan has 300 revolutions per minute, so its speed is 300 RPM, and the vibration has 300 cycles per minute - its frequency is 300 CPM.
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