Beat Vibration
A Beat Frequency is the result of two closely spaced frequencies going into and out of synchronisation with one another. The wideband spectrum normally will show one peak pulsating up and down. When you zoom into this peak (lower spectrum), it actually shows two closely spaced peaks. The difference in these two peaks (F2 - F1) is the beat frequency which itself appears in the wideband spectrum. The beat frequency is not commonly seen in normal frequency range measurements since it is inherently low frequency. Usually ranging from only approximately 5 to 100 CPM. Maximum vibration will result when the time waveform of one frequency (F1) comes into phase with other frequency (F2). Minimum vibration occurs when waveforms of these two frequencies line up 180° out of phase.
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