Amplitude

The maximum distance from the equilibrium position that occurs in periodic motion.

Peak amplitude
The difference between the maximum excursion and the equilibrium point.

Peak-to-peak amplitude
The difference between the maximum positive and maximum negative points of excursion.

RMS amplitude
The standard deviation of all values.

In the measurement of the vibration of an object it is common to use the following:

See also: Amplitude Stability, Instantaneous Amplitude, Peak to Peak Value, Peak Value.

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Subjects: Physics