Single-shaft machineIdentifying the First Order (1X) Peak
The first step in machine vibration analysis is to identify the spectral peak corresponding to shaft rotation rate, or the so-called 1X peak. This will be the 1X in a normalized spectrum. It is important to check to be sure the normalization was done correctly. It is also called the first order peak. In multiple-shaft machines, each shaft will have a characteristic 1X peak, and these are then located by the analyst.
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