CEMB USA N300 - Manual (Page 67)

A rapid guide to interpreting a spectrum
C
- 3
2. TYPICAL SPECTRA OF VIBRATIONS RELATED TO THE MOST
COMMON DEFECTS
Note: The spectra are in an indicative graphic form. The N500 equipment produces a
different form of graph.
The following are the spectra of typical vibrations, caused by the most common defects
found in practical experience.
CPM = shaft rotation speed in rpm
1. UNBALANCE
2. MISALIGNMENT