Sensor mounting can significantly affect both overall vibration and FFT data. The paper shows the frequency response of various common mounting methods, such as stud, 2-rail magnet, and flat magnet measured under controlled laboratory conditions and correlates that with actual data collected on machinery in the field. It also shows the dramatic effect that mounting has on commonly used high frequency measurements such as Spike Energy and PeakVue that are used for early warning of bearing and gear faults.
13-27: How Sensor Mounting Affects Measurement
David A. Corelli, IMI Sensors