The vibration monitoring industry has specialized jargon that is commonly used when talking about vibration sensors, accelerometers and associated applications. It's important that you understand common terminology to communicate effectively with vibration monitoring, reliability, condition monitoring and process automation professionals. We hope you find our glossary useful to find specialized terms and definitions used across vibration, condition monitoring and predictive maintenance.



A physical property, dynamically computed as acceleration/force. Statically computed as W (which can be measured on a scale)/g. Ordinary structures are not pure masses as they contain reactive elements, i.e., springs and damping.


The physical quantity, property, or condition which is measured. (e.g.: pressure, load, weight, acceleration).


At a point in a mechanical system, the complex ratio of force to velocity during simple harmonic motion. Usually expressed as: F/v where all terms are phasors, having a magnitude and direction. Mechanical impedance is the reciprocal of Mobility.


The fluid(s) in contact with the diaphragm, the pressure of which is being measured.


The resonance frequency of an accelerometer rigidly mounted directly to the vibration generator with a solid stud, or adhesive mounted as specified by the manufacturer.