This revision of ISO 2041:1990 reflects advances in technology and refinements in terms used in the original vocabulary standard. As such, it incorporates more precise definitions of some terms reflecting changes in accepted meaning. New terms which were driven by changes in technology (primarily in the areas of signal processing, condition monitoring and vibration and shock diagnostics and prognostics).
ANSI/ASA S2.1-2009 history
2009ANSI/ASA S2.1-2009 Mechanical vibration, shock and condition monitoring - Vocabulary