The German DIN Standard 31 051 defines maintenance as allmeasures for retention and re-creation of the specification con-dition as well as for determining and evaluating the actual con-dition of technical aspects of a system. In addition, conscientious maintenance practiceshelp avoid unplanned machine stoppage and the resulting pro-duction downtime while improving production quality andplant safety. Maintenance plays an increasingly important economic role inmodern industry, as managers realize that the key to retaininglong-term investment capital value lies in regular service andinspection. Vibration HandbookFundamentals Transducers Measurement methods
