Predicted elapsed time between inherent failures of a system during operation
Mean time between failures (MTBF) is the predicted elapsed time between inherent failures of a mechanical or electronic system during normal system operation. MTBF can be calculated as the arithmetic mean (average) time between failures of a system. The term is used for repairable systems while mean time to failure (MTTF) denotes the expected time to failure for a non-repairable system.[1]
The definition of MTBF depends on the definition of what is considered a failure. For complex, repairable systems, failures are considered to be those out of design conditions which place the system out of service and into a state for repair. Failures which occur that can be left or maintained in an unrepaired condition, and do not place the system out of service, are not considered failures under this definition.[2] In addition, units that are taken down for routine scheduled maintenance or inventory control are not considered within the definition of failure.[3] The higher the MTBF, the longer a system is likely to work before failing.
^J. Lienig, H. Bruemmer (2017). "Reliability Analysis". Fundamentals of Electronic Systems Design. Springer International Publishing. pp. 45–73. doi:10.1007/978-3-319-55840-0_4. ISBN 978-3-319-55839-4.
^Colombo, A.G., and Sáiz de Bustamante, Amalio: Systems reliability assessment – Proceedings of the Ispra Course held at the Escuela Tecnica Superior de Ingenieros Navales, Madrid, Spain, September 19–23, 1988 in collaboration with Universidad Politecnica de Madrid, 1988
^"Defining Failure: What Is MTTR, MTTF, and MTBF?". Stephen Foskett, Pack Rat. 6 July 2011. Retrieved 2016-01-18.
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