MTTF and MTBF – KBA210997

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Question: What are MTTF and MTBF?



MTTF (Mean Time to Failure) - describes the expected time to failure for a non-repairable system.


MTBF (Mean Time Between Failure) – The average time excludes the time spent waiting for repair, being repaired, being re-qualified, and other downing events such as inspections and preventive maintenance and so on; it is intended to measure only the time a system is available and operating.