Mean time between failures

(MTBF, or “Mean Time Between Faults”) The average time (usually expressed in hours) that a component works without failure. It is calculated by dividing the total number of failures into the total number of operating hours observed. The term can also mean the length of time a user may reasonably expect a device or system to work before an incapacitating fault occurs.
See also Mean Time To Recovery.


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  • Mean time between faults

    Mean Time Between Failures

  • Mean time to recovery

    specification (MTTR) The average time that a device will take to recover from a non-terminal failure. Examples of such devices range from self-resetting fuses (where the MTTR would be very short, probably seconds), up to whole systems which have to be replaced. The MTTR would usually be part of a maintenance contract, where the user […]

  • Mean to

    Intend to, as in I meant to go running this morning but got up too late, or I’m sorry I broke it—I didn’t mean to. This idiom was first recorded in 1560.

  • Meantone-system

    [meen-tohn] /ˈminˌtoʊn/ noun, Music. 1. a system for tuning keyboard instruments, used before the development of tuning by equal temperament and considered practical only for tonalities of not more than two sharps or flats.

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