What is the difference between MTBF and MTTR and how it is calculated.?

Answer 1

MTBF = Mean Time Between Failures
MTTR = Mean Time To Repair

The MTBF is the sum of all probable failure modes multiplied by the amount of time each part in an assembly is likely to last. This is data that is accumulated from input made by manufacturers, consumers, and testing departments that specialize in destructive testing. The averages are calucalted, and ... well, away we go.

The MTTR is a collection of recorded data for several different repair facilities (including the original manufacturer, usually) to repair a given fault. It includes the actual time to accomplish the repair, not the time necessary to obtain parts or the time to ship it from the site of the failure to the repair facility and back again.

Both pieces of information is only as good as the data that goes into making them ... if nobody's had the failure before (or nobody's reported having it - or fixing it), you'll have to take your best guess at a probable answer.

Answer 2

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What is the difference between MTBF and MTTR and how it is calculated.?

Answer 3

MTBF is the mean time before failure. MTTR is mean time to repair. Both are calculated from data gathered in the field or in product testing. A large number of product items are followed, and the time to failure recorded. For each failure, the time to repair it is recorded. The mean values of these times are the MTBF and MTTR.

Answer 4

Mttf Vs Mtbf