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MTBF Calculation Tutorial MTBF Calculation Tutorial The parts count method is a technique for developing an estimate or prediction of the average life, the Mean Time Between Failures (MTBF), of products. It is a prediction process where by a numerical estimate is made of the ability, with respect to failure; of a design to perform its intended function.

Mean time between failures (MTBF) is the mean (average) time between failures of a system, the reciprocal of the failure rate in the special case when the failure rate is constant. Calculations of MTBF assume that a system is 'renewed', i.e. fixed, after each failure, and then returned to service immediately after failure. A related term, mean distance between failures, with a similar and more intuitive sense, is widely used in transport industries such as railways and trucking. The average time between failing and being returned to service is termed mean down time (MDT).

Example 1:
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Refference Name                       Failures
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R0001                            10000/10^6 Hours
R0002                            30000/10^6 Hours
R0003                            50000/10^6 Hours
R0004                            60000/10^6 Hours
R0005                            80000/10^6 Hours
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MTBF (Estimate)                       4.34 Hours
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Example 2:
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Refference Name                       Failures
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R0001                            0.5/10^6 Hours
R0002                            0.1/10^6 Hours
R0003                            0.2/10^6 Hours
R0004                            0.1/10^6 Hours
R0005                            0.1/10^6 Hours
----------------------------------------------------------------------
MTBF (Estimate)                       1,000,000 Hours
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• MTBF Calculator Manual: MTBF Calculator Manual
• How-To Product-Sharing: REDBACK-EYES-100S
• How-To Component-Sharing: LT8410, OPR2800, MAX803L, KEL1001L, TSL250R
• Fault Tree Graphic Analysis: Fault Tree Graphic Analysis
• Base Protocol of The Space: Base Protocol of The Space prepared by the methods of PFTA analysis
• Prediction Hand Books: MIL-HDBK-217F N1, MIL-HDBK-217F N2, NASA Risk and Reliability Analysis, Methods for the Calculation of Physical Effects, NSWC 98 / LE1