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Telcordia sr 332 issue 46/11/2023 If the failure rate is known, then MTBF is equal to 1 / failure rate. Not only are there more complicated mathematical scenarios, but there is also the issue of feasibility in setting up complex and costly test beds.Īnother way to compute MTBF is using the failure rate value of a system in its “useful life” period, or the part of product lifecycle where the failure rate of the system is constant. How do I account for units that do not fail? What if I want to consider repair times or designs that incorporate redundancy? These factors will have significant impact on the MTBF value. Also, there are more complexities to consider. Even in this case, you can see that the more systems I test, and the more data I have, the more accurate my MTBF value will be. This is a very simple example of calculating MTBF. This indicates that on average my system will fail every 448 hours of operation – not that it will fail precisely at 448 hours. If my sample results are failures at the following times: 100 hours, 230 hours, 400 hours, 510 hours, and 1000 hours, my MTBF is (100 + 230 + 400 + 510 + 1000) / 5, or 448 hours. For example, I set up a test case with 5 systems I turn them all on at the same time, and then record the times of failure. MTBF is then computed as the average of the failure times. ![]() One method of computing MTBF (or MTTF for non-repairable systems), is to track operating systems and record the times to failure.
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