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MTBF is a basic measure of an asset's reliability. It is calculated by dividing the total operating time of the asset by the number of failures over a given period of time. Taking the example of the AHU above, the calculation to determine MTBF is: 3,600 hours divided by 12 failures. The result is 300 operating hours.
Calculating MTBF To calculate the MTBF, you divide the number of hours by the number of failures. In the case of the five light bulbs that were tested, which had a failure rate of 4 per 3,647, you determine the MTF as 3,647/4 = 909. The MTBF is therefore 909 hours.
If the MTBF is known, one can calculate the failure rate as the inverse of the MTBF. The formula for failure rate is: failure rate= 1/MTBF = R/T where R is the number of failures and T is total time. This tells us that the probability that any one particular device will survive to its calculated MTBF is only 36.8%.
To calculate the failure rate, divide the number of failures by the total number of hours, such as 4/3,647 = 0.0011 failures per hour. In this example, the failure rate per hour is so small that it is almost insignificant.
To calculate the MTBF, you divide the number of hours by the number of failures. In the case of the five light bulbs that were tested, which had a failure rate of 4 per 3,647, you determine the MTF as 3,647/4 = 909. The MTBF is therefore 909 hours.
Although useful to some degree, the mean life function (often denoted as "MTTF" or "MTBF") is not a good measurement when used as the sole reliability metric.
Mean time between failures (MTBF) is the predicted elapsed time between inherent failures of a mechanical or electronic system, during normal system operation. In addition, units that are taken down for routine scheduled maintenance or inventory control are not considered within the definition of failure.
MTBF, or Mean Time Between Failures, is a metric that concerns the average time elapsed between a failure and the next time it occurs. These lapses of time can be calculated by using a formula. Whereas the MTTR, or Mean Time To Repair, is the time it takes to run a repair after the occurrence of the failure.
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