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Mean time to repair (MTTR) is a basic measure of the maintainability of repairable items. It represents the average time required to repair a failed component or device. [1] Expressed mathematically, it is the total corrective maintenance time for failures divided by the total number of corrective maintenance actions for failures during a given ...
Mean time between failures (MTBF) is the predicted elapsed time between inherent failures of a mechanical or electronic system during normal system operation. MTBF can be calculated as the arithmetic mean (average) time between failures of a system. The term is used for repairable systems while mean time to failure (MTTF) denotes the expected ...
Mean time to recovery. Mean time to recovery (MTTR) [1][2][3] is the average time that a device will take to recover from any failure. Examples of such devices range from self-resetting fuses (where the MTTR would be very short, probably seconds), to whole systems which have to be repaired or replaced. The MTTR would usually be part of a ...
Availability is the probability that an item will be in an operable and committable state at the start of a mission when the mission is called for at a random time, and is generally defined as uptime divided by total time (uptime plus downtime).
MTTFd. Mean Time to Dangerous Failure. In a safety system MTTF D is the portion of failure modes that can lead to failures that may result in hazards to personnel, environment or equipment. MTTF D is critical to the determination of the performance level of a safety system. ISO 13849 defines three levels of MTTF D: Level achieved by channel.
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SAIDI. The System Average Interruption Duration Index (SAIDI) [ 1 ] is commonly used as a reliability index by electric power utilities. SAIDI is the average cumulative outage duration for each customer served, and is calculated as: where is the number of customers and is the annual outage time for location , and is the total number of ...
Medical calculator. A medical calculator is a type of medical computer software, whose purpose is to allow easy calculation of various scores and indices, presenting the user with a friendly interface that hides the complexity of the formulas. Most offer further helpful information such as result interpretation guides and medical literature ...