Reliability analysis

Service life – MTBF calculations

Questions of reliability and the service life of products are particularly important of the failure of a device or module is connected with significant costs or if it poses a particular safety risk. In these areas, the demands on reliability – which is described as the ability of a product or system to fulfil its designated function faultlessly over a given time period (within the framework of predefined tolerances) – are particularly high.

This reliability can be quantified by, e.g.:

  • Failure rate: the mean number of failures per time unit, e.g. as FIT value
    (FIT = Failure in time), that is the number of failures in 109 hours
  • MTTF value: “Mean Time To Failure”, i.e. the “mean operating time until failure”, or “mean service life”, according to IEC 60050 (191) the expected value of time until failure; for irreparable systems.
  • MTBF value: „Mean Time Between Failures“, i.e. the “mean operating time between two failures” or the “mean service life”, according to IEC 60050 (191) the expected value of the operating time between two consecutive failures; for reparable systems.

For electric systems, devices and modules, we offer the MTBF analysis in accordance with different international standards (EN/IEC 61709, MIL-HDBK-217, Siemens procedure SN 29500).

Ishikawa Diagram
Ishikawa Diagram
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