GSO IEC 61703:2014

IEC 61703:2001
Gulf Standard   Current Edition · Approved on 25 December 2014

Mathematical expressions for reliability, availability, maintainability and maintenance support terms

GSO IEC 61703:2014 Files

English 103 Pages
Current Edition Reference Language

GSO IEC 61703:2014 Scope

This International Standard provides mathematical expressions for reliability, availability, maintainability and maintenance support measures defined in IEC 60050-191. The following classes of items are considered separately in this standard: – non-repaired items; – repaired items with zero time to restoration; – repaired items with non-zero time to restoration. In order to keep the mathematical formulae as simple as possible, the following basic mathematical models are used to quantify dependability measures: – random variable (time to failure) for non-repaired items; – simple (ordinary) renewal process for repaired items with zero time to restoration; – simple (ordinary) alternating renewal process for repaired items with non-zero time to restoration. To facilitate location of the full definition, the IEC 60050-191 reference for each term is shown (in parenthesis) immediately following each term, for example: mean time to restoration [191-13-08] The application of each dependability measure is illustrated by means of a simple example. NOTE This standard is mainly applicable to hardware dependability, but many terms and their definitions may be applied to items containing software. Some of the software dependability aspects are explained in annex D.

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