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
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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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