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IEC 61703

Mathematical Expressions for Reliability, Availability, Maintainability and Maintenance Support Terms

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Organization: IEC
Publication Date: 1 September 2001
Status: inactive
Page Count: 112
ICS Code (Characteristics and design of machines, apparatus, equipment): 21.020
ICS Code (Application of statistical methods): 03.120.30
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.

Document History

August 1, 2016
Mathematical Expressions for Reliability, Availability, Maintainability and Maintenance Support Terms
This International Standard provides mathematical expressions for selected reliability, availability, maintainability and maintenance support measures defined in IEC 60050192: 2015. In addition, it...
IEC 61703
September 1, 2001
Mathematical Expressions for Reliability, Availability, Maintainability and Maintenance Support Terms
This International Standard provides mathematical expressions for reliability, availability, maintainability and maintenance support measures defined in IEC 60050-191. The following classes of items...

References

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