AS/NZS IEC 61703:2020
Current
The latest, up-to-date edition.
Mathematical expressions for reliability, availability, maintainability and maintenance support terms
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English
01-05-2020
Important note : Users cannot be edited or removed once added to your Multi user PDF.This Standard adopts IEC 61703:2016 which provides mathematical expressions for selected reliability, availability, maintainability and maintenance support measures defined in IEC 60050-192:2015. In addition, it introduces some terms not covered in IEC 60050-192:2015. They are related to aspects of the system of item classes (see hereafter).
| Committee |
QR-005
|
| DocumentType |
Standard
|
| ISBN |
978 1 76072 831 1
|
| Pages |
90
|
| PublisherName |
Standards Australia
|
| Status |
Current
|
| Supersedes |
his International Standard provides mathematical expressions for selected reliability, availability, maintainability and maintenance support measures defined in IEC 60050192: 2015. In addition, it introduces some terms not covered in IEC 60050-192:2015. They are related to aspects of the system of item classes (see hereafter).
According to IEC 60050-192:2015, dependability [192-01-22] is the ability of an item to perform as and when required and an item [192-01-01] can be an individual part, component, device, functional unit, equipment, subsystem, or system.
To account for mathematical constraints, this standard splits the items between the individual items considered as a whole (e.g. individual components) and the systems made of several individual items. It provides general considerations for the mathematical expressions for systems as well as individual items but the individual items which are easier to model are analysed in more detail with regards to their repair aspects.
The following item classes are considered separately:
- Systems;
- Individual items:
– non-repairable [192-01-12];
– repairable [192-01-11]:
i) with zero (or negligible) time to restoration;
ii) with non-zero time to restoration.
In order to explain the dependability concepts which can be difficult to understand, keep the standard self-contained and the mathematical formulae as simple as possible, the following basic mathematical models are used in this standard to quantify dependability measures:
- Systems:
– state-transition models;
– Markovian models.
- Individual items:
– random variable (time to failure) for non-repairable items;
– simple (ordinary) renewal process for repairable items with zero time to restoration;
– simple (ordinary) alternating renewal process for repairable items with non-zero time to restoration.
The application of each dependability measure is illustrated by means of simple examples.
This standard is mainly applicable to hardware dependability, but many terms and their definitions may be applied to items containing software.
| Standards | Relationship |
| IEC 61703:2016 | Identical |
First published as AS/NZS IEC 61703:2020.
| ISO 3534-1:2006 | Statistics — Vocabulary and symbols — Part 1: General statistical terms and terms used in probability |
| IEC 61508-4:2010 | Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 4: Definitions and abbreviations (see Functional Safety and IEC 61508) |
| IEC 61508-5:2010 | Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 5: Examples of methods for the determination of safety integrity levels (see Functional Safety and IEC 61508) |
| IEC 61508-6:2010 | Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 6: Guidelines on the application of IEC 61508-2 and IEC 61508-3 (see Functional Safety and IEC 61508) |
| IEC 61025:2006 | Fault tree analysis (FTA) |
| IEC 60605-6:2007 | Equipment reliability testing - Part 6: Tests for the validity and estimation of the constant failure rate and constant failure intensity |
| IEC 60605-4:2001 | Equipment reliability testing - Part 4: Statistical procedures for exponential distribution - Point estimates, confidence intervals, prediction intervals and tolerance intervals |
| IEC 61511-2:2016 | Functional safety - Safety instrumented systems for the process industry sector - Part 2: Guidelines for the application of IEC 61511-1:2016 |
| IEC 61078:2016 | Reliability block diagrams |
| IEC 61508-1:2010 | Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements (see Functional Safety and IEC 61508) |
| IEC 60605-2:1994 | Equipment reliability testing - Part 2: Design of test cycles |
| IEC 61165:2006 | Application of Markov techniques |
| IEC 61508-7:2010 | Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 7: Overview of techniques and measures (see Functional Safety and IEC 61508) |
| IEC 61511-3:2016 | Functional safety - Safety instrumented systems for the process industry sector - Part 3: Guidance for the determination of the required safety integrity levels |
| IEC 61511-1:2016+AMD1:2017 CSV | Functional safety - Safety instrumented systems for the process industry sector - Part 1: Framework, definitions, system, hardware and application programming requirements |
| IEC 61508-2:2010 | Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems (see Functional Safety and IEC 61508) |
| IEC 61508-3:2010 | Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 3: Software requirements (see Functional Safety and IEC 61508) |
| IEC 60050-192:2015 | International Electrotechnical Vocabulary (IEV) - Part 192: Dependability |
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