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EN 61703:2002

(Main)

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

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

Provides mathematical expressions for reliability, availability, maintainability and maintenance support measures. - Non-repaired items and - repaired items with zero and non-zero time to restoration are considered separately in this standard.

Mathematische Ausdrücke für Begriffe der Funktionsfähigkeit, Verfügbarkeit, Instandhaltbarkeit und Instandhaltungsbereitschaft

Expressions mathématiques pour les termes de fiabilité, de disponibilité, de maintenabilité et de logistique de maintenance

Fournit des expressions mathématiques pour les caractéristiques liées à la fiabilité, à la disponibilité, à la maintenabilité et à la logistique de maintenance. - Les entités non réparées et - les entités réparées à temps de panne nul et non nul sont traitées séparément dans la présente norme.

Mathematical expressions for reliability, availability, maintainability and maintenance support terms (IEC 61703:2001)

General Information

Status
Withdrawn
Publication Date
08-Jan-2002
Withdrawal Date
30-Nov-2004
ICS
03.120.30 - Application of statistical methods
21.020 - Characteristics and design of machines, apparatus, equipment
Technical Committee
CLC/SR 56 - Dependability
Drafting Committee
IEC/TC 56 - IEC_TC_56
Parallel Committee
IEC/TC 56 - IEC_TC_56
Current Stage
9960 - Withdrawal effective - Withdrawal
Start Date
16-Sep-2019
Completion Date
16-Sep-2019
Ref Project
SIST EN 61703:2002 - Mathematical expressions for reliability, availability, maintainability and maintenance support terms

Relations

Replaced By
EN 61703:2016 - Mathematical expressions for reliability, availability, maintainability and maintenance support terms
Effective Date
22-Nov-2016

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SLOVENSKI STANDARD
01-september-2002
Mathematical expressions for reliability, availability, maintainability and
maintenance support terms (IEC 61703:2001)
Mathematical expressions for reliability, availability, maintainability and maintenance
support terms
Mathematische Ausdrücke für Begriffe der Funktionsfähigkeit, Verfügbarkeit,
Instandhaltbarkeit und Instandhaltungsbereitschaft
Expressions mathématiques pour les termes de fiabilité, de disponibilité, de
maintenabilité et de logistique de maintenance
Ta slovenski standard je istoveten z: EN 61703:2002
ICS:
01.040.07 Matematika. Naravoslovne Mathematics. Natural
vede (Slovarji) sciences (Vocabularies)
07.020 Matematika Mathematics
21.020 =QDþLOQRVWLLQQDþUWRYDQMH Characteristics and design of
VWURMHYDSDUDWRYRSUHPH machines, apparatus,
equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61703
NORME EUROPÉENNE
EUROPÄISCHE NORM January 2002
ICS 03.120.30;21.020
English version
Mathematical expressions for reliability, availability,
maintainability and maintenance support terms
(IEC 61703:2001)
Expressions mathématiques pour Mathematische Ausdrücke für Begriffe
les termes de fiabilité, de disponibilité, der Funktionsfähigkeit, Instandhaltbarkeit
de maintenabilité et de logistique und Verfügbarkeit
de maintenance (IEC 61703:2001)
(CEI 61703:2001)
This European Standard was approved by CENELEC on 2001-12-04. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61703:2002 E
Foreword
The text of document 56/747/FDIS, future edition 1 of IEC 61703, prepared by IEC TC 56,
Dependability, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 61703 on 2001-12-04.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2002-09-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-12-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annexes A, B, C and D are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61703:2001 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 61703:2002
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60050-191 1990 International Electrotechnical --
Vocabulary (IEV)
Chapter 191: Dependability and quality
of service
ISO 3534-1 1993 Statistics - Vocabulary and symbols--
Part 1: Probability and general statistical
terms
NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Première édition
STANDARD
First edition
2001-09
Expressions mathématiques pour les termes
de fiabilité, de disponibilité, de maintenabilité
et de logistique de maintenance
Mathematical expressions for reliability,
availability, maintainability and
maintenance support terms
 IEC 2001 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission in
microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
XA
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

61703 © IEC:2001 – 3 –
CONTENTS
FOREWORD . 7
INTRODUCTION .9
1 Scope . 11
2 Normative references. 11
3 Definitions. 13
4 Glossary of symbols and abbreviations . 15
4.1 Non-repaired items . 15
4.2 Repaired items with zero time to restoration . 17
4.3 Repaired items with non-zero time to restoration . 19
5 Assumptions . 25
5.1 General remarks . 25
5.2 Assumptions for non-repaired items. 25
5.3 Assumptions for repaired items. 27
6 Mathematical expressions. 33
6.1 Non-repaired items . 33
6.1.1 Presentation . 33
6.1.2 Reliability [191-12-01] . 33
6.1.3 Instantaneous failure rate [191-12-02]. 35
6.1.4 Mean failure rate [191-12-03] . 37
6.1.5 Mean time to failure [191-12-07] . 39
6.2 Repaired items with zero time to restoration . 41
6.2.1 Presentation . 41
6.2.2 Reliability [191-12-01] . 41
6.2.3 Instantaneous failure intensity [191-12-04]. 43
6.2.4 Mean failure intensity [191-12-05] . 45
6.2.5 Mean time to failure [191-12-07] . 47
6.2.6 Mean time between failures [191-12-08]. 47
6.2.7 Mean operating time between failures [191-12-09] . 49
6.2.8 Mean up time [191-11-11] . 49
6.3 Repaired items with non-zero time to restoration . 49
6.3.1 Presentation . 49
6.3.2 Reliability [191-12-01] . 51
6.3.3 Instantaneous failure intensity [191-12-04]. 53
6.3.4 Mean failure intensity [191-12-05] . 59
6.3.5 Mean time to failure [191-12-07] . 61
6.3.6 Mean time between failures [191-12-08]. 63
6.3.7 Mean operating time between failures [191-12-09] . 63
6.3.8 Instantaneous availability [191-11-01] . 65
6.3.9 Instantaneous unavailability [191-11-02] . 67

61703 © IEC:2001 – 5 –
6.3.10 Mean availability [191-11-03] . 69
6.3.11 Mean unavailability [191-11-04] . 71
6.3.12 Asymptotic availability [191-11-05]. 73
6.3.13 Asymptotic unavailability [191-11-07] . 75
6.3.14 Mean up time [191-11-11] . 75
6.3.15 Mean down time [191-11-12]. 77
6.3.16 Maintainability [191-13-01] . 79
6.3.17 Mean repair rate [191-13-03]. 81
6.3.18 Mean repair time [191-13-05] . 83
6.3.19 Mean active corrective maintenance time [191-13-07] . 85
6.3.20 Mean time to restoration [191-13-08]. 87
6.3.21 Mean administrative delay [191-13-11]. 89
6.3.22 Mean logistic delay [191-13-13]. 89
Annex A (informative) Performance aspects and descriptors . 93
Annex B (informative) Summary of measures related to time to failure . 95
Annex C (informative) Comparison of some dependability measures for
continuously operating items . 99
Annex D (informative) Software dependability aspects . 101
Bibliography . 103
Figure 1 – Sample realization of a non-repaired item. 27
Figure 2 – Sample realization of a repaired item with zero time to restoration. 29
Figure 3 – Sample realization of a repaired item with non-zero time to restoration. 31
Figure 4 – Comparison of an up time for a COI and an IOI . 33
Figure A.1 – Performance aspects and descriptors. 93
Table B.1 – Relations among functional measures of time to failure of continuously
operating items . 95
Table B.2 – Summary of measures for some probability distributions of time to failure
of continuously operating items . 97
Table C.1 – Comparison of some dependability measures of continuously operating
items with constant failure rate λ and restoration rate μ . 99
R
61703 © IEC:2001 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MATHEMATICAL EXPRESSIONS FOR RELIABILITY,
AVAILABILITY, MAINTAINABILITY AND
MAINTENANCE SUPPORT TERMS
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical commit
...

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