1、BRITISH STANDARD BS 4778-3.2: 1991 IEC 60050(191): 1990 Incorporating Amendment No. 1 Quality vocabulary Part 3: Availability, reliability and maintainability terms Section 3.2: Glossary of international terms BS 4778-3.2:1991 This British Standard, having been prepared under the direction of the Qu
2、ality, Management and Statistics Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 31 October 1991 BSI 17 December 2002 First published as part of BS 4778-2:1979 Second edition October 1991 The following BSI references relate to the work on
3、 this standard: Committee reference QMS/23 Special announcement in BSI News August 1990 ISBN 0 580 19754 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Quality, Management and Statistics Standards Policy Committee (QMS/-) to Technical
4、 Committee QMS/23, upon which the following bodies were represented: Association for Consumer Research (ACRE) Association of Consulting Engineers British Gas plc British Railways Board British Telecommunications plc Cable and Wireless plc Civil Aviation Authority Cranfield Information Technology Ins
5、titute Cranfield Institute of Technology EEA (the Association of Electronics, Telecommunications and Business Equipment Industries) Electricity Supply Industry in United Kingdom Electronic Components Industry Federation Engineering Equipment and Materials Users Association GAMBICA (BEAMA Ltd.) Insti
6、tute of Quality Assurance Institution of Electrical Engineers Institution of Plant Engineers Ministry of Defence National Computing Centre Ltd. Railway Industry Association of Great Britain Society of British Aerospace Companies Limited United Kingdom Atomic Energy Authority Amendments issued since
7、publication Amd. No. Date Comments 13998 17 December 2002 Incorporates IEC amendment 1:1999 (see National Annex NA)BS 4778-3.2:1991 BSI 17 December 2002 i Contents Page Committees responsible Inside front cover National foreword ii List of symbols and abbreviations iii Part 1: Dependability: common
8、terms. Sections 01 to 18 191-01 Fundamental concepts 1 191-02 Item related performance 6 191-03 Defects (under consideration) 10 191-04 Failures 11 191-05 Faults, errors and mistakes 18 191-06 Item related states 25 191-07 Maintenance 29 191-08 Maintenance related times 39 191-09 Item state related
9、times 44 191-10 Reliability performance measure related times 47 191-11 Availability performance measures 50 191-12 Reliability performance measures 57 191-13 Maintainability and maintenance support performance measures 62 191-14 Test concepts 66 191-15 Design concepts 72 191-16 Analysis concepts 74
10、 191-17 Improvement processes 79 191-18 Measure modifiers 84 Part 2: Quality of service in telecommunications. Sections 19 and 20 191-19 Service related performance 89 191-20 Time concepts related to interruptions 95 Index 105 National Annex NA IEC amendment 1:1999 137BS 4778-3.2:1991 ii BSI 17 Dece
11、mber 2002 National foreword This Section of BS 4778 has been prepared under the direction of the Quality, Management and Statistics Standards Policy Committee. It is a revision and extension of some of the terms defined in BS 4778-2:1979 and contains terms and definitions for availability, reliabili
12、ty and maintainability. A revised edition of the remaining terms in BS 4778-2:1979 has been published and the 1979 edition is withdrawn. This Part of BS 4778 is issued in two Sections as follows. Section 3.1 contains definitions of terms not included in Section 3.2 which the UK considers important i
13、n this field of application, and also the concepts of many of the terms contained in Section 3.2 to which direct reference is made. This Section is identical with IEC 60050(191), “International electrotechnical vocabulary Chapter 191: Dependability and quality of service”, including amendment 1:1999
14、, published by the International Electrotechnical Commission (IEC) which contains an extensive vocabulary of availability, reliability and maintainability terms and in the preparation of which the UK has taken an active role. The text of IEC amendment 1:1999 is reproduced as National Annex NA. NOTE
15、It has been decided to reproduce as the dual-numbered British Standard, the four language versions of the definitions and the nine language translations of the terms. BS 4778 will be published in the following Parts. Part 1: International terms; Part 2: Guide to quality concepts and related definiti
16、ons; Part 3: Availability, reliability and maintainability terms. Previous editions of BS 4778 were arranged in a conceptual format which provided additional explanation and perspective for the major terms defined, as well as the formal definitions themselves. Many users found this conceptual approa
17、ch helpful and this has been retained in BS 4778-2 and in BS 4778-2.3.1. BS 4778-1 and BS 4778-1.3.2 do not include concepts. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard
18、 does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 208, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last is
19、sued.IEC 60050(191):1990 BSI 17 December 2002 iii List of symbols and abbreviations (t) (Instantaneous) failure rate. (t 1 , t 2 ) Mean failure rate. (t)( I n s t a n t a n e o u s ) r e p a i r r a t e . (t 1 , t 2 ) Mean repair rate. A Asymptotic availability. A (t) Instantaneous availability. Asy
20、mptotic mean availability. (t 1 , t 2 ) Mean availability in time interval (t 1 , t 2 ). FMEA Fault modes and effect analysis. FMECA Fault modes, effects and criticality analysis. FTA Fault tree analysis. M (t 1 , t 2 ) Maintainability. MADT Mean accumulated down time. MAD Mean administrative delay.
21、 MDT Mean down time. MLD Mean logistic delay. MMH Maintenance man-hours. MRT Mean repair time. MTBF Mean operating time between failures. MTTF Mean time to failure. MTTFF Mean time to first failure. MTTR Mean time to restoration. MUT Mean up time. R (t 1 , t 2 ) Reliability. U Asymptotic unavailabil
22、ity. U (t) Instantaneous unavailability. Asymptotic mean unavailability. (t 1 , t 2 ) Mean unavailability. z (t) (Instantaneous) failure intensity. (t 1 , t 2 ) Mean failure intensity. A A U U ziv blankIEC 60050(191):1990 BSI 17 December 2002 1IEC 60050(191):1990 2 BSI 17 December 2002IEC 60050(191)
23、:1990 BSI 17 December 2002 3IEC 60050(191):1990 4 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 5IEC 60050(191):1990 6 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 7IEC 60050(191):1990 8 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 9IEC 60050(191):1990
24、10 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 11IEC 60050(191):1990 12 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 13IEC 60050(191):1990 14 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 15IEC 60050(191):1990 16 BSI 17 December 2002IEC 60050(191):1990
25、 BSI 17 December 2002 17IEC 60050(191):1990 18 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 19IEC 60050(191):1990 20 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 21IEC 60050(191):1990 22 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 23IEC 60050(191):199
26、0 24 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 25IEC 60050(191):1990 26 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 27IEC 60050(191):1990 28 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 29IEC 60050(191):1990 30 BSI 17 December 2002IEC 60050(191):19
27、90 BSI 17 December 2002 31IEC 60050(191):1990 32 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 33IEC 60050(191):1990 34 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 35IEC 60050(191):1990 36 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 37IEC 60050(191):1
28、990 38 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 39IEC 60050(191):1990 40 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 41IEC 60050(191):1990 42 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 43IEC 60050(191):1990 44 BSI 17 December 2002IEC 60050(191):
29、1990 BSI 17 December 2002 45IEC 60050(191):1990 46 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 47IEC 60050(191):1990 48 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 49IEC 60050(191):1990 50 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 51IEC 60050(191)
30、:1990 52 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 53IEC 60050(191):1990 54 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 55IEC 60050(191):1990 56 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 57IEC 60050(191):1990 58 BSI 17 December 2002IEC 60050(191
31、):1990 BSI 17 December 2002 59IEC 60050(191):1990 60 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 61IEC 60050(191):1990 62 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 63IEC 60050(191):1990 64 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 65IEC 60050(19
32、1):1990 66 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 67IEC 60050(191):1990 68 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 69IEC 60050(191):1990 70 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 71IEC 60050(191):1990 72 BSI 17 December 2002IEC 60050(1
33、91):1990 BSI 17 December 2002 73IEC 60050(191):1990 74 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 75IEC 60050(191):1990 76 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 77IEC 60050(191):1990 78 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 79IEC 60050(
34、191):1990 80 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 81IEC 60050(191):1990 82 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 83IEC 60050(191):1990 84 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 85IEC 60050(191):1990 86 BSI 17 December 2002IEC 60050
35、(191):1990 BSI 17 December 2002 87IEC 60050(191):1990 88 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 89IEC 60050(191):1990 90 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 91IEC 60050(191):1990 92 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 93IEC 6005
36、0(191):1990 94 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 95IEC 60050(191):1990 96 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 97IEC 60050(191):1990 98 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 99IEC 60050(191):1990 100 BSI 17 December 2002IEC 60
37、050(191):1990 BSI 17 December 2002 101IEC 60050(191):1990 102 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 103IEC 60050(191):1990 104 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 105IEC 60050(191):1990 106 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 1
38、07IEC 60050(191):1990 108 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 109IEC 60050(191):1990 110 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 111IEC 60050(191):1990 112 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 113IEC 60050(191):1990 114 BSI 17 Dec
39、ember 2002IEC 60050(191):1990 BSI 17 December 2002 115IEC 60050(191):1990 116 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 117IEC 60050(191):1990 118 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 119IEC 60050(191):1990 120 BSI 17 December 2002IEC 60050(191):1990 BSI 17
40、 December 2002 121IEC 60050(191):1990 122 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 123IEC 60050(191):1990 124 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 125IEC 60050(191):1990 126 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 127IEC 60050(191):199
41、0 128 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 129IEC 60050(191):1990 130 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 131IEC 60050(191):1990 132 BSI 17 December 2002IEC 60050(191):1990 BSI 17 December 2002 133IEC 60050(191):1990 134 BSI 17 December 2002IEC 60050(
42、191):1990 BSI 17 December 2002 135136 blankBS 4778-3.2:1991 BSI 17 December 2002 137 National Annex NA IEC amendment 1:1999 This annex reproduces IEC amendment 1:1999, which lists additional terms and definitions and changes to existing terms and definitions.138 blankVI 05006ma1911.dne 9991:IEC AVAN
43、TPROPOS LeprsentamendementattabliparleGroupedeTravail1913duComitdtudes1delaCEI: Terminologie,aveclacooprationduGT 1duComitdtudesn 56delaCEI :Sretde fonctionnement. Letextedecetamendementestissudesdocumentssuivants: FDIS Rapportdevote 1/1675/FDIS 1/1687/RVD Lerapportdevoteindiqudansletableaucidessusd
44、onnetouteinformationsurlevoteayantabouti lapprobationdecetamendement. Danscechapitre191duVEIlestermesetdfinitionssontdonnsenfranaisetenanglais:deplus, lestermessontindiqusenarabe(ar),allemand(de),espagnol(es),italien(it),japonais(ja),polonais (pl),portugais(pt)etsudois(sv). _ FOREWORD Thisamendmenth
45、asbeenpreparedbyWG1913ofIECTechnicalCommittee1:Terminology,inco operationwithWG1ofIECTechnicalCommittee56:Dependability. Thetextofthisamendmentisbasedonthefollowingdocuments: FDIS Reportonvoting 1/1675/FDIS 1/1687/RVD Fullinformationonthevotingfortheapprovalofthisamendmentcanbefoundinthereportonvoti
46、ng indicatedintheabovetable. Inthischapter191oftheIEVthetermsanddefinitionsarewritteninFrenchandEnglish;inaddition thetermsaregiveninArabic(ar),German(de),Spanish(es),Italian(it),Japanese(ja),Polish(pl), Portuguese(pt)andSwedish(sv). _ BS47783.2:1991 13905006mA1911.dne 9991:CEI V INTRODUCTION Cedocu
47、mentcomprend: Uncertainnombredemodificationslapartie1 Sretdefonctionnement Termes communsduChapitre191SretdefonctionnementetqualitdeserviceduVEI.La plupartdecesmodificationsontenfaittjugesncessairesparleGT1913duCE1 lorsdelaprparationdelapartie3,etsoumisesalorsauGT1duCE56. Lapartie3Sretdefonctionnementetqualitdeservicedanslesrseauxdnergie lectriquedecechapitre.Cettepartiepeuttreutiliseseule,indpendammentdela partie1oude
