EN IEC 61124:2023
(Main)Reliability testing - Compliance tests for constant failure rate and constant failure intensity
Reliability testing - Compliance tests for constant failure rate and constant failure intensity
This International Standard gives a number of optimized test plans, the corresponding border lines and characteristics. In addition the algorithms for designing test plans using a spreadsheet program are also given, together with guidance on how to choose test plans. This standard specifies procedures to test whether an observed value of - failure rate, - failure intensity, - mean operating time to failure (MTTF), - mean operating time between failures (MTBF), conforms to a given requirement. It is assumed, except where otherwise stated, that during the accumulated test time, the times to failure or the operating times between failures are independent and identically exponentially distributed. This assumption implies that the failure rate or failure intensity is assumed to be constant. Four types of test plans are described as follows: - truncated sequential probability ratio test (SPRT); - fixed time/failure terminated test (FTFT); - fixed calendar time terminated test without replacement; - combined test. This standard does not cover guidance on how to plan, perform, analyse and report a test. This information can be found in IEC 60300-3-5. This standard does not describe test conditions. This information can be found in IEC 60605-2 and in IEC 60300-3-5.
Prüfungen der Funktionsfähigkeit - Prüfpläne für konstante Ausfallrate und konstante Ausfalldichte
Essais de fiabilité - Plans d'essai de conformité pour un taux de défaillance constant et une intensité de défaillance constante
L'IEC 61124:2023 spécifie un certain nombre de plans d’essai optimisés, ainsi que les limites et caractéristiques correspondantes. De plus, les algorithmes pour concevoir des plans d’essai à l’aide d’une feuille de calcul sont également fournis, avec des recommandations relatives au choix de ces plans. Le présent document spécifie les procédures utilisées pour vérifier qu’une valeur observée:
d’un taux de défaillance;
d’une intensité de défaillance;
d’un temps moyen de fonctionnement avant défaillance (MTTF);
d’un temps moyen de fonctionnement entre défaillances (MTBF). est conforme à une exigence donnée. Il est présumé, sauf spécification contraire, que pendant le temps d’essai cumulé, les temps de fonctionnement avant défaillance ou les temps de fonctionnement entre défaillances sont indépendants et suivent une distribution identique et exponentielle. Cette hypothèse implique que le taux de défaillance ou l’intensité de défaillance est présumé constant.
Preskušanje zanesljivosti - Ustreznostni preskusi za konstantno pogostost odpovedi in konstantno intenzivnost odpovedi (IEC 61124:2023)
Ta mednarodni standard navaja optimizirane preskusne načrte, ustrezne meje in lastnosti. Poleg tega navaja algoritme za projektiranje preskusnih načrtov s programom s preglednicami in smernice za izbiro preskusnih načrtov.
Ta standard določa splošne postopke preskusa, ali je ugotovljena vrednost
– pogostosti odpovedi,
– intenzivnosti odpovedi,
– povprečnega časa delovanja do odpovedi (MTTF),
– povprečnega časa delovanja med odpovedmi (MTBF),
skladna z navedeno zahtevo.
Če ni navedeno drugače, se predpostavlja, da so trajanja odpovedi ali povprečna trajanja delovanja med odpovedmi med skupnim trajanjem preskusov ločena in enakomerno eksponentno razporejena. Ta predpostavka pomeni, da je pogostost odpovedi ali intenzivnost odpovedi konstantna.
Opisane so štiri vrste preskusnih načrtov:
– skrajšan sekvenčni preskus razmerja verjetnosti (SPRT);
– časovno/z odpovedjo zaključeni preskus (FTFT);
– koledarsko zaključeni preskus brez zamenjave;
– kombinirani preskus.
Ta standard ne zajema smernic za načrtovanje, izvajanje in analizo preskusa ter poročanje o njem. Te informacije so navedene v standardu IEC 60300-3-5.
Ta standard ne opisuje preskusnih pogojev. Te informacije so navedene v standardu IEC 60605-2 in standardu IEC 60300-3-5.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2023
Preskušanje zanesljivosti - Ustreznostni preskusi za konstantno pogostost
odpovedi in konstantno intenzivnost odpovedi (IEC 61124:2023)
Reliability testing - Compliance tests for constant failure rate and constant failure
intensity (IEC 61124:2023)
Prüfungen der Funktionsfähigkeit - Prüfpläne für konstante Ausfallrate und konstante
Ausfalldichte (IEC 61124:2023)
Essais de fiabilité - Plan d'essais de conformité d'un taux de défaillance constant et
d'une intensité de défaillance constante (IEC 61124:2023)
Ta slovenski standard je istoveten z: EN IEC 61124:2023
ICS:
03.120.01 Kakovost na splošno Quality in general
19.020 Preskuševalni pogoji in Test conditions and
postopki na splošno procedures in general
21.020 Značilnosti in načrtovanje Characteristics and design of
strojev, aparatov, opreme machines, apparatus,
equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 61124
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2023
ICS 03.120.30; 19.020; 21.020 Supersedes EN 61124:2012
English Version
Reliability testing - Compliance tests for constant failure rate and
constant failure intensity
(IEC 61124:2023)
Essais de fiabilité - Plans d'essai de conformité pour un Prüfungen der Funktionsfähigkeit - Prüfpläne für konstante
taux de défaillance constant et une intensité de défaillance Ausfallrate und konstante Ausfalldichte
constante (IEC 61124:2023)
(IEC 61124:2023)
This European Standard was approved by CENELEC on 2023-03-31. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61124:2023 E
European foreword
The text of document 56/1980/FDIS, future edition 4 of IEC 61124, prepared by IEC/TC 56
"Dependability" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-12-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-03-31
document have to be withdrawn
This document supersedes EN 61124:2012 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61124:2023 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 62506 NOTE Approved as EN 62506
IEC 61014 NOTE Approved as EN 61014
IEC 61710 NOTE Approved as EN 61710
IEC 61649 NOTE Approved as EN 61649
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-192 - International electrotechnical vocabulary - Part - -
192: Dependability
IEC 60300-3-5 2001 Dependability management - Part 3-5: - -
Application guide - Reliability test conditions
and statistical test principles
IEC 60605-2 - Equipment reliability testing - Part 2: Design of - -
test cycles
IEC 60605-4 2001 Equipment reliability testing - Part 4: Statistical - -
procedures for exponential distribution - Point
estimates, confidence intervals, prediction
intervals and tolerance intervals
IEC 60605-6 - Equipment reliability testing - Part 6: Tests for - -
the validity and estimation of the constant
failure rate and constant failure intensity
IEC 61123 2019 Reliability testing - Compliance test plans for EN IEC 61123 2020
success ratio
IEC 61124 ®
Edition 4.0 2023-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Reliability testing – Compliance tests for constant failure rate and constant
failure intensity
Essais de fiabilité – Plans d’essai de conformité pour un taux de défaillance
constant et une intensité de défaillance constante
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 03.120.30; 19.020; 21.020 ISBN 978-2-8322-6453-9
– 2 – IEC 61124:2023 © IEC 2023
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 10
2 Normative references . 10
3 Terms, definitions, abbreviated terms and symbols . 11
3.1 Terms and definitions . 11
3.2 Abbreviated terms and symbols . 11
3.2.1 Abbreviated terms . 11
3.2.2 Symbols . 11
4 General requirements and area of application . 13
4.1 Requirements and characteristics . 13
4.2 Applicability to replaced and repaired items . 13
4.3 Types of test plans . 14
4.3.1 General . 14
4.3.2 Advantages and disadvantages of the different test plan types . 14
5 General test procedure . 16
5.1 Test conditions . 16
5.2 General characteristics of the test plans . 17
5.3 Data to be recorded . 17
*
5.4 Calculation of accumulated test time, T . 17
5.5 Number of failures . 18
6 Truncated sequential probability ratio test (SPRT) plans . 18
6.1 General . 18
6.2 Common test procedure . 19
6.3 Decision criteria . 19
6.4 Operating characteristic (OC) curve . 20
6.5 Expected accumulated test time to decision (ETT) . 21
6.6 Overview of test plans . 22
7 Fixed time/failure terminated test plans – Fixed duration (to acceptance) test
plans . 25
7.1 General . 25
7.2 Common test procedure . 26
7.3 Decision criteria . 26
7.4 Test plans . 26
8 Design of alternative time/failure terminated test plans (FTFT) . 27
8.1 General . 27
8.2 Design procedures . 27
8.3 Common FTFT procedure . 28
8.4 Decision criteria . 28
9 Calendar time/failure terminated test plans (FTFT) for non-replaced items . 28
9.1 General . 28
9.2 Common test procedure . 29
9.3 Decision criteria . 29
9.4 Use of IEC 61123:2019, Table 5 for fixed calendar time tests . 29
9.4.1 General . 29
9.4.2 Procedure when the test time is given . 30
IEC 61124:2023 © IEC 2023 – 3 –
9.4.3 Procedure when the number of items is given . 30
10 Combined test plans . 30
10.1 General . 30
10.2 Common test procedure . 30
10.3 Decision criteria . 31
10.4 Test plans . 31
11 Performing the test and presenting the results . 32
Annex A (normative) Tables for border lines of SPRT plans (types A and C) . 33
A.1 Symbols . 33
A.2 Border lines . 33
A.3 Example of the SPRT plan from Clause 6 . 37
Annex B (normative) Tables and graphs for combined test plans (type D) . 39
B.1 General . 39
B.2 Test plans D.3 and C.3 (α = β = 10 %, D = 1,7 ) . 41
Annex C (informative) Extension of
...
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