EN 62506:2013
(Main)Methods for product accelerated testing
Methods for product accelerated testing
IEC 62506:2013 provides guidance on the application of various accelerated test techniques for measurement or improvement of product reliability. Identification of potential failure modes that could be experienced in the use of a product/item and their mitigation is instrumental to ensure dependability of an item. The object of the methods is to either identify potential design weakness or provide information on item dependability, or to achieve necessary reliability/availability improvement, all within a compressed or accelerated period of time. This standard addresses accelerated testing of non-repairable and repairable systems. It can be used for probability ratio sequential tests, fixed duration tests and reliability improvement/growth tests, where the measure of reliability may differ from the standard probability of failure occurrence. This standard also extends to present accelerated testing or production screening methods that would identify weakness introduced into the product by manufacturing error, which could compromise product dependability. Keywords: test techniques for measurement or improvement of product reliability
Verfahren für beschleunigte Produktprüfungen
Méthodes d'essais accélérés de produits
La CEI 62506:2013 fournit des recommandations pour l'application de diverses techniques d'essais accélérés permettant de mesurer ou d'améliorer la fiabilité des produits. L'identification des modes de défaillance potentiels qui pourraient être rencontrés lors de l'utilisation d'un produit/entité donné(e) et la manière d'y remédier contribuent à assurer la sûreté de fonctionnement d'une entité. L'objectif est soit d'identifier les faiblesses potentielles de la conception et fournir des informations sur la sûreté de fonctionnement de l'entité, soit d'atteindre l'amélioration nécessaire de la fiabilité/disponibilité, dans les deux cas en comprimant ou en accélérant la période d'essai requise. La présente norme couvre les essais accélérés de systèmes non réparables et réparables. Elle peut être utilisée pour des essais progressifs à taux de probabilité, des essais à durée fixe et des essais d'amélioration/croissance de la fiabilité, lorsque la mesure de la fiabilité peut être différente de la probabilité normalisée d'occurrence de défaillance. La présente norme décrit également des méthodes d'essais accélérés ou de déverminage de la production qui permettraient d'identifier les faiblesses induites par une éventuelle erreur de fabrication du produit et qui risqueraient de ce fait d'en compromettre la sûreté de fonctionnement. Mots clés: techniques d'essais permettant de mesurer ou d'améliorer la fiabilité des produits
Metode za pospešeno preskušanje proizvodov (IEC 62506:2013)
Ta mednarodni standard ponuja napotke za uporabo različnih metod za pospešeno preskušanje za ugotavljanje ali izboljšanje zanesljivosti izdelka. Določitev potencialnih zvrsti napak, do katerih lahko pride med uporabo izdelka/dela, in ublažitev le-teh je bistvenega pomena pri zagotavljanju zanesljivosti dela. Cilj metode je določitev morebitnih zasnovnih slabosti, zagotavljanje podatkov o zanesljivosti dela ali izvajanje potrebnih izboljšav zanesljivosti/razpoložljivosti – vse to v strnjenem oz. pospešenem časovnem obdobju. Ta standard obravnava pospešeno preskušanje nepopravljivih in popravljivih sistemov. Uporablja se lahko za sekvenčne preskuse razmerja verjetnosti, preskuse s fiksnim trajanjem in preskuse izboljšanja/povečanja zanesljivosti, pri čemer se lahko stopnja zanesljivosti razlikuje od standardne verjetnosti pojava napake. Ta standard prav tako obravnava trenutno pospešeno preskušanje ali metode za pregled proizvodnje, ki določijo slabosti izdelka, ki so posledica proizvodne napake in ki bi lahko ogrozile zanesljivost izdelka.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Metode za pospešeno preskušanje proizvodov (IEC 62506:2013)Méthodes d'essais accélérés de produitsMethods for product accelerated testing21.020Characteristics and design of machines, apparatus, equipment19.020Preskuševalni pogoji in postopki na splošnoTest conditions and procedures in general03.120.01Kakovost na splošnoQuality in generalICS:Ta slovenski standard je istoveten z:EN 62506:2013SIST EN 62506:2014en01-maj-2014SIST EN 62506:2014SLOVENSKI
STANDARD
EUROPEAN STANDARD EN 62506 NORME EUROPÉENNE
EUROPÄISCHE NORM August 2013
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2013 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62506:2013 E
ICS 03.120.01; 21.020
English version
Methods for product accelerated testing (IEC 62506:2013)
Méthodes d'essais accélérés de produits (CEI 62506:2013)
Verfahren für beschleunigte Produktprüfungen (IEC 62506:2013)
This European Standard was approved by CENELEC on 2013-06-21. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Foreword The text of document 56/1503/FDIS, future edition 1 of IEC 62506, prepared by IEC/TC 56 "Dependability" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62506:2013.
The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2014-03-21 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-06-21
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62506:2013 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 standards indicated: IEC 60812 NOTE
Harmonized as EN 60812:2006 IEC 61125:1992 NOTE
Harmonized as EN 61125:1993 (not modified).
- 3 - EN 62506:2013
Annex ZA
(normative)
Normative references to international publications with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 60068
Series Environmental testing - -
IEC 60300-3-1 2003 Dependability management - Part 3-1: Application guide - Analysis techniques for dependability - Guide on methodology EN 60300-3-1 2004
IEC 60300-3-5
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 60721
Series Classification of environmental testing - -
IEC 61014 2003 Programmes for reliability growth EN 61014 2003
IEC 61124 + corr. January
2012 2013 Reliability testing - Compliance tests for constant failure rate and constant failure intensity EN 61124 2012
IEC 61163-2
Reliability stress screening -
Part 2: Electronic components - -
IEC 61164 2004 Reliability growth - Statistical test and estimation methods EN 61164 2004
IEC 61649 2008 Weibull analysis EN 61649 2008
IEC 61709 2011 Electric components - Reliability - Reference conditions for failure rates and stress models for conversion EN 61709 2011
IEC 61710
Power law model - Goodness-of-fit tests and estimation methods EN 61710
IEC 62303
Radiation protection instrumentation - Equipment for monitoring airborne tritium - -
IEC/TR 62380
Reliability data handbook - Universal model for reliability prediction of electronics components, PCBs and equipment - -
IEC 62429
Reliability growth - Stress testing for early failures in unique complex systems EN 62429
IEC 62506 Edition 1.0 2013-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Methods for product accelerated testing
Méthodes d'essais accélérés de produits
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XD ICS 03.120.01; 21.020 PRICE CODE CODE PRIX ISBN 978-2-83220-861-8
– 2 – 62506 © IEC:2013 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope . 8 2 Normative references . 8 3 Terms, definitions, symbols and abbreviations . 9 3.1 Terms and definitions . 9 3.2 Symbols and abbreviated terms . 11 4 General description of the accelerated test methods. 12 4.1 Cumulative damage model . 12 4.2 Classification, methods and types of test acceleration . 14 4.2.1 General . 14 4.2.2 Type A: qualitative accelerated tests . 15 4.2.3 Type B: quantitative accelerated tests . 15 4.2.4 Type C: quantitative time and event compressed tests . 16 5 Accelerated test models . 17 5.1 Type A, qualitative accelerated tests . 17 5.1.1 Highly accelerated limit tests (HALT) . 17 5.1.2 Highly accelerated stress test (HAST) . 21 5.1.3 Highly accelerated stress screening/audit (HASS/HASA) . 21 5.1.4 Engineering aspects of HALT and HASS . 22 5.2 Type B and C – Quantitative accelerated test methods . 23 5.2.1 Purpose of quantitative accelerated testing . 23 5.2.2 Physical basis for the quantitative accelerated Type B test methods . 23 5.2.3 Type C tests, time (C1) and event (C2) compression . 24 5.3 Failure mechanisms and test design . 26 5.4 Determination of stress levels, profiles and combinations in use and test – stress modelling . 27 5.4.1 General . 27 5.4.2 Step-by-step procedure . 27 5.5 Multiple stress acceleration methodology – Type B tests . 27 5.6 Single and multiple stress acceleration for Type B tests . 30 5.6.1 Single stress acceleration methodology . 30 5.6.2 Stress models with stress varying as a function of time – Type B tests . 37 5.6.3 Stress models that depend on repetition of stress applications – Fatigue models . 38 5.6.4 Other acceleration models – Time and event compression. 40 5.7 Acceleration of quantitative reliability tests . 40 5.7.1 Reliability requirements, goals, and use profile . 40 5.7.2 Reliability demonstration or life tests . 42 5.7.3 Testing of components for a reliability measure . 47 5.7.4 Reliability measures for components and systems/items . 48 5.8 Accelerated reliability compliance or evaluation tests . 48 5.9 Accelerated reliability growth testing . 50 5.10 Guidelines for accelerated testing . 50 5.10.1 Accelerated testing for multiple stresses and the known use profile . 50 5.10.2 Level of accelerated stresses . 51 SIST EN 62506:2014
62506 © IEC:2013 – 3 – 5.10.3 Accelerated reliability and verification tests . 51 6 Accelerated testing strategy in product development . 51 6.1 Accelerated testing sampling plan . 51 6.2 General discussion about test stresses and durations . 52 6.3 Testing components for multiple stresses . 53 6.4 Accelerated testing of assemblies . 53 6.5 Accelerated testing of systems . 53 6.6 Analysis of test results . 53 7 Limitations of accelerated testing methodology . 53 Annex A (informative)
Highly accelerated limit test (HALT) . 55 Annex B (informative)
Accelerated reliability compliance and growth test design . 59 Annex C (informative)
Comparison between HALT and conventional accelerated testing . 74 Annex D (informative)
Estimating the activation energy, Ea. 75 Annex E (informative)
Calibrated accelerated life testing (CALT) . 77 Annex F (informative)
Example on how to estimate empirical factors . 79 Annex G (informative)
Determination of acceleration factors by testing to failure . 84 Bibliography . 87
Figure 1 – Probability density functions (PDF) for cumulative damage, degradation, and test types . 13 Figure 2 – Relationship of PDFs of the product strength vs. load in use . 18 Figure 3 – How uncertainty of load and strength affects the test policy . 19 Figure 4 – PDFs of operating and destruct limits as a function of applied stress . 20 Figure 5 – Line plot for Arrhenius reaction model . 34 Figure 6 – Plot for determination of the activation energy . 35 Figure 7 – Multiplier of the test stress duration for demonstration of required reliability for compliance or reliability growth testing . 45 Figure 8 – Multiplier of the duration of the load application
for the desired reliability . 46 Figure B.1 – Reliability as a function of multiplier k and for combinations of parameters a and b . 61 Figure B.2 – Determination of the multiplier k . 64 Figure B.3 – Determination of the growth rate .
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