1、STDeBSI BS EN b2005-4-ENGL 2000 Lb24bb7 0827338 128 BRITISH STANDARD Reliability of fibre optic interconnecting devices and passive optical components - Part 4: Product screening The European Standard EN 620054.1999 has the status of a British Standard ICs 33.180.20 NO COPYING WITHOUT BSI PERMISSION
2、 EXCEPT AS PEEMITED BY COPYRIGHT LAW BS EN 62005-4:2000 EC 620054.1999 STD-BSI BS EN b2005-4-ENGL 2000 Lb24669 0829339 Ob4 BS EN 62006-4:2000 direction of the Electrotechnicai Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 March 2000 hd. No
3、. This British Standard is the official English language version of EN 620054: 1999. It is identical with IEC 6200541999. The UK participation in its preparation was entrusted by Technical Committee GEM, Fbre optics, to Subcommittee GEL/86/2, interconnecting devices and passive components, which has
4、 the responsibility to: D - present to the responsible inkrnational/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related intemational and European developments and promulgate ULtiii Li ilte un A ist of organizations re
5、presented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the
6、 other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to inkrna,tional publications with their corresponding European publications. The British Standard
7、s which implement these international or European publications may be found in the BSI Standars Catalogue under the section entitled “International Standards Correspondence Index“, or by using the “Find facility of the BSI Stanhds Electronic Catalogue. A British Standard does not purport to include
8、ali the necessasy provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages lus document comprises a front cover, an inside front cover, the EN tit
9、ie page, pages 2 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. O BSI 03-2000 I I ISBN O 580 34045 7 - STD-BSI BS EN 62005-4-ENGL 2000 Lb246b9 0829320 886 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 62005-4 November 19
10、99 ICs 33.1 80.20 English version Reliability of fibre optic interconnecting devices and passive optical components Part 4: Product screening (IEC 62005-4: 1 999) Fiabilit des dispositifs dinterconnexion et des composants optiques passifs fibres optiques Verbindungselemente und Partie 4: Slection de
11、s produits (CE1 62005-41999) Teil 4: Produktsortierprfung Betrie bszuverlssig keit von Lichtwellenleitern passive Bauteile (IEC 62005-41999) This European Standard was approved by CENELEC on 1999-1 0-01. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which stipulate th
12、e 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 exist
13、s 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 electr
14、otechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de No
15、rmalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stasssrt 35, B - 1050 Brussels 1999 CENELEC - All rights of emploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62005-41999 E STD.BSI BS EN b2005-4-ENGL
16、 2000 = lib24bb7 0827323 732 Page 2 EN 62005-4: 1 999 Foreword The text of document 866/121 2/FDIS, future edition 1 of IEC 62005-4, prepared by SC 86B, Fibre optic interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was appr
17、oved by CENELEC as EN 62005-4 on 1999-10-01. 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 with the EN have to be withdrawn - Iztze? Atz hich il roLi -Lai wids c,rifikiirig - id
18、entify stress limits of product design and materials, and ensure that the tests selected are within safe limits; identify the earliest possible step in the process to apply the screen process; validate the screen - effective and harmless to good products: 1) run the screen on a sample population of
19、product with known or deliberately induced defects of the type addressed by the screen. Ensure that the screening test effectively identifies defective products with a low rejection of good products; 2) run the screen on a “good“ population several times, then lifetest this population versus an unsc
20、reened population, to ensure that no unacceptable degradation in the product due to the performance of the screen has occurred; as the screen is implemented in normal production, track and report product fallout; f) continue to validate the relevance of a screen on an ongoing basis. O BSI 03-2000 Pa
21、ge 5 EN 62005-41999 4 Types of screens Screens are specific conditions designed to address known and understood failure mechanism(s). In that context, they can be any or all of the types shown below. The following list is not exhaustive, but merely provided for illustrative purposes: - thermal (prol
22、onged temperature); - thermal cycling; - humidity; - mechanical shock; - mechanical tension; - mechanical vibration. Where thermal cycling is applied in addition to other perturbations, it is recommended that thermal cycling be performed after mechanical tests, such as vibration. Parts which may be
23、affected by mechanical perturbation may appear good at normal laboratory temperature, but in fact may fail at lower or higher temperature extremes. The screens shall not have accelerated effects. The duration of screens shall be selected to put in evidence and to eliminate defects without affecting
24、component lifetime. 5 Ongoing validation of screen effectiveness Product screening is a process, not a test. As such, it requires ongoing validation of its effectiveness. This starts with monitoring product failure rates in processes and reactions to changes in those failure rates. It is possible th
25、at, with time and improvement of processes or materials, the screen no longer produces fallout of products, because the failure mechanism(s) have been eliminated in the process. In that case, the screen can be successfully eliminated. It is also possible that, with changes to processes or materials
26、over time, the level of severity or degree of acceleration may no longer be appropriate. Also, it is possible that degradation of the product by the screen may have begun to occur. For that reason, ongoing validation of the screen and its relationship to the failure mechanism(s) in question should b
27、e performed. 6 Conclusion Screening is a potential alternative to product redesign, in order to minimize early failures in a product population. Screens shall be properly applied to ensure that no degradation of product lifetime or effectiveness related to the failure mechanism(s) in question occurs
28、. Screens used on products shall also be maintained and validated on an ongoing basis, to ensure their effectiveness and relevance over time. Screening is a choice which shall never be mandatory, but chosen in the context of proper use, as a cost effective alternative to product design improvements.
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