1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsWB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1Environmental testing Part 2-27: Tests Test Ea and guidance: ShockBS EN 60068-2-27:2009National forewordThis Brit
2、ish Standard is the UK implementation of EN 60068-2-27:2009. It isidentical to IEC 60068-2-27:2008. It supersedes BS EN 60068-2-27:1993 andBS EN 60068-2-29:1993, which are withdrawn.The UK participation in its preparation was entrusted to Technical CommitteeGEL/104, Environmental conditions, classif
3、ication and testing.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2009 ISBN 978 0 580 55735 4 ICS 19.040Co
4、mpliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2009Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60068-2-27:2009EURO
5、PEAN STANDARD EN 60068-2-27 NORME EUROPENNE EUROPISCHE NORM May 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: avenue Marnix 17, B - 1000 Brussels 2009 CENELEC
6、- All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60068-2-27:2009 E ICS 19.040 Supersedes EN 60068-2-27:1993 and EN 60068-2-29:1993English version Environmental testing - Part 2-27: Tests - Test Ea and guidance: Shock (IEC 60068-2-27:2008)
7、Essais denvironnement - Partie 2-27: Essais - Essai Ea et guide: Chocs (CEI 60068-2-27:2008) Umgebungseinflsse - Teil 2-27: Prfverfahren - Prfung Ea und Leitfaden: Schocken (IEC 60068-2-27:2008) This European Standard was approved by CENELEC on 2009-04-22. CENELEC members are bound to comply with th
8、e 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 o
9、r 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 offic
10、ial versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal,
11、 Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 60068-2-27:2009 2 Foreword The text of document 104/448/FDIS, future edition 4 of IEC 60068-2-27, prepared by IEC TC 104, Environmental conditions, classification and methods of test, was submitted to the IEC-CENELEC
12、 parallel vote and was approved by CENELEC as EN 60068-2-27 on 2009-04-22. This European Standard supersedes EN 60068-2-27:1993 and EN 60068-2-29:1993. The major technical changes with regard to EN 60068-2-27:1993 concern: the merging of EN 60068-2-29:1993 into this Part 2-27; the introduction of so
13、ft packaged specimens as defined in the IEC ad hoc working group document agreed in Stockholm:2000. This standard is to be used in conjunction with EN 60068-1. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national
14、standard or by endorsement (dop) 2010-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2012-05-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60068-2-27:2008 was approved by CENELEC as a Europ
15、ean Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60068-2-31 NOTE Harmonized as EN 60068-2-31:2008 (not modified). IEC 60068-2-81 NOTE Harmonized as EN 60068-2-81:2003 (not modified). ISO/IEC 17025
16、NOTE Harmonized as EN ISO/IEC 17025:2005 (not modified). _ BS EN 60068-2-27:2009 3 EN 60068-2-27:2009 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of thi
17、s document. 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
18、. Publication Year Title EN/HD Year IEC 60068-1 - 1)Environmental testing - Part 1: General and guidance EN 60068-1 1994 2)IEC 60068-2-47 2005 Environmental testing - Part 2-47: Tests - Mounting of specimens for vibration, impact and similar dynamic testsEN 60068-2-47 2005 IEC 60068-2-55 - 1)Environ
19、mental testing - Part 2-55: Tests - Test Ee and guidance: Bounce EN 60068-2-55 1993 2)IEC 60721-3-1 - 1)Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 1: Storage EN 60721-3-1 1997 2)IEC 60721-3-5 - 1)Classifica
20、tion of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 5: Ground vehicle installations EN 60721-3-5 1997 2)IEC Guide 104 - 1)The preparation of safety publications and the use of basic safety publications and group safety public
21、ations 1) Undated reference. 2) Valid edition at date of issue. BS EN 60068-2-27:2009 2 60068-2-27 IEC:2008 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references7 3 Terms and definitions .8 4 Description of test apparatus 9 4.1 Required characteristics 9 4.2 Measuring system11 4.3 Moun
22、ting .12 5 Severities .13 6 Preconditioning.14 7 Initial measurements and functional performance test .15 8 Testing .15 9 Recovery 15 10 Final measurements .15 11 Information to be given in the relevant specification.15 12 Information to be given in the test report .16 Annex A (normative) Selection
23、and application of pulse shapes Guidance17 Annex B (informative) Shock response spectra and other characteristics of pulse shapes27 Annex C (informative) Comparison between impact tests36 Bibliography37 Figure 1 Pulse shape and limits of tolerance for half-sine pulse 10 Figure 2 Pulse shape and limi
24、ts of tolerance for final-peak saw-tooth pulse.10 Figure 3 Pulse shape and limits of tolerance for trapezoidal pulse.11 Figure 4 Frequency characteristics of the overall measuring system .12 Figure A.1 Shock response spectrum of a symmetrical half-sine pulse19 Figure A.2 Shock response spectrum of a
25、 final-peak saw-tooth pulse .20 Figure A.3 Shock response spectrum of a symmetrical trapezoidal pulse 21 Figure B.1 Framework or box containing oscillatory systems of which f1, f2and f3are examples of resonance frequencies 27 Figure B.2a Exciting pulse29 Figure B.2b Responses for f1, f2and f3.29 Fig
26、ure B.2c Spectra which result from an infinite number of frequencies, with f1, f2and f3shown as finite points on the continuous curves.29 Figure B.2 Shock response spectrum concept 29 Figure B.3 Framework containing damped multi-degree-of-freedom system 31 Figure B.4 Shock response spectrum of a hal
27、f-sine pulse with ripple33 BS EN 60068-2-27:200960068-2-27 IEC:2008 3 Figure B.5 Spectrum of a final-peak saw-tooth 300 m/s2, 18 ms pulse compared with the spectra of 200 m/s2half-sine pulses with durations between 3 ms and 20 ms 35 Table 1 Severities for shock testing 14 Table A.1 Examples of pulse
28、 shapes and test severities typically employed for various applications.23 Table A.2 Examples of severities typically employed for various applications 24 BS EN 60068-2-27:2009 4 60068-2-27 IEC:2008 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ENVIRONMENTAL TESTING Part 2-27: Tests Test Ea and guidan
29、ce: Shock FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardizat
30、ion in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is e
31、ntrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the Int
32、ernational Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects sinc
33、e each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content
34、of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible i
35、n their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment d
36、eclared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC Nati
37、onal Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention i
38、s drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shal
39、l not be held responsible for identifying any or all such patent rights. International Standard IEC 60068-2-27 has been prepared by IEC technical committee 104: Environmental conditions, classification and methods of test This fourth edition cancels and replaces the third edition, published in 1987,
40、 and includes the merging of IEC 60068-2-29, second edition (1987). It constitutes a technical revision. The major changes with regard to the previous edition concern: the merging of IEC 60068-2-29 into this edition of IEC 60068-2-27; Part 2-29 will be withdrawn as soon as this edition is published;
41、 the introduction of soft packaged specimens as defined in the IEC ad hoc working group document agreed in Stockholm:2000. BS EN 60068-2-27:200960068-2-27 IEC:2008 5 The text of this standard is based on the following documents: FDIS Report on voting 104/448/FDIS 104/457/RVD Full information on the
42、voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. It has the status of a basic safety publication in accordance with IEC Guide 104. This standard is to be us
43、ed in conjunction with IEC 60068-1. A list of all the parts in the IEC 60068 series, under the general title Environmental testing, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on th
44、e IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS EN 60068-2-27:2009 6 60068-2-27 IEC:2008 INTRODUCTION This part of IEC 60068 deals with components
45、, equipments and other electrotechnical products, hereinafter referred to as “specimens”, which, during transportation, storage and handling, or in use, may be subjected either to conditions involving relatively infrequent non-repetitive or repetitive shocks. The shock test may also be used as a mea
46、ns of establishing the satisfactory design of a specimen in so far as its structural integrity is concerned and as a means of quality control. It consists of subjecting a specimen either to non-repetitive or repetitive shocks of standard pulse shapes with specified peak acceleration and duration. Sp
47、ecification writers will find a list of details to be considered for inclusion in specifications in Clause 11. The necessary guidance is given in Annex A. BS EN 60068-2-27:200960068-2-27 IEC:2008 7 ENVIRONMENTAL TESTING Part 2-27: Tests Test Ea and guidance: Shock 1 Scope This part of IEC 60068 prov
48、ides a standard procedure for determining the ability of a specimen to withstand specified severities of non-repetitive or repetitive shocks. The purpose of this test is to reveal mechanical weakness and/or degradation in specified performances, or accumulated damage or degradation caused by shocks.
49、 In conjunction with the relevant specification, this may be used in some cases to determine the structural integrity of specimens or as a means of quality control (see Clause A.2). This test is primarily intended for unpackaged specimens and for items in their transport case when the latter may be considered to be part of the specimen. If an item is to be tested unpackaged, it is referred to as a test specimen. Howe
