1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsEnvironmental testing Part 2-27: Tests Test Ea and guidance: ShockBS EN 60068-2-27:2009National forewordThis British Standard is the UK implementation of EN 60068-2-27:2009. It iside
2、ntical 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 It supersedes BS EN 60068-2-27:1993 andBS EN 60068-2-29:1993, which are withdrawn.The UK participation in its preparation was entrusted to Technical CommitteeGEL/104, Environmental conditions, classification and testing.A list of organizations represented on this commi
3、ttee 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 19.040Compliance with a British Standard cannot confer immunity from legal ob
4、ligations.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 60068-2-27:2009EUROPEAN STANDARD EN 60068-2-27 NORME EUROPENNE EUROPISCHE NORM May 2009
5、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 - All rights of exploitation in any form and by any means reserved wo
6、rldwide 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) Essais denvironnement - Partie 2-27: Essais - Essai Ea et guide: Choc
7、s (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 the CEN/CENELEC Internal Regulations which stipulate the conditions for
8、 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 exists in three offic
9、ial 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 electrotechnical commi
10、ttees 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the Unit
11、ed 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 parallel vote and was approved by CENELEC as EN 60068-2-27 on 2009-0
12、4-22. 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 soft packaged specimens as defined in the IEC ad hoc working group docu
13、ment 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 standard or by endorsement (dop) 2010-02-01 latest date by which the
14、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 European Standard without any modification. In the official version, for B
15、ibliography, 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 NOTE Harmonized as EN ISO/IEC 17025:2005 (not modified). _ BS EN 6006
16、8-2-27:2009 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 this document. For dated references, only the edition cited applies. For
17、 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 60068-1 - 1)Environmental tes
18、ting - 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)Environmental testing - Part 2-55: Tests - Test Ee and guidance: Bounce EN 6
19、0068-2-55 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)Classification of environmental conditions - Part 3: Classification of groups o
20、f 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 publications 1) Undated reference. 2) Valid edition at date of issue. BS EN
21、 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 Mounting .12 5 Severities .13 6 Preconditioning.14 7 Initial measurements
22、 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 and application of pulse shapes Guidance17 Annex B (informative) Shoc
23、k 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 limits of tolerance for final-peak saw-tooth pulse.10 Figure 3 Pulse shap
24、e 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 final-peak saw-tooth pulse .20 Figure A.3 Shock response spectrum of
25、 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 Figure B.2c Spectra which result from an infinite number of frequencies,
26、 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 half-sine pulse with ripple33 BS EN 60068-2-27:200960068-2-27 IEC:2008 3
27、 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 shapes and test severities typically employed for various applicatio
28、ns.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 guidance: Shock FOREWORD 1) The International Electrotechnical Commission (
29、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 standardization in the electrical and electronic fields. To this end and in addit
30、ion 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 entrusted to technical committees; any IEC National Committee interest
31、ed 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 International Organization for Standardization (ISO) in accordance with
32、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 since each technical committee has representation from all interested IEC
33、 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 of IEC Publications is accurate, IEC cannot be held responsible for t
34、he 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 in their national and regional publications. Any divergence between an
35、y 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 declared to be in conformity with an IEC Publication. 6) All users sho
36、uld 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 National Committees for any personal injury, property damage or other dam
37、age 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 is drawn to the Normative references cited in this publication. Use of
38、 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 shall not be held responsible for identifying any or all such patent righ
39、ts. 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, and includes the merging of IEC 60068-2-29, second edition (1987). I
40、t 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; the introduction of soft packaged specimens as defined in the IEC ad
41、 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 voting for the approval of this standard can be found in the report o
42、n 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 used in conjunction with IEC 60068-1. A list of all the parts in the IE
43、C 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 the IEC web site under “http:/webstore.iec.ch“ in the data related to t
44、he 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, equipments and other electrotechnical products, hereinafter referre
45、d 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 means of establishing the satisfactory design of a specimen in so far as
46、 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. Specification writers will find a list of details to be considered for
47、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 provides a standard procedure for determining the ability of a specimen t
48、o 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. In conjunction with the relevant specification, this may be used in
49、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. However, if the item is packaged, then the item itself is referred to as
