1、 IEC 60068-2-27Edition 4.0 2008-02INTERNATIONAL STANDARD NORME INTERNATIONALEEnvironmental testing Part 2-27: Tests Test Ea and guidance: Shock Essais denvironnement Partie 2-27: Essais Essai Ea et guide: Chocs IEC60068-2-27:2008 BASIC SAFETY PUBLICATION PUBLICATION FONDAMENTALE DE SCURITTHIS PUBLIC
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16、actez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60068-2-27Edition 4.0 2008-02INTERNATIONAL STANDARD NORME INTERNATIONALEEnvironmental testing Part 2-27: Tests Test Ea and guidance: Shock Essais denvironnement Partie 2-27: Essais Essai Ea et guide: Chocs INTERNATIONAL ELE
17、CTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE WICS 19.040 PRICE CODECODE PRIXISBN 2-8318-9628-2BASIC SAFETY PUBLICATION PUBLICATION FONDAMENTALE DE SCURIT 2 60068-2-27 IEC:2008 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references7 3 Terms and definitions .8 4 Des
18、cription 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 and functional performance test .15 8 Testing .15 9 Recovery 15 10 Final measurements .15 11 Information to be given in the relevant specif
19、ication.15 12 Information to be given in the test report .16 Annex A (normative) Selection 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
20、 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 shape and limits of tolerance for trapezoidal pulse.11 Figure 4 Frequency characteristics of the overall measuring system .12 Figure A.1 Shock r
21、esponse 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 a symmetrical trapezoidal pulse 21 Figure B.1 Framework or box containing oscillatory systems of which f1, f2and f3are examples of resonanc
22、e 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, with f1, f2and f3shown as finite points on the continuous curves.29 Figure B.2 Shock response spectrum concept 29 Figure B.3 Framework cont
23、aining damped multi-degree-of-freedom system 31 Figure B.4 Shock response spectrum of a half-sine pulse with ripple33 60068-2-27 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
24、35 Table 1 Severities for shock testing 14 Table A.1 Examples of pulse shapes and test severities typically employed for various applications.23 Table A.2 Examples of severities typically employed for various applications 24 4 60068-2-27 IEC:2008 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ENVIRONME
25、NTAL TESTING Part 2-27: Tests Test Ea and guidance: 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-op
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34、on or any other IEC Publications. 8) Attention is 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 Publicati
35、on may be the subject of patent rights. IEC shall 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 an
36、d replaces the third edition, published in 1987, 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
37、 withdrawn as soon as this edition is published; the introduction of soft packaged specimens as defined in the IEC ad hoc working group document agreed in Stockholm:2000. 60068-2-27 IEC:2008 5 The text of this standard is based on the following documents: FDIS Report on voting 104/448/FDIS 104/457/R
38、VD Full information on the 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
39、. This standard is to be used 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
40、result date indicated on the 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. 6 60068-2-27 IEC:2008 INTRODUCTION This part of IEC 60068 deals with compo
41、nents, 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
42、a means 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 duratio
43、n. Specification 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. 60068-2-27 IEC:2008 7 ENVIRONMENTAL TESTING Part 2-27: Tests Test Ea and guidance: Shock 1 Scope This part of IEC 60068 provides a standard
44、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. In conjunction
45、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
46、 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 a product and the item and its packaging together are referred to as a test specimen. When used in conjunction with IEC 60068-2
47、-47, this standard may be used for testing packaged products. This possibility was included in the 2005 version of IEC 60068-2-47 for the first time. This standard is written in terms of prescribed pulse shapes. Guidance for the selection and application of these pulses is given in Annex A and the c
48、haracteristics of the different pulse shapes are discussed in Annex B. Wherever possible, the test severity and the shape of the shock pulse applied to the specimen should be such as to reproduce the effects of the actual transport or operational environment to which the specimen will be subjected,
49、or to satisfy the design requirements if the object of the test is to assess structural integrity (see Clauses A.2 and A.4). For the purposes of this test, the specimen is always mounted to the fixture or the table of the shock testing machine during testing. NOTE The term “shock testing machine” is used throughout this standard, but other means of applying pulse shapes are not e
