1、BRITISH STANDARD Environmental testing Part 2. Tests Test Eh. Hammer tests BS EN 60068-2-75 : * * rn The European Standard EN 6OW2-75 : 1997 has the status of a British Standard ICs 19.040 1997 1997 IEC 60068-2-75 : NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW -3- COPYRIGHT
2、 European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesNational foreword This British Standard is the English language version of EN 600682-75 : 1997. It is identical with IEC 600682-75 : 1997. It supersedes BS EN 600682-62 : 1996 and BS EN 600682433 : 1995
3、which are withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEiJ50, Environmental testing of electrotechnical products, to Subcommittee GEL/50/1, Dynamic tests, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible
4、 international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed - monitor related international and European developments and promulgate them in the UK A list of organizations represented on this subcommittee can be obtained on reque
5、st 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 other, publications may contain identifiers from both
6、systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publi
7、cations may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. This Bri
8、tish Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes int,o effect on 15 December 1997 Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2
9、to 35, a blank page, an inside back cover and a back cover. Amendments issued since publication Amd. No. I Date I Text affected O BSI 1997 ISBN O 580 28778 5 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesEUROPEAN STANDARD NORME EUROPENNE EU
10、ROPISCHE NORM EN 60068-2-75 October 1997 ICs 19.040 Supersedes EN 60068-2-62: 1995 and EN 60068-2-631994 Descriptors: Environmental testing. test Eh: hammer tests, provisions common to all hammer tests, test Eha: pendu hammer, test Ehb: spring hammer. tes2 Ehc: vemcal hammer English version Environm
11、ental testing Part 2: Tests - Test Eh: Hammer tests (IEC 60068-2-75:1997) Essais denvironnement Umweitprfungen Partie 2: Essai Eh: Essais aux marteaux Teil 2: Prfungen (CE1 60068-2-75: 1997) Prfung Eh: Hammerprfungen (IEC 60068-2-75: 1997) This European Standard was approved by CENELEC on 1997-1 0-0
12、1. CENELEC members are bound to comply with the CENKENELEC Intmai Regulations which stipulate the conditions for giving this Europan Standard the status of a national standard without any alteration. Up-to-date lists and biblibgraphical references concerning such nationd standards may be obtained on
13、 application to the Cmuai Secretaria or to any CENEiEC member. mis European Standard exists in thrw official venions (English, French, German). A version in any other language matte by translation under the responsibility of a CENELEC member into its own language and notifid to the Centrai SecretMat
14、 has the same status as the official versions. Cj3ELEC members are the national elsctrotechnicai committees of Austria, Belgium, Denmark, Finland, Frame, Germany, Greece. Iceland, Irdand, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, SwiPsrland3n Unitd Kingdom. CENELEC European Co
15、mmittee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Staaaart 35.8 - 1050 Bruasda 1997 CENELEC - All rights of exploitation in any form and by any means reserved woddwida for CENELEC
16、members. Ref. No. EN 60068-2-751 997 E COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesForeword The text of document 50A/328/FDIS, future edition 1 of 1EC 60068-2-75, prepared by IEC TC 104, Environmental conditions, classification and method
17、s of test, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60068-2-75 on 1 997-1 0-01 . This European Standard supersedes EN 60068-2-62: 1995 and EN 60068-2-63: 1 994. The following dates were fixed: - latest date by which the EN has to be implemented at national lev
18、el by publication of an identical national standard or by endorsement (dop) 1998-07-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-07-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are
19、 given for information only. In this standard, annexes A, B and ZA are normative and annexes C, O and E are informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 60068-2-75:1997 was approved by CENELEC as a European Standard without any modifi
20、cation. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services. . * rn * STD-BSI BS EN bOOb-2-75-ENGL 1777 = Lb24bb7 Obb4b13 b27 W Page 3 EN 60068-2-75 : 1997 CONTENTS INTROD U CTIO N . Clause Scope . Normative references . Provisions common to all
21、 hammer test methods . 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 Definitions Severities . 3.2.1 General . 3.2.2 Impact energy value . Test apparatus . 3.3.2 Mounting . Preconditioning Initial measurements 3.6.1 Attitudes and impact locations 3.6.2 Preparation of the specimen . 3.6.3 Operating mode and fun
22、ctional monitoring . Recovery Final measurements Information to be given in the relevant specification 3.2.3 Number of impacts . 3.3.1 Description Testing . Test Eha: Pendulum hammer 4.1 Definitions 4.2 Test apparatus . Test apparatus for severities not exceeding 1 J . Test apparatus for severities
23、of 2 J and above . 4.3 Height of fall . 4.4 Testing . Test Ehb: Spring hammer 5.1 Test apparatus . 5.2 Influence of earths gravity . 5.3 Calibration Test E hc: Vertical hammer . 6.1 Definition 6.2 Test apparatus . 6.3 Height of fall . 4.2.1 4.2.2 Page 5 6 6 7 7 7 7 7 7 7 7 8 9 9 9 9 9 9 9 10 10 11 1
24、1 li 11 11 12 12 13 13 14 14 15 15 15 15 BSI 1997 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesSTD-BSI BS EN bUUbd-2-75-ENGL 1997 Lb24bb Ubb4bL4 5b3 Page 4 EN 60068-2-75 : 1997 Figures 1 Example sketch of the striking element 2 Derivation
25、of measuring point . 3 Shape of release head for 2 J A.1 Example of a striking element for I 1 J A.2 Example of a striking element for 2 J . A.3 Example of a striking element for 5 J . A.4 Example of a striking element for 10 J . A.5 Example of a striking element for 20 J 14.6 Example of a striking
26、element for 50 J B.l Calibration device . 8.2 Pendulum “cl . 8.3 Steel spring of pendulum “c“ . 8.4 Details of calibration device . B.5 Arrangement for the calibration of the Calibration device 8.6 Division of scale plate f . D.l Test apparatus II Il 0.2 Striking element of the pendulum hammer for e
27、nergies I 1 J . 0.3 Mounting fixture D.4 Adapter for flush-type switches D.5 Adapter for lamp holders . E.l Spring hammer test apparatus Annexes A 8 Procedure for the calibration of spring hammers . C Guidance . D Example of pendulum hammer test apparatus E Example of spring hammer test apparatus ZA
28、 (normative) Normative references to international publications with their corresponding European publications Shapes of striking elements . Page 8 12 13 16 16 17 17 18 18 21 22 23 24 25 26 30 30 31 31 32 34 16 19 27 29 33 35 O BSI 1997 COPYRIGHT European Committee for Electrotechnical Standardizati
29、onLicensed by Information Handling Services - STD-BSI BS EN bIJDbA-2-75-ENGL 1777 W Lb24bb9 Obb4bL5 LITT = Page 5 EN 60068-2-75 : 1997 INTRODUCTION Mechanical impacts likely to stress electrotechnical equipment in service can be generated by hammers of various types. For standardization purposes, th
30、e results of such testing should not depend on the type of testing apparatus and therefore, the characteristics of the various types of test hammers described in this part of IEC 60068 are intended to be as close as practicable for the same severity level. It is important to note that both clause 3
31、and the test method selected from clauses 4, 5, and 6 need to be complied with in order to satisfy the requirements of this International Standard. The severity levels are, in general, taken from IEC 60721 -1. For co-ordination purposes, it has been necessary to change certain fundamental parameters
32、 of the previous tests Ef: Impact, pendulum hammer, and Eg: Impact, spring hammer. In all cases, both sets of parameters are shown at the appropriate places in the text and will remain valid until five years from the publication of this part of IEC 60068. At that time, the values in brackets will be
33、 removed. * * VI COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesSTD-BSI BS EN bb8-2-75-ENGL 1777 = Lb24bb7 ObblibLb 33b Page 6 EN 60068-2-75 : 1997 ENVIRONMENTAL TESTING - Part 2: Tests - Test Eh: Hammer tests 1 Scope This part of IEC 60068
34、provides three standardized and co-ordinated test methods for determining the ability of a specimen to withstand specified severities of impact. It is used, in particular, to demonstrate an acceptable level of robustness when assessing the safety of a product and is primarily intended for the testin
35、g of electrotechnical items. It consists of the application to the specimen of a prescribed number of impacts defined by their impact energy and applied in the prescribed directions. This part of IEC 60068 covers energy levels ranging from 0,14 joules (J) to 50 joules (J). Three types of test appara
36、tus are applicable to perform these tests. Annex C provides some guidance as to this aspect. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 60068. At the time of publication, the editions in
37、dicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 60068 should investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and IS0 maintain registers of currently valid Internati
38、onal Standards. IEC 60068-1 : 1988, Environmental testing - Part 7: General and guidance IEC 60721 -1 : 1990, Classification of environmental conditions - Part 1: Environmental parameters and their severities Amendment 1, 1992 IS0 1052: 1982, Steels for general engineering purposes IS0 2039-2: 1987,
39、 Plastics - Determination of hardness - Part 2: Rockwell hardness IS0 2041: 1990, Vibration and shock - Vocabulary IS0 2768-1 : 1989, General tolerances - Part 7: Tolerances for linear and angular dimensions without individual tolerances indicated IS0 6508: 1986, Metallic materials - Hardness test -
40、 Rockwell test (scales A - B - C - D - E - F-G- H-K) COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services3 Provisions common to all hammer test methods 3.1 Definitions For the purpose of this part of IEC 60068, the terms used are generally define
41、d in IS0 2041 or in IEC 60068-1. The following additional common definitions are also applicable for the purpose of this part of IEC 60068. Definitions specific to the tests of clauses 4 and 6 are given therein. 3.1.1 fixing point: Part of the specimen in contact with the mounting fixture at the poi
42、nt where the specimen is normally fastened in service. 3.1.2 equivalent mass: Mass of the striking element and any relevant portions of the test apparatus which, combined with its velocity, provides the impact energy. NOTE - For the particular application to the pendulum hammer apparatus, see 4.1 3.
43、 3.2 Severities 3.2.1 General The severity is defined by the impact energy value chosen from 3.2.2, and the number of impacts according to 3.2.3. * * vi 3.2.2 Impact energy value The impact energy value shall be one of the following, as prescribed by the relevant specification: 0,14 - 0,2 - (0,3) -
44、0,35 - (0,4) - 0,5 - 0,7 - 1 - 2 - 5 - 10 - 20 - 50 joules. NOTE - Figures in brackets appear in current IEC 60068-2 standards, but will be removed five years from the date of publication of this standard. 3.2.3 Number of impacts Unless otherwise prescribed by the relevant specification, the number
45、of impacts shall be three per location. 3.3 Test apparatus 3.3.1 Description Three types of test apparatus are available to perform these tests: - the pendulum hammer; - the spring hammer; - the vertical hammer. The types of test apparatus are defined in clauses 4, 5 and 6 as tests Eha, Ehb and Ehc
46、respectively. The co-ordinated characteristics of the striking element are, in principle, similar in ali three cases and are stated in table 1, in relation to the outline shown in figure 1. Dimensions are in millimetres. Tolerances are as per class m of IS0 2768-1, unless otherwise stated. COPYRIGHT
47、 European Committee for Electrotechnical StandardizationLicensed by Information Handling Services STD.BSI BS EN bb-2-75-ENGL lqq7 Lb24bb7 Obb4bL = Page 8 EN 60068-2-75 : 1997 Energy value Cl 2 5 10 20 J f10 Yo f5 % f5 Yo f5% I5% Equivalent mass 025 (02) 0,s 1,7 5 5 f2% kg Table 1 - Co-ordinated char
48、acteristics of the striking elements 50 f5% 10 I D mm I 18,5 (20) I 35 I 60 I 80 I 100 I 125 Material a mm Pol yamidel) SteeW 10 25 I 25 50 50 50 851HRR100, Rockwell hardness according to IS0 2039-2. 2) Fe 490-2, according to IS0 1052: Rockwell hardness: HRE 80 . 85 according to IS0 6508. f mm r mm
49、I mm NOTE - The values shown in brackets for the equivalent mass and the diameter of the striking element for the energy value equal to or less than 1 J are those in the current test Ef. The values currently in test Eg are also shown for these two parameters. For co-ordination purposes, the values in brackets will be deleted five years from the publication of this standard. 1 O0 6,2(10) 7 10 20 20 25 - - 6 - 10 17 To be adjusted to match the equivalent mass, see annex A. f( I I -I IEC %a47 Figure 1 - Example sketch of a striking e
