BS EN 60068-2-77-1999 Environmental testing - Test methods - Body strength and impact shock《环境试验 试验方法 整体强度和冲击》.pdf

1、STD-BSI BS EN bOOb8-2-77-ENGL 3999 3b24bb9 0794323 b35 9 BS EN 60068-2-77: 1999 IEC 60068-2-77:1999 BRITISH STANDARD Environmental testing - Part 2-77: Tests - Test 77: Body strength and impact shock The European Standard EN 600682-77:19!39 has the status of a British Stanclard ICs 19.040 NO COPYING

2、 WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGIPT LAW - STD=BSI BS EN 600b8-2-77-ENGL 1797 lb24bb9 0794124 551 - Amd.No. Date BS EN 60068-2-77:1999 comments. National foreword This British Standard is the English language version of EN 600682-77 1999. It is identical with lEC 600682-77: 1999

3、. The UK participation in its preparation was entrusted to Technical Committee EPU501, Electronic assembly technology, which has the responsibility to: - aid enquirem to understand the text; - present to the responsible intemational/European committee any enquiries on the interpretation, or proposal

4、s for change, and keep the UK interests informed; - monitor related intemationai and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000

5、 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 systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standa

6、rds normally include an annex which lists normative references to internationai publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “Inte

7、mational Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a

8、British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the d

9、ocument was last issued. This British Standard, having been prepared under the direction of the Eectrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 September 1999 Q BSI 09-1999 ISBN O 580 32528 8 STD-BSI BS EN bOObB-2-77-ENGL 199

10、9 1b24bb7 0794325 498 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60068-2-77 April 1999 ICs 19.040; 31.190 English version Environmental testing Part 2-77: Tests - Test 77: Body strength and impact shock (IEC 60068-2-77: 1 999) Essais denvironnement Partie 2-77: Essais Essai 77: Rsistance d

11、u corps et rsistance au choc par impact (CE1 60068-2-771999) Umweltprfungen Teil 2-77: Prfungen Prfung 77: Krperfestigkeit und Sc hlagprf ung (IEC 60068-2-771999) This European Standard was approved by CENELEC on 1999-04-01. CENELEC members are bound to comply with the CENKENELEC Internal Regulation

12、s 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 or to any CENELEC member. This Eur

13、opean 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 official versions. CENELEC members are

14、the national electrotechnical 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

15、Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels * 1999 CENELEC - All rights of exploitation in any form and by any means resewed worldwide for CENELEC members. Ref. No. EN 80068-2-77:1999 E ST

16、D=BSI BS EN bOOb8-2-77-ENGL 1997 = Lb24bb9 079412b 324 Page 2 EN 60068-2-77:1999 Foreword The text of document 91/155/FDIS, future edition 1 of IEC 60068-2-77, prepared by IEC TC 50, Environmental testing and published by IEC TC 91, Surface mounting technology, was submitted to the IEC-CENELEC paral

17、lel vote and was approved by CENELEC as EN 60068-2-77 on 1999-04-01. 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 (dop) 2000-0 1 -O 1 - latest date by which the national standa

18、rds conflicting with the EN have to be withdrawn (dow) 2002-01 -O1 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA is normative and annex A is informative. Annex ZA has been added by CENE

19、LEC. Endorsement notice The text of the International Standard IEC 60068-2-77:1999 was approved by CENELEC as a European Standard without any modification. In the official version, for annex A, Bibliography, the following note has to be added for the standard indicated: IEC 60068-2-2 1 NOTE: Harmoni

20、zed as EN 60068-2-2 1 : 1 999 (not modified). STD-BSI BS EN 60068-2-77-ENGL 1999 = 1624667 0794327 260 Page 3 EN 60068-2-77:1999 CONTENTS Page 1 2 3 4 5 6 Scope and object Normative reference Terms and definitions Test methods 4.1 Body strength . 4.2 Impact shock . Test 5.1 Equipment . 5.2 Precondit

21、ioning . 5.3 Initial measurements 5.4 Test procedure . 5.5 Recovery . 5.6 Final measurement Information to be given in the relevant specification . Figurer Annex A (informative) - Bibliography . Annex ZA (normative) Normative references to international publications with their corresponding European

22、 publications 4 4 4 4 4 5 5 5 5 5 6 6 8 6 7 11 12 Q BSI 09-1 999 Page 4 EN 60068-2-77:1999 ENVIRONMENTAL TESTING - Part 2-77: Tests - Test 77: Body strength and impact shock 1 Scope and object This part of IEC 60068 provides test methods applicable to surface mounting devices (SMDs) made of glass or

23、 sintered materials such as capacitors, resistors and inductors incorporating ferrites. Two test methods exist: body strength and impact shock. The object of both tests is to evaluate the mechanical stresses applied to SMDs during and after mounting; these tests look at different mechanical stresses

24、. The relevant component specification shall specify which test method or methods are applicable. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this pari of IEC 60068. At the time of publication, the edition

25、 indicated was valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 60068 are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and IS0 maintain registers of c

26、urrently valid International Standards. IEC 601 94:-, Terms and definitions for printed circuits 3 Terms and definitions For the purpose of this part of IEC 60068, the terms and definitions given in IEC 601 94 apply. 4 Test methods 4.1 Body strength This test evaluates the strength of the body of th

27、e SMD against external static forces which are applied to them during mounting, in the direction perpendicular to the printed board on which the SMDs are mounted. NOTE - The test evaluates the sturdiness of the body of the SMDs and not the adhesive strength at the interface between the termination a

28、nd solder of the body. These latter tests are described in IEC 60088-2-21. This test simulates the static force applied to SMDs during picking up and centering in a placement process with a rather slow speed mounting machine in which the forces are mainly of a static nature. A static force can have

29、a different influence on a device from that of a dynamic force, whose effects can be evaluated by a test separately described as an impact shock test. This sirnulates the mechanical stress applied to the SMDs, during and after mounting the SMDs on a printed board. This test shall be referred to in t

30、he relevant detail specification. Page 6 EN 60068-2-77:1999 4.2 Impact shock This test evaluates the physical resistance of SMDs against impact shock. This test simulates the dynamic forces applied by picking and placing tools on a high speed mounting machine. The influence of a dynamic force on a d

31、evice can differ from the influence of a static force. This test shall be referred to in the relevant detail specification. 5 Test 5.1 Equipment a) Body strength equipment The equipment shall be able to apply the specified force to the specimen and maintain the test load for the specified duration.

32、The length (L) of the tip of the pushing tool shall be wider than the width (W) of the specimen under test. Unless otherwise specified in the relevant specification, the shape of the tip of the pushing tool shall be chamfered with a radius of 0,5 mm. The thickness of the pushing tool is not specifie

33、d (see figure 1). If this specification cannot be applied due to the shape or construction of the specimen under test or for any other reason, the shape of the pushing tool shall be specified in the relevant specification. The equipment shall be able to apply the specified potential energy to the sp

34、ecimen. The principle of the equipment is given in figure 4. The potential energy is given by the following formula: b) Impact shock equipment EP(J) = m(g) g h (cm) lo- where E, is the potential energy; m is the load (weight of collet, shaft and additional weight); g is the gravity; h is the height.

35、 The equipment shall be capable of generating a specified impact energy to a specimen by dropping a load (collet and weight) (see figure 5). No apparent friction shall be experienced when the collet and weight are dropped. The material of the base of the equipment shall be made of metal in excess of

36、 1 cm thick, having a sufficiently larger area than the specimen to be tested and weighing more than 2 kg. There shall be no material under the base which might reduce the impact energy, such as an elastomer sheet. The equipment shall be placed on a concrete floor or equivalent rigid structure. The

37、construction and dimensions of the specimen holding jig shall be given in the relevant specification. 5.2 Preconditioning Specimens which need preconditioning shall be pretreated in accordance with the relevant specif cat ion. 5.3 Initial measurements Visual inspection of the specimen shall be made

38、with the assistance of a magnification of at least lox under adequate lighting (e.9. 2 O00 lx). If specified in the relevant specification, electrical and/or mechanical characteristics shall be measured. STDmBSI BS EN b0066-2-77-ENGL 1799 m Lb24bb7 0794330 655 Page 6 EN 60068-2-77:1999 5.4 lest proc

39、edure 5.4.1 Testing shall include the following steps. a) Unless otherwise sDecified in the relevant sp Test method 1: body strength cificatia the cimen sh II be placed on the supporting base, shown in figures 2 and 3, so that both ends of the specimen are symmetrically positioned on the supporting

40、base. The test table shall be placed on a plane, robust platform so that the test results shall not be effected when the load is applied. The angle of the taper of section “A“ in figure 2 shall be greater than 70“, but less than 90“. b) The shapes and supporting base shall be specified in the releva

41、nt specification for different types of SMDs. Two typical examples are given in figures 2 and 3. c) Apply pressure to the centre of the specimen, using the pushing tool shown in figures 2 and 3), to reach the specified load within 5 s and maintain the pressure for (10 * 1) s. The load shall be 10 N

42、unless otherwise specified by the relevant specification. d) Unless otherwise specified, electrical measurements shall be made during the load application, in accordance with the relevant specification. 5.4.2 Test method 2: impact shock Testing shall include the following steps. a) The specimen shal

43、l be mounted on the apparatus as shown in figure 5. A dropping load shall be applied to the centre surface of the specimen from the dropping height, in each of three directions, X, Y and Z axes, once on each side, as illustrated in figure sa). If it is difficult to apply a load in all three directio

44、ns, due to the shape of the specimen or termination construction (see figure 6b), refer to the relevant specification. b) A load (weight of collet, shaft and additional weight) shall be dropped freely onto a specimen from specified drop height. Additional weight may be added to the shaft, in accorda

45、nce with the relevant specification. The tip shape of the collet shall be in accordance with figure 7. A tip diameter of 1,8 mm shall be used for rectangular specimens where the height or width is between 2,O mm and 4,O mm, or for a cylindrical specimen where the length is between 2,O mm and 4.0 mm.

46、 For larger specimens which are 4,O mm or more, the tip diameter shall be 4,O mm. The hardness of the tip shall be suitable for the mechanical property of the specimen to be tested. 5.5 Recovery Where a specimen requires recovery treatment, this shall be given in the relevant specification. 5.6 Fina

47、l measurement Inspection of the specimen appearance for any damage, such as cracks or flaws, shall be made with the assistance of a magnification of at least lox, under adequate light (e.g. 2 O00 ix). If the electrical and/or mechanical properties of the specimen require testing, this shall be speci

48、fied in the relevant specification. Page 7 EN 60068-2-77:1999 6 Information to be given in the relevant specification When this test is included in a relevant specification, it shall be stated which clauses are applicable as well as which are mandatory. Subclause Method of test: body strength or imp

49、act shock or both . Shape of pushing tool for body strength Construction and dimensions of the specimen holding jig for impact shock . Method of preconditioning . 5.2 4.1, 4.2 5.la 5.1 b Initial measurements . 5.3 Supporting base 5.4.1a, 5.4.1 b Load . 5.4.1 Measurements to be made during testing 5.4.ld Loads direction and height 5.4.2a Load weight of the collet and shaft . 5.4.2b Additionalweight . 5.4.2b Recovery conditions 5.5 Final measurements . 5.6 Acceptance criteria . 5.6 IEC 1777/98 Dimensions in millimeires NOTE - The radius of pushing tool (R) should