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1、BRITISH STANDARD BS EN 60068-2-21: 2006 Environmental testing Part 2-21: Tests Test U: Robustness of terminations and integral mounting devices The European Standard EN 60068-2-21:2006 has the status of a British Standard ICS 19.040; 31.190 ? Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08
2、:06:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60068-2-21:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 BSI 2006 ISBN 0 580 49211 7 National foreword This British Standard was published by BSI. It is the UK imp
3、lementation of EN 60068-2-21:2006. It is identical with IEC 60068-2-21:2006. It supersedes BS EN 60068-2-21:1999 which will be withdrawn on 1 July 2009. The UK participation in its preparation was entrusted to Technical Committee EPL/501, Electronic assembly technology. A list of organizations repre
4、sented on EPL/501 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issu
5、ed since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:06:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 60068-2-21 NORME EUROPENNE EUROPISCHE NORM July 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europe
6、n de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60068-2-21:2006 E ICS 19.040; 31.
7、190 Supersedes EN 60068-2-21:1999 English version Environmental testing Part 2-21: Tests - Test U: Robustness of terminations and integral mounting devices (IEC 60068-2-21:2006) Essais denvironnement Partie 2-21: Essais - Essai U: Robustesse des sorties et des dispositifs de montage incorpors (CEI 6
8、0068-2-21:2006) Umweltprfungen Teil 2-21: Prfungen - Prfung U: Widerstandsfhigkeit der Anschlsse und integrierter Befestigungsmittel (IEC 60068-2-21:2006) This European Standard was approved by CENELEC on 2006-07-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
9、 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 European S
10、tandard 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 the na
11、tional electrotechnical committees of Austria, Belgium, 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, Switz
12、erland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:06:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 Foreword The text of document 91/582/FDIS, future edition 6 of IEC 60068-2-21, prepared by IEC TC 91, Electronics assembly technology, was submitted to the IEC-
13、CENELEC parallel vote and was approved by CENELEC as EN 60068-2-21 on 2006-07-01. This European Standard supersedes EN 60068-2-21:1999. It includes the following significant technical changes with respect to EN 60068-2-21:1999 addition of torque severity for nominal thread diameter of 8 mm in Test U
14、d: torque in accordance with IEC 60252-2 (see Table 5); modification of substrate specification and mounting method describing lead-free solder in Test Ue (see Figure 5 and 8.3.3 et al.); modification of test jig and test condition in Test Ue1: substrate bending test (see Figure 7 et al.); change of
15、 pushing force from 10 N to 5 N in Test Ue3: shear test (see 8.5.3.2). 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) 2007-04-01 latest date by which the national standards c
16、onflicting with the EN have to be withdrawn (dow) 2009-07-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60068-2-21:2006 was approved by CENELEC as a European Standard without any modification. _ EN 60068-2-21:2006 Licensed Copy: sheffieldun sh
17、effieldun, na, Thu Nov 09 08:06:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 CONTENTS 1 Scope.5 2 Normative references .5 3 Test Ua1: tensile 6 3.1 Object .6 3.2 General description .6 3.3 Preconditioning .6 3.4 Initial measurements .6 3.5 Test method 6 3.6 Final measurements7 3.7 Information to
18、be given in the relevant specification 7 4 Test Ua2: thrust8 4.1 Object .8 4.2 General description .8 4.3 Preconditioning .8 4.4 Initial measurements .8 4.5 Test method 8 4.6 Final measurements9 4.7 Information to be given in the relevant specification 9 5 Test Ub: bending9 5.1 Object .9 5.2 General
19、 description .10 5.3 Preconditioning .10 5.4 Initial measurements .10 5.5 Test method 10 5.6 Final measurements12 5.7 Information to be given in the relevant specification 13 6 Test Uc: torsion13 6.1 Object .13 6.2 Preconditioning .13 6.3 Initial measurements .13 6.4 Test method 13 6.5 Final measure
20、ments14 6.6 Information to be given in the relevant specification 14 7 Test Ud: torque 14 7.1 Object .14 7.2 General description .14 7.3 Preconditioning .14 7.4 Initial measurements .14 7.5 Test method 15 7.6 Final measurements15 7.7 Information to be given in the relevant specification 15 EN 60068-
21、2-21:2006 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:06:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 8 Test Ue: robustness of terminations for SMD in the mounted state .16 8.1 Object .16 8.2 General description .16 8.3 Mounting .17 8.4 Initial measurements .18 8.5 Test methods 18 8
22、.6 Final measurements20 8.7 Information to be given in the relevant specification 21 Figure 1 Clamp for the testing of short terminations .12 Figure 2 Sketches showing direction by arrow heads of application of forces Test Ua1: tensile and test Ua2: thrust22 Figure 3 Sketches showing test procedure
23、for test Ub: bending (see 5.5.2.1 and 5.5.2.3) .23 Figure 4 Diagrams showing test procedure for test Uc: torsion test for wire terminations24 Figure 5 Example of substrate for test method Ue1 (also suitable for electrical test).25 Figure 6 Example of substrate for test methods Ue2 and Ue3 (also suit
24、able for electrical test) 25 Figure 7 Bending jig for test Ue126 Figure 8 Example of a push-off test substrate 26 Figure 9 Force test Ue2 pull-off .27 Figure 10 Example of a force application pushing tool for test Ue2 push-off 27 Figure 11 Example of the shear (adhesion) test Ue3.27 Table 1 Applicat
25、ion 5 Table 2 Value of applied force for test Ua1.7 Table 3 Value of applied force for test Ua2.9 Table 4 Value of applied force for test Ub 11 Table 5 Torque severity .15 EN 60068-2-21:2006 Annex ZA (normative) Normative references to international publications with their corresponding European pub
26、lications29 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:06:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 ENVIRONMENTAL TESTING Part 2-21: Tests Test U: Robustness of terminations and integral mounting devices 1 Scope This part of IEC 60068 is applicable to all electrical and electron
27、ic components whose terminations or integral mounting devices are liable to be submitted to stresses during normal assembly or handling operations. Table 1 provides details of the applicable tests. Table 1 Application Test Type Component Mounted/not mounted Ua1 Tensile Leaded devices Not mounted Ua2
28、 Thrust Leaded devices Not mounted Ub Bending Leaded devices Not mounted Uc Torsion Leaded devices Not mounted Ud Torque Threaded stud or screw termination Not mounted Ue1 Bending Surface mounted devices Mounted Ue2 Pull/push Surface mounted devices Mounted Ue3 Shear Surface mounted devices Mounted
29、2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-1:1988, Environm
30、ental testing Part 1: General and guidance Amendment 1 (1992) IEC 60068-2-20:1979, Environmental testing Part 2: Tests Test T: Soldering Amendment 2 (1987) IEC 60068-2-58:2004, Environmental testing Part 2-58: Tests Test Td Test methods for solderability, resistance to dissolution of metallization a
31、nd to soldering heat of surface mounting devices (SMD) IEC 60068-2-61:1991, Environmental testing Part 2: Tests Test Z/ABDM: Climatic sequence IEC 61249-2-7:2002, Materials for printed boards and other interconnecting structures Part 2-7: Reinforced base materials clad and unclad Epoxide woven E-gla
32、ss laminated sheet of defined flammability (vertical burning test), copper-clad IEC 61188-5 (all parts), Printed boards and printed board assemblies Design and use IEC 61190-1-2:2002, Attachment materials for electronic assembly Part 1-2: Requirements for soldering pastes for high quality interconne
33、ctions in electronics assembly EN 60068-2-21:2006 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:06:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 6 IEC 61191-2:1998, Printed board assemblies Part 2: Sectional specification Requirements for surface mount soldered assemblies ISO 272:1982, F
34、asteners Hexagon products Widths across flats ISO 9453:1990, Soft solder alloys Chemical compositions and forms 3 Test Ua1: tensile This test is applicable to all types of terminations. 3.1 Object The purpose of this test is to verify that the terminations and attachment of the terminations to the b
35、ody of the component will withstand such axial stresses as are likely to be applied during normal assembly or handling operations. 3.2 General description With the termination in its normal position and the component held by its body, a force is applied to the termination in the direction of its axi
36、s and acting in a direction away from the body of the component. The force shall be applied progressively (without any shock) and then maintained for a period of 10 s 1 s. 3.3 Preconditioning The method of preconditioning shall be as prescribed in the relevant specification. 3.4 Initial measurements
37、 The specimen shall be visually inspected and electrically and mechanically checked, as required by the relevant specification. 3.5 Test method Unless otherwise specified in the relevant specification, the test method shall be as follows: Refer to Figure 2a. 3.5.1 Application This test applies to al
38、l types of terminations. It shall be carried out on all the terminations, except where a component has more than three terminations, in which case the specification shall state the number of terminations per component to be tested. The test shall be carried out in such a manner that all the terminat
39、ions of the component have an equal probability of being subjected to test. 3.5.2 Procedure With the termination in its normal position and the component held by its body, a force with a value as stated in Table 2 shall be applied to the termination in the direction of its axis and acting in a direc
40、tion away from the body of the component. The force shall be applied progressively (without any shock) and then maintained for a period of 10 s 1 s. EN 60068-2-21:2006 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:06:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 7 The value of the applie
41、d force is as follows: a) Wire terminations (circular section or strip) or pins The value of the force applied shall be that indicated in Table 2. Insulated wires shall be stripped of the insulation at the point at which the load is applied. Stranded wires shall be united mechanically at the point o
42、f application of the load (such as by soldering or knotting), prior to the application of the load. Where the technical features of insulated or stranded wires may give rise to difficulties during the stripping, joining or knotting operations and be liable to cause dispute for the test results, such
43、 operations shall be in accordance with the relevant specification or, where necessary, with the instructions of the component manufacturer. Table 2 Value of applied force for test Ua1 Nominal cross-sectional area (S)a mm2 Corresponding diameter (d) for circular-section wires mm Force with tolerance
44、 of 10 % N s 0,05 d 0,25 1 0,05 1,20 d 1,25 40 a For circular-section wires, strips or pins, the nominal cross-sectional area is equal to the value calculated from the nominal dimension(s) given in the relevant specification. For stranded wires, the nominal cross- sectional area is obtained by takin
45、g the sum of the cross-sectional areas of the individual strands of the conductor specified in the relevant specification. b) Other terminations (tag terminations, threaded studs, screws, terminals, etc.) The value of the force to be applied shall be given in the relevant specification. 3.6 Final me
46、asurements The specimen shall be visually inspected and electrically and mechanically checked, as required by the relevant specification. 3.7 Information to be given in the relevant specification Subclause a) Method of preconditioning 3.3 b) Initial measurements 3.4 c) Number of terminations to be t
47、ested, if more than three 3.5.1 d) Force (for oversized and other terminations) 3.5.2 e) Details of stripping, joining or knotting operations, if necessary 3.5.2 f) Final measurements 3.6 EN 60068-2-21:2006 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:06:23 GMT+00:00 2006, Uncontrolled
48、Copy, (c) BSI 8 4 Test Ua2: thrust 4.1 Object The purpose of this test is to verify that the terminations and attachment of the terminations to the body of the component will withstand such thrusts as are likely to be applied during normal assembly or handling operations. This test applies only to s
49、pecimens of small dimensions and of low mass, to the exclusion of equipment and assemblies. NOTE This test does not apply to flexible terminations. The tests for flexible terminations are given in a) and b) of 5.1. 4.2 General description With the termination in its normal position and the component held by its body, thrust is