1、BRITISH STANDARDBS EN 60068-2-21: 2006Environmental testing Part 2-21: Tests Test U: Robustness of terminations and integral mounting devicesICS 19.040; 31.190nullnull nullnullnullnullnullnullnull nullnullnullnullnullnullnull nullnullnull nullnullnullnullnullnullnullnullnullnull nullnullnullnullnull
2、null nullnull nullnullnullnullnullnullnullnullnull nullnull nullnullnullnullnullnullnullnullnull nullnullnullIncorporating Corrigendum January 2012National forewordThis British Standard is the UK implementation of EN 60068-2-21:2006. It is identical to IEC 60068-2-21:2006, incorporating corrigendum
3、January 2012. It supersedes BS EN 60068-2-21:1999 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee EPL/501, Electronic assembly technology.A list of organizations represented on the committee can be obtained on request to its secretary.This publication
4、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.BS EN 60068-2-21:2006This British Standard was published under the authority of the Standards Pol
5、icy and Strategy Committee on 31 October 2006 The British Standards Institution 2012. Published by BSI Standards Limited 2012.Amendments/corrigenda issued since publicationDate Comments 30 April 2012 Implementation of IEC corrigendum January 2012. Reference to Table 3 has been amended to Table 4 in
6、Clause 5.5.2.1.ISBN 978 0 580 78273 2EUROPEAN STANDARD EN 60068-2-21NORME EUROPENNE EUROPISCHE NORM July 2006 C E N E L E C European Committee for Electrotechnical StandardizationComit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung C en t r a l S e c r et
7、a r ia t : r u e d e St a s s a rt 3 5 , B - 1 05 0 Br u s s e ls 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 EICS 19.040; 31.190 Supersedes EN 60068-2-21:1999English version Environmental testing Part 2-21
8、: 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 60068-2-21:2006)UwTeil 2-21: Prfungen -Prfung U:Widerstandsfhigkeit derAnschlsse un
9、d integrierterBefestigungsmittel (IEC 60068-2-21:2006)This European Standard was approved by CENELEC on 200 6-07-01. CENELEC members are bound to complyw i t h t h e C E N / C E N E L E C I n t e r n a l R e g u l a t i o n s w h i c h s t i p u l a t e t h e c o n d i t i o n s f o r g i v i n g t
10、h i s E u r o p e a n S t a n d a r d the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member. This European Standard exists in three
11、 official versions (English, French, German). A version in any otherlanguage made by translation under the responsibility of a CENELEC member into its own language and notifiedto the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical c
12、ommittees 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, Switzerland and the United King
13、dom. 2 Foreword The text of document 91/582/FDIS, future edition 6 of IEC 60068-2-21, prepared by IEC TC91,Electronics assembly technology, was submitted to the IEC-CENELEC parallel vote and was approved byCENELEC as EN 60068-2-21 on 2006-07-01. This European Standard supersedesEN 60068-2-21:1999. I
14、t 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 Ud: torque in accordance withIEC 60252-2 (see Table 5); modification of substrate specification and mounting method describing lead-free s
15、older 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 pushing force from 10 N to 5 N in Test Ue3:shear test (se 8.53.2). The following dates were fixed: latest date by which the EN has to be i
16、mplemented at national level by publication of an identical national standard or by endorsement (dop) 2007-04-01 latest date by which the national standards conflictingwith the EN have to be withdrawn (dow) 2009-07-01 Annex ZA has been added by CENELEC. _ Endorsement noticeThe textofthe Internationa
17、lStandard IEC 60068-2-21:2006 was approved by CENELEC asa European Standard without any modification. _ BS EN 60068-2-21:2006 EN 60068-2-21:2006 (E) 3 CONTENTS1 S c o p e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Nrmativ frencs 53TsU1: tensile63.1 Object.63.2 General description.63.3 Preconditioning.63.4 Initial measurements.63.5 Test method63.6 Final measurements73.7 Information to
19、be givenin the relevant specification74U2: thrust84.1 Object.84.2 General description.84.3 Preconditioning.84.4 Initial measurements.84.5 Test method84.6 Final measurements94.7 Information to be givenin the relevant specification9Ub: .95.1 Object.95.2 General description.105.3 Preconditioning.105.4
20、Initial measurements.105.5 Test method105.6 Final measurements125.7 Information to be givenin the relevant specification13Uc: 36.1 Object.136.2 Preconditioning.136.3 Initial measurements.136.4 Test method136.5 Final measurements146.6 Information to be givenin the relevant specification147Ud:q 47.1 O
21、bject.147.2 General description.147.3 Preconditioning.147.4 Initial measurements.147.5 Test method157.6 Final measurements157.7 Information to be givenin the relevant specification15BS EN 60068-2-21:2006 EN 60068-2-21:2006 (E) 4 8Test U:robustne ofrminatosfrSMDinthemoud stae.168.1 Object.168.2 Gener
22、al description.168.3 Mounting.178.4 Initial measurements.188.5 Test methods188.6 Final measurements208.7 Information to be givenin the relevant specification21Figure 1 Clamp for the testing ofshort terminations.12Figure 2 Sketches showingdirection byarrowheads ofapplication of forcesTest Ua1: tensil
23、e and test Ua2: thrust22Figure3 Sketches showing test procedure for testUb: bending (see 5.5.2.1 and 5.5.2.3).23Figure4 Diagramsshowing test procedure fortestUc: torsion test for wire terminations24Figure 5 Example of substrate fortest method Ue1 (also suitable forelectrical test).25Figure6 Example
24、ofsubstratefor testmethods Ue2and Ue3(also suitable forelectrical test)25Figure 7 Bending jig for test Ue126Figure8 Example ofa push-off test substrate26Figure9 Force test Ue2 pull-off.27Figure 10 Example ofa force application pushingtool fortestUe2push-off27Figure 11 Example of the shear (adhesion)
25、 test Ue3.27Table 1 Application5Table 2 Value of appliedforce for test Ua1.7Table 3 Value of appliedforce for test Ua2.9Table4 Value of applied force fortest Ub11Table 5 Torque severity.15Annex ZA (normative) Normative references to international publications with theircorresponding European publica
26、tions29BS EN 60068-2-21:2006 EN 60068-2-21:2006 (E) 5 ENVIRONMENTAL TESTING Part 2-21: Tests Test U:Robustness ofterminations and integral mounting devices 1 Scope This partof IEC60068 is applicableto all electricalandelectronic components whoseterminations or integral mounting devicesare liable tob
27、e submitted to stresses during normalassembly or handling operations.Table1provides details ofthe applicable tests.Table 1 ApplicationTest Type Component Mounted/notmounted Ua1nilLdvNUa2hrusUb Bending Leaded devices Notmounted Uc Torsion Leaded devices Notmounted Ud Torque Threaded stud or screw ter
28、mination Not mounted Ue1Bending Surface mounted devices Mounted Ue2Pull/push Surface mounted devices Mounted Ue3Shear Surface mounted devices Mounted 2 NormativereferencesThe following referenced documents are indispensable fortheapplication ofthis document.For dated references,onlythe edition cited
29、 applies. For undated references,thelatesteditionofthe referenced document(including any amendments) applies.IEC 60068-1:1988, Environmental testing Part1: Generaland guidanceAmendment 1 (1992)IEC 60068-2-20:1979,Environmental testingPart2: Tests Test T:Soldering Amendment 2 (1987)IEC 60068-2-58:200
30、4, Environmental testing Part2-58: Tests TestTd Test methods forsolderability, resistance to dissolution of metallization and to soldering heat of surfacemounting devices(SMD)IEC 60068-2-61:1991, Environmental testing Part2: Tests Test Z/ABDM: Climatic sequence IEC 61249-2-7:2002, Materials for prin
31、ted boards and other interconnecting structures Part2-7: Reinforced base materials clad and unclad Epoxide woven E-glass laminated sheetof defined flammability (vertical burning test), copper-cladIEC 61188-5(all parts),Printed boards andprinted board assemblies Designand useIEC 61190-1-2:2002, Attac
32、hment materials for electronic assembly Part1-2: Requirements forsoldering pastes for highquality interconnections in electronicsassembly BS EN 60068-2-21:2006 EN 60068-2-21:2006 (E) 6 IEC 61191-2:1998,Printed board assemblies Part 2:Sectional specificationRequirementsfor surfacemount solderedassemb
33、liesISO 272:1982,FastenersHexagon products Widths across flatsISO 9453:1990,Soft solderalloys Chemical compositionsand forms 3 TestUa1: tensileThis test isapplicable to all types ofterminations. 3.1 ObjectThe purpose of this testis to verifythat the terminationsand attachment ofthe terminations toth
34、e body ofthe component will withstand suchaxialstresses asare likely to be applied duringnormal assembly orhandling operations.3.2 General description With the termination in its normal position and the component held byits body, a force isapplied to the termination in the direction of its axisand a
35、cting in a direction awayfromthe bodyof the component.The force shall be applied progressively (withoutany shock) and thenmaintained foraperiod of 10 s 1 s.3.3 Preconditioning The method ofpreconditioning shall beas prescribed in the relevant specification.3.4 Initial measurementsThe specimen shallb
36、e visuallyinspected and electricallyand mechanically checked, asrequired by the relevant specification.3.5 TestmethodUnlessotherwise specifiedin the relevant specification,the test method shall beas follows:Refer to Figure2a.3.5.1 ApplicationThistest applies to all types ofterminations.It shall beca
37、rriedout on all the terminations,except where acomponent hasmore than three terminations, in which case the specificationshall state the numberof terminationsper componenttobetested. The test shall be carried out in such a manner thatall the terminationsof the componenthave an equal probabilityofbei
38、ng subjected to test. 3.5.2 Procedure With the termination in itsnormal position and the component held by its body,a force with avalue asstated inTable2shallbe applied tothe termination inthe direction of its axis and acting in a direction away from the body of the component. The force shall be app
39、lied progressively(without anyshock) and then maintained foraperiodof10 s 1 s.BS EN 60068-2-21:2006 EN 60068-2-21:2006 (E) 7 The value of the applied force is asfollows: a) Wire terminations (circular section or strip)orpinsThe value of theforce appliedshall be that indicated inTable 2.Insulated wir
40、es shall be stripped of the insulation atthe point at which the load is applied.Stranded wires shall be united mechanically atthe pointof application ofthe load(such asby soldering or knotting), prior to the application of the load. Where the technical featuresof insulated orstranded wiresmay give r
41、iseto difficulties during the stripping, joining orknotting operationsand beliable to causedispute forthe test results, such operationsshall be in accordance with the relevantspecification or, where necessary, with theinstructionsof the component manufacturer.Table2 Value ofapplied force for test Ua
42、1Nominal cross-sectionalarea (S )amm2Corresponding diameter (d ) for circular-section wires mmForce with tolerance of 10 %Ns 0,05 d 0,25 1 0,05 1,20 d 1,25 40 aFor circular-section wires, strips or pins, the nominal cross-sectionalarea is equal to the value calculated from the nominal dimension(s) g
43、iven in the relevant specification. For stranded wires, the nominal cross-sectional area is obtained by taking the sum of the cross-sectionalareas of the individual strands of theconductor specified in the relevant specification.b) Other terminations (tagterminations,threaded studs, screws, terminal
44、s, etc.)The value of the forceto be applied shall be givenintherelevant specification.3.6 Finalmeasurements The specimen shallbe visuallyinspected and electricallyand mechanically checked, asrequired by the relevant specification.3.7 Information to begiveninthe relevant specificationSuba) Method of
45、preconditioning 3.3 b) Initial measurements 3.4 c) Number ofterminationsto be tested, ifmorethan three 3.5.1 d) Force (for oversized and other terminations) 3.5.2 e) Details of stripping, joining or knotting operations,ifnecessary 3.5.2 f) Finalmeasurements 3.6 BS EN 60068-2-21:2006 EN 60068-2-21:20
46、06 (E) 8 4 TestUa2: thrust4.1 ObjectThe purpose of this testis to verifythat the terminationsand attachment ofthe terminations tothe body ofthe component will withstand such thrustsas are likely to be applied duringnormal assembly or handling operations. This test applies only to specimens of small
47、dimensionsandof low mass, to the exclusion ofequipment 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 Withthe termination in itsnormalposition and thecomponent held by itsbody, thrust isa
48、pplied to the termination as close as possible to the bodyofthe component, but leaving aclear2mm of wire between the bodyof the componentand the nearest point of the deviceapplying the force. Theforce shallbe applied progressively (withoutanyshock) andthen maintained foraperiod of 10 s 1 s.4.3 Preco
49、nditioning The method ofpreconditioning shall beas prescribed in the relevant specification.4.4 Initial measurementsThe specimen shallbe visuallyinspected and electricallyand mechanically checked, asrequired by the relevant specification.4.5 Testmethod Refer to Figure2b.4.5.1 ApplicationThe relevant specification shall statewhetherthis test isapplicable.When applicable, it shallbe carried out on all the terminations, except where a component has more than th
