1、BRITISH STANDARD BS EN 60068-2-43: 2003 Environmental testing Part 2-43: Tests Test Kd: Hydrogen sulphide test for contacts and connections The European Standard EN 60068-2-43:2003 has the status of a British Standard ICS 31.220.10 BS EN 60068-2-43:2003 This British Standard was published under the
2、authority of the Standards Policy and Strategy Committee on 24 September 2003 BSI 24 September 2003 ISBN 0 580 42668 8 National foreword This British Standard is the official English language version of EN 60068-2-43:2003. It is identical with IEC 60068-2-43:2003. It supersedes BS 2011-2.1Kd:1977 wh
3、ich is withdrawn. The UK participation in its preparation was entrusted by Technical Committee EPL/48, Electromechanical components and mechanical structures for electronic equipment, to Subcommittee EPL/48/2, Connectors, which has the responsibility to: A list of organizations represented on this s
4、ubcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using
5、 the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. 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 does not of itself confer immunity fro
6、m legal obligations. aid enquirers to understand the text; present to the responsible 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
7、UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STA
8、NDARD EN 60068-2-43 NORME EUROPENNE EUROPISCHE NORM September 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC
9、- All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60068-2-43:2003 E ICS 31.220.10 English version Environmental testing Part 2-43: Tests Test Kd: Hydrogen sulphide test for contacts and connections (IEC 60068-2-43:2003) Essais denvironnemen
10、t Partie 2-43: Essais Essai Kd: Essai lhydrogne sulfur pour contacts et connexions (CEI 60068-2-43:2003) Umweltprfungen Teil 2-43: Prfungen Prfung Kd: Hydrogensulfid fr Kontakte und Verbindungen (IEC 60068-2-43:2003) This European Standard was approved by CENELEC on 2003-09-01. CENELEC members are b
11、ound to comply with the CEN/CENELEC Internal Regulations 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
12、 Central Secretariat or to any CENELEC member. This European 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 sa
13、me status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Swi
14、tzerland and United Kingdom. EN 60068-2-43:2003 - 2 - Foreword The text of document 48B/1325/FDIS, future edition 2 of IEC 60068-2-43, prepared by SC 48B, Connectors, of IEC TC 48, Electromechanical components and mechanical structures for electronic equipment, was submitted to the IEC-CENELEC paral
15、lel vote and was approved by CENELEC as EN 60068-2-43 on 2003-09-01. 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) 2004-06-01 latest date by which the national standards con
16、flicting with the EN have to be withdrawn (dow) 2006-09-01 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 CENELEC. _ E
17、ndorsement notice The text of the International Standard IEC 60068-2-43:2003 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60068-1 NOTE Harmonized as EN 60068-1
18、:1994 (not modified). IEC 60068-2-46 NOTE Harmonized as HD 323.2.46 S1:1988 (not modified). _ Page2 EN60068243:200360068-2-43 IEC:2003 3 ENVIRONMENTAL TESTING Part 2-43: Tests Test Kd: Hydrogen sulphide test for contacts and connections 1 Scope and object This test: is intended to provide accelerate
19、d means to assess the effects of the tarnishing of silver and silver alloys used for contacts and connections; is particularly suitable for giving information on a comparative basis; is not suitable as a general corrosion test, i.e. it may not predict the behaviour of contacts and connections in ind
20、ustrial atmospheres. NOTE In view of the limited information to be obtained from accelerated corrosion tests, particular attention should be paid to the guidance on this test given in IEC 60068-2-46. Reference should also be made to IEC 60355. The object of this test is: a) to determine the influenc
21、e of atmospheres containing hydrogen sulphide on the contact properties of contacts made of: silver or silver alloy; silver protected with another layer; other metals covered with silver or silver alloy. b) to check solderless connections made of the same material as in item a) with regard to their
22、tightness or effectiveness. In all tests, the major criterion of performance will be the change in contact resistance caused by exposure to the test atmosphere containing hydrogen sulphide. 2 Normative references The following referenced documents are indispensable for the application of this docume
23、nt. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60512-2-1:2002, Connectors for electronic equipment Tests and measurements Part 2-1: Electrical continuity and contact resistance te
24、sts Test 2a: Contact resistance Millivolt level method 3 Test apparatus The test apparatus consists of a climatic system, test enclosures, a gas delivery system and means for measuring gas concentration, detailed in Annex A. Page3 EN60068243:200360068-2-43 IEC:2003 4 3.1 Test chamber The test chambe
25、r and its auxiliary parts shall be made of materials that do not react with or absorb hydrogen sulphide and which do not influence the corrosive effects of the test atmosphere. The atmosphere shall enter and leave the chamber through tubes with sufficiently large diameters such that the total flow t
26、hrough the chamber is at least three, but not more than five, changes of the atmosphere per hour. The exhaust from the chamber should not be allowed to enter the laboratory. The detailed construction of the chamber including the method of producing the test atmosphere is optional, provided that: a)
27、the conditions in that part of the chamber occupied by the specimens are within the specified limits; b) the specimens under test are protected from direct impingement of the incoming gas flow; c) arrangements are made to move the specimens through the atmosphere at an average rate of 20 m/h to 60 m
28、/h (approximately 6 mm/s to 17 mm/s) or alternatively to gently stir the atmosphere, obtaining a similar relative velocity between atmosphere and specimens; d) condensation does not occur on the inside walls of the test chamber; e) the test chamber is not exposed to direct sunlight and the level of
29、illumination (provided by daylight or by incandescent or fluorescent lamps) measured within the test chamber at the site of any exposed surface is 50 lx to 300 lx. An example of a suitable test chamber is given in Annex A. 4 Test atmosphere The composition of the atmosphere within the test chamber s
30、hall satisfy the following conditions: hydrogen sulphide: 10 10 6to 15 10 6vol/vol (parts per million); temperature: 25 C 2 C; relative humidity: 75 %. The relative humidity shall be held as close as possible to 75 %, but shall in no case exceed 80 % nor fall below 70 %. The test atmosphere may be o
31、btained by mixing hydrogen sulphide (from any convenient source) with air and water vapour in a way to ensure a homogeneous mixture. (More than one stage may be necessary to obtain a homogeneous distribution of the small quantity of hydrogen sulphide.) 5 Preconditioning The specimens under test shal
32、l not be cleaned in any way unless required by the manufacturers instructions, the relevant detail specification, or agreed upon between the interested parties. Page4 EN60068243:200360068-2-43 IEC:2003 5 6 Method 6.1 Initial measurements The relevant specification may require that, before and after
33、test, a resistance measurement be carried out in combination with mechanical tests (e.g. shock or vibration tests). The specimens shall be measured, mechanically checked and subjected to mechanical endurance as required by the relevant specification. The contact resistance shall be measured in accor
34、dance with IEC 60512-2-1, in order to avoid damage to films formed on contact surfaces. 6.2 Procedure Prior to the commencement of the test, it shall be established by suitable measurements that stable conditions for the concentration of hydrogen sulphide, temperature and relative humidity have been
35、 achieved. Periodic checks shall be made during the test to ensure that these conditions are maintained. Care shall be taken that the specimens are placed in a way that they do not come in contact with each other and that they do not cover or shield each other from the test atmosphere. Adequate prec
36、autions shall be taken to ensure that the contacts are not disturbed during the exposure period. Specimens shall be exposed with contacts open and/or closed as required by the relevant detail specification. The specimens shall be exposed without any electrical load or as required by the detail speci
37、fication. The specimens shall be continuously exposed to the test atmosphere for 4, 10 or 21 days as required by the detail specification. 6.3 Final measurements The specimens shall be removed from the chamber and stored under standard recovery conditions for not less than 1 h and not more than 2 h
38、before contact resistance measurements are made. Adequate precautions shall be taken to ensure that the contacts are not disturbed. The method used for measuring the contact resistance should be the same as used for the initial measurement. NOTE If the necessary measurements cannot be made within th
39、e specified time, the period of storage under recovery conditions may be extended to a maximum of 24 h; such an extension shall be mentioned in the report. In general, specimens which are exposed with contacts in the mated condition shall have their contact resistance measured before they are unmate
40、d. Specimens exposed with contacts in the unmated condition shall be mated once and the contact resistance shall then be measured. Page5 EN60068243:200360068-2-43 IEC:2003 6 Treatment of the contacts before final measurements and the details of measurements shall be made as required by the relevant
41、specification. Visual inspection of the specimens may be required by the detail specification. 7 Details to be specified The relevant specification shall specify the following details: a) measurements, checks and mechanical endurance to be made prior to the test; b) if contacts are mated or unmated
42、during the test; c) electrical loading or operational conditions of the specimens, if applicable; d) duration of the test; e) measurements, checks and visual inspection to be made at the end of the test. Page6 EN60068243:200360068-2-43 IEC:2003 7 Annex A (informative) Generation of the conditioning
43、atmosphere As an example, this Annex schematically describes an apparatus suitable for producing the test atmosphere by directly mixing the necessary components. Other apparatus and methods of mixing and control may be used, provided they comply with all the requirements of this specification. The t
44、est apparatus shown in Figure A.1 is composed of an air-conditioning unit, a gas supply with dosing pump, a test cabinet, a gas washing bottle for the removal of H 2 S from the exhaust gases, an air flow meter and a suction pump. Corrosive gas injector Fresh air filter Air conditioning plant Dosing
45、pump Gas supply Pressure-reducing valve Baffle plates Heating and/or cooling device Isolation Gas washing bottle Air flowmetre Suction pump and freezing trap IEC 1638/03Figure A.1 Schematic drawing of apparatus with generation of conditioning atmosphere Page7 EN60068243:2003 - 3 - EN 60068-2-43:2003
46、 Annex ZA (normative) Normative references to international publications with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text an
47、d the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (i
48、ncluding amendments). NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60512-2-1 2002 Connectors for electronic equipment - Tests and measurements Part 2-1: Electrical continuity an
49、d contact resistance tests - Test 2a: Contact resistance - Millivolt level method EN 60512-2-1 2002 9egaP 3002:34286006NEPage8 EN60068243:200360068-2-43 IEC:2003 8 Bibliography IEC 60068-1:1988, Environmental testing Part 1: General and guidance IEC 60068-2-46:1982, Environmental testing Part 2: Tests. Guidance to Test Kd: Hydrogen sulphide test for conta
