EN 60512-11-8-1999 en Electromechanical components for electronic equipment Basic testing procedures and measuring methods Part 11 Climatic tests Section 8 Test 11h - Sand and dust.pdf

1、BRITISH STANDARD BS EN 60512-11-8: 1999 IEC 60512-11-8: 1995 Electromechanical components for electronic equipment Basic testing procedures and measuring methods Part 11: Climatic tests Section 8: Test 11h Sand and dust The European Standard EN 60512-11-8:1999 has the status of a British Standard IC

2、S 31.220.01BSEN60512-11-8:1999 This British Standard, having been prepared under the directionof the Electrotechnical Sector Committee, was publishedunder the authorityofthe Standards Committee and comes into effect on 15April1999 BSI 02-2000 ISBN 0 580 32150 9 National foreword This British Standar

3、d is the English language version of EN60512-11-8:1999. It is identical with IEC60512-11-8:1995. The UK participation in its preparation was entrusted by Technical Committee EPL/48, Electromechanical components for electronic equipment, to Subcommittee EPL/48/2, Connectors for electronic equipment,

4、which has the responsibility to: 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

5、them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From1January1997, all IEC publications have the number60000 added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change o

6、ver 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 standards normally include an annex which lists normative references to international publications with their corresponding Europea

7、n publications. The British Standards which implement these international or European publications 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. A Briti

8、sh 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 British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front

9、 cover, an inside front cover, pages i and ii, theENtitle page, pages 2 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issue

10、d since publication Amd. No. Date CommentsBSEN60512-11-8:1999 BSI 02-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 60512-11-8 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60512-11-8 January 1999 ICS 19.080; 31.220.01 Descriptors: Electromechanical c

11、omponents, electronic equipment, measuring methods, sand and dust English version Electromechanical components for electronic equipment Basic testing procedures and measuring methods Part11: Climatic tests Section 8: Test11h Sand and dust (IEC 60512-11-8:1995) Composants lectromcaniques pour quipeme

12、nts lectroniques Procdures dessai de base et mthodes de mesure Partie11: Essais climatiques Section 8: Essai 11h Sable et poussire (CEI 60512-11-8:1995) Elektrisch-mechanische Bauelemente fr elektronische Einrichtungen Me- und Prfverfahren Teil 11: Klimatische Prfungen Hauptabschnitt 8: Prfung 11h S

13、and und Staub (IEC 60512-11-8:1995) This European Standard was approved by CENELEC on1999-01-01. CENELEC members are bound 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

14、-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 Standard exists in three official versions (English, French, German). A version in any other language made by translation

15、 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 national electrotechnical committees of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Icelan

16、d, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Sta

17、ssart 35, B-1050 Brussels 1999 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60512-11-8:1999 EEN60512-11-8:1999 BSI 02-2000 2 Foreword The text of the International Standard IEC60512-11-8:1995, prepared by SC48B, Connectors, of IE

18、C TC48, Electromechanical components and mechanical structures for electronic equipment, was submitted to the formal vote and was approved by CENELEC as EN60512-11-8 on1999-01-01 without any modification. The following dates were fixed: This standard is to be used in conjunction with EN60512-1:1994.

19、 Annexes designated “normative” are part of the body of the standard. In this standard,Annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC60512-11-8:1995 was approved by CENELEC as a European Standard without any modification. Cont

20、ents Page Foreword 2 1 General 3 1.1 Scope and object 3 1.2 Normative reference 3 2 Preparation of specimens 3 3 Test method 3 3.1 Initial measurements 3 3.2 Conditioning 3 3.2.1 Test equipment 3 3.2.2 Positions of the specimens in the test chamber 4 3.2.3 Test procedure 4 3.2.4 Recovery 4 3.3 Final

21、 measurements and requirements 4 4 Details to be specified 4 Annex ZA (normative) Normative references to international publications with their corresponding European publications Inside back cover latest date by which the ENhas to be implemented at national level by publication of an identical nati

22、onal standard or by endorsement (dop) 2000-01-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2000-01-01EN60512-11-8:1999 BSI 02-2000 3 1 General 1.1 Scope and object This section of IEC512-11 defines a standard test method to assess the ability of a

23、 connector to withstand driving fine sand and dust. 1.2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this section of IEC512-11. At the time of publication, the edition indicated was valid. All normative docum

24、ents are subject to revision, and parties to agreements based on this section of IEC512-11 are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and ISO maintain registers of currently valid International Standards

25、. IEC 512-7:1993, Electromechanical components for electronic equipment; basic testing procedures and measuring methods Part 7: Mechanical operating tests and sealing tests. 2 Preparation of specimens The specimens shall be equipped with their normal accessories mounted and wired according to the de

26、tail specification. When the detail specification requires it, the specimens shall be mated and unmated as many times as specified, prior to the test. The test shall be performed on mated connectors or on unmated connectors with protective covers. 3 Test method 3.1 Initial measurements Initial measu

27、rements shall be made as specified by the detail specification. The specimen shall be subjected to test13a: Engaging and separating forces, of IEC512-7. (See also IEC68-2-68: Test L: Dust and sand.) 3.2 Conditioning 3.2.1 Test equipment The test chamber length, section and configuration shall be so

28、designed as to: avoid turbulent flows ahead of the test specimens and limit such flows as much as possible behind them; provide uniform distribution of solid particles within the airstream. The climatic test chamber shall be provided with control devices for maintaining the following within specifie

29、d limits throughout the test: jet density (opacity-measuring photoelectric cell systems are recommended); airflow speed; relative humidity and temperature around the specimen. The sand and dust used for the test shall be abrasives with the following characteristics. The particles shall contain betwe

30、en97% and99% SiO 2 . Smaller than 1504m 100% to 99% by weight Smaller than 1054m 86% to 76% by weight Smaller than 754m 70% to 60% by weight Smaller than 404m 46% to 35% by weight Smaller than 204m 30% to 20% by weight Smaller than 104m 19% to 11% by weight Smaller than 54m 11% to 5% by weight Small

31、er than 24m 5% to 1,5% by weightEN60512-11-8:1999 4 BSI 02-2000 3.2.2 Positions of the specimens in the test chamber The number of positions and the orientation of specimens with respect to the airflow shall be as specified by the detail specification. 3.2.3 Test procedure The detail specification s

32、hall define the number of cycles to be performed. Each cycle lasts2h and consists of four steps. a) Within30min, the test chamber shall be stabilised within the following limits: temperature: (30 3) C; relative humidity25%; air speed: the detail specification shall define a speed from3m/s to10m/s. T

33、he recommended speed is(3,0 0,3)m/s; concentration of the particles:(5 1,5)g/m 3 . b) The above conditions are maintained for30min. c) Within30min, the temperature shall be brought to(65 5) C, the other parameters remaining unchanged. d) The new conditions shall be maintained for1h. Unless otherwise

34、 specified, one cycle shall be performed for each position. Between two successive cycles, the temperature shall be reduced to(30 3) C within2h maximum. 3.2.4 Recovery After the test and to prevent the effects of moisture, dust shall be removed from the mated specimens by shaking, wiping or brushing

35、 but no blower or suction devices shall be used to remove dust that has ingressed into specimens. The specimens shall be allowed to recover as long as required for them to reach room temperature. 3.3 Final measurements and requirements (if applicable) Final measurements shall be made as specified by

36、 the detail specification. The specimens shall be subjected to test13a: Engaging and separating forces, recording the value of the first unmating. 4 Details to be specified Method of mounting and description of wiring of specimens Condition of specimens: mated or unmated with protective covers Numbe

37、r of positions and specimen orientation Requirements for the initial and final measurements Air speed Number of cycles Any deviation from the standard test procedure.EN60512-11-8:1999 BSI 02-2000 Annex ZA (normative) Normative references to international publications with their corresponding Europea

38、n 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 and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of a

39、ny 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 (including amendments). NOTEWhen an international publication has been modified by common modifications, in

40、dicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60512-7 1993 Electromechanical components for electronic equipment Basic testing procedures and measuring methods Part 7: Mechanical operating tests and sealing tests BS EN 60512-11-8: 1999 IEC 60512-11-8: 1995 BSI 3

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