1、BRITISH STANDARD AEROSPACE SERIES BS EN 2591-303:1998 Elements of electrical and optical connection Test methods Part 303: Cold/low pressure and damp heat The European Standard EN2591-303:1997 has the status of a British Standard ICS 49.060BSEN2591-303:1998 This British Standard, having been prepare
2、d under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15January1998 BSI 04-1999 ISBN 0 580 29474 9 National foreword This British Standard is the English language version of EN2591-303:1997. The UK participation in it
3、s preparation was entrusted by Technical Committee ACE/6, Aerospace avionic, electrical and fibre optic technology, to Subcommittee ACE/6/3, Aerospace connectors, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any en
4、quiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references At
5、tention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the
6、BSI Standards Catalogue under the section entitled “International 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 resp
7、onsible 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 cover, an inside front cover, pages i and ii, theENtitle page, pages 2to5, and a back cover. This standard has been up
8、dated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN2591-303:1998 BSI 04-1999 i Contents Page National foreword Inside front cover Foreword 2 Text o
9、f EN 2591:303 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2591-303 October 1997 ICS 49.060 Descriptors: Aircraft industry, aircraft equipment, connecting equipment, test English version Aerospace series Elements of electrical and optical connection Test methods Part 303: Cold/low p
10、ressure,and damp heat Srie arospatiale Organes de connexion lectrique et optique Mthodes dessais Partie 303: Froid/basse pression et chaleur humide Luft und Raumfahrt Elektrische und optische Verbindungselemente Prfverfahren Teil 303: Klte/niedriger Luftdruck und feuchte Wrme This European Standard
11、was approved by CEN on 22June1997. CEN 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-to-date lists and bibliographical references concerning such nati
12、onal standards may be obtained on application to the Central Secretariat or to any CEN 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 CEN member into its own language and no
13、tified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland
14、and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No.
15、 EN 2591-303:1997 EEN2591-303:1997 BSI 04-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the Na
16、tional Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April1998, and conflicting nationa
17、l standards shall be withdrawn at the latest by April1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Ice
18、land, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Preparation of specimens 3 4 Method 3 5 Requirement 5 Figure 1 Test sequence 4 Figure 2 Test sequence 4EN2591-303:1997 BSI
19、 04-1999 3 1 Scope This standard specifies a method (cold/low pressure and damp heat) to verify the long-term stability of elements of connection exposed to ionisation phenomena. It shall be used in conjunction with EN2591. 2 Normative references This European Standard incorporates by dated or undat
20、ed 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 any of these publications apply to this European Standard only when in
21、corporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 2591, Aerospace series Elements of electrical and optical connection Test methods General. EN 2591-206, Aerospace series Elements of electrical and optical connection Test
22、methods Part 206: Measurement of insulation resistance. 3 Preparation of specimens 3.1 The specimens shall be prepared according to the technical specification. If the rear face of the specimens requires protection (e.g. rear face of an hermetic connector) the protective device shall meet the requir
23、ements of the technical specification. If applicable, the test shall be carried out on mated or unmated specimens. Unmated specimens shall be fitted with protective covers. Unwired cavities shall be fitted with filler plugs. 3.2 Unless specified in the technical specification, the following details
24、shall be stated: specimens mated or unmated (if applicable); mounting method, type of cable, position and definition of specimen wiring; measurement method for test EN2591-206; initial measurements and requirements (if applicable); minimum temperature; number of cycles; insulation resistance value.
25、4 Method 4.1 Climatic preconditioning The specimens shall be placed in a test chamber the temperature of which shall be raised to 70 C within2h and maintained for 20h to remove any trace of moisture. The temperature shall then be reduced to 40 C within 2h. 4.2 Initial measurements (if applicable) Th
26、ey shall be carried out as specified while the specimens are in the test chamber in the specified position. 4.3 Procedure Method A: single chamber (seeFigure 1) Method B: two chambers (seeFigure 2) Throughout the test, a 300V d.c. potential shall be applied between the two groups of contacts and a l
27、eakage current monitoring system shall be provided. Leakage current shall not exceed 2mA between the two groups of contacts. 4.3.1 Method A After preconditioning, ambient conditions shall be restored to(23 5)C, with a relative humidity of40% to60% within 2h and maintained for 1h. Within 16h, the tem
28、perature, shall be reduced to the minimum of the specified climatic category. The pressure shall be reduced to a value of(5,5 0,1)kPa corresponding to an altitude of approximately20000m. This pressure and the minimum temperature shall be maintained for4h. Ambient pressure shall then be restored and
29、the temperature raised to(40 2)C within5h. The relative humidity shall be adjusted so that its value is ()% when 40 C temperature is reached. This temperature and humidity shall be maintained for 16h. This constitutes one cycle. The number of cycles shall be as specified. 4.3.2 Method B This procedu
30、re shall apply only when the equipment described for method A is not available. The first chamber shall be used for dry heat, cold and low pressure; the second chamber for damp heat. The specimens shall be transferred from the first to the second chamber only when ambient conditions are reached in t
31、he cycle. The transfer shall take place in less than 1h (seeFigure 2). 952 +3 EN2591-303:1997 4 BSI 04-1999 Figure 1 Test sequence Figure 2 Test sequenceEN2591-303:1997 BSI 04-1999 5 This constitutes one cycle. The number of cycles shall be as specified. 5 Requirement During the last hour of the las
32、t cycle, the insulation resistance shall be measured (EN2591-206). Its value shall not be smaller than the specified value.BS EN 2591-303:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It p
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