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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 EN 2591-303:1997 has the status of a British Standard ICS 49.060 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:
2、00:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2591-303:1998 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1998 BSI 04-1999 ISBN 0 580 29474 9 Natio
3、nal foreword This British Standard is the English language version of EN 2591-303:1997. The UK participation in its 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 responsib
4、ility 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 them in the UK. A list
5、of organizations represented on this subcommittee can be obtained on request to its secretary. 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 European pub
6、lications. 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 British St
7、andard 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 cove
8、r, an inside front cover, pages i and ii, the EN title page, pages 2 to 5, 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 issued since publication Amd.
9、 No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:00:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2591-303:1998 BSI 04-1999i Contents Page National forewordInside front cover Foreword2 Text of EN 2591:3033 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:00:4
10、7 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:00:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2591-303 October 1997 ICS 49.060 Descriptors: Aircraft industry, aircraft equipment, c
11、onnecting equipment, test English version Aerospace series Elements of electrical and optical connection Test methods Part 303: Cold/low pressure, and damp heat Srie arospatiale Organes de connexion lectrique et optique Mthodes dessais Partie 303: Froid/basse pression et chaleur humide Luft und Raum
12、fahrt Elektrische und optische Verbindungselemente Prfverfahren Teil 303: Klte/niedriger Luftdruck und feuchte Wrme This European Standard was approved by CEN on 22 June 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Eur
13、opean 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 CEN member. This European Standard exists in three official versions (Englis
14、h, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republ
15、ic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stass
16、art 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. EN 2591-303:1997 E Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:00:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2591-303:1997 BSI 04-1999 2
17、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 National Associations and the Official Services of
18、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 April 1998, and conflicting national standards shall be withdrawn at the latest by
19、April 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,
20、 Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Preparation of specimens3 4Method3 5Requirement5 Figure 1 Test sequence4 Figure 2 Test sequence4 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:00:47 GMT+00:00 200
21、6, Uncontrolled Copy, (c) BSI EN 2591-303:1997 BSI 04-19993 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 EN 2591. 2 Normative references Thi
22、s 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 any of these publica
23、tions 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. EN 2591, Aerospace series Elements of electrical and optical connection Test methods General. EN 2591-206, Aerospace series E
24、lements of electrical and optical connection Test 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 conn
25、ector) the protective device shall meet the requirements 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 t
26、he technical specification, the following details shall be stated: specimens mated or unmated (if applicable); mounting method, type of cable, position and definition of specimen wiring; measurement method for test EN 2591-206; initial measurements and requirements (if applicable); minimum temperatu
27、re; number of cycles; insulation resistance value. 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 within 2 h and maintained for 20 h to remove any trace of moisture. The temperature shall then be reduced to 40 C
28、within 2 h. 4.2 Initial measurements (if applicable) They 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 (see Figure 1) Method B: two chambers (see Figure 2) Throughout the test, a 300 V d.c. potential s
29、hall be applied between the two groups of contacts and a leakage current monitoring system shall be provided. Leakage current shall not exceed 2 mA 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 of
30、40 % to 60 % within 2 h and maintained for 1 h. Within 16 h, the temperature, 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 approximately 20 000 m. This pressure and the minimum temperatur
31、e shall be maintained for 4 h. Ambient pressure shall then be restored and the temperature raised to (40 2) C within 5 h. 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 16 h. This constitutes o
32、ne cycle. The number of cycles shall be as specified. 4.3.2 Method B This procedure 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 f
33、rom the first to the second chamber only when ambient conditions are reached in the cycle. The transfer shall take place in less than 1 h (see Figure 2). 95 2+ 3 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:00:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2591-303:1997 4 BSI 04-1999
34、Figure 1 Test sequence Figure 2 Test sequence Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:00:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2591-303:1997 BSI 04-19995 This constitutes one cycle. The number of cycles shall be as specified. 5 Requirement During the last hour of the las
35、t cycle, the insulation resistance shall be measured (EN 2591-206). Its value shall not be smaller than the specified value. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:00:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2591-303:1998 BSI 389 Chiswick High Road London W4 4AL BSI Bri
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