1、BRITISH STANDARD AEROSPACE SERIES BS EN 2591-304:1998 Elements of electrical and optical connection Test methods Part 304: Damp heat steady state The European Standard EN 2591-304:1997 has the status of a British Standard ICS 49.060BSEN 2591-304:1998 This British Standard, having been prepared under
2、 the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes into effect on 15 January 1998 BSI 04-1999 ISBN 0 580 29484 6 National foreword This British Standard is the English language version of EN 2591-304:1997. The UK participation in its prepa
3、ration 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 enquiries
4、 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 Attention
5、 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 international or European publications referred to in this document may
6、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 Standard does not purport to include all the necessary provisions of a contract. Users of British St
7、andards 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 cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 4 and a back cover. This st
8、andard 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. No. Date CommentsBSEN2591-304:1998 BSI 04-1999 i Contents Page National foreword Inside front cover
9、 Foreword 2 Text of EN 2591-304 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2591-304 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 Pa
10、rt 304: Damp heat steady state Srie arospatiale Organes de connexion lectrique et optique Mthodes dessais Partie 304: Essai continu de chaleur humide Luft- und Raumfahrt Elektrische und optische Verbindungselemente Prfverfahren Teil 304: Dauerprfung bei feuchter Wrme This European Standard was appro
11、ved 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 European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national st
12、andards 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 notified
13、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 and Uni
14、ted 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. EN 259
15、1-304:1997 EEN2591-304:1997 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 National
16、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 April 1998, and conflicting national stan
17、dards shall be withdrawn at the latest by 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, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland,
18、 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 Apparatus 3 5 Method 3EN2591-304:1997 BSI 04-1999 3 1 Scope This standard specifies a method of as
19、sessing the ability of elements of connection to be stored and to function under conditions of steady state damp heat. It shall be used together with EN 2591. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative
20、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 incorporated in it by amendment or revision. For undated references
21、 the latest edition of the publication referred to applies. EN 2591, Aerospace series Elements of electrical and optical connection Test methods General. EN 2591-101, Aerospace series Elements of electrical and optical connection Test methods Part 101: Visual examination. EN 2591-201, Aerospace seri
22、es Elements of electrical and optical connection Test methods Part 201: Contact resistance Low level. EN 2591-202, Aerospace series Elements of electrical and optical connection Test methods Part 202: Contact resistance at rated current. EN 2591-206, Aerospace series Elements of electrical and optic
23、al connection Test methods Part 206: Measurement of insulation resistance. EN 2591-207, Aerospace series Elements of electrical and optical connection Test methods Part 207: Voltage proof test. EN 2591-408, Aerospace series Elements of electrical and optical connection Test methods Part 408: Mating
24、and unmating forces 1) . 3 Preparation of specimens 3.1 Specimens shall be prepared according to the technical specification. 3.2 Unless specified in the technical specification, the following details shall be stated: specimens mated or unmated (if applicable); mounting method and definition of spec
25、imen wiring; type of cable (if applicable); number of mating and unmating operations prior to testing (if applicable); type of preconditioning; severity (see 5.3.2); value of polarization voltage (if applicable); initial measurements (if applicable); measurements during the test (if applicable); fin
26、al measurements and requirements (if applicable). 4 Apparatus 4.1 The test chamber shall be so designed that: the temperature and humidity of the chamber are controlled by sensing devices located where the specimens are installed; the temperature may be maintained at (40 2) C, and the relative humid
27、ity at (93) % where the specimens are installed; condensed water is continuously drained from the chamber and not reused until it has been purified. When an injection-type chamber is used, the water shall have resistivity greater than 500 7m. 4.2 Precautions shall be taken to ensure that: the condit
28、ions prevailing in the locations where the specimens are installed are uniform and as similar as possible to those prevailing in the immediate vicinity of the sensing devices; the properties or loading of specimens do not appreciably influence conditions within the chamber; no condensed water from t
29、he chamber walls and roof can fall on the specimens. 5 Method 5.1 Climatic preconditioning It shall not be less than 1 h unless otherwise specified. 5.2 Initial measurements (if applicable) They shall be carried out as specified. 5.3 Procedure 5.3.1 The specimens shall be introduced into the test ch
30、amber in the specified condition. Care shall be taken to avoid formation of water droplets on the specimens; this may be done by pre-heating the specimens to the temperature specified for the chamber. 1) Published as AECMA Prestandard at the date of publication of this standard +2 3 EN2591-304:1997
31、4 BSI 04-1999 5.3.2 The specimens shall be subjected to one of the following severities: 21 d or 56 d. unless otherwise specified. 5.3.3 Polarization voltage A polarization voltage shall be continuously applied to two of the specimens during testing. Alternate contacts shall be connected together to
32、 form two groups, one including all even numbered contacts, the second all odd numbered contacts. The test voltage shall be applied: on specimen No. 1: between the first group of contacts and the second group connected to the housing and/or the mounting plate; on specimen No. 2: between the second g
33、roup of contacts and the first group connected to the housing and/or to the mounting plate. In the case of contacts arranged in two or more rows, it may be necessary to form a second arrangement of two groups in order to apply the voltage between all adjacent contacts. 5.4 Recovery The specimens sha
34、ll be allowed to recover to initial conditions. 5.5 Final measurements and requirements (ifapplicable) The specimens shall be subjected to the following test sequence immediately after recovery: EN 2591-206; EN 2591-207; EN 2591-201 or EN 2591-202; EN 2591-408; EN 2591-101. When specified, a test ac
35、cording to EN 2591-206 shall be carried out while the specimens are still in the test chamber. The specimens, if mated, shall not be unmatedpriorto the contact resistance test (EN2591-201 or EN2591-202).5 blankBS EN 2591-304:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitutio
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