1、BRITISH STANDARD AEROSPACE SERIES BS EN 2591-213:1998 Elements of electrical and optical connection Test methods Part 213: Shielding effectiveness from100MHz to 1GHz The European Standard EN2591-213:1997 has the status of a British Standard ICS 49.060BSEN 2591-213:1998 This British Standard, having
2、been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comesintoeffect on 15 January 1998 BSI 04-1999 ISBN 0 580 29488 9 National foreword This British Standard is the English language version of EN2591-213:1997. The UK participat
3、ion in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic, electrical and fibre optic technology, to SubcommitteeACE/6/3, Aerospace connectors, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committe
4、e 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 of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-refer
5、ences 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 publications. The British Standards which implement international or European publications referred to in thi
6、s document 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 Standard does not purport to include all the necessary provisions of a contract. User
7、s 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 cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 4 and a back
8、 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. No. Date CommentsBSEN2591-213:1998 BSI 04-1999 i Contents Page National foreword Ins
9、ide front cover Foreword 2 Text of EN 2591-213 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2591-213 October 1997 ICS49.060 Descriptors: Aerospace industry, aircraft equipment, connecting equipment, test English version Aerospace series Elements of electrical and optical connection
10、Test methods Part 213: Shielding effectiveness from 100MHz to 1GHz Srie arospatiale Organes de connexion lectrique et optique Mthodes dessais Partie 213: Efficacit du blindage de100MHz 1GHz Luft- und Raumfahrt Elektrische und optische Verbindungselemente Prfverfahren Teil 213: Schirmwirkung von100MH
11、z bis1GHz 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 European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographi
12、cal 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 (English, French, German). A version in any other language made by translation under the responsibility of a CEN
13、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, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Po
14、rtugal, Spain, Sweden, Switzerland 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
15、 for CEN national Members. Ref. No. EN 2591-213:1997 EEN2591-213:1997 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
16、has received the approval of the National 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
17、 April 1998, and conflicting national standards 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, Czech Republic, Denmark,
18、 Finland, France, Germany, Greece, Iceland, 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 3 Figure 1 Radiation detecting equ
19、ipment 4 Figure 2 Test setup 4EN2591-213:1997 BSI 04-1999 3 1 Scope This standard specifies a method of measuring the shielding effectiveness from100MHz to1GHz of elements of connection fitted with screen clamping backshells. It shall be used together with EN2591. 2 Normative references This Europea
20、n 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 publications app
21、ly 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. 3 Preparation of specimens 3.1 Two alter
22、natives: the insert shall be removed; or the insert without contacts shall have a suitable hole drilled through its centre. A conductor of suitable geometry to match the inside diameter of the specimens and screen clamping backshells shall be installed inside the specimens to provide a coaxial line
23、with a507 characteristic impedance. Tapered accessories may be used for changing diameters to centre the conductor inside the specimens provided they do not introduce any significant discontinuity in the coaxial line. 3.2 Unless specified in the technical specification, the following details shall b
24、e stated: test frequencies; number of specimens; type of specimens and screen clamping backshells; attenuation; requirement. 4 Apparatus The electromagnetic radiation detecting equipment (seeFigure 1) shall consist of an outer shell constructed to provide a coaxial line with a507 characteristic impe
25、dance with the outside part of the mated specimens, the coupling ring and screen clamping backshells. The voltage standing wave ratio shall not exceed1,5. A sliding circumferential short shall be positioned between the specimen and the generator for tuning the outer coaxial line for maximum signal o
26、utput at each test frequency. The allowable travel of this short shall be greater than a half wave length at the lowest test frequency, i.e.approximately1,6m for a100MHz frequency. The inner coaxial line shall be terminated with a507 load impedance situated at the rear of the connector on the detect
27、or side. 5 Method 5.1 Test setup The test setup shall comply withFigure 2. The signal from the generator shall be fed through a10dB attenuator to a parallel circuit comprising a coaxial switch connected so that the signal can be fed alternatively to the radiation detecting equipment and to a variabl
28、e 0 dB to 100 dB reference attenuator. This attenuator calibrated to 3dB shall be adjustable in1dB steps. The level of signal power shall be indicated by a detector isolated from the test circuit by a3dB to10dB attenuator. Care shall be taken to ensure that the signal is a result of high frequency r
29、adiation in the specimen and not due to a faulty termination inside the test setup. The connectors used to couple together the various elements of the test circuit shall be of a low radiation type with a nominal impedance of507, a voltage standing wave ratio of less than1,5 and a minimum attenuation
30、 of the shield of100dB. The nominal impedance of the generator output and the nominal impedance of the detector input shall be507 with a voltage standing wave ratio of1,5. The input and output voltage standing wave ratio of the reference attenuator shall be less than1,5 in the20dB to100dB range. All
31、 terminations shall have a radiation of at least10dB less than the test requirements.EN2591-213:1997 4 BSI 04-1999 5.2 Procedure The shielding effectiveness shall be measured by the radiation detecting equipment. The radiation from the conductor inside the specimen into the outer coaxial line shall
32、be measured at the specified frequencies to 5%. Tune the outer coaxial line to obtain the maximum signal output by sliding the short. Read the signal level on the detector. Switch the generator output and the detector input to the reference attenuator by means of the coaxial switches. Adjust the ref
33、erence attenuator output signal level to equal the signal level read before. The radiation loss in the radiation detector can be read directly on the reference attenuator. 5.3 Requirement Attenuation shall not be less than that specified. Figure 1 Radiation detecting equipment Figure 2 Test setup5 b
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