1、Cables, electrical, aircraft use Test methods Part 808: Cross-talk The European Standard EN 3475-808:2002 has the status of a British Standard ICs 49.060 BS EN 3475-80812002 WkN present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the U
2、K 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 The British Standards which implement international or European public
3、ations referred to in this 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 provi
4、sions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not ofitself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 4,
5、an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd.No. I Date I Comments O BSI 25 June 2002 ISBN O 580 39895 I EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-808 June
6、 2002 ICs 49.060 English version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 808: Cross-talk Srie arospatiale - Cbles lectriques usage aronautique - Mthodes dessais - Partie 808: Diaphonie Luft- und Raumfahrt - Elektrischen Leitungen fr Luftfahrt Verwendung - Prfverfahr
7、en - Teil 808: Nebensprechen This European Standard was approved by CEN on 1 March 2002 CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists
8、 and bibliographical references concerning such national standards may be obtained on application to the Management Centre 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 responsib
9、ility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Ne
10、therlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means r
11、eserved worldwide for CEN national Members. Ref. No. EN 3475-808:2002 E EN 3475-80812002 (E) Foreword This document (EN 3475-808:2002) has been prepared by the European Association of Aerospace Manufacturers (AECMA). After enquiries and votes carried out in accordance with the rules of this Associat
12、ion, this Standard 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 endorsemen
13、t, at the latest by December 2002, and conflicting national standards shall be withdrawn at the latest by December 2002. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium,
14、Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 2 EN 3475-80812002 (E) 1 Scope This standard specifies methods for measuring the cross-talk of a cable (multicore c
15、ables). It shall be used together with EN 3475-100. 2 Normative references 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 d
16、ated 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 the latest edition of the publication referred to applies. EN 3475-100 Aerospace series - Cables, electric
17、al, aircraft use - Test methods - Part 100: General 3 Preparation of specimens These shall be stripped, prepared and connected to the measuring devices. 4 Methods Un,ss otherwise indicated in the proLJct standarc connected as shown in figures 1 and 2. the measurement shall be taken on a 10 m ca,d se
18、ction, I Figure 1 - Cross-talk measurement - Measurement in asymmetric mode 3 EN 3475-80812002 (E) ? Oscilloscope used as differential voltmeter O AB 4t 7 Figure 2 - Cross-talk measurement - Measurement in symmetric mode Each pair shall be connected at each end to a resistor equivalent to the specif
19、ied characteristic impedance Z, of the pair. Connections shall be as short as possible so as to minimize the interaction of the ends. The emittive pair is supplied by a generator G at a frequency of which the output impedance is as close as possible to the characteristic impedance Z, of the pairs. M
20、easure, using high input impedance voltmeter (e.g. oscilloscope): - the voltage at the input of the emittive pair UA; - the voltage at the generator side of a pair next to the emittive pair (near-end cross-talk) U2; - the voltage at the end remote from the generator of a pair next to the emittive pa
21、ir (far-end cross-talk) u3. u2 u1 Near-end cross-talk attenuation is equal to 20 Ig -, in decibels u3 u1 Far-end cross-talk attenuation is equal to 20 Ig -, in decibels 5 Req u i remen t The near-end and far-end cross-talk attenuation values shall be above the values specified in the product standar
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