1、Elements of electrical and optical connection Test methods Part 602: Optical elements - Variation of attenuation and optical discontinuity The European Standard EN 2591-602:2001 has the status ofa British Standard ICs 49.060 BS EN 259 1-6021200 1 A present to the responsible European committee any e
2、nquiries 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. Cr oss-r e fer e
3、nc e s The British Standards which implement international or European publications 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 Cata
4、logue. A British Standard 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 com
5、prises a front cover, an inside front cover, the EN title page, pages 2 to 4, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 14 December 2001 ISBN O 580 38071 8 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE N
6、ORM EN 2591-602 November 2001 ICs 49.060 English version Aerospace series - Elements of electrical and optical connection - Test methods - Part 602: Optical elements - Variation of attenuation and opt ica I d isco n t i nu i ty Srie arospatiale - Organes de connexion lectrique et optique - Mthodes d
7、essais - Partie 602: Organes optiques - Variation dattnuation et discontinuit optique Luft- und Raumfahrt - Elektrische und optische Verbindungselemente - Prfverfahren - Teil 602: Optische Elemente - Dmpfungsnderung und optische Unterbrechung This European Standard was approved by CEN on 4 June 2001
8、 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 and bibliographical references concerning such national standards may be obtained on a
9、pplication 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 responsibility of a CEN member into its own language and notified to the Management Centre has t
10、he 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, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE
11、 FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2591-602:2001 E EN 2591-602:2001 (E) F
12、oreword 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
13、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 May 2002, and conflicting national standards shall be withdrawn at the latest by Ma
14、y 2002. According to the CENKENELEC 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, Norw
15、ay, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 2 EN 2591-602:2001 (E) 1 Scope This standard specifies methods of detecting variation of attenuation and optical discontinuity of the transmitted signal during environmental or mechanical testing for optical connection elements (includ
16、ing permanent connections) and fibre optic couplers. It shall be used together with EN 2591-100. 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
17、 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 the latest edition of the publication referred to applies. EN
18、 2591-100 Aerospace series - Elements of electrical and optical connection - Test methods - Part 100: General 1) 3 Preparation of specimens 3.1 Specimens shall be prepared as defined in the product standard and for each method of test: - the fibre ends shall comply with requirements of EN 2591-100 (
19、Fibre end preparation and termination cleaning); - the fibre ends shall be fixed to the light launch and light detector systems as defined in EN 2591-100; - the fibrekable used for the test shall meet the requirements of the optical connection element or coupler; - movement of the fibreskables and t
20、emporary joints shall be minimized during the test set-up and testing process; - the minimum bend radius of the fibrekable shall not be exceeded. Unless otherwise specified, specimens shall be fitted with normal accessories and terminated with (2 f 0,2) m length of cable. If necessary, temporary joi
21、nts shall be used. If a reference cable/fibre is required, its length shall be 4 m and it shall be prepared from the same batch and terminated by the same method used for the specimens. Optical contacts shall be assembled into the appropriate optical connection element. 3.2 Unless otherwise indicate
22、d in the technical specification, the following details shall be specified: - number of measurements to be averaged; - number of channels to be tested in a multi-channel device; - minimum bandwidth of the detection device. 3.2.1 Variation of attenuation (Method A) - Maximum permissible variation of
23、attenuation - Sampling rate of attenuation - Type of cable/fibre 3.2.2 Optical discontinuity (Method B) - Duration of discontinuity to be measured - Acceptable number of discontinuities - Type of cable/fibre - Discontinuity threshold in dB 1) Published as AECMA Prestandard at the date of publication
24、 of this standard 3 EN 2591-602:2001 (E) 4 Apparatus It shall comprise: - a Light Launch System (LLS) as defined in EN 2591-100; - a Light Detector System (LDS) as defined in EN 2591-100. 5 Methods 5.1 Procedure 5.1 .I Unless otherwise specified, the specimen under test shall be connected through th
25、e cable/fibre to the measuring equipments. Set the attenuation level to zero to obtain a reference value. Proceed to the test and check continuously the variation of attenuation. Figure 1 shows a typical test arrangement. Method A - Variation of attenuation 5.1.2 Unless otherwise specified, the spec
26、imen under test shall be connected through the cable/fibre to the measuring equipments. Adjust thresholds (dB drop and time duration) as specified in the product standard. Check the transmitted signal, any discontinuities detected at this point shall be traced to their source, and eliminated. Discon
27、tinuities which cannot be eliminated shall be accounted for in the performance assessment of the test specimen. Figure 1 shows a typical test arrangement. Method B - Optical discontinuity I P- 4m Key 1 Specimen 2 Processing system Figure 1 5.2 Discontinuities and/or variation of attenuation shall be
28、 recorded according to the characteristics defined in the product standard. Extraneous discontinuities and/or variation of attenuation attributable to the malfunction of the measuring equipment shall be discounted. The number of discontinuities and/or variations of attenuation shall not exceed that
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