ASD-STAN PREN 3745-510-2015 Aerospace series Fibres and cables optical aircraft use Test methods Part 510 Bending test (Edition P 3).pdf

1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 3745-510 Edition P 3 January 2015 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: 49.060 Supersedes edition

2、P 2 of November 2010 and will supersede EN 3745-510:2012 Descriptors: ENGLISH VERSION Aerospace series Fibres and cables, optical, aircraft use Test methods Part 510: Bending test Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 510 : Essai de courbure Luft- und Rau

3、mfahrt Faseroptische Leitungen fr Luftfahrzeuge Prfverfahren Teil 510: Biegetest This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Ae

4、rospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-

5、identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members

6、 have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 1st January 2015 Comments should be sent within six months after the date of publication to ASD-STAN

7、 Electrical Domain Copyright 2015 by ASD-STAN prEN 3745-510:2015 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Preparation of specimens . 3 4 Apparatus . 4 5 Methods 6 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After

8、inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 3745-510:2015 (E) 3 1 Scope This standard specifies a method of determining the attenuation variation of an optical cable du

9、ring mechanical bending under load at the maximum and minimum operating temperatures. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For

10、undated references, the latest edition of the referenced document (including any amendments) applies. EN 2591-100, Aerospace series Elements of electrical and optical connection Test methods Part 100: General EN 3745-100, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 10

11、0: General EN 3745-201, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 201: Visual examination EN 3745-301, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 301: Attenuation 3 Preparation of specimens 3.1 General The specimens shall be prepared

12、 according to the product standard. If not yet at standard test conditions, the specimens shall be subjected to standard test conditions and stabilized at these conditions for 24 h as defined in EN 2591-100. 3.2 Method A Unless specified in the technical specification, the following details shall be

13、 stated: Number and length of or cable (standard concerns cable only). Mass M to be applied to ensure contact between the cable and the mandrel. Diameter(s) D of the mandrel. Number of turns N. Maximum permissible variation of attenuation induced after N turns (according to EN 3745-301). Maximum per

14、missible variation of attenuation 1 h after the end of the test. Maximum permissible residual attenuation after removal from test set-up. The wavelengths to be measured. 3.3 Method B Unless specified in the applicable product standard, the following details shall be stated: The number and length of

15、specimens. Mass M to be applied to ensure contact between the cable and the mandrel. Diameter(s) D of the mandrel. The separation distance between the mandrels (L). The number of wraps around the mandrels (N). The maximum permissible variation in attenuation. The wavelengths to be measured. prEN 374

16、5-510:2015 (E) 4 4 Apparatus 4.1 Method A The apparatus shall comprise: A Light Launch System (LLS) as defined in EN 2591-100. A Light Detection System (LDS) as defined in EN 2591-100. A test fixture capable of applying the bending test required by the specification. A typical arrangement is shown i

17、n Figure 1. Key 1 Fixed point 2 Fixed mandrel 3 Mass 4 LLS 5 LDS Figure 1 4.2 Method B The apparatus shall comprise: A Light Launch System (LLS) as defined in EN 2591-100. A Light Detection System (LDS) as defined in EN 2591-100. A test fixture capable of applying the bending test required by the sp

18、ecification. A typical arrangement is shown in Figure 2. prEN 3745-510:2015 (E) 5 Upper view Front view Key 1 LLS 2 Mandrels 3 LDS 4 Fibre optic cable 5 Weights Figure 2 prEN 3745-510:2015 (E) 6 5 Methods 5.1 Method A 5.1.1 Procedure Method A Connect the specimen end to the LLS. After fixation of th

19、is specimen on the fixed point, install the mass on the specimen. Connect the specimen end to the LDS. Zero the LDS to establish a reference measurement. Roll up the specimen one turn on the mandrel. Measure the variation of attenuation (EN 3745-301, method C). Repeat N times the two last operations

20、 Maintain the specimen on the test equipment for 1 h and then remeasure the variation of attenuation. 5.1.2 Final measurements and requirements Method A Measure the residual attenuation (EN 3745-301, method C) after removing the specimen from the test equipment. EN 3745-201 Visual examination 5.2 M

21、ethod B 5.2.1 Procedure Method B Install the mandrels on a suitable fixture in to maintain a separation distance (center to center) as specified in the applicable product standard. Connect the specimen ends to the LLS and LDS. Straighten the specimen and perform the initial transmittance measurement

22、 to obtain a reference measurement. Wrap the entire specimen around two mandrels with significant tension through a load of weight M defined in the product standard as shown in Figure 2 to ensure a perfect contact with the mandrel on half perimeter. After the winding is complete, perform the final t

23、ransmittance measurement. 5.2.2 Final measurements and requirements Method B Measure the attenuation variation (EN 3745-301, method C) after wrapping the specimen on the mandrels. The difference in attenuation shall be less than the specified value in the applicable product standard. EN 3745-201 Visual examination