1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 3745-517 Edition P 2 March 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 P
2、1 of December 2010 and will supersede EN 3745-517:2012 Descriptors: ENGLISH VERSION Aerospace series Fibres and cables, optical, aircraft use Test methods Part 517: Cable tie clamping test Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 517 : Essai de serrage par c
3、olliers de frettage Luft- und Raumfahrt Faseroptische Leitungen fr Luftfahrzeuge Prfverfahren Teil 517: Klemmprfung mit Kabelbindern This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardizatio
4、n). It is published for the needs of the European Aerospace 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
5、is affected, physically or functionally, without re-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 f
6、ull European Standard (EN). The CEN national members 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 March 2015 Comments should be sent within si
7、x months after the date of publication to ASD-STAN Electrical Domain Copyright 2015 by ASD-STAN prEN 3745-517:2015 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Preparation of specimens . 3 4 Apparatus . 4 5 Method 5 Foreword This standard was reviewed by the Domain Technical C
8、oordinator of ASD-STANs Electrical Domain. After 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 3745-517:2015 (E) 3 1 Scope This standard specifies a method of determining
9、 the attenuation variation of an optical cable when clamped to a mandrel with cable ties, simulating the condition in an installed harness. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For
10、dated references, only the edition cited applies. For 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 3745-201, Aerospace series Fibres
11、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 EN 4056-003, Aerospace series Cable ties for harnesses Part 003: Plastic cable ties, operating temperatures 65 C to 10
12、5 C and 65 C to 150 C Product standard 3 Preparation of specimens 3.1 The fibre ends shall conform to the fibre end preparation criteria specified in EN 2591-100. 3.2 The length of fibre to be tested shall be in accordance with the applicable product standard. 3.3 The specimens shall be subjected to
13、 standard test conditions and stabilized at these conditions for 24 h as defined in EN 2591-100. 3.4 The following details shall be specified if not already included in the product standard. Number of plastic ties if not 6. Spacing between plastic ties if not then it is 150 mm. Setting of the tool.
14、Mandrel diameter. Number of specimen (if not then 3). The wavelengths to be measured if not 1 300 nm and 850 nm. prEN 3745-517:2015 (E) 4 4 Apparatus A Light Launch System (LLS) and Light Detection System (LDS) as defined in EN 2591-100. A mandrel with a diameter specified in the applicable product
15、standard. A typical arrangement is shown in Figure 1. Key 1 Fibre optic cable 2 Cable tie 3 Mandrel Figure 1 Cross sectional view Key 1 Mandrel 1 Fibre optic cable 3 Head of cable tie shall be positioned on the mandrel Figure 2 prEN 3745-517:2015 (E) 5 5 Method 5.1 Procedure a) Measure and record th
16、e optical transmittance of the specimen for both wavelengths 850 nm and 1 300 nm while the specimen is aligned on the test mandrel to establish a reference measurement. b) Install the specified number of miniature cable tie EN 4056-003 type 1 size code S or equivalent shall be used over the cable as
17、 shown in Figure 2 and mandrel at a separation distance specified in the applicable product standard. c) Using the hand tool specified in MS 90387, tighten the cable tie to the tension value specified by the applicable product standard. d) Leave the assembly to stand for 15 minutes (to allow the cab
18、le tie to relax) then measure and record the final optical transmittance of the specimen at both wavelengths 850 nm and 1 300 nm. e) For information, remove the cable ties and measure the final optical transmittance of the specimen at both wavelengths 850 nm and 1300 nm when the specimen is removed
19、from the test fixture. 5.2 Final measurements and requirements Measure the residual attenuation variation (EN 3745-301, method C) before, after installing and (for information) after removing the specimen from the test fixture to ensure no fibre breakage. The difference in attenuation shall be less than the specified value in the applicable product standard. Perform a visual examination according to EN 3745-201.
