1、ASD STANDARD NORME ASD ASD NORM prEN 3745-514 Edition P 1 October 2007 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Avenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: 49.060 Descriptors: ENGLISH
2、VERSION Aerospace series Fibres and cables, optical, aircraft use Test methods Part 514: Cable twist bend Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 514 : Essais de torsion et de courbure Luft- und Raumfahrt Faseroptische Leitungen fr Luftfahrzeuge Prfverfahre
3、n Teil 514: Kombinierte Torsions- und Biegeprfung 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 Aerospace Industry. It has been t
4、echnically 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-identification of the standard.
5、 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 have then to implement the EN
6、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 31 October 2007 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 200
7、7 by ASD-STAN prEN 3745-514:20072 Contents Page Foreword2 1 Scope 3 2 Normative references 3 3 Preparation of specimens.3 4 Apparatus .3 5 Method (EIA/TIA 455-91)4 6 Final measurements and requirements.5 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical
8、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 3745-514:2007 3 1 Scope This standard specifies a method for measuring the combined torsion and bending proper
9、ties of a fibre optic cable. It shall be used together with EN 3745-100. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the reference
10、d 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 100: General. 1)EN 3745-201, Aerospace series Fibres and
11、 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 The specimens shall be prepared according to the product standard. If not yet at standard te
12、st conditions, the specimens shall be subjected to standard test conditions and stabilised at these conditions for 24 h as defined in EN 2591-100. Sample length typically 1,7 m unless otherwise stated. 4 Apparatus The apparatus shall comprise: Transmitted power monitoring (LLS and LDS) as defined in
13、 EN 2591-100; Fibre and cable attenuation test apparatus as defined in EN 3745-301; Mandrel, D diameter as specified in product standard; Mass specified in product standard; Tensile load, as specified in product standard; Test temperature (25 C unless otherwise stated); Sample length (1,7 m unless o
14、therwise stated). The number of test cycles shall be specified in the product standard. 1) Published as ASD Prestandard at the date of publication of this standard. prEN 3745-514:20074 5 Method Unless otherwise stated, the test sample shall be conditioned, for at least two hours, at standard atmosph
15、eric conditions before conducting the test and the initial attenuation has to be recorded. The specimen shall be installed in the apparatus as shown in Figure 1 below, with length as specified in the product standard. One test cycle consists in the cable being rotated 180 clockwise, returned to the
16、starting position and then rotated 180 anticlockwise and returned to the starting position. The cable shall be tested for the number of cycles specified in the product standard. The specimen shall be removed from the apparatus and connected to LSS and LDS (see EN 3745-301). Key 1 Test specimen stand
17、ard length 1,7 m 2 Mass (defined in product standard) 3 200 mm = vertical motion 90 twist from centre (total travel 180) 4 Arm driven at 30 cycles per minute 5 Adjustable sheave, adjust to cable diameter plus 0,1 max. Note Twist per millimetres of active length to be kept constant when changing pull
18、ey and larger clamping arm. Figure 1 Twist bend apparatus 1 4 5 2 3 prEN 3745-514:20075 6 Final measurements and requirements A visual examination shall be carried out as defined in EN 3745-201 to show that the finished cable specimens do not exhibit any evidence of jacket material degradation. It s
19、hall reveal no jacket softening, surface damage (cracking, splitting, or other defect to permit jacket penetration) or any identification marking impairment which affects legibility. There shall be no fibre break. The change in optical transmittance of the fibre(s) shall not exceed the value given in the product standard after testing (EN 3745-301).
