1、ASD STANDARD NORME ASD ASD NORM prEN 3745-410 Edition P 1 September 2006 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Gulledelle 94 - B-1200 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.org ICS: 49.060 Descriptors: ENGLISH VERSION
2、 Aerospace series Fibres and cables, optical, aircraft use Test methods Part 410: Thermal life Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 410 : Dure de vie en temprature Luft- und Raumfahrt Faseroptische Leitungen fr Luftfahrzeuge Prfverfahren Teil 410: Lebens
3、dauer unter Temperatureinwirkung 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 technically approv
4、ed 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. After examinatio
5、n 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 at national level
6、 by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 30 September 2006 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2006 by ASD-STAN C
7、opyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 3745-410:20062 Contents Page Foreword .2 1 Scope3 2 Normative references3 3 Preparation of specime
8、ns 3 4 Apparatus.4 5 Method4 Foreword This standard was reviewed by the Domain Technical Coordinator 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 Pub
9、lication. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 3745-410:20063 1 Scope This standard specifies method for determining life versus tempe
10、rature curves of an optical cable. 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 referenced document (including any amendments)
11、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 3745-301, Aerospace series Fibres and cables, optical, aircraft use Test m
12、ethods Part 301: Attenuation. ASTM-D3032, Standard test methods for hookup wire insulation. 2) 3 Preparation of specimens 3.1 The fibre ends shall be prepared in accordance with EN 2591-100. If not yet at standard test conditions, the specimens shall be subjected to standard test conditions and stab
13、ilized at these conditions for 24 hours as defined in EN 3745-100. Specimens have to be fixed on an apparatus representative of aircraft installation. Ten specimens are fixed on apparatus and constitute a set for life testing at each temperature. A minimum of four sets of specimens is necessary. 3.2
14、 The following details shall be specified if not already included in the product standard: Type of fibre/cable from which the specimens were taken, Type/number/pitch of clamps Minimum authorized long term bend radius Length of specimens if not 10 m Maximum permissible variation in attenuation if not
15、 3 dB Temperature values (1 2 3 4) 1) In preparation at the date of publication of this standard.2) Published by: ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, USA. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS u
16、nder license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 3745-410:20064 4 Apparatus The apparatus shall comprise: A Light Launch System (LLS) as defined in EN 2591-100, A split coupler 1 10, A Light Detector System (LDS) as defined in EN 2591-10
17、0, with 10 channel recorder, A fixture to secure the specimens, A climatic chamber capable of temperature control of 2 C. 5 Method 5.1 Initial measurements If the value of the highest temperature value is not specified in the product standard make a quick estimation of the highest test temperature w
18、ith one specimen during 24 h at 80 C above the nominal rating temperature. The variation in attenuation shall not exceed the specified value. 5.2 Procedure The attenuation shall be monitored throughout the test in accordance with EN 3745-301, method C. Connect the specimen ends to the coupler, the c
19、oupler to LLS and the other specimen ends to LDS. Place the fixture in the test chamber. The coupler and connectors shall not be into climatic chamber. Begin the test sequence with the highest test temperature (1) since exposure times will be relatively short. Record the exposure time to failure for
20、 each specimen. A failure is defined when the variation in attenuation is higher than the specified value. Stop the test sequence when all specimens in group have failed. Calculate the log average life as defined in ASTM-D3032. If the log average life at this temperature (highest) is found to be les
21、s than 100 h, too high a test temperature has been selected and these data should be discarded. Tests should be repeated at lower temperature. Repeat this procedure with the group N 2 of specimens for 2 temperature value. Calculate the log average life as defined in ASTM-D3032. Repeat this procedure
22、 with the group N 3 of specimens for 3 temperature value. Calculate the log average life as defined in ASTM-D3032. Repeat this procedure with the last group of specimens for 4 temperature value (lowest). Calculate the log average life as defined in ASTM-D3032. If the average life found at this test
23、temperature is less than 5 000 h, this test will be made at lower temperature. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 3745-410:20065 5.3
24、 Final measurements and requirement The calculation of average life and extrapolation have defined in the ASTM-D3032 - Standard test methods for hookup wire insulation. 5.4 Special precautions Extrapolation to a temperature index expected at the selected end of life (10 000 h, 20 000 h or 40 000 h)
25、should not exceed 25 C below the lowest aging test temperature. The log average life at the highest test temperature (1) shall not be less than 100 h. The log average life at the lowest test temperature (4) shall not be less than 5 000 h. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-
