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1、 W - - - - - - - - - - 7 7- - 7- - 7 7- - 7- 7- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - W W D - w - - - - EN 3475-515:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Preparation of specimens .4 4 Tests conditions 4 5 Apparatus .5 6 Method 5 EN 3
2、475-515:2009 (E) 3 Foreword This document (EN 3475-515:2009) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval o
3、f the National Associations and the Official Services of the member countries of ASD, 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 February 2010, and conflicti
4、ng national standards shall be withdrawn at the latest by February 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to
5、the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithu
6、ania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3475-515:2009 (E) 4 1 Scope This standard specifies a method to determine the ability of an electrical cable to withstand crushing under specified enviro
7、nmental conditions (e.i. during maintenance operations). It shall be used together with EN 3475-100. 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 lat
8、est edition of the referenced document (including any amendments) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General. EN 3475-201, Aerospace series Cables, electrical, aircraft use Test methods Part 201: Visual examination. EN 3475-805, Aerospace s
9、eries Cables, electrical, aircraft use Test methods Part 805: Characteristic impedance. EN 3475-806, Aerospace series Cables, electrical, aircraft use Test methods Part 806: Attenuation. EN 3475-812, Aerospace series Cables, electrical, aircraft use Test methods Part 812: Return loss (VSWR). 3 Prepa
10、ration of specimens Connectors shall be fitted on each end of the test specimens (coaxial cables) to be connected to the measuring device. Length of specimens: 2 m, unless otherwise defined in product standard. 4 Tests conditions Unless otherwise specified in the product standard, the following test
11、 conditions shall be applied: Temperature at which test is carried out = 20 C; Number of specimens: 3. The following requirements shall be specified in the product standard: The frequency band of the measurements (DC up to the maximum frequency of the standard if not specified otherwise); The compre
12、ssive force to be applied; The duration of the application of the load. EN 3475-515:2009 (E) 5 5 Apparatus The apparatus shall allow a sample to be crushed between a flat steel base plate and a movable steel plate which applies gradually, by any convenient method, the crushing force uniformly over a
13、 100 mm length of the sample. The plates shall be suitably radiused to prevent sharp edges digging into the specimen. Suitable apparatus is shown in Figure 1. Dimensions in millimetres Top view End view Key 1 Guide 2 Load 3 Specimen R minimum bend radius as defined in the product standard of the cab
14、le under test. Figure 1 Test methods 6 Method 6.1 Measurements Measurements, at specified frequency band, shall be performed according to their specific test standards, for: EN 3475-805: Characteristic impedance; EN 3475-806: Attenuation; EN 3475-812: Return loss. 6.2 Test procedure Place the specim
15、en in the test fixture. Step 1 : With no load applied, obtain the initial measurement for each test. Step 2 : The load shall be applied at a constant rate of loading as specified in the product standard until the required applied load is obtained. Step 3 : The load shall be maintained for the specif
16、ied period. 100 EN 3475-515:2009 (E) 6 Step 4 : Remove the load. Step 5 : When the load has been fully removed allow the specimen to recover for 15 min. The variation of the return loss (EN 3475-812), shall be monitored continuously throughout the test. 6.3 Final measurements Step 1 : the following
17、tests should be carried out: EN 3475-201: Visual examination EN 3475-805: Characteristic impedance; EN 3475-806: Attenuation; EN 3475-812: Return loss. 6.4 Requirements Characteristic impedance, attenuation and return loss, before (step 1) and after (step 5) test shall be within the requirements of the product standard. The return loss values during the test (step 3 and step 4) shall be recorded. - -