AECMA PREN 3475-508-2006 Aerospace Series Cables Electrical Aircraft Use Test Methods Part 508 Plating Thickness Edition P 2《航天系列 飞行器用的电缆试验方法.第508部分.电镀板厚度》.pdf
《AECMA PREN 3475-508-2006 Aerospace Series Cables Electrical Aircraft Use Test Methods Part 508 Plating Thickness Edition P 2《航天系列 飞行器用的电缆试验方法.第508部分.电镀板厚度》.pdf》由会员分享,可在线阅读,更多相关《AECMA PREN 3475-508-2006 Aerospace Series Cables Electrical Aircraft Use Test Methods Part 508 Plating Thickness Edition P 2《航天系列 飞行器用的电缆试验方法.第508部分.电镀板厚度》.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、ASD STANDARD NORME ASD ASD NORM prEN 3475-508 Edition P 2 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.orgICS: 49.060 Supersedes edition P 1 of Jun
2、e 1997 and will supersede EN 3475-508:2002 Descriptors: ENGLISH VERSION Aerospace series Cables, electrical, aircraft use Test methods Part 508: Plating thickness Srie arospatiale Cbles lectriques usage aronautique Mthodes dessais Partie 508 : paisseur du revtement Luft- und Raumfahrt Elektrische Le
3、itungen fr Luftfahrtverwendung Prfverfahren Teil 508: Schichtdicke des Uberzugs 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 Aer
4、ospace 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-i
5、dentification 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 30 September 2006 Comments should be sent within six months after the date of publication to ASD-STAN
7、 Electrical Domain Copyright 2006 by ASD-STAN 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 3475-508:20062 Contents Page Foreword2 1 Scope 3 2
8、Normative references 3 3 Test methods3 3.1 General3 3.2 Test method 1.3 3.2.1 Principle3 3.2.2 Method 3 3.2.3 Calibration 4 3.2.4 Preparation for measurement.4 3.2.5 Determining the plating thickness.4 3.3 Test method 2.4 3.3.1 Principle4 3.3.2 Method 4 3.3.3 Preparation for measurement.4 3.3.4 Dete
9、rmining the plating thickness and the centricity of the coating .5 3.4 Test method 3.5 3.4.1 Principle5 3.4.2 Method 5 3.4.3 Preparation for measurement.5 3.4.4 Determining the plating thickness and the centricity of the coating .5 3.5 Test method 4.5 3.5.1 Principle5 3.5.2 Method 6 3.5.3 Preparatio
10、n for measurement.6 3.5.4 Determining the plating thickness of the coating 6 3.6 Test method 5.6 3.6.1 Principle6 3.6.2 Method 6 3.6.3 Preparation for measurement.7 4 Requirements.8 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquirie
11、s 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. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMA Not for ResaleNo repro
12、duction or networking permitted without license from IHS-,-,-prEN 3475-508:20063 1 Scope This standard specifies the procedures for measuring the plating thickness and centricity of metallic coatings on single conductors. It shall be used together with EN 3475-100. 2 Normative references The followi
13、ng 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) applies. ISO 6955, Analytical spectroscopic methods Flame emission, a
14、tomic absorption, and atomic fluorescence Vocabulary. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General. 3 Test methods 3.1 General Five methods may be used. In the event of dispute, method 4 shall be the reference method for the measurement of plating thi
15、ckness. 3.2 Test method 1 3.2.1 Principle This method uses an analytical procedure for evidence of elements and determining concentration by means of measuring the atomic absorption of optical radiation. The average plating thickness is determined by converting the measured element concentration. Th
16、e determination of the centricity (distribution of the metal coating) is not possible with this method. 3.2.2 Method A flame AAS (Atome Absorption Spectrometry) is sufficient to determine metal concentrations as defined in ISO 6955. Other procedures, e.g. graphite tube, cold steam or hybrid techniqu
17、e, permit higher resolutions. General instructions on the necessary equipment, such as gas fuels, oxidizers, light sources, etc., and the actual operation of the equipment can be found in the operating instructions for the relevant AAS equipment. Typical detection limits for flame AAS: see Table 1.
18、Table 1 Element mg/l Ag 0,002 Ni 0,01 Sn 0,001 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 3475-508:20064 3.2.3 Calibration In atomic absorpt
19、ion spectrometry calibration shall take place by the use of reference solutions (standard solutions). Standard solutions are solutions which contain the element to be assessed (e.g. Ag, Ni, Sn) in a known concentration and, if required, the chemicals used in producing the sample solution and the com
20、ponents affecting the measurement in the same or a similar concentration to the samples for analysis. The standard calibration method involves establishing the reference function with several reference solutions starting from extinction A = 0 up to the extinction of the highest anticipated concentra
21、tion of the solution to be measured. 3.2.4 Preparation for measurement Three samples of a single strand are dissolved in acid (e.g. nitric acid), diluted with H2O and inserted in the (AAS) measuring equipment. 3.2.5 Determining the plating thickness The average value of the plating thickness is dete
22、rmined by conversion of the measured concentration and the length and diameter of the sample which were determined prior to measurement. 3.3 Test method 2 3.3.1 Principle This method uses a procedure for determining the plating thickness and centricity of metallic coatings on single conductors using
23、 a scanning electron microscope (SEM). 3.3.2 Method The object to be examined is scanned with electron beams. Because of the short wavelength, this allows high resolution and magnification (up to 3 105). A further advantage is the great definition (three-dimensional image). The geometries of the sam
24、ples can be directly measured and documented. In combination with X-ray analysis equipment rapid assessment of the elements in the sample is possible. 3.3.3 Preparation for measurement a) A sample of the strand for analysis (d 0,5 mm shall be cast standing upright in epoxy resin. b) The cast samples
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