SIST EN 3475-705:2006
(Main)Aerospace series - Cables, electrical, aircraft use - Test methods - Part 705: Contrast measurement
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 705: Contrast measurement
This standard specifies the process to be applied for measuring the contrast of wire and cable identification markings against the background of the unmarked wire insulation. It has been developed primarily to define a reproducible process of contrast value determination for use both to determine the intrinsic laser markability of wires at the time of manufacture or later, and to enable electrical wiring systems manufacturers to ensure that the whole process of wire marking is carried out to the required standard.
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 705: Kontrastmessung
In der Luftfahrtindustrie besteht die Anforderung alle Leitungen und Kabel innerhalb eines elektrischen Luftfahrzeugsystems mit Kennzeichen für die Schaltkreisidentifizierung in gleichmäßigem Abstand über die Länge des Kabels zu versehen. Verschiedene Verfahren für die Kennzeichnung dieser Identifizierung auf der Oberfläche von elektrischen Leitungen und Kabeln einschließlich derer mit Tinte und Laser werden verwendet. Die Lesbarkeit der Kennzeichnungen hängt ab vom verwendeten Verfahren und vom Material der Isolation. Mindestanforderungen an den Kontrast sind erforderlich um die Wiedererkennung der Identifizierungskennzeichen zu erleichtern.
Série aérospatiale - Câbles électriques a usage aéronautique - Méthodes d'essais - Partie 705 : Mesure de contraste
Aeronavtika – Električni kabli za uporabo v zračnih plovilih – Preskusne metode – 705. del: Meritev kontrasta
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Cables, electrical, aircraft use - Test methods - Part 705: Contrast measurementSérie aérospatiale - Câbles électriques a usage aéronautique - Méthodes d'essais - Partie 705 : Mesure de contrasteLuft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 705: KontrastmessungTa slovenski standard je istoveten z:EN 3475-705:2005SIST EN 3475-705:2006en49.060ICS:SLOVENSKI
STANDARDSIST EN 3475-705:200601-julij-2006
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3475-705October 2005ICS 49.060Supersedes EN 3475-705:2002
English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 705: Contrast measurementSérie aérospatiale - Câbles électriques à usageaéronautique - Méthodes d'essais - Partie 705 : Mesure decontrasteLuft- und Raumfahrt - Elektrische Leitungen fürLuftfahrtverwendung - Prüfverfahren - Teil 705:KontrastmessungThis European Standard was approved by CEN on 12 September 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3475-705:2005: E
EN 3475-705:2005 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.4 2 Normative references.4 3 Terms and definitions.5 4 Preparation of samples.5 5 Apparatus, measurement and process.6 5.1 Apparatus.6 5.2 Measurement.7 5.3 Process.8 6 Requirements.10
EN 3475-705:2005 (E) 3 Foreword This European Standard (EN 3475-705:2005) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA, 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 April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006. 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. This European Standard supersedes EN 3475-705:2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
EN 3475-705:2005 (E) 4 Introduction It is a requirement within the aerospace industry that all wires and cables within an aircraft electrical system are identified with a circuit identification code at regular intervals down the length of the wire. Various marking methods are used for marking these identification codes on to the surface of electrical wires or cables including ink based and laser based processes. The legibility of the markings is dependent upon the process used and the insulation medium. Minimum standards of contrast are required to facilitate reading back of the identity codes. 1 Scope This standard specifies the process to be applied for measuring the contrast of wire and cable identification markings against the background of the unmarked wire insulation. It has been developed primarily to define a reproducible process of contrast value determination for use both to determine the intrinsic laser markability of wires at the time of manufacture or later, and to enable electrical wiring systems manufacturers to ensure that the whole process of wire marking is carried out to the required standard. 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) applies. ISO 7724-1, Paints and varnishes — Colorimetry — Part 1: Principles. EN 3475-706, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 706: Laser markability. IEC 15-2, Colorimetry. TR 4543, UV laser wire marking systems for aircraft wire and cable identification.1)
1) In preparation at the date of publication of this standard.
EN 3475-705:2005 (E) 5 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 contrast the ratio of the difference in luminance between the marked and unmarked areas of the insulation divided by the luminance of the unmarked insulation 3.2 luminance the quantitative measurement of the visible light reflected from a surface, in this case the wire or cable insulation 3.3 laser laser is an acronym for Light Amplification by the Stimulated Emission of Radiation. Lasers are a source of intense monochromatic light in the ultraviolet, visible or infrared region of the spectrum. 3.4 ultraviolet (abbreviation UV) electromagnetic radiation in a wavelength range from approximately 200 nm to 400 nm 3.5 UV laser a laser that produces a beam of UV radiation 3.6 fluence the energy density, measured in J cm-2 (Joules per square cm) of a single pulse of the laser beam, which, for the purposes of this document, is taken at the surface of the wire insulation or cable jacket 3.7 wavelength wavelength (λ) is measured in nanometres, nm. 1 nm = 10-9 m. λ = c/f where c is the velocity of light and f is the frequency 4 Preparation of samples The wire or cable samples shall be identified in accordance with the applicable manufacturing instructions for the marking equipment. Where samples are to be UV laser marked this shall be done using the fluence specified in TR 4543 or the relevant wire or aircraft manufacturer’s process specification if different. When determining the laser markability of wires, this shall be in accordance with EN 3475-706. Take a sample of the wire for marking. Before marking the wire ensure that the wire surface is clean and dry and free from dust and dirt; if necessary wipe it clean using propan-2-ol (isopropyl alcohol). The surfaces of the samples shall be clean and without damage. The identification markings to be measured shall be even in colour and characters shall have well defined edges. Before starting measurements clean the surfaces with a soft, lint-free cloth, if required, to avoid distortion of test results by a roughened surface or “deposits”.
EN 3475-705:2005 (E) 6 5 Apparatus, measurement and process 5.1 Apparatus 5.1.1 Components of the measuring device The measuring device shall comprise, at a minimum, a photometer, an illumination system and a purpose designed sample holder suitable for wire and cable. The whole system shall be designed to ensure that test results are not falsified by external influences. The photometer shall be designed to be stable and free from v
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