EN 3745-705:2007
(Main)Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 705: Contrast measurement
Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 705: Contrast measurement
This standard specifies the process to be applied for measuring different colour densities of cable identification markings. It is designed to define a reproducible process of contrast value determination.
Luft- und Raumfahrt - Faseroptische Leitungen für Luftfahrzeuge - Prüfverfahren - Teil 705: Kontrastmessung
Série aérospatiale - Fibres et câbles optiques à usage aéronautique - Méthodes d'essais - Partie 705 : Mesure de contraste
Aeronavtika - Optična vlakna in kabli za uporabo v zračnih plovilih - Preskusne metode - 705. del: Meritev kontrasta
General Information
- Status
- Published
- Publication Date
- 11-Dec-2007
- Withdrawal Date
- 29-Jun-2008
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 4 - Metallic
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 30-Jun-2017
- Completion Date
- 28-Jan-2026
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 3745-705:2007 (CEN) defines a reproducible process to measure contrast between cable identification markings and the cable surface for aircraft optical fibres and cables. The standard is intended to support consistent color-density determination, repeatable test results and product conformity by specifying sample preparation, test equipment, lighting geometry and calculation of contrast values.
This method is focused on practical quality control needs in aerospace cable manufacturing and inspection, providing a documented approach for objective contrast measurement.
Key Topics
Scope and objective: Measure different colour densities of cable identification markings to derive a reproducible contrast value between marking and cable surface.
Sample preparation:
- Markings shall be applied per manufacturing instruction and the specified power density.
- Cable surfaces must be clean, undamaged and free from deposits. Use a soft, lint-free cloth for cleaning.
- Markings must be even in colour with sharply defined edges and correct focus.
Test equipment and setup:
- The measuring device comprises a photometer, lighting equipment and a cable handling device designed to eliminate external light and vibrations.
- Handling fixtures and accessories should be matt black to absorb scattered light.
- Photometer sensitivity and work range must conform to CIE guidance (CIE 15 / ISO 7724-1 references).
- The diameter of the measuring spot must not exceed 75% of the marking size (X and Y). Photometer tolerance: < 2%.
- Photometer calibration is performed by the manufacturer; calibration intervals follow manufacturer guidelines.
Lighting:
- Two identical light sources illuminate a centred spot at an angle of 45°; lamps are mounted in pairs and exchanged together.
- Lamps must be gas-filled with tungsten filaments and have a colour temperature of (3000 ± 500) K. Voltage supply should be stabilized against line fluctuations.
Measurement procedure and calculation:
- Measurements must be taken rapidly to avoid sample heating; allow cooling if necessary.
- Position photometer vertically at the centre of the marking. Avoid areas with additional printing, overlaps or surface irregularities.
- Take illuminance readings of the marking (Lmin or Lmark) and of the adjacent cable surface (Lmax) at distances greater than the measuring spot diameter.
- Contrast is calculated as:
K = 100 × (Lmax − Lmin) / Lmax - The reported contrast value is the average of four individual measurements.
Applications
- Production and inspection of aircraft optical fibres and cables to ensure readable and compliant cable identification.
- Quality control, batch acceptance testing and traceability during manufacture and assembly.
- Supporting product standards that specify minimum contrast requirements for marking legibility.
Related Standards
- ISO 7724-1 (Paints and varnishes - Colorimetry - Principles)
- CIE 15 (Colorimetry)
These normative references guide photometer performance and colorimetry principles used by EN 3745-705:2007.
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Frequently Asked Questions
EN 3745-705:2007 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 705: Contrast measurement". This standard covers: This standard specifies the process to be applied for measuring different colour densities of cable identification markings. It is designed to define a reproducible process of contrast value determination.
This standard specifies the process to be applied for measuring different colour densities of cable identification markings. It is designed to define a reproducible process of contrast value determination.
EN 3745-705:2007 is classified under the following ICS (International Classification for Standards) categories: 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3745-705:2007 has the following relationships with other standards: It is inter standard links to EN 14432:2006, EN 4641-102:2009, EN 4641-103:2025, EN 4641-102:2025, EN 4641-202:2018, EN 4641-301:2024, EN 4641-200:2018, EN 4641-101:2015, EN 4641-401:2024, EN 4641-106:2018, EN 4532:2009, EN 4641-100:2015, EN 4641-201:2018, EN 4641-301:2022, EN 4641-301:2011. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3745-705:2007 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 705: Contrast measurementSérie aérospatiale - Fibres et câbles optiques à usage aéronautique - Méthodes d'essais - Partie 705 : Mesure de contrasteLuft- und Raumfahrt - Faseroptische Leitungen für Luftfahrzeuge - Prüfverfahren - Teil 705: KontrastmessungTa slovenski standard je istoveten z:EN 3745-705:2007SIST EN 3745-705:2008en49.060ICS:SLOVENSKI
STANDARDSIST EN 3745-705:200801-marec-2008
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3745-705December 2007ICS 49.060 English VersionAerospace series - Fibres and cables, optical, aircraft use - Testmethods - Part 705: Contrast measurementSérie aérospatiale - Fibres et câbles optiques à usageaéronautique - Méthodes d'essais - Partie 705 : Mesure decontrasteLuft- und Raumfahrt - Faseroptische Leitungen fürLuftfahrzeuge - Prüfverfahren - Teil 705: KontrastmessungThis European Standard was approved by CEN on 25 July 2007.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 CEN Management Centre 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 CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, 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© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-705:2007: E
1 Scope This standard specifies the process to be applied for measuring different colour densities of cable identification markings. It is designed to define a reproducible process of contrast value de
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