SIST EN 2591-703:2004

• Abstract:

  This standard specifies a method of measuring common mode rejection of couplers.; It shall be used together with EN 2591-100.

• Status: Published
• Publication Date: 30-Apr-2004
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: I08 - Imaginarni 08
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2004
• Due Date: 01-May-2004
• Completion Date: 01-May-2004
• Ref Project: EN 2591-703:2001 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 703: Electrical elements - Common mode rejection of couplers

• Refers: SIST EN 2591-100:2024 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 100: General
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-076:2020 - Aerospace series - Electrical contacts used in elements of connection - Part 076: Contacts, electrical, male, type A, crimp, class R - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3660-012:2008 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 012: Grommet nut, style A for EN 3372 - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-024:2009 - Aerospace series - Electrical contacts used in elements of connection - Part 024: Contacts, electrical, triaxial, size 8, male, type D, crimp, class S - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-071:2019 - Aerospace series - Electrical contacts used in elements of connection - Part 071: Contacts, electrical, female, type A, crimp, class S - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 4644-001:2012 - Aerospace series - Connector, electrical and optical, rectangular, modular, rectangular inserts, operating temperature 175 °C (or 125 °C) continuous - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3660-004:2023 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 004: Cable outlet, style A, straight, unsealed with clamp strain relief - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-077:2020 - Aerospace series - Electrical contacts used in elements of connection - Part 077: Contacts, electrical, female, type A, crimp, class R - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-076:2012 - Aerospace series - Electrical contacts used in elements of connection - Part 076: Contacts, electrical, male, type A, crimp, class R - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 4639-102:2008 - Aerospace series - Connectors, optical, rectangular, modular, multicontact, 1,25 diameter ferrule, with removable alignment sleeve holder - Part 102: Optical contact for cable EN 4641-102 - Operating temperatures between - 55 °C and 100 °C - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3646-001:2009 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-081:2019 - Aerospace series - Electrical contacts used in elements of connection - Part 081: Contacts size 22 for EN 2997, electrical, female, type A, crimp, class T - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-071:2008 - Aerospace series - Electrical contacts used in elements of connection - Part 071: Contacts, electrical, female, type A, crimp, class S - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-017:2009 - Aerospace series - Electrical contacts used in elements of connection - Part 017: Contacts, electrical, relay base, female, type A, crimp, class P - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-027:2019 - Aerospace series - Electrical contacts used in elements of connection - Part 027: Contacts, electrical, female, type A, crimp, class R - Product standard
• Effective Date: 28-Jan-2026

Overview

EN 2591-703:2001 is a CEN / AECMA aerospace test-method standard that specifies how to measure common mode rejection (CMR) of electrical couplers used in aerospace electrical and optical connection systems. It is part of the EN 2591 series of test methods and is intended to be used together with EN 2591-100 (General) to ensure consistent specimen preparation and test conditions.

Key topics and requirements

• Scope: Defines a bench method to measure the CMR of couplers (electrical elements).
• Test setup: The coupler is connected as shown in the standard’s figure (signal generator feeding a bus and a stub). Test parameters that must be recorded include:
  • Specified value of T (the CMR target) as given in the technical specification
  • Stub and bus cable length (L1)
  • Test temperature
• Test signal: Sinusoidal waveform at 1 MHz, amplitude 0.3 V r.m.s.
• Calculation: Common mode rejection is calculated per the formula provided in the standard (the test method prescribes how to derive T from measured signals).
• Compliance: Measured CMR must meet the value specified in the applicable technical specification for the coupler under test.

Practical applications

• Verifying signal integrity and immunity to common-mode noise for couplers used in avionics wiring and data buses.
• Supporting qualification and acceptance testing of electrical connection elements in aircraft systems.
• Providing test evidence for supplier quality control, procurement specifications, and conformity assessment.
• Comparing coupler designs during product development to ensure adequate common-mode noise suppression.

Who uses this standard

• Aerospace manufacturers and systems integrators (avionics, communication systems)
• Component and cable harness suppliers
• Test laboratories performing electrical tests on aerospace connectors and couplers
• Quality assurance and certification teams responsible for compliance with aerospace electrical standards
• Design and validation engineers focused on electromagnetic compatibility (EMC) and signal performance

Related standards

• EN 2591-100 (must be used together with EN 2591-703) - general requirements and specimen preparation for the EN 2591 test series.
• AECMA documents referenced within EN 2591-series test methods.

Keywords: EN 2591-703, common mode rejection, couplers, aerospace standard, test method, signal integrity, avionics, electrical connection, CMR measurement.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Elements of electrical and optical connection - Test methods - Part 703: Electrical elements - Common mode rejection of couplersLuft- und Raumfahrt - Elektrische und optische Verbindungselemente - Prüfverfahren - Teil 703: Elektrische Elemente - Gleichtaktunterdrückung von KopplernSérie aérospatiale - Organes de connexion électrique et optique - Méthodes d'essais - Partie 703 : Organes électriques - Réjection de mode commun des coupleursAerospace series - Elements of electrical and optical connection - Test methods - Part 703: Electrical elements - Common mode rejection of couplers49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 2591-703:2001SIST EN 2591-703:2004en01-maj-2004SIST EN 2591-703:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 2591-703November 2001ICS 49.060English versionAerospace series - Elements of electrical and optical connection- Test methods - Part 703: Electrical elements - Common moderejection of couplersSérie aérospatiale - Organes de connexion électrique etoptique - Méthodes d'essais - Partie 703: Organesélectriques - Réjection de mode commun des coupleursLuft- und Raumfahrt - Elektrische und optischeVerbindungselemente - Prüfverfahren - Teil 703:Elektrische Elemente - Gleichtaktunterdrückung vonKopplernThis European Standard was approved by CEN on 4 June 2001.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 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of
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