SIST EN 2591-704:2004

• Abstract:

  This standard specifies a method of measuring the turns ratio of a transformer used in a coupler. This method allows also for verification of the input and output voltage phase.; 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 2591-704:2001 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 704: Electrical elements - Measurement of turns ratio on a transformer used in a coupler

• 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 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 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 3155-071:2008 - 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

SIST EN 2591-704:2004 is the Slovenian adoption of EN 2591-704:2001 for aerospace electrical and optical connection elements. It specifies a test method for measuring the turns ratio of a transformer used in a coupler, and it also allows verification of the input and output voltage phase. The document is used with EN 2591-100.

What does SIST EN 2591-704:2004 specify?

SIST EN 2591-704:2004 specifies one test method for a transformer used in a coupler, with the aim of measuring turns ratio and checking voltage phase. In practice, it gives a common way to test that component so different laboratories can obtain comparable results.

The document is organized into short clauses:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Preparation of specimens
• Clause 4 - Method
• Clause 5 - Requirements

Clause 1 sets the subject of the test, while Clause 3 and Clause 4 describe how to prepare and run it. Clause 5 states what the result has to satisfy.

What are the key requirements of SIST EN 2591-704:2004?

SIST EN 2591-704:2004 requires the test to be carried out together with EN 2591-100. That means the general rules in the companion method apply here as well, so users should read both documents before testing.

Specimen preparation

Clause 3 says that, unless the technical specification says otherwise, the test record shall state the value of N and the test temperature. In practice, the lab must identify the target turns ratio and the temperature condition before the measurement starts.

Test arrangement

Clause 4 requires a signal generator and an oscilloscope connected as shown in the figure. This tells the user how to build the setup and what instruments are needed to observe the transformer response.

Test signal

Clause 4 specifies a sinusoidal test signal at 250 kHz and 10 V peak to peak. In practice, the test is run under a fixed electrical condition, so the measured turns ratio is based on the same stimulus every time.

Turns ratio calculation

Clause 4 gives a formula for calculating the turns ratio from the measured voltages V1 and V2. For the user, this means the result is not estimated visually - it is derived from the measured input and output voltages.

Acceptance criteria

Clause 5 requires N to comply with the value stated in the technical specification. It also requires V1 and V2 to be in phase. That means the component has to meet both the ratio value and the phase relationship expected by the product definition.

What terms does SIST EN 2591-704:2004 define?

SIST EN 2591-704:2004 uses a small set of technical terms that matter to the test.

• Turns ratio - the ratio between the transformer voltages used to judge whether the coupler transformer behaves as specified.
• Transformer - the electrical component being tested in the coupler.
• Coupler - the assembly that contains the transformer and is the subject of this measurement method.
• Signal generator - the instrument used to apply the sinusoidal test signal.
• Oscilloscope - the instrument used to observe V1 and V2 during the test.
• Technical specification - the product document that states the required value of N for the item under test.
• V1 and V2 - the input and output voltages used in the calculation and phase check.

Who uses SIST EN 2591-704:2004?

SIST EN 2591-704:2004 is used by organizations working with aerospace electrical and optical connection elements, especially where a transformer is used in a coupler. Engineers, test laboratories, and quality staff use it to measure turns ratio in a repeatable way and to verify phase during product testing.

It is also relevant for suppliers who need to show that their coupler transformers meet a technical specification. For buyers and inspectors, it provides a named method to refer to when defining or checking acceptance criteria.

What changed in SIST EN 2591-704:2004 from the previous edition?

SIST EN 2591-704:2004 is the Slovenian adoption of EN 2591-704:2001 and is identified as the same standard content in another national publication form.

Which standards are used with SIST EN 2591-704:2004?

SIST EN 2591-704:2004 is used with EN 2591-100. EN 2591-100 provides the general test-method provisions that apply to this measurement method.

What does the SIST EN 2591-704:2004 document contain?

SIST EN 2591-704:2004 contains a concise test method, one figure showing the signal-generator, coupler, and oscilloscope arrangement, and a calculation formula for turns ratio. It also states the required test signal conditions and the acceptance check for phase.

The document is aimed at laboratory use rather than design theory. Its main value is giving a repeatable measurement setup and clear pass-fail criteria for the transformer used in a coupler.

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 704: Electrical elements - Measurement of turns ratio on a transformer used in a couplerLuft- und Raumfahrt - Elektrische und optische Verbindungselemente - Prüfverfahren - Teil 704: Elektrische Elemente - Messung des Windungsverhältnisses eines Koppelübertragers in einem KopplerSérie aérospatiale - Organes de connexion électrique et optique - Méthodes d'essais - Partie 704 : Organes électriques - Mesure du rapport des spires sur un transformateur utilisé dans un coupleurAerospace series - Elements of electrical and optical connection - Test methods - Part 704: Electrical elements
- Measurement of turns ratio on a transformer used in a coupler49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 2591-704:2001SIST EN 2591-704:2004en01-maj-2004SIST EN 2591-704:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 2591-704November 2001ICS 49.060English versionAerospace series - Elements of electrical and optical connection- Test methods - Part 704: Electrical elements - Measurement ofturns ratio on a transformer used in a couplerSérie aérospatiale - Organes de connexion électrique etoptique - Méthodes d'essais - Partie 704: Organesélectriques - Mesure du rapport des spires sur untransformateur utilisé dans un coupleurLuft- und Raumfahrt - Elektrische und optischeVerbindungselemente - Prüfverfahren - Teil 704:Elektrische Elemente - Messung desWindungsverhältnisses eines Koppelübertragers in einemKopplerThis 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
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