EN IEC 61265:2018
(Main)Electroacoustics - Instruments for measurement of aircraft noise - Performance requirements for systems to measure sound pressure levels in noise certification of aircraft
Electroacoustics - Instruments for measurement of aircraft noise - Performance requirements for systems to measure sound pressure levels in noise certification of aircraft
IEC 61265:2018 specifies requirements for the electroacoustical performance of systems of instruments used to measure sound for the purposes of aircraft noise certification, and for other comparisons among aircraft models, and provides methods by which tests can be made periodically to verify that the performance continues to conform to the requirements within stated limits. In general, a sound measurement system for this purpose comprises a combination of instruments extending from a microphone, including its windscreen and other accessories, through data recording and processing devices to a suitable output. Different measurement systems, regardless of their composition, perform the necessary functions in different ways and operate on either analogue or digital principles. IEC 61265:2018 cancels and replaces the first edition published in 1995. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) addition of guidance for measurements for aircraft other than large transport aeroplanes; b) addition of microphones used in ground plane measurement systems; c) addition of weighted sound level measurements other than one-third-octave band measurements, for certain aircraft types; d) revision and clarification of requirements for digital audio recording; e) addition of requirements for evaluation of measurement uncertainty.
Elektroakustik - Geräte zur Messung des Geräuschs von Luftfahrzeugen - Anforderungen an die Eigenschaften von Systemen zur Messung von Schalldruckpegeln bei der Zertifizierung von Luftfahrzeugen
Électroacoustique - Instruments pour la mesure du bruit des aéronefs - Exigences relatives aux systèmes de mesure des niveaux de pression acoustique pour la certification acoustique des aéronefs
IEC 61265:2018 spécifie les caractéristiques électroacoustiques des systèmes instrumentaux utilisés pour la mesure des bruits dans le cadre de la certification acoustique des aéronefs, ainsi que pour l'établissement d'autres comparaisons entre des modèles d'aéronefs, et fournit des méthodes d'essais de vérification périodique qui permettent de s'assurer du maintien des caractéristiques en conformité avec les exigences, à l'intérieur de tolérances spécifiées. En général, un système de mesure utilisé à cet effet se compose d'une combinaison d'instruments allant du microphone, y compris son écran anti-vent et ses autres accessoires, en passant par des dispositifs d'enregistrement et de traitement des données, jusqu'à un dispositif de sortie approprié. Les différents systèmes de mesure, indépendamment de leur composition, réalisent les fonctions nécessaires de différentes façons et fonctionnent suivant des principes analogiques ou numériques. IEC 61265:2018 annule et remplace la première édition parue en 1995. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) ajout de recommandations pour les mesures d'aéronefs autres que des gros avions de transport; b) ajout de microphones utilisés dans les systèmes de mesure à plan de sol; c) ajout de mesures de niveau acoustique pondéré, autres que les mesures par bandes de tiers d'octave, pour certains types d'aéronefs; d) révision et clarification des exigences applicables à l'enregistrement audio numérique; e) ajout d'exigences pour l'évaluation de l'incertitude de mesure.
Elektroakustika - Instrumenti za merjenje hrupa zrakoplova - Zahteve za delovanje sistemov za merjenje zvočnega tlaka pri certificiranju hrupa zrakoplova (IEC 61265:2018)
Ta dokument določa zahteve za elektroakustično zmogljivost sistemov instrumentov, ki se uporabljajo za merjenje zvoka pri certificiranju hrupa zrakoplova in za druge primerjave med modeli zrakoplovov, ter določa metode, s katerimi je mogoče redno izvajati preskuse, s katerimi se preverja, ali zmogljivost še naprej ustreza zahtevam.
Na splošno sistem za merjenje zvoka za ta namen obsega kombinacijo instrumentov, ki zajema vse od mikrofona, vključno z njegovimi filtri in drugimi dodatki, do naprav za zapisovanje in obdelavo podatkov na ustrezen izhod. Različni merilni sistemi, ne glede na sestavo, opravljajo potrebne funkcije na različne načine in delujejo s pomočjo analognih ali digitalnih načel.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2018
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SIST EN 61265:2002
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Electroacoustics - Instruments for measurement of aircraft noise - Performance
requirements for systems to measure sound pressure levels in noise certification of
aircraft (IEC 61265:2018)
Ta slovenski standard je istoveten z: EN IEC 61265:2018
ICS:
17.140.50 Elektroakustika Electroacoustics
49.020 Letala in vesoljska vozila na Aircraft and space vehicles in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 61265
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2018
ICS 17.140.50; 49.020 Supersedes EN 61265:1995
English Version
Electroacoustics - Instruments for measurement of aircraft noise
- Performance requirements for systems to measure sound
pressure levels in noise certification of aircraft
(IEC 61265:2018)
Électroacoustique - Instruments pour la mesure du bruit des Elektroakustik - Geräte zur Messung des Geräuschs von
aéronefs - Exigences relatives aux systèmes de mesure Luftfahrzeugen - Anforderungen an die Eigenschaften von
des niveaux de pression acoustique pour la certification Systemen zur Messung von Schalldruckpegeln bei der
acoustique des aéronefs Zertifizierung von Luftfahrzeugen
(IEC 61265:2018) (IEC 61265:2018)
This European Standard was approved by CENELEC on 2018-06-12. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61265:2018 E
European foreword
The text of document 29/958/CDV, future edition 2 of IEC 61265, prepared by IEC/TC 29
"Electroacoustics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
(dop) 2019-03-12
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-06-12
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61265:1995.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61265:2018 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 61094-4 NOTE Harmonized as EN 61094-4.
IEC 61326-1:2012 NOTE Harmonized as EN 61326-1:2013 (not modified).
IEC 61000-4-2 NOTE Harmonized as EN 61000-4-2.
IEC 61000-4-3 NOTE Harmonized as EN 61000-4-3.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60942 - Electroacoustics - Sound calibrators EN IEC 60942 -
IEC 61260-1 - Electroacoustics - Octave-band and EN 61260-1 -
fractional-octave-band filters -
Part 1: Specifications
IEC 61672-1 - Electroacoustics - Sound level meters - EN 61672-1 -
Part 1: Specifications
IEC 61265 ®
Edition 2.0 2018-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Instruments for measurement of aircraft noise – Performance
requirements for systems to measure sound pressure levels in noise
certification of aircraft
Électroacoustique – Instruments pour la mesure du bruit des aéronefs –
Exigences relatives aux systèmes de mesure des niveaux de pression
acoustique pour la certification acoustique des aéronefs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50; 49.020 ISBN 978-2-8322-5695-4
– 2 – IEC 61265:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Purpose . 11
5 Requirements . 12
5.1 General . 12
5.1.1 Output data . 12
5.1.2 Time-pressure history . 12
5.1.3 Measurements of sound from aircraft ground power units . 12
5.1.4 Measurements of aircraft operations on the ground . 12
5.2 Measurement uncertainty . 12
5.2.1 Relationship with regulatory requirements . 12
5.2.2 Performance verification . 13
5.2.3 Periodic tests . 13
5.3 Reference environmental conditions . 13
5.4 Sound calibrator. 13
5.5 Microphone system . 13
5.5.1 Pressure and free-field type microphones . 13
5.5.2 Grazing incidence microphone configuration . 14
5.5.3 Ground plane microphone configuration . 15
5.5.4 Measurement configurations . 16
5.6 Measurement system exclusive of the microphone . 16
5.6.1 Frequency response . 16
5.6.2 Level linearity . 16
5.6.3 Floating-range measurement systems . 17
5.7 Spectrum analysis system . 17
5.7.1 Third-octave analysis . 17
5.7.2 Time constants . 17
5.7.3 Time offset . 17
5.7.4 Anti-aliasing. 18
5.8 Readout device resolution . 18
5.9 Sensitivity to various environments . 18
5.9.1 General . 18
5.9.2 Atmospheric pressure . 18
5.9.3 Air temperature . 18
5.9.4 Humidity . 19
5.9.5 Electromagnetic compatibility . 19
Annex A (informative) Methods of testing the electroacoustical performance of a
measurement system . 20
A.1 General . 20
A.2 Operating conditions for test . 20
A.3 Sound calibrator. 20
IEC 61265:2018 © IEC 2018 – 3 –
A.4 Microphone system frequency response . 20
A.5 Frequency response of the measurement system exclusive of the
microphone . 21
A.6 Linear operating range of the measurement system exclusive of the
microphone . 21
A.7 Spectrum analysis system . 21
Annex B (informative) Relationship between tolerance interval, corresponding
acceptance interval and the maximum permitted uncertainty of measurement . 22
Bibliography . 24
Figure 1 – Illustration of sound incidence angles from the principal axis of the
microphone . 15
Figure B.1 – Relationship between tolerance interval, corresponding acceptance
interval and the maximum permitted uncertainty of measurement . 22
Table 1 – ICAO measurement protocols (informative) . 11
Table 2 – Maximum difference between the free-field sensitivity level of a microphone
used in grazing-incidence microphone configuration at normal incidence and at
specified sound incidence angles . 15
– 4 – IEC 61265:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS – INSTRUMENTS FOR MEASUREMENT OF
AIRCRAFT NOISE – PERFORMANCE REQUIREMENTS FOR
SYSTEMS TO MEASURE SOUND PRESSURE LEVELS
IN NOISE CERTIFICATION OF AIRCRAFT
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to oth
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