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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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