EN ISO 11904-2:2021

SLOVENSKI STANDARD
01-julij-2021
Nadomešča:
SIST EN ISO 11904-2:2005
Akustika - Ugotavljanje imisije zvoka iz zvočnih virov v neposredni bližini ušesa -
2. del: Uporaba lutke (ISO 11904-2:2021)
Acoustics - Determination of sound immission from sound sources placed close to the
ear - Part 2: Technique using a manikin (ISO 11904-2:2021)
Akustik - Bestimmung der Schallimmission von ohrnahen Schallquellen - Teil 2:
Verfahren unter Verwendung eines Kopf- und Rumpfsimulators (ISO 11904-2:2021)
Acoustique - Détermination de l'exposition sonore due à des sources placées à proximité
de l'oreille - Partie 2: Technique utilisant un mannequin (ISO 11904-2:2021)
Ta slovenski standard je istoveten z: EN ISO 11904-2:2021
ICS:
17.140.01 Akustična merjenja in Acoustic measurements and
blaženje hrupa na splošno noise abatement in general
33.160.50 Pribor Accessories
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11904-2
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 13.140 Supersedes EN ISO 11904-2:2004
English Version
Acoustics - Determination of sound immission from sound
sources placed close to the ear - Part 2: Technique using a
manikin (ISO 11904-2:2021)
Acoustique - Détermination de l'exposition sonore due Akustik - Bestimmung der Schallimmission von
à des sources placées à proximité de l'oreille - Partie 2: ohrnahen Schallquellen - Teil 2: Verfahren unter
Technique utilisant un mannequin (ISO 11904-2:2021) Verwendung eines Kopf- und Rumpfsimulators (ISO
11904-2:2021)
This European Standard was approved by CEN on 9 March 2021.

CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11904-2:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11904-2:2021) has been prepared by Technical Committee ISO/TC 43
"Acoustics" in collaboration with Technical Committee CEN/TC 211 “Acoustics” the secretariat of which
is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2021, and conflicting national standards
shall be withdrawn at the latest by September 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11904-2:2004.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 11904-2:2021 has been approved by CEN as EN ISO 11904-2:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 11904-2
Second edition
2021-03
Acoustics — Determination of sound
immission from sound sources placed
close to the ear —
Part 2:
Technique using a manikin
Acoustique — Détermination de l'exposition sonore due à des sources
placées à proximité de l'oreille —
Partie 2: Technique utilisant un mannequin
Reference number
ISO 11904-2:2021(E)
©
ISO 2021
ISO 11904-2:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
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Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 11904-2:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measurement principle . 2
5 Instrumentation . 3
5.1 Manikin (head and torso simulator) . 3
5.2 Check of calibration . 3
5.3 Filters . 3
6 Determination of free-field or diffuse-field related equivalent continuous
A-weighted sound pressure level . 3
6.1 Measurement of manikin sound pressure level . 3
6.2 Conversion to free-field or diffuse-field related sound pressure level . 4
6.3 A-weighting and summation . 6
7 Test report . 6
Annex A (informative) Examples of sources of measurement uncertainty .7
Annex B (informative) Example of an uncertainty analysis .14
Bibliography .16
ISO 11904-2:2021(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 43, Acoustics in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 211, Acoustics, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 11904-2:2004), of which it constitutes a
minor revision. The changes compared to the previous edition are editorial.
A list of all parts in the ISO 11904 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved

ISO 11904-2:2021(E)
Introduction
ISO 11904 is a series of standards which specify methods for the determination of sound immissions
from sources located close to the ear in which situations the sound pressure level measured at the
position of the exposed person (but with the person absent) does not adequately represent the sound
exposure.
In order to make it possible to assess the exposure by means of well-established criteria, the exposure
of the ear is measured and subsequently converted into a corresponding free-field or diffuse-field level.
The result is given as a free-field related or diffuse-field related equivalent continuous A-weighted
sound pressure level, L or L when ISO 11904-1 is used, or L or L when
FF,H,Aeq DF,H,Aeq FF,M,Aeq DF,M,Aeq
ISO 11904-2 is used.
ISO 11904-1 describes measurements carried out using miniature or probe microphones inserted in the
ears of human subjects (microphones in real ear, MIRE technique). ISO 11904-2 describes measurements
carried out using a manikin equipped with ear simulators including microphones (manikin technique).
ISO 11904 may, for instance, be applied to equipment tests and the determination of noise exposure
at the workplace where, in the case of exposure from sources close to the ears, the sound pressure
level measured at the position of the exposed person (but with the person absent) does not adequately
represent the sound exposure. Examples of applications are head- and earphones used to reproduce
music or speech, whether at the workplace or during leisure, nail guns used close to the head, and
combined exposure from a close-to-ear sound source and an external sound field.
When specific types of equipment are to be tested (e.g. portable cassette players or hearing protectors
provided with radio receivers), test signals suitable for this particular type of equipment have to be
used. Neither such test signals nor the oper
...