Acoustics - Noise emitted by machinery and equipment - Determination of emission sound pressure levels at a work station and at other specified positions applying accurate environmental corrections (ISO 11204:2010)

This International Standard specifies a method for determining the emission sound pressure levels of machinery or equipment, at a work station and at other specified positions nearby, in any environment which meets certain qualification requirements. A work station is occupied by an operator and may be located in open space, in the room where the source under test operates, in a cab fixed to the source under test, or in an enclosure remote from the source under test. One or more specified positions may be located in the vicinity of a work station, or in the vicinity of an attended or unattended machine. Such positions are sometimes referred to as bystander positions. Emission sound pressure levels are determined as A-weighted levels. Additionally, levels in frequency bands and C-weighted peak emission sound pressure levels can be determined in accordance with this International Standard, if required.

Akustik - Geräuschabstrahlung von Maschinen und Geräten - Messung von Emissions-Schalldruckpegeln am Arbeitsplatz und an anderen festgelegten Orten unter Anwendung exakter Umgebungskorrekturen (ISO 11204:2010)

Diese Internationale Norm legt ein Verfahren zur Bestimmung der Emissions-Schalldruckpegel von
Maschinen oder Geräten am Arbeitsplatz und an anderen, sich in der Nähe befindenden, festgelegten Orten
in einer beliebigen Umgebung fest, die bestimmte Eignungskriterien erfüllt. Ein Arbeitsplatz wird von einer
Bedienungsperson eingenommen; er kann sich im Freien, in einem Raum, in dem die untersuchte Quelle
betrieben wird, in einer Kabine, die fest mit der untersuchten Quelle verbunden ist, oder in einem von der
untersuchten Quelle entfernt liegenden Bedienerstand befinden. Einer oder mehrere der festgelegten Orte
können im Umgebung eines Arbeitsplatzes oder im Umfeld einer bedienten oder unbeaufsichtigt betriebenen
Maschine liegen. Derartige Orte werden gelegentlich als „Nachbararbeitsplätze“ bezeichnet.
Emissions-Schalldruckpegel werden als A-bewertete Pegel bestimmt. Falls erforderlich, können zusätzlich
Pegel in Frequenzbändern und C-bewertete Emissions-Spitzenschalldruckpegel nach dieser Internationalen
Norm ermittelt werden.
ANMERKUNG 1 Der Inhalt der Normreihe ISO 11200 [15] bis ISO 11205 [19] ist in ISO 11200 [15] zusammengefasst.
Es wird ein Verfahren zur Bestimmung einer punktbezogenen Umgebungskorrektur (bis hin zu einem festgelegten
maximalen Grenzwert) angegeben, die auf die gemessenen Schalldruckpegel anzuwenden ist, um den
Einfluss aller anderen Reflexionsflächen als der Ebene, auf der die untersuchte Quelle aufgestellt ist, zu
eliminieren. Dieser Korrekturwert geht vom mittleren Schalldruckpegel auf einer Messfläche, dem an einem
festgelegten Ort gemessenen Schalldruckpegel und entweder einer Umgebungskorrektur oder der äquivalenten
Absorptionsfläche des Prüfraumes aus.
Mit dem in dieser Internationalen Norm festgelegten Verfahren werden Ergebnisse der Genauigkeitsklasse 2
oder der Genauigkeitsklasse 3 erzielt. Korrekturen werden bezüglich des Fremdgeräuschs und, wie oben
beschrieben, bezüglich der akustischen Umgebung vorgenommen.

Acoustique - Bruit émis par les machines et équipements - Mesurage des niveaux de pression acoustique d'émission au poste de travail et en d'autres positions spécifiées en appliquant des corrections d'environnement exactes (ISO 11204:2010)

L'ISO 11204:2010 spécifie une méthode de détermination des niveaux de pression acoustique d'émission des machines et des équipements au poste de travail et en d'autres positions spécifiées proches, dans un quelconque environnement satisfaisant à certaines exigences de qualification. Le poste de travail occupé par un opérateur peut être situé dans un espace ouvert dans la salle où la source soumise à essai fonctionne, dans une cabine fixée à la source soumise à essai ou dans une enceinte située à distance de la source soumise à essai. Une ou plusieurs positions spécifiées peuvent se situer au voisinage du poste de travail ou d'une machine avec ou sans opérateur. Ces positions sont parfois appelées «positions d'assistant».
Les niveaux de pression acoustique d'émission sont déterminés en tant que niveaux pondérés A. En outre, les niveaux par bandes de fréquence et les niveaux de pression acoustique d'émission de crête pondérés C peuvent être déterminés selon l'ISO 11204:2010, si nécessaire.
Des méthodes sont fournies pour déterminer la correction locale d'environnement (soumise à une valeur limite maximale spécifiée) à appliquer aux niveaux de pression acoustique mesurés afin d'éliminer l'influence des surfaces réfléchissantes autres que le plan sur lequel repose la source soumise à essai. Cette correction est fondée sur l'aire d'absorption acoustique équivalente de la salle d'essai et sur les caractéristiques de rayonnement (emplacement de la source ou directivité au poste de travail).
La méthode spécifiée dans l'ISO 11204:2010 permet d'obtenir des résultats de classe de précision 2 (classe expertise) ou de classe de précision 3 (classe contrôle). Des corrections sont appliquées pour le bruit de fond et comme décrit ci-dessus pour l'environnement acoustique. Des instructions sont fournies pour le montage et le fonctionnement de la source soumise à essai ainsi que pour le choix des positions du microphone pour le poste de travail et pour d'autres positions spécifiées. Un des objets des mesurages est de permettre la comparaison des performances de différentes unités d'une famille donnée de machines, dans des conditions d'environnement définies et dans des conditions de montage et de fonctionnement normalisées.
La méthode spécifiée dans l'ISO 11204:2010 s'applique à tous les types de bruits (continus, discontinus, fluctuants, pics d'énergie acoustique isolés, etc.) définis dans l'ISO 12001.
La méthode spécifiée dans l'ISO 11204:2010 s'applique à tous les types et toutes les tailles de sources de bruit.
Le type d'environnement d'essai affecte la précision de la détermination des niveaux de pression acoustique d'émission. Pour l'ISO 11204:2010, toute salle répondant aux exigences spécifiées est utilisable. Ces exigences relatives à la salle sont moins strictes que celles de l'ISO 11201, notamment en ce qui concerne la qualité acoustique de l'environnement.
L'ISO 11204:2010 s'applique aux postes de travail et aux autres positions spécifiées auxquels les niveaux de pression acoustique d'émission doivent être mesurés.
Les positions appropriées où les mesurages peuvent être effectués incluent les positions suivantes: a) poste de travail situé au voisinage de la source soumise à essai, ce qui est le cas de nombreuses machines industrielles et de nombreux appareils domestiques; b) poste de travail à l'intérieur d'une cabine faisant partie intégrante de la machine soumise à essai; ce qui est le cas de nombreux véhicules industriels et engins de terra

Akustika - Emisija hrupa naprav in opreme - Merjenje emisijske ravni zvočnega tlaka na delovnem mestu in na drugih opredeljenih mestih z uporabo natančnih popravkov zaradi okolja (ISO 11204:2010)

Ta mednarodni standard določa metodo merjenja emisijske ravni zvočnega tlaka strojev ali opreme na delovnem mestu in na drugih bližnjih opredeljenih mestih, v kateremkoli okolju, ki izpolnjuje določene zahteve za kvalifikacijo. Delovno mesto zaseda operater in je lahko locirano na prostem, v sobi, kjer vir, ki je preskušan, deluje, v kabini pritrjeni na vir, ki je preskušan, ali ograjenem prostoru, ki je oddaljen od vira, ki je preskušan. Ena ali več določeni pozicij je lahko lociranih v bližini delovnega mesta, ali v bližini nadzorovanega ali nenadzorovanega stroja. Takšne pozicije se včasih omenja kot gledalske pozicije. Stopnje emisij zvočnega tlaka so določene kot A-ovrednotene stopnje. Poleg tega, če je potrebno, se stopnje v frekvenčnih pasovih in stopenj C-ovrednotenih vrhov zvočnega tlaka lahko določijo v skladu s tem mednarodnim standardom.

General Information

Status
Published
Publication Date
13-Jun-2010
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-Jun-2010
Due Date
08-Aug-2010
Completion Date
14-Jun-2010

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SLOVENSKI STANDARD
SIST EN ISO 11204:2010
01-julij-2010
1DGRPHãþD
SIST EN ISO 11204:2009
$NXVWLND(PLVLMDKUXSDQDSUDYLQRSUHPH0HUMHQMHHPLVLMVNHUDYQL]YRþQHJD
WODNDQDGHORYQHPPHVWXLQQDGUXJLKRSUHGHOMHQLKPHVWLK]XSRUDERQDWDQþQLK
SRSUDYNRY]DUDGLRNROMD ,62
Acoustics - Noise emitted by machinery and equipment - Determination of emission

sound pressure levels at a work station and at other specified positions applying

accurate environmental corrections (ISO 11204:2010)
Akustik - Geräuschabstrahlung von Maschinen und Geräten - Messung von Emissions-

Schalldruckpegeln am Arbeitsplatz und an anderen festgelegten Orten unter Anwendung

exakter Umgebungskorrekturen (ISO 11204:2010)

Acoustique - Bruit émis par les machines et équipements - Mesurage des niveaux de

pression acoustique d'émission au poste de travail et en d'autres positions spécifiées en

appliquant des corrections d'environnement exactes (ISO 11204:2010)
Ta slovenski standard je istoveten z: EN ISO 11204:2010
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
SIST EN ISO 11204:2010 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 11204:2010
---------------------- Page: 2 ----------------------
SIST EN ISO 11204:2010
EUROPEAN STANDARD
EN ISO 11204
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2010
ICS 17.140.20 Supersedes EN ISO 11204:2009
English Version
Acoustics - Noise emitted by machinery and equipment -
Determination of emission sound pressure levels at a work
station and at other specified positions applying accurate
environmental corrections (ISO 11204:2010)

Acoustique - Bruit émis par les machines et équipements - Akustik - Geräuschabstrahlung von Maschinen und

Détermination des niveaux de pression acoustique Geräten - Bestimmung von Emissions-Schalldruckpegeln

d'émission au poste de travail et en d'autres positions am Arbeitsplatz und an anderen festgelegten Orten unter

spécifiées en appliquant des corrections d'environnement Anwendung exakter Umgebungskorrekturen (ISO

exactes (ISO 11204:2010) 11204:2010)
This European Standard was approved by CEN on 22 April 2010.

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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11204:2010: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 11204:2010
EN ISO 11204:2010 (E)
Contents Page

Foreword ..............................................................................................................................................................3

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 2006/42/EC .........................................................................................4

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SIST EN ISO 11204:2010
EN ISO 11204:2010 (E)
Foreword

This document (EN ISO 11204:2010) 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 DS.

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 November 2010, and conflicting national standards shall be withdrawn

at the latest by November 2010.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 11204:2009.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive.

For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.

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, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
Endorsement notice

The text of ISO 11204:2010 has been approved by CEN as a EN ISO 11204:2010 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 11204:2010
EN ISO 11204:2010 (E)
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC

This European Standard has been prepared under a mandate given to CEN by the European Commission

and the European Free Trade Association to provide a means of conforming to Essential Requirements of the

New Approach Directive 2006/42/EC on machinery.

Once this standard is cited in the Official Journal of the European Union under that Directive and has been

implemented as a national standard in at least one Member State, compliance with the normative clauses of

this standard confers, within the limits of the scope of this standard, a presumption of conformity with the

corresponding Essential Requirements of that Directive and associated EFTA regulations.

WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within

the scope of this standard.
---------------------- Page: 6 ----------------------
SIST EN ISO 11204:2010
INTERNATIONAL ISO
STANDARD 11204
Second edition
2010-05-15
Acoustics — Noise emitted by machinery
and equipment — Determination of
emission sound pressure levels at a work
station and at other specified positions
applying accurate environmental
corrections
Acoustique — Bruit émis par les machines et équipements —
Détermination des niveaux de pression acoustique d'émission au poste
de travail et en d'autres positions spécifiées en appliquant des
corrections d'environnement exactes
Reference number
ISO 11204:2010(E)
ISO 2010
---------------------- Page: 7 ----------------------
SIST EN ISO 11204:2010
ISO 11204:2010(E)
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ii © ISO 2010 – All rights reserved
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SIST EN ISO 11204:2010
ISO 11204:2010(E)
Contents Page

Foreword ............................................................................................................................................................iv

Introduction.........................................................................................................................................................v

1 Scope......................................................................................................................................................1

2 Normative references............................................................................................................................2

3 Terms and definitions ...........................................................................................................................3

4 Instrumentation .....................................................................................................................................7

5 Test environment...................................................................................................................................8

6 Measured quantities............................................................................................................................10

7 Quantities to be determined...............................................................................................................11

8 Mounting and operation of source under test..................................................................................11

9 Microphone positions .........................................................................................................................13

10 Measurements .....................................................................................................................................15

11 Measurement uncertainty...................................................................................................................17

12 Information to be recorded.................................................................................................................20

13 Test report............................................................................................................................................21

Annex A (normative) Environmental correction for a work station — Determination of the local

environmental correction, K .............................................................................................................23

Annex B (normative) Criteria for background noise for measurements in frequency bands ..................26

Annex C (informative) Guidance on the development of information on measurement uncertainty ......28

Annex D (informative) Principles of the methodology ..................................................................................34

Annex E (informative) Example of a test table...............................................................................................35

Bibliography......................................................................................................................................................36

© ISO 2010 – All rights reserved iii
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SIST EN ISO 11204:2010
ISO 11204:2010(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 11204 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.

This second edition cancels and replaces the first edition (ISO 11204:1995), which has been technically

revised. It also incorporates the Technical Corrigendum ISO 11204:1995/Cor.1:1997.

iv © ISO 2010 – All rights reserved
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SIST EN ISO 11204:2010
ISO 11204:2010(E)
Introduction

This International Standard specifies a method for determining the emission sound pressure levels at a work

station and at other well defined positions, in the vicinity of a machine or piece of equipment, in situ. It is one

[15] [19]

of a series (ISO 11200 to ISO 11205 ) which specifies various methods for determining the emission

sound pressure level at a work station and at other specified positions of a machine or equipment.

[15]

ISO 11200 gives guidance on the choice of the method to be used to determine the emission sound

pressure levels of machinery and equipment.
[16]

The method specified in this International Standard differs from those of ISO 11201 in determining and

[17]

applying a local environmental correction. It differs from ISO 11202 by using an exact measurement of

sound pressure levels on a reference measurement surface to determine the directivity of the sound radiation

of the machine under test. The acoustical properties of the room have to be determined to qualify the test

environment and to determine a correction for local environmental influences applied to the measured sound

pressure levels. With the method specified in this International Standard, results of accuracy grade 2

(engineering grade) or accuracy grade 3 (survey grade) are obtained.

The method specified in this International Standard is generally applicable in situ. No assumptions about the

directivity of the radiation or the source location are necessary, because this directivity is determined

measuring the sound pressure levels on an enveloping surface. The grade of accuracy of the procedure with

existing conditions can be qualified as engineering or survey.

In general, the emission sound pressure levels are less than or equal to those that occur when the machine is

operating in its normal surroundings. This is because the sound pressure levels are determined by excluding

the effects of background noise, as well as the effects of reflections other than those from the reflecting plane

on which the machine under test is placed. For determination or calculation of the sound pressure level at the

operator's position with the machine operating in a room, both sound power level and sound pressure level

are required (as well as information on the room properties or reflections and noise from other sound sources

or machines). A method of calculating the sound pressure levels in the vicinity of a machine operating alone in

[20]

a workroom is given in ISO/TR 11690-3 . Commonly observed differences are 1 dB to 5 dB, but in extreme

cases the difference may be even greater.
© ISO 2010 – All rights reserved v
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SIST EN ISO 11204:2010
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SIST EN ISO 11204:2010
INTERNATIONAL STANDARD ISO 11204:2010(E)
Acoustics — Noise emitted by machinery and equipment —
Determination of emission sound pressure levels at a work
station and at other specified positions applying accurate
environmental corrections
1 Scope
1.1 General

This International Standard specifies a method for determining the emission sound pressure levels of

machinery or equipment, at a work station and at other specified positions nearby, in any environment which

meets certain qualification requirements. A work station is occupied by an operator and may be located in

open space, in the room where the source under test operates, in a cab fixed to the source under test, or in an

enclosure remote from the source under test. One or more specified positions may be located in the vicinity of

a work station, or in the vicinity of an attended or unattended machine. Such positions are sometimes referred

to as bystander positions.

Emission sound pressure levels are determined as A-weighted levels. Additionally, levels in frequency bands

and C-weighted peak emission sound pressure levels can be determined in accordance with this International

Standard, if required.
[15] [19] [15]

NOTE 1 The contents of the series ISO 11200 to ISO 11205 are summarized in ISO 11200 .

A method is given for determining a local environmental correction (subject to a specified limiting maximum

value) to be applied to the measured sound pressure levels to exclude the effects of reflections from reflecting

surfaces other than the plane on which the source under test is placed. This correction is based upon the

mean sound pressure level on a measurement surface, the sound pressure level measured at a specified

position, and either an environmental correction or the equivalent absorption area of the test room.

With the method specified in this International Standard, results of accuracy grade 2 (engineering grade) or

accuracy grade 3 (survey grade) are obtained. Corrections are applied for background noise and, as

described above, for the acoustic environment. Instructions are given for the mounting and operation of the

source under test and for the choice of microphone positions for the work station and for other specified

positions. One purpose of the measurements is to permit comparison of the performance of different units of a

given family of machines, under defined environmental conditions and standardized mounting and operating

conditions.

NOTE 2 The data obtained can also be used for the declaration and verification of emission sound pressure levels as

[9]
specified in ISO 4871 .
1.2 Types of noise and noise sources

The method specified in this International Standard is suitable for all types of noise (steady, non-steady,

fluctuating, isolated bursts of sound energy, etc.) defined in ISO 12001.

The method specified in this International Standard is applicable to all types and sizes of noise sources.

NOTE Throughout this International Standard the words “machine” and “source under test” are used to represent

either a machine or a piece of equipment.
© ISO 2010 – All rights reserved 1
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SIST EN ISO 11204:2010
ISO 11204:2010(E)
1.3 Test environment

The type of test environment influences the accuracy of the determination of emission sound pressure levels.

This International Standard is applicable to an indoor or outdoor environment with one or more reflecting

planes present, meeting specified requirements. These requirements on the room are less strict than those of

[16]
ISO 11201 , in particular regarding the acoustical quality of the environment.
1.4 Work station and other specified positions

This International Standard is applicable to work stations and other specified positions where emission sound

pressure levels are to be determined.
Appropriate positions where measurements may be made include the following:

a) work station located in the vicinity of the source under test; this is the case for many industrial machines

and domestic appliances;

b) work station within a cab which is an integral part of the source under test; this is the case for many

industrial trucks and earth-moving machines;

c) work station within a partial or total enclosure (or behind a screen) supplied by the manufacturer as an

integral part of the source under test;

d) work station partially or totally enclosed by the source under test — this situation may be encountered

with some large industrial machines;

e) bystander positions occupied by individuals not responsible for the operation of the source under test, but

who may be in its immediate vicinity, either occasionally or continuously;

f) other specified positions, not necessarily work stations or bystander positions.

The work station may also lie on a specified path along which an operator moves (see 9.4).

2 Normative references

The following referenced documents are indispensable for the application 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.

ISO 3744, Acoustics — Determination of sound power levels of noise sources using sound pressure —

Engineering method in an essentially free field over a reflecting plane

ISO 3746, Acoustics — Determination of sound power levels of noise sources using sound pressure —

Survey method using an enveloping measurement surface over a reflecting plane

ISO 5725 (all parts), Accuracy (trueness and precision) of measurement methods and results

ISO 12001, Acoustics — Noise emitted by machinery and equipment — Rules for the drafting and

presentation of a noise test code
IEC 60942:2003, Electroacoustics — Sound calibrators

IEC 61260:1995, Electroacoustics — Octave-band and fractional-octave-band filters (amended by

IEC 61260/Amd.1:2001)
IEC 61672-1:2002, Electroacoustics — Sound level meters — Part 1: Specifications

ISO/IEC Guide 98-3:2008, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in

measurement (GUM:1995)
2 © ISO 2010 – All rights reserved
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SIST EN ISO 11204:2010
ISO 11204:2010(E)
3 Terms and definitions

For the purposes of this document, the following terms and definitions apply. More detailed definitions can be

found in noise test codes for specific types of machines.
3.1
emission

〈acoustics〉 airborne sound radiated by a well-defined noise source (e.g. the machine under test)

NOTE Noise emission descriptors can be incorporated into a product label and/or product specification. The basic

noise emission descriptors are the sound power level of the source itself and the emission sound pressure levels at a work

station and/or at other specified positions (if any) in the vicinity of the source.

3.2
emission sound pressure

sound pressure, at a work station or another specified position near a noise source, when the source is in

operation under specified operating and mounting conditions on a reflecting plane surface, excluding the

effects of background noise as well as the effects of reflections other than those from the plane or planes

permitted for the purpose of the test
NOTE Emission sound pressure is expressed in pascals.
3.3
emission sound pressure level

ten times the logarithm to the base 10 of the ratio of the square of the emission sound pressure, p, to the

square of a reference value, p , expressed in decibels
L = 10lg dB (1)
where the reference value, p , is 20 µPa

NOTE The emission sound pressure level is determined at a work station or another specified position in accordance

with either a noise test code for a specific family of machines or, if no noise test code exists, one of the standards of the

[15] [19]
series ISO 11200 to ISO 11205 .
3.4
time-averaged emission sound pressure level
p,T

ten times the logarithm to the base 10 of the ratio of the time average of the square of the emission sound

pressure, p, during a stated time interval of duration, T (starting at t and ending at t ), to the square of a

1 2
reference value, p , expressed in decibels
⎡⎤2
pt()dt
⎢⎥T
⎢⎥1
L = 10lg dB (2)
pT,
where the reference value, p , is 20 µPa

NOTE 1 For simplicity of notation, the subscript T is omitted throughout the following text.

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ISO 11204:2010(E)

NOTE 2 If specific frequency and time weightings as specified in IEC 61672-1 and/or specific frequency bands are

applied, this is indicated by appropriate subscripts; e.g. L denotes the A-weighted emission sound pressure level.

NOTE 3 Equation (2) is equivalent to that for the environmental noise descriptor “equivalent continuous sound pressure

[1]

level” (ISO 1996-1 ). However, the emission quantity defined above is used to characterize the noise emitted by a source

under test and assumes that standardized measurement and operating conditions as well as a controlled acoustical

environment are used for the measurements.
3.5
peak emission sound pressure
peak
greatest absolute emission sound pressure during a stated time interval
NOTE 1 Peak sound pressure is expressed in pascals.

NOTE 2 A peak sound pressure may arise from a positive or negative sound pressure.

3.6
peak emission sound pressure level
p,peak

ten times the logarithm to the base 10 of the ratio of the square of the peak emission sound pressure, p , to

peak
the square of a reference value, p , expressed in decibels
peak
L = 10lg dB (3)
p,peak
where the reference value, p , is 20 µPa

NOTE The peak emission sound pressure level is usually C-weighted and denoted by L .

pC,peak
3.7
single event emission sound pressure level

ten times the logarithm to the base 10 of the ratio of the integral of the square of the emission sound pressure,

p, of an isolated single sound event (burst of sound or transient sound) of specified duration T (or specified

measurement time interval T = t − t covering the single event) to the square of a reference value, p ,

2 1 0
normalized to reference time interval T = 1 s, expressed in decibels
1(pt)
Lt= 10lg d dB
⎢⎥ (4)
⎣⎦1
=+L 10lg dB
p,T

NOTE Equation (4) is equivalent to that for the environmental noise descriptor “sound exposure level”

[21]

(ISO/TR 25417:2007 , 2.7). However, the emission quantity defined above is used to characterize the noise emitted by a

source under test and assumes that standardized measurement, mounting, and operating conditions as well as a

controlled acoustical environment are used for the measurements.
3.8
acoustic free field over a reflecting plane

sound field in a homogeneous, isotropic medium in the half space above an infinite reflecting plane, in the

absence of any other obstacles
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ISO 11204:2010(E)
3.9
frequency range of interest

for general purposes, the frequency range of octave bands with nominal mid-band frequencies from 125 Hz to

8 000 Hz or the one-third octave bands with nominal mid-band frequencies from 100 Hz to 10 000 Hz

[10]
NOTE 1 Adapted from ISO 6926:1999 , 3.10.

NOTE 2 For special purposes, the frequency range may be extended or reduced, provided that the test environment

and instrument specifications are satisfactory for use over the modified frequency range. Changes to the frequency range

of interest should be made clear in the test report. For sources which emit sound at predominantly high or low frequencies,

the frequency range of interest should be extended to include these frequencies.
3.10
work station
operator's position

position in the vicinity of the machine under test which is intended for the operator

3.11
operator

individual whose work station is in the vicinity of a machine and who is performing a work task associated with

that machine
3.12
specified position

position defined in relation to a machine, including, but not limited to, an operator's position

NOTE 1 The position can be a single, fixed point, or a combination of points along a path or on a surface located at a

specified distance from the machine, as described in the relevant noise test code, if one exists.

NOTE 2 Positions located in the vicinity of a work station, or in the vicinity of an unattended machine, may be identified

as “bystander positions”.

NOTE 3 Throughout the text of this International Standard, the word “work station” applies to possible specified

positions listed in 1.4.
3.13
operational period
interval of time during wh
...

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