SIST EN ISO 11205:2009

SLOVENSKI STANDARD
SIST EN ISO 11205:2009
01-november-2009
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SIST EN ISO 11205:2004
SIST EN ISO 11205:2004/AC:2006
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Acoustics - Noise emitted by machinery and equipment - Engineering method for the
determination of emission sound pressure levels in situ at the work station and at other
specified positions using sound intensity (ISO 11205:2003)
Akustik - Geräuschabstrahlung von Maschinen und Geräten - Verfahren der
Genauigkeitsklasse 2 zur Bestimmung von Emissions-Schalldruckpegeln am Arbeitsplatz
und an anderen festgelegten Orten unter Einsatzbedingungen aus
Schallintensitätsmessungen (ISO 11205:2003)
Acoustique - Bruits émis par les machines et les équipements - Méthode d'expertise
pour la détermination par intensimétrie des niveaux de pression acoustique d'émission in
situ au poste de travail et en d'autres positions spécifiées (ISO 11205:2003)
Ta slovenski standard je istoveten z: EN ISO 11205:2009
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
SIST EN ISO 11205:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11205:2009

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SIST EN ISO 11205:2009
EUROPEAN STANDARD
EN ISO 11205
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2009
ICS 17.140.01 Supersedes EN ISO 11205:2003
English Version
Acoustics - Noise emitted by machinery and equipment -
Engineering method for the determination of emission sound
pressure levels in situ at the work station and at other specified
positions using sound intensity (ISO 11205:2003)
Acoustique - Bruits émis par les machines et les Akustik - Geräuschabstrahlung von Maschinen und
équipements - Méthode d'expertise pour la détermination Geräten - Verfahren der Genauigkeitsklasse 2 zur
par intensimétrie des niveaux de pression acoustique Bestimmung von Emissions-Schalldruckpegeln am
d'émission in situ au poste de travail et en d'autres Arbeitsplatz und an anderen festgelegten Orten unter
positions spécifiées (ISO 11205:2003) Einsatzbedingungen aus Schallintensitätsmessungen (ISO
11205:2003)
This European Standard was approved by CEN on 27 July 2009.
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, 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
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11205:2009: E
worldwide for CEN national Members.

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SIST EN ISO 11205:2009
EN ISO 11205:2009 (E)
Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC .4
Annex ZB (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC .5

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SIST EN ISO 11205:2009
EN ISO 11205:2009 (E)
Foreword
The text of ISO 11205:2003 has been prepared by Technical Committee ISO/TC 43 “Acoustics” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 11205:2009 by
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 February 2010, and conflicting national standards shall be withdrawn
at the latest by February 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 11205:2003.
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 Directives.
For relationship with EU Directives, see informative Annexes ZA and ZB, which are integral parts 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, 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 11205:2003 has been approved by CEN as a EN ISO 11205:2009 without any modification.
3

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SIST EN ISO 11205:2009
EN ISO 11205:2009 (E)

Annex ZA
(informative)

Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/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 98/37/EC, amended by 98/79/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
relevant 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.
4

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SIST EN ISO 11205:2009
EN ISO 11205:2009 (E)
Annex ZB
(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
relevant 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.




5

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SIST EN ISO 11205:2009

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SIST EN ISO 11205:2009


INTERNATIONAL ISO
STANDARD 11205
First edition
2003-11-15


Acoustics — Noise emitted by machinery
and equipment — Engineering method
for the determination of emission sound
pressure levels in situ at the work station
and at other specified positions using
sound intensity
Acoustique — Bruits émis par les machines et les équipements —
Méthode d'expertise pour la détermination par intensimétrie des
niveaux de pression acoustique d'émission in situ au poste de travail et
en d'autres positions spécifiées




Reference number
ISO 11205:2003(E)
©
ISO 2003

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SIST EN ISO 11205:2009
ISO 11205:2003(E)
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ii © ISO 2003 — All rights reserved

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SIST EN ISO 11205:2009
ISO 11205:2003(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 1
4 Measurement uncertainty. 3
5 Principle . 4
6 Instrumentation . 4
6.1 General. 4
6.2 Calibration. 4
7 Installation and operation of the source. 5
7.1 General. 5
7.2 Location of the machine. 5
7.3 Mounting of the machine. 5
7.4 Auxiliary equipment. 6
7.5 Operation of the machine under test . 6
8 Test procedure . 7
8.1 Applicability. 7
8.2 Measurement time interval. 7
8.3 Measurements . 8
8.4 Wind and gas flows. 9
8.5 Criteria for qualification of the measurement . 9
8.6 Criterion for background noise . 9
8.7 Frequency range of measurements . 9
8.8 Evaluation of the measurement result. 9
9 Information to be recorded . 10
9.1 General. 10
9.2 Machine under test . 10
9.3 Test conditions. 10
9.4 Acoustic environment . 10
9.5 Instrumentation . 10
9.6 Location of specified positions . 11
9.7 Noise data . 11
10 Information to be reported . 11
Annex A (normative) Criterion for the adequacy of the direction of the sound intensity vector. 12
Annex B (normative) Procedure for frequencies higher than 5 000 Hz . 14
Annex C (normative) Procedure in case the measurement fails to qualify. 15
Annex D (informative) Example of a test table . 16
Bibliography . 17

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SIST EN ISO 11205:2009
ISO 11205:2003(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 11205 was prepared by Technical Committee ISO/TC 43, Accoustics, Subcommittee SC 1, Noise.

iv © ISO 2003 — All rights reserved

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SIST EN ISO 11205:2009
INTERNATIONAL STANDARD ISO 11205:2003(E)

Acoustics — Noise emitted by machinery and equipment —
Engineering method for the determination of emission sound
pressure levels in situ at the work station and at other specified
positions using sound intensity
1 Scope
This International Standard specifies an engineering method (grade 2 accuracy) to determine the emission
sound pressure level of machines in situ, at the work station or at other specified positions, using sound
intensity. It is an alternative to ISO 11201, ISO 11202 and ISO 11204 for in situ measurements. It is applicable
to all kinds of test environments provided that the requirements on background noise and field indicators are
fulfilled.
This International Standard is applicable to equipment emitting stationary broadband noise. The noise can
differ between operational cycles and can be with or without discrete frequency or narrow band components.
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 7574-1, Acoustics — Statistical methods for determining and verifying stated noise emission values of
machinery and equipment — Part 1: General considerations and definitions
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 61043:2003, Electroacoustics — Instruments for the measurement of sound intensity — Measurements
with pairs of pressure sensing microphones
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
sound intensity
G
I
time-averaged instantaneous flow of sound energy per unit of area and per unit time in the direction of the
local instantaneous acoustic particle velocity in a temporally stationary sound field
T
G
1 G
I = lim pt( )u(t) dt
∫
T →∞ T
0
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SIST EN ISO 11205:2009
ISO 11205:2003(E)
where
p(t) is the instantaneous sound pressure at a point, in pascals;
G
ut() is the associated instantaneous particle velocity at the same point, in metres per second;
T is the integration period, in seconds;
NOTE The sound intensity is a vectorial quantity. It is expressed in watts per square metre.
3.2
sound intensity vector
G
I
xyz
vector sum of three measured orthogonal intensity components
NOTE It is expressed in watts per square metre.
3.3
level of the sound intensity vector
L
Ixyz
ten times the logarithm to the base 10 of the ratio of the modulus of the sound intensity vector to the reference
intensity I , in decibels, as given by
0
G

I
xyz

L = 10 lg dB
Ixyz

I
0
−12 2
NOTE The reference sound intensity is I = 10 W/m .
0
3.4
sound field pressure-intensity indicator or field indicator
F
pIxyz
difference, in decibels, between the time-averaged measured sound pressure level, L' , and the level of the
p
sound intensity vector, L , given by
Ixyz
F = L' – L
pIxyz p Ixyz
NOTE 1 When the indicator is determined for each of the Cartesian coordinates x, y and z, it is denoted F , F and
pIx pIy
F respectively.
pIz
NOTE 2 In ISO 9614-1 the notation F is used.
2
3.5
pressure-residual intensity index
δ
pI0
difference, in decibels, between the indicated sound pressure level and the sound intensity level when the
intensity probe is placed and oriented in a sound field such that the sound intensity is zero
EXAMPLE This can be achieved in an acoustic coupler, or other suitable unit that has been designed for the probe
so that the microphones are transverse to the direction of propagation of plane sound waves.
3.6
emission sound pressure level
L
p
sound pressure level at a specified position near a machine, when the machine is in operation under specified
operating and mounting conditions on a reflecting plane surface, excluding the effects of background noise as
well as the effect of reflections other than those from the plane or planes permitted for the purpose of the test
NOTE It is expressed in decibels.
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SIST EN ISO 11205:2009
ISO 11205:2003(E)
3.7
specified position
position defined in relation to a machine, including, but not limited to, an operator’s position
NOTE 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 test code, if any. Positions located in the vicinity of a
work station, or in the vicinity of an unattended machine, may be identified as “bystander positions”.
3.8
dynamic capability index
L
d
difference, in decibels, between the pressure-residual intensity index and the bias error factor, K
L=−δ K
d0pI
NOTE The value of K is 10 dB in this International Standard.
3.9
hemi-free field intensity correction
K
5
correction to account for the fact that the sound intensity level is slightly smaller than the sound pressure level
in a hemi-free field
NOTE 1 In this International Standard, K = 1 dB.
5
NOTE 2 By introducing this correction, the risk of a small systematic underestimate of the emission sound pressure
level is minimized, see references [9] to [16] in the Bibliography. K is frequency independent and thus also valid for
5
A-weighted sound pressure levels with the notation K .
5A
4 Measurement uncertainty
A single value of an emission sound pressure level of a noise source determined according to the procedures
of this International Standard is likely to differ from the true value at a fixed position by an amount within the
range of the measurement uncertainty. The uncertainty in measurements of emission sound pressure levels
arises from several factors which affect the results, some associated with environmental conditions in the
measurement room and others with experimental techniques. A method for the determination of the
measurement uncertainty from information on the various influence parameters is specified in the GUM.
Until more specific knowledge is available, the estimation of the measurement uncertainty might be based on
existing information on the standard deviations of reproducibility and repeatibility according to ISO 7574-1.
Extensive measurement data are necessary in order to establish standard deviations of reproducibility and
repeatability of emission sound pressure levels at individual positions; in any case, these standard deviations
are likely to vary considerably between the many types of different machinery and equipment to which this
International Standard is applied. It is therefore not possible to provide information that is universally
applicable, and reference can only be made to noise test codes for relevant data on individual types of
machines.
A typical value for the standard deviation of reproducibility is given in Table 1. From this, and with additional
information on the standard deviation of repeatibility, the total standard deviation and an estimate of the
expanded measurement uncertainty for a coverage probability of approximately 95 % corresponding to a
coverage factor of two, may be derived, as indicated.
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SIST EN ISO 11205:2009
ISO 11205:2003(E)
Table 1 — Measurement uncertainty of the A-weighted emission sound pressure level
a b
Total standard deviation Expanded
Reproducibility Repeatability standard
d
standard deviation, σ , deviation, σ , for an uncertainty
RA rA
for a stable source unstable source
dB dB dB dB
22 22
c
σ
1,5 σσ+ 2σσ+
rA
RrAA RrAA
a
Found by different operators using different equipment measuring the same machine in different environments. This value includes
a small repeatability standard deviation (σ ≈ 0,5 dB).
r
b
Found by the same operator measuring the same machine in the same environment using the same equipment (only to be used
if σ > 0,5 dB).
r
c
If frequencies above 5 000 Hz dominate the A-weighted level, σ may be greater, see Annex B.
RA
d
95 % confidence under the assumption of a Gaussian distribution.

NOTE The value of the measurement uncertainty has been taken from References [11], [12], [15], [16] and [17] in the
Bibliography.
5 Principle
The basic principle of the test method is that the sound intensity in a diffuse sound field is small (theoretically it
should be zero) and that the sound pressure level equals the sound intensity level in a free progressive wave.
The test method assumes that sound which has been reflected will add up to a diffuse sound field. The direct
sound from the machine under test will not be part of the diffuse sound field but constitute the free progressive
wave.
These assumptions will not be fulfilled if sound intensities from different parts of the machine with similar
magnitude will meet at the probe and, to some extent, cancel each other. In such cases, the sound intensity
will become smaller and, assuming uncorrelated summation, the sound pressure will become greater. In such
cases, the level of the sound intensity vector will underestimate the emission sound pressure level. By adding
K to deal with the underestimate of the floor reflection and, for large machines, by requiring that the sound
5
field pressure-intensity indicator meets the criterion specified in 8.5 the underestimate will be negligible.
6 Instrumentation
6.1 General
−12 2
The intensity-measuring instrumentation shall be able to measure intensity levels re 10 W/m in decibels in
octave or one-third-octave bands. The instrument, including the probe, shall comply with a Class 1 instrument
in accordance with IEC 61043:2003. If the probe does not have a flat frequency response above 5 000 Hz,
see Annex B.
The residual pressure-intensity index δ of the microphone probe and analyser shall be higher than
pI0
F + 10 dB in each octave or one-third-octave band.
pI
6.2 Calibration
The compliance of the instrumentation system with the requirements of IEC 61043 shall be verified
periodically in a manner that is traceable to appropriate standards.
During each series of measurements, the instrument and the probe shall be calibrated at least at one
frequency in the range from 200 Hz to 1 000 Hz in accordance with the calibration procedure.
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SIST EN ISO 11205:2009
ISO 11205:2003(E)
The following field checks to test the instrument shall be made before each series of measurements.
a) Carry out a field check according to the instrument manufacturer's specifications.
If no field check is specified by the instrument manufacturer, check the instrumentation according to b)
and c):
b) Sound pressure level: Check each pressure microphone of the intensity probe for sound pressure level
using a Class 1 calibrator in accordance with IEC 60942:2003.
c) Intensity: Calibrate using an intensity calibrator. If such a calibrator is not available or if the probe
construction does not allow it, make a check as follows. Place the intensity probe, oriented towards the
most important source of sound emission, at a position where the noise from the machine is characteristic
for that machine. The intensity probe should be mounted on a stand to retain the same position while
carrying out the measurement check. Measure the intensity. Reverse the direction of the intensity probe
180° in the same position as the first measurement and measure the intensity
...