SIST EN ISO 11201:2009
(Main)Acoustics - Noise emitted by machinery and equipment - Measurement of emission sound pressure levels at a work station and at other specified positions - Engineering method in an essentially free field over a reflecting plane (ISO 11201:1995, including Cor 1:1997)
Acoustics - Noise emitted by machinery and equipment - Measurement of emission sound pressure levels at a work station and at other specified positions - Engineering method in an essentially free field over a reflecting plane (ISO 11201:1995, including Cor 1:1997)
This International Standard specifies a method for measuring the emission sound pressure levels of machinery and equipment, at a work station and at other specified positions nearby, in an essentially free field over a reflecting plane. A work station is occupied by an operator. It may be located in open space in the room where the source operates, or in a cab fixed to the source, or in an enclosure remote from the source. One or more specified positions may be located in the vicinity of a work station, or in the vicinity of an unattended machine. As some of these positions may be occupied occasionally or regularly, they are sometimes referred to as bystander positions. Emission sound pressure levels are measured as Aweighted and, if required, C-weighted peak, and in frequency bands. NOTE 1 The contents of this and related International Standards are summarized in table 1 of IS0 11200:1995. This International Standard specifies requirements for the engineering grade of accuracy on the test environment and instrumentation. Corrections are applied for background noise, but not for the acoustic environment. Instructions are given for the installation and operation of the machine under test and for the choice of microphone positions for the work station and for other specified positions. The purpose of the measurements is to permit comparison of the performance of different units of a given family of machinery or equipment, under defined environmental conditions and standardized mounting and operatingconditions. The data obtained may also be used for the declaration and verification of emission sound pressure levels as specified in IS0 4871. NOTE 2 At any given position in relation to a particular machine, and for given mounting and operating conditions, the emission sound pressure levels determined by the method of this International Standard will in general be lower than the directly measured sound pressure levels for the same machine in the typical workroom where it is used. This is due to reverberation and the contributions of other machines. A method of calculating the sound pressure levels in the vicinity of a machine operating alone in a workroom is given in IS0 11690-3. Commonly observed differences are 1 dB to 5 dB, but in extreme cases the difference may be even greater.
Akustik - Geräuschabstrahlung von Maschinen und Geräten - Messung von Emissions-Schalldruckpegeln am Arbeitsplatz und an anderen festgelegten Orten - Verfahren der Genauigkeitsklasse 2 für ein im wesentlichen freies Schallfeld über einer reflektierenden Ebene (ISO 11201:1995, einschließlich Cor 1:1997)
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 - Méthode d'expertise dans des conditions approchant celles du champ libre sur plan réfléchissant (ISO 11201:1995, Cor 1:1997 inclus)
Akustika - Emisija hrupa naprav in opreme - Merjenje ravni zvočnega tlaka na mestu delovanja in na drugih opredeljenih mestih - Inženirska metoda v pretežno prostem zvočnem polju nad odbojno ravnino (ISO 11201:1995, vključno s popravkom Cor 1:1997)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 11201:2009
01-november-2009
1DGRPHãþD
SIST EN ISO 11201:1997
SIST EN ISO 11201:1997/AC:1999
$NXVWLND(PLVLMDKUXSDQDSUDYLQRSUHPH0HUMHQMHUDYQL]YRþQHJDWODNDQD
PHVWXGHORYDQMDLQQDGUXJLKRSUHGHOMHQLKPHVWLK,QåHQLUVNDPHWRGDYSUHWHåQR
SURVWHP]YRþQHPSROMXQDGRGERMQRUDYQLQR ,62 YNOMXþQRV
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Acoustics - Noise emitted by machinery and equipment - Measurement of emission
sound pressure levels at a work station and at other specified positions - Engineering
method in an essentially free field over a reflecting plane (ISO 11201:1995, including Cor
1:1997)
Akustik - Geräuschabstrahlung von Maschinen und Geräten - Messung von Emissions-
Schalldruckpegeln am Arbeitsplatz und an anderen festgelegten Orten - Verfahren der
Genauigkeitsklasse 2 für ein im wesentlichen freies Schallfeld über einer reflektierenden
Ebene (ISO 11201:1995, einschließlich Cor 1:1997)
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 -
Méthode d'expertise dans des conditions approchant celles du champ libre sur plan
réfléchissant (ISO 11201:1995, Cor 1:1997 inclus)
Ta slovenski standard je istoveten z: EN ISO 11201:2009
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
SIST EN ISO 11201:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 11201:2009
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SIST EN ISO 11201:2009
EUROPEAN STANDARD
EN ISO 11201
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2009
ICS 17.140.20 Supersedes EN ISO 11201:1995
English Version
Acoustics - Noise emitted by machinery and equipment -
Measurement of emission sound pressure levels at a work
station and at other specified positions - Engineering method in
an essentially free field over a reflecting plane (ISO 11201:1995,
including Cor 1:1997)
Acoustique - Bruit émis par les machines et équipements - Akustik - Geräuschabstrahlung von Maschinen und
Mesurage des niveaux de pression acoustique d'émission Geräten - Messung von Emissions-Schalldruckpegeln am
au poste de travail et en d'autres positions spécifiées - Arbeitsplatz und an anderen festgelegten Orten - Verfahren
Méthode d'expertise dans des conditions approchant celles der Genauigkeitsklasse 2 für ein im wesentlichen freies
du champ libre sur plan réfléchissant (ISO 11201:1995, Cor Schallfeld über einer reflektierenden Ebene (ISO
1:1997 inclus) 11201:1995, einschließlich Cor 1:1997)
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 11201:2009: E
worldwide for CEN national Members.
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SIST EN ISO 11201:2009
EN ISO 11201:2009 (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
2
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SIST EN ISO 11201:2009
EN ISO 11201:2009 (E)
Foreword
The text of ISO 11201:1995, including Cor 1:1997 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
11201:2009 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 11201:1995.
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 EC Directives.
For relationship with EC 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 11201:1995, including Cor 1:1997 has been approved by CEN as a EN ISO 11201:2009
without any modification.
3
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SIST EN ISO 11201:2009
EN ISO 11201:2009 (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 11201:2009
EN ISO 11201:2009 (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 11201:2009
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SIST EN ISO 11201:2009
INTERNATIONAL
IS0
STANDARD
11201
First edition
1995-l 2-l 5
Acoustics - Noise emitted by machinery
and equipment - Measurement of
emission sound pressure levels at a work
station and at other specified positions -
Engineering method in an essentially free
field over a reflecting plane
Acoustique - Bruit 6mis par /es machines et 6quipements - Mew-age
des niveaux de pression acoustique d ’kmission au poste de travail et en
d ‘autres positions spkifikes - M&hode d/expertise dans des conditions
approchan t celles du champ libre sur plan rkflkchissant
Reference number
IS0 11201 :I 995(E)
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SIST EN ISO 11201:2009
IS0 11201:1995(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 11201 was prepared by Technical Committee
ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
Annexes A, B and C of this International Standard are for information only.
0 IS0 1995
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
Intern ational Organization for Standardization
Case Postale 56 l CH-121 1 Geneve 20 l Switz erland
Printed in Switzerland
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SIST EN ISO 11201:2009
0 IS0
IS0 11201:1995(E)
Introduction
0.1 This International Standard specifies a method for measuring the
emission sound pressure levels at a work station and at other specified
positions, in the vicinity of a machine or piece of equipment, in an essen-
tially free field over a reflecting plane. In general, these sound pressure
levels will be equal to or lower than those that would occur when the
machinery or equipment is operating in its normal surroundings. This is
because the sound pressure levels are determined by excluding the ef-
fects 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.
0.2 This International Standard is one of a series (IS0 11200 to
IS0 11204) which specifies various methods for determining the noise
emissions of a piece of machinery or equipment, or a sub-assembly of
such equipment (machine under test). IS0 11200 gives guidance on the
choice of the method to be used to determine the emission sound
pressure levels of machinery and equipment. It also gives details of lnter-
national Standards giving methods for the determination of sound power
levels.
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SIST EN ISO 11201:2009
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SIST EN ISO 11201:2009
IS0 11201:1995(E)
INTERNATIONAL STANDARD 0 IS0
- Noise emitted by machinery and
Acoustics
equipment - Measurement of emission sound
pressure levels at a work station and at other specified
positions - Engineering method in an essentially free
field over a reflecting plane
formance of different units of a given family of ma-
1 Scope
chinery or equipment, under defined environmental
conditions and standardized mounting and operating
conditions. The data obtained may also be used for
1 .l General
the declaration and verification of emission sound
pressure levels as specified in IS0 4871.
This International Standard specifies a method for
measuring the emission sound pressure levels of
NOTE 2 At any given position in relation to a particular
machinery and equipment, at a work station and at
machine, and for given mounting and operating conditions,
other specified positions nearby, in an essentially free
the emission sound pressure levels determined by the
field over a reflecting plane. A work station is occu-
method of this International Standard will in general be
pied by an operator. It may be located in open space
lower than the directly measured sound pressure levels for
in the room where the source operates, or in a cab
the same machine in the typical workroom where it is used.
fixed to the source, or in an enclosure remote from This is due to reverberation and the contributions of other
machines. A method of calculating the sound pressure lev-
the source. One or more specified positions may be
els in the vicinity of a machine operating alone in a
located in the vicinity of a work station, or in the vi-
workroom is given in IS0 11690-3. Commonly observed
cinity of an unattended machine. As some of these
differences are 1 dB to 5 dB, but in extreme cases the dif-
positions may be occupied occasionally or regularly,
ference may be even greater.
they are sometimes referred to as bystander pos-
itions.
1.2 Types of noise and noise sources
Emission sound pressure levels are measured as A-
weighted and, if required, C-weighted peak, and in
The method specified in this lnternationa
Standard is
frequency bands.
applicable to all types of machinery, both
moving and
stationary, for indoor or outdoor use.
NOTE 1 The contents of this and related International
Standards are summarized in table 1 of IS0 11200:1995.
The method is applicable to machines of l
II sizes, and
to all types of noise as defined in IS0 2204 and
This International Standard specifies requirements for
IS0 12001.
the engineering grade of accuracy on the test en-
vironment and instrumentation. Corrections are ap-
plied for background noise, but not for the acoustic I .3 Test environment
environment. Instructions are given for the installation
and operation of the machine under test and for the The type of test environment influences the accuracy
choice of microphone positions for the work station of the determination of emission sound pressure lev-
and for other specified positions. The purpose of the els. An essentially free field over a reflecting plane
measurements is to permit comparison of the per- (indoors or outdoors) is required.
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SIST EN ISO 11201:2009
0 IS0
IS0 11201:1995(E)
Members of IEC and IS0 maintain registers of cur-
1.4 Specified positions
rently valid International Standards.
This International Standard is applicable to work
IS0 2204:1979, Acoustics - Guide to International
stations and other specified positions where emission
Standards on the measurement of airborne acoustical
sound pressure levels are to be measured.
noise and evaluation of its effects on human beings.
Examples of appropriate positions where measure-
ments may be made include the following: IS0 3744: 1994, Acoustics - Determination of sound
power levels of noise sources using sound pressure
work station located in the vicinity of the machine
a) - Engineering method in an essentially free field over
under test; this is the case for many industrial a reflecting plane.
machines and domestic appliances;
IS0 3745:1977, Acoustics - Determination of sound
b) work station within a cab which is an integral part power levels of noise sources - Precision methods
of the machine under test; this is the case for
for anechoic and semi-anechoic rooms.
many industrial trucks and earth-moving ma-
chines; IS0 3746: 1995, Acoustics - Determination of sound
power levels of noise sources using sound pressure
c) work station within a partial or total enclosure (or - Survey method using an enveloping measurement
behind a screen) supplied by the manufacturer as surface over a reflecting plane.
an integral part of the machinery or equipment;
IS0 11200:1995, Acoustics - Noise emitted by ma-
d) work station partially or totally enclosed by the
chinery and equipment - Guidelines for the use of
machine under test; this situation may be en-
basic standards for the determination of emission
countered with some large industrial machines; sound pressure levels at a work station and at other
specified positions.
bystander positions occupied by individuals not
responsible for the operation of the machine
IS0 12001: -‘1, Acoustics - Noise emitted by ma-
under test, but who may be in its immediate vi-
chinery and equipment - Rules for the drafting and
cinity, either occasionally or continuously;
presentation of a noise test code.
other specified positions, not necessarily work IEC 651: 1979, Sound level meters,
stations or bystander positions.
I EC 804: 1985, Integrating-averaging sound level me-
The work station may also lie on a specified path
ters.
along which an operator moves (see 11.4).
I EC 942: 1988, Sound calibrators.
1.5 Measurement uncertainty
IEC 1260: -*I, Electroacoustics - Octave-band and
fractional-octave-band filters.
While it is not possible to give universal values for the
standard deviation of reproducibility of emission
sound pressure levels at work stations, guidance is
3 Definitions
given in clause 4.
For the purposes of this International Standard, the
following definitions apply. More detailed definitions
2 Normative references
may be found in noise test codes for specific types
of machinery and equipment.
The following standards contain provisions which,
through reference in this text, constitute provisions
3.1 emission: Airborne sound radiated by a well-
of this International Standard. At the time of publi-
defined noise source (e.g. the machine under test).
cation, the editions indicated were valid. All standards
are subject to revision, and parties to agreements
NOTE 3 Noise emission descriptors may be incorporated
based on this International Standard are encouraged
in a product label and/or product specification. The basic
to investigate the possibility of applying the most re-
noise emission descriptors are the sound power level of the
source itself and the emission sound pressure levels at a
cent editions of the standards indicated below.
1) To be published.
2) To be published. (Revision of IEC 225:1966)
2
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SIST EN ISO 11201:2009
0 IS0
IS0 11201:1995(E)
specified positions (if any) in the 6 Equation (I) is identical to that for the familiar IS0 en-
work statio na nd/or at
vicinity of t he source. vironmental noise descriptor “equivalent continuous sound
pressure level” defined in IS0 1996-I. However, the emis-
sion quantity defined above is used to characterize the noise
3.2 emission sound pressure, p: The sound press-
emitted by a machine under test and assumes that stan-
ure, at a specified position near a noise source, when
dardized measurement and operating conditions as well as
the source is in operation under specified operating
a controlled acoustical environment are used for the
and mounting conditions on a reflecting plane surface,
measurements.
excluding the effects of background noise as well as
the effects of reflections other than those from the
3.3.2 peak emission sound pressure level, L], peak:
I
plane or planes permitted for the purpose of the test.
Highest instantaneous value of the emission sound
It is expressed in pascals.
pressure level determined over an operational cycle.
It is expressed in decibels.
3.3 emission sound pressure level, Lp: Ten times
the logarithm to the base 10 of the ratio of the square
3.3.3 single-event emission sound pressure level,
of the emission sound pressure, p2 t), to the square
1
L p ,s: Time-integrated emission sound pressure level
of the reference sound pressure, po, measured with
of ’an isolated single sound event of specified duration
a particular time weighting and a particular frequency
T (or specified measurement time T) normalized to
weighting, selected from those defined in IEC 651. It
To=1 s.
is expressed in decibels. The reference sound press-
ure is 20 PPa.
It is expressed in decibels and is given by the follow-
ing equation:
NOTE 4 Examples include:
2
1 T P (0
- maximum A-weighted emission sound pressure level
L
10 Ig dt dB . . .
(2)
p,ls =
2
I
with time-weighting F: LpAFmax;
To 0
PO
- C-weighted peak emission sound pressure level:
L
= peqT+ 10 Ig T dB
L
/K,peak-
TO
The emission sound pressure level shall be deter-
NOTE 7 The above equation is identical to that for the
mined at a specified position in accordance with either
familiar IS0 environmental noise descriptor “sound expo-
sure level ”. However, the emission quantity defined above
a test code for a specific family of machines or, if no
is used to characterize a noise source and assumes that a
test code exists, a method that complies with the
controlled environment is used for the measurements.
IS0 11200 series.
3.4 impulsive noise index (impulsiveness): Quan-
3.3.1 time-averaged emission sound pressure
tity by means of which the noise emitted by a source
level, LpeqT: Emission sound pressure level of a con-
can be characterized as “impulsive ”. (See annex A.)
tinuous steady sound that, within a measurement
It is expressed in decibels.
time interval, T, has the same mean square sound
pressure as a sound under consideration which varies
3.5 free field over a reflecting plane: Sound field
with time.
in a homogeneous, isotropic medium in the half space
It is expressed in decibels and is given by the follow-
above an infinite, rigid plane surface on which the
ing equation:
machine under test is located.
2
P (4
3.6 work station; operator ’s position: Position in
L 7dt dB . . .
(1)
peqr= lo lg+/*
the vicinity of the machine under test which is in-
O PO
tended for the operator.
A-weighted time-averaged emission sound pressure
levels are denoted by LpAeqT, which is usually abbrevi-
3.7
operator: Individual whose work station is in the
shall be measured with an instru-
ated to LpA- LpAeqT vicinity of a machine and who is performing a work
ment which complies with the requirements of
task associated with that machine.
IEC 804.
3.8 specified position: Position defined in relation
NOTES
to a machine, including, but not limited to, an oper-
ator ’s position. The position can be a single, fixed
5 In general, the subscripts eq and T are omitted since
point, or a combination of points along a path or on a
time-averaged emission sound pressure levels are necess-
surface located at a specified distance from the ma-
arily determined over a certain measurement time interval.
3
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SIST EN ISO 11201:2009
0 IS0
IS0 11201:1995(E)
chine, as described in the relevant noise test code, if
4 Measurement uncertainty
any exists.
A single value of an emission sound pressure level of
NOTE 8 Positions located in the vicinity of a work station,
a noise source determined in accordance with the
or in the vicinity of an unattended machine, may be ident-
method specified in this International Standard is likely
if ied as ” bystander positions “.
to differ from the true value at a fixed position by an
amount within the range of the measurement uncer-
3.9 operational period: Interval of time during
tainty. The uncertainty in measurements of emission
which a specified process is accomplished by the
sound pressure levels arises from several factors
machine under test (e.g. for a dishwasher when
which affect the results, some associated with en-
washing or rinsing or drying).
vironmental conditions in the measurement room and
others with experimental techniques.
3.10 operational cycle: Specific sequence of oper-
The measurement uncertainty depends on the stan-
ational periods occurring while the machine under test
dard deviation of reproducibility and on the degree of
performs a complete work cycle. Each operational
confidence that is desired. Extensive measurement
period is associated with a specific process that may
data are necessary in order to establish standard de-
occur only once, or may be repeated, during the op-
viations of reproducibility of emission sound pressure
erational cycle (e.g. for a dishwasher when washing
levels at individual positions and, in any case, these
and rinsing and drying).
standard deviations are likely to vary considerably be-
tween the many different types of machinery and
3.11 measurement time interval: Portion or a
equipment to which this International Standard is ap-
multiple of an operational period or operational cycle
plicable. It is therefore not possible to provide infor-
for which the emission sound pressure level is deter-
mation which is universally applicable, and reference
mined or over which the maximum emission sound
can only be made to noise test codes for relevant data
pressure level is searched for.
on individual types of noise source.
3.12 time history: Continuous recording of the
The engineering method described in this lnter-
emission sound pressure level, as a function of time, national Standard yields a higher degree of accuracy
which is obtained during one or more operational than the survey method described in IS0 11202 be-
periods of an operational cycle. cause the measurements are carried out under
controlled environmental conditions.
3.13 background noise: The noise from all sources
For this engineering method, a value of the standard
other than the machine under test.
deviation of reproducibility equal to or less than
2,5 dB (excluding variations in operating and mounting
NOTE 9 Background noise may include contributions
conditions) is expected for the A-weighted emission
from airborne sound, structure-borne vibration, and elec-
sound pressure level of a source which emits noise
trical noise in instrumentation.
with a relatively “flat” spectrum in the frequency
range 100 Hz to 10 000 Hz.
3.14 background noise level: The sound pressure
level measured when the machine under test is not
The given value for the standard deviation of
operating. It is expressed in decibels.
reproducibility is a maximum value but, for a well-
defined family of machines, it may be smaller. For
3.15 background noise correction, K,: A correction
example, for one family of woodworking machines, it
term to account for the influence of background noise
has been shown that the standard deviation of
on the emission sound pressure level at the specified
reproducibility is equal to I,0 dB.
positions of the machine under test. K, is frequency
dependent and is expressed in decibels. The cor- NOTE 10 If the machine under test is highly directional
or its spectrum has tonal components, the measurement
rection in the case of A-weighting, &, is to be de-
uncertainty may be larger. The risk of this being the case
termined from A-weighted measured values.
can be reduced by keeping the environmental indicator (see
6.2) less than 0,5 dB.
3.16 environmental indicator, K2: A term to ac-
count for the influence of reflected or absorbed sound
on the surface sound pressure level. K2 is frequency 5 Instrumentation
dependent and is expressed in decibels. In the case
The instrumentation system, including the micro-
of A-weighting, it is denoted &A (see the IS0 3740
phone and cable, shall meet the requirements for a
series).
4
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SIST EN ISO 11201:2009
IS0 11201:1995(E)
0 IS0
condition. For this International Standard, the en-
class 1 instrument specified in IEC 651 or, in the case
vironmental indicator, &A, for a measurement surface
of integrating-averaging sound level meters, in
enveloping the measurement positions, shall not ex-
IEC 804.
ceed 2 dB.
For measurements in octave or one-third-octave
bands, the filters shall meet the requirements of NOTE 11 If it is necessary to make measurements in
spaces in which K2* exceeds 2 dB, then IS0 11202 or
IEC 1260.
IS0 11204 may be applicable.
Before and after each series of measurements, a
sound calibrator with an accuracy of + 0,3 dB (class
6.3 Enclosed work station positions
1 as specified in IEC 942) shall be applied to the
microphone to verify the calibration of the entire
When the operator is located in an enclosed cab or in
measuring system at one or more frequencies over
an enclosure remote from the machine under tes
...
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Akustik - Geräuschabstrahlung von Maschinen und Geräten - Messung von Emissions-Schalldruckpegeln am Arbeitsplatz und an anderen festgelegten Orten - Verfahren der Genauigkeitsklasse 2 für ein im wesentlichen freies Schallfeld über einer reflektierenden Ebene (ISO 11201:1995, einschließlich Cor 1:1997)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 - Méthode d'expertise dans des conditions approchant celles du champ libre sur plan réfléchissant (ISO 11201:1995, Cor 1:1997 inclus)Acoustics - Noise emitted by machinery and equipment - Measurement of emission sound pressure levels at a work station and at other specified positions - Engineering method in an essentially free field over a reflecting plane (ISO 11201:1995, including Cor 1:1997)17.140.20Emisija hrupa naprav in opremeNoise emitted by machines and equipmentICS:Ta slovenski standard je istoveten z:FprEN ISO 11201kSIST FprEN ISO 11201:2009en01-junij-2009kSIST FprEN ISO 11201:2009SLOVENSKI
STANDARD
kSIST FprEN ISO 11201:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMFINAL DRAFTFprEN ISO 11201March 2009ICS 17.140.20Will supersede EN ISO 11201:1995
English VersionAcoustics - Noise emitted by machinery and equipment -Measurement of emission sound pressure levels at a workstation and at other specified positions - Engineering method inan essentially free field over a reflecting plane (ISO 11201:1995,including Cor 1:1997)Acoustique - Bruit émis par les machines et équipements -Mesurage des niveaux de pression acoustique d'émissionau poste de travail et en d'autres positions spécifiées -Méthode d'expertise dans des conditions approchant cellesdu champ libre sur plan réfléchissant (ISO 11201:1995, Cor1:1997 inclus)Akustik - Geräuschabstrahlung von Maschinen undGeräten - Messung von Emissions-Schalldruckpegeln amArbeitsplatz und an anderen festgelegten Orten - Verfahrender Genauigkeitsklasse 2 für ein im wesentlichen freiesSchallfeld über einer reflektierenden Ebene (ISO11201:1995, einschließlich Cor 1:1997)This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the TechnicalCommittee CEN/TC 211.If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations whichstipulate the conditions for giving this European Standard the status of a national standard without any alteration.This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other languagemade by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has thesame 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.Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice andshall not be referred to as a European Standard.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. FprEN ISO 11201:2009: EkSIST FprEN ISO 11201:2009
FprEN ISO 11201:2009 (E) 2 Contents Page Foreword .3Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC .4Annex ZB (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC .5 kSIST FprEN ISO 11201:2009
FprEN ISO 11201:2009 (E) 3 Foreword The text of ISO 11201:1995, including Cor 1:1997 has been prepared by Technical Committee ISO/TC 43 “Acoustics” of the International Organization for Standardization (ISO) and has been taken over as FprEN ISO 11201:2009 by Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DS. This document is currently submitted to the Unique Acceptance Procedure. This document will supersede EN ISO 11201:1995. 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 EC Directives. For relationship with EC Directives, see informative Annexes ZA and ZB, which are integral parts of this document. Endorsement notice The text of ISO 11201:1995, including Cor 1:1997 has been approved by CEN as a FprEN ISO 11201:2009 without any modification. kSIST FprEN ISO 11201:2009
FprEN ISO 11201:2009 (E) 4
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 Communities 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. kSIST FprEN ISO 11201:2009
FprEN ISO 11201:2009 (E) 5 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 Communities 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.
kSIST FprEN ISO 11201:2009
kSIST FprEN ISO 11201:2009
INTERNATIONAL STANDARD IS0 11201 First edition 1995-l 2-l 5 Acoustics - Noise emitted by machinery and equipment - Measurement of emission sound pressure levels at a work station and at other specified positions - Engineering method in an essentially free field over a reflecting plane Acoustique - Bruit 6mis par /es machines et 6quipements - Mew-age des niveaux de pression acoustique d’kmission au poste de travail et en d ‘autres positions spkifikes - M&hode d/expertise dans des conditions approchan t celles du champ libre sur plan rkflkchissant Reference number IS0 11201 :I 995(E) kSIST FprEN ISO 11201:2009
IS0 11201:1995(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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. International Standard IS0 11201 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. Annexes A, B and C of this International Standard are for information only. 0 IS0 1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Intern ational Organization for Standardization Case Postale 56 l CH-121 1 Geneve 20 l Switz erland Printed in Switzerland kSIST FprEN ISO 11201:2009
0 IS0 IS0 11201:1995(E) Introduction 0.1 This International Standard specifies a method for measuring the emission sound pressure levels at a work station and at other specified positions, in the vicinity of a machine or piece of equipment, in an essen- tially free field over a reflecting plane. In general, these sound pressure levels will be equal to or lower than those that would occur when the machinery or equipment is operating in its normal surroundings. This is because the sound pressure levels are determined by excluding the ef- fects 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. 0.2 This International Standard is one of a series (IS0 11200 to IS0 11204) which specifies various methods for determining the noise emissions of a piece of machinery or equipment, or a sub-assembly of such equipment (machine under test). IS0 11200 gives guidance on the choice of the method to be used to determine the emission sound pressure levels of machinery and equipment. It also gives details of lnter- national Standards giving methods for the determination of sound power levels. kSIST FprEN ISO 11201:2009
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INTERNATIONAL STANDARD 0 IS0 IS0 11201:1995(E) Acoustics - Noise emitted by machinery and equipment - Measurement of emission sound pressure levels at a work station and at other specified positions - Engineering method in an essentially free field over a reflecting plane 1 Scope 1 .l General This International Standard specifies a method for measuring the emission sound pressure levels of machinery and equipment, at a work station and at other specified positions nearby, in an essentially free field over a reflecting plane. A work station is occu- pied by an operator. It may be located in open space in the room where the source operates, or in a cab fixed to the source, or in an enclosure remote from the source. One or more specified positions may be located in the vicinity of a work station, or in the vi- cinity of an unattended machine. As some of these positions may be occupied occasionally or regularly, they are sometimes referred to as bystander pos- itions. Emission sound pressure levels are measured as A- weighted and, if required, C-weighted peak, and in frequency bands. NOTE 1 The contents of this and related International Standards are summarized in table 1 of IS0 11200:1995. This International Standard specifies requirements for the engineering grade of accuracy on the test en- vironment and instrumentation. Corrections are ap- plied for background noise, but not for the acoustic environment. Instructions are given for the installation and operation of the machine under test and for the choice of microphone positions for the work station and for other specified positions. The purpose of the measurements is to permit comparison of the per- formance of different units of a given family of ma- chinery or equipment, under defined environmental conditions and standardized mounting and operating conditions. The data obtained may also be used for the declaration and verification of emission sound pressure levels as specified in IS0 4871. NOTE 2 At any given position in relation to a particular machine, and for given mounting and operating conditions, the emission sound pressure levels determined by the method of this International Standard will in general be lower than the directly measured sound pressure levels for the same machine in the typical workroom where it is used. This is due to reverberation and the contributions of other machines. A method of calculating the sound pressure lev- els in the vicinity of a machine operating alone in a workroom is given in IS0 11690-3. Commonly observed differences are 1 dB to 5 dB, but in extreme cases the dif- ference may be even greater. 1.2 Types of noise and noise sources The method specified in this lnternationa applicable to all types of machinery, both stationary, for indoor or outdoor use. The method is applicable to machines of l Standard is moving and II sizes, and to all types of noise as defined in IS0 2204 and IS0 12001. I .3 Test environment The type of test environment influences the accuracy of the determination of emission sound pressure lev- els. An essentially free field over a reflecting plane (indoors or outdoors) is required. kSIST FprEN ISO 11201:2009
IS0 11201:1995(E) 0 IS0 1.4 Specified positions This International Standard is applicable to work stations and other specified positions where emission sound pressure levels are to be measured. Examples of appropriate positions where measure- ments may be made include the following: a) work station located in the vicinity of the machine 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 machine under test; this is the case for many industrial trucks and earth-moving ma- chines; c) work station within a partial or total enclosure (or behind a screen) supplied by the manufacturer as an integral part of the machinery or equipment; d) work station partially or totally enclosed by the machine under test; this situation may be en- countered with some large industrial machines; bystander positions occupied by individuals not responsible for the operation of the machine under test, but who may be in its immediate vi- cinity, either occasionally or continuously; 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 11.4). 1.5 Measurement uncertainty While it is not possible to give universal values for the standard deviation of reproducibility of emission sound pressure levels at work stations, guidance is given in clause 4. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 2204:1979, Acoustics - Guide to International Standards on the measurement of airborne acoustical noise and evaluation of its effects on human beings. IS0 3744: 1994, Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering method in an essentially free field over a reflecting plane. IS0 3745:1977, Acoustics - Determination of sound power levels of noise sources - Precision methods for anechoic and semi-anechoic rooms. IS0 3746: 1995, Acoustics - Determination of sound power levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane. IS0 11200:1995, Acoustics - Noise emitted by ma- chinery and equipment - Guidelines for the use of basic standards for the determination of emission sound pressure levels at a work station and at other specified positions. IS0 12001: -‘1, Acoustics - Noise emitted by ma- chinery and equipment - Rules for the drafting and presentation of a noise test code. IEC 651: 1979, Sound level meters, I EC 804: 1985, Integrating-averaging sound level me- ters. I EC 942: 1988, Sound calibrators. IEC 1260: -*I, Electroacoustics - Octave-band and fractional-octave-band filters. 3 Definitions For the purposes of this International Standard, the following definitions apply. More detailed definitions may be found in noise test codes for specific types of machinery and equipment. 3.1 emission: Airborne sound radiated by a well- defined noise source (e.g. the machine under test). NOTE 3 Noise emission descriptors may be incorporated in 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 1) To be published. 2) To be published. (Revision of IEC 225:1966) 2 kSIST FprEN ISO 11201:2009
0 IS0 IS0 11201:1995(E) work statio na nd/or at vicinity of t he source. specified positions (if any) in the 3.2 emission sound pressure, p: The sound press- ure, at a 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. It is expressed in pascals. 3.3 emission sound pressure level, Lp: Ten times the logarithm to the base 10 of the ratio of the square of the emission sound pressure, p2 1 t), to the square of the reference sound pressure, po, measured with a particular time weighting and a particular frequency weighting, selected from those defined in IEC 651. It is expressed in decibels. The reference sound press- ure is 20 PPa. NOTE 4 Examples include: - maximum A-weighted emission sound pressure level with time-weighting F: LpAFmax; - C-weighted L /K,peak- peak emission sound pressure level: The emission sound pressure level shall be deter- mined at a specified position in accordance with either a test code for a specific family of machines or, if no test code exists, a method that complies with the IS0 11200 series. 3.3.1 time-averaged emission sound pressure level, LpeqT: Emission sound pressure level of a con- tinuous steady sound that, within a measurement time interval, T, has the same mean square sound pressure as a sound under consideration which varies with time. It is expressed in decibels and is given by the follow- ing equation: 2 L peqr= lo lg+/* P (4 7dt dB O PO . . . (1) A-weighted time-averaged emission sound pressure levels are denoted by LpAeqT, which is usually abbrevi- ated to LpA- LpAeqT shall be measured with an instru- ment which complies with the requirements of IEC 804. NOTES 5 In general, the subscripts eq and T are omitted since time-averaged emission sound pressure levels are necess- arily determined over a certain measurement time interval. 6 Equation (I) is identical to that for the familiar IS0 en- vironmental noise descriptor “equivalent continuous sound pressure level” defined in IS0 1996-I. However, the emis- sion quantity defined above is used to characterize the noise emitted by a machine under test and assumes that stan- dardized measurement and operating conditions as well as a controlled acoustical environment are used for the measurements. 3.3.2 peak emission sound pressure level, L], peak: I Highest instantaneous value of the emission sound pressure level determined over an operational cycle. It is expressed in decibels. 3.3.3 single-event emission sound pressure level, L p ,s: Time-integrated emission sound pressure level of’an isolated single sound event of specified duration T (or specified measurement time T) normalized to To=1 s. It is expressed in decibels and is given by the follow- ing equation: L p,ls = 10 Ig 1 T I To 0 2 P (0 2 PO dt dB = L peqT+ 10 Ig T dB TO . . . (2) NOTE 7 The above equation is identical to that for the familiar IS0 environmental noise descriptor “sound expo- sure level”. However, the emission quantity defined above is used to characterize a noise source and assumes that a controlled environment is used for the measurements. 3.4 impulsive noise index (impulsiveness): Quan- tity by means of which the noise emitted by a source can be characterized as “impulsive”. (See annex A.) It is expressed in decibels. 3.5 free field over a reflecting plane: Sound field in a homogeneous, isotropic medium in the half space above an infinite, rigid plane surface on which the machine under test is located. 3.6 work station; operator’s position: Position in the vicinity of the machine under test which is in- tended for the operator. 3.7 operator: Individual whose work station is in the vicinity of a machine and who is performing a work task associated with that machine. 3.8 specified position: Position defined in relation to a machine, including, but not limited to, an oper- ator’s position. 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 ma- 3 kSIST FprEN ISO 11201:2009
IS0 11201:1995(E) 0 IS0 chine, as described in the relevant noise test code, if any exists. NOTE 8 Positions located in the vicinity of a work station, or in the vicinity of an unattended machine, may be ident- if ied as ” bystander positions “. 3.9 operational period: Interval of time during which a specified process is accomplished by the machine under test (e.g. for a dishwasher when washing or rinsing or drying). 3.10 operational cycle: Specific sequence of oper- ational periods occurring while the machine under test performs a complete work cycle. Each operational period is associated with a specific process that may occur only once, or may be repeated, during the op- erational cycle (e.g. for a dishwasher when washing and rinsing and drying). 3.11 measurement time interval: Portion or a multiple of an operational period or operational cycle for which the emission sound pressure level is deter- mined or over which the maximum emission sound pressure level is searched for. 3.12 time history: Continuous recording of the emission sound pressure level, as a function of time, which is obtained during one or more operational periods of an operational cycle. 3.13 other background noise: The noise from all sources than the machine under test. NOTE 9 Background noise may include contributions from airborne sound, structure-borne vibration, and elec- trical noise in instrumentation. 3.14 background noise level: The sound pressure level measured when the machine under test is not operating. It is expressed in decibels. 3.15 background noise correction, K,: A correction term to account for the influence of background noise on the emission sound pressure level at the specified positions of the machine under test. K, is frequency dependent and is expressed in decibels. The cor- rection in the case of A-weighting, &, is to be de- termined from A-weighted measured values. 3.16 environmental indicator, K2: A term to ac- count for the influence of reflected or absorbed sound on the surface sound pressure level. K2 is frequency dependent and is expressed in decibels. In the case of A-weighting, it is denoted &A (see the IS0 3740 series). 4 Measurement uncertainty A single value of an emission sound pressure level of a noise source determined in accordance with the method specified in this International Standard is likely to differ from the true value at a fixed position by an amount within the range of the measurement uncer- tainty. The uncertainty in measurements of emission sound pressure levels arises from several factors which affect the results, some associated with en- vironmental conditions in the measurement room and others with experimental techniques. The measurement uncertainty depends on the stan- dard deviation of reproducibility and on the degree of confidence that is desired. Extensive measurement data are necessary in order to establish standard de- viations of reproducibility of emission sound pressure levels at individual positions and, in any case, these standard deviations are likely to vary considerably be- tween the many different types of machinery and equipment to which this International Standard is ap- plicable. It is therefore not possible to provide infor- mation which is universally applicable, and reference can only be made to noise test codes for relevant data on individual types of noise source. The engineering method described in this lnter- national Standard yields a higher degree of accuracy than the survey method described in IS0 11202 be- cause the measurements are carried out under controlled environmental conditions. For this engineering method, a value of the standard deviation of reproducibility equal to or less than 2,5 dB (excluding variations in operating and mounting conditions) is expected for the A-weighted emission sound pressure level of a source which emits noise with a relatively “flat” spectrum in the frequency range 100 Hz to 10 000 Hz. The given value for the standard deviation of reproducibility is a maximum value but, for a well- defined family of machines, it may be smaller. For example, for one family of woodworking machines, it has been shown that the standard deviation of reproducibility is equal to I,0 dB. NOTE 10 If the machine under test is highly directional or its spectrum has tonal components, the measurement uncertainty may be larger. The risk of this being the case can be reduced by keeping the environmental indicator (see 6.2) less than 0,5 dB. 5 Instrumentation The instrumentation system, including the micro- phone and cable, shall meet the requirements for a 4 kSIST FprEN ISO 11201:2009
0 IS0 IS0 11201:1995(E) class 1 instrument specified in IEC 651 or, in the case of integrating-averaging sound level meters, in IEC 804. For measurements in octave or one-third-octave bands, the filters shall meet the requirements of IEC 1260. Before and after each series of measurements, a sound calibrator with an accuracy of + 0,3 dB (class 1 as specified in IEC 942) shall be applied to the microphone to verify the calibration of the entire measuring system at one or more frequencies over the frequency range of interest. The compliance of the calibrator with the require- ments of IEC 942 shall be verified once a year. The compliance of the instrumentation system with the requirements of IEC 651 (or, in the case of integrating-averaging systems, with the requirements of IEC 804) shall be verified at least every 2 years. The date of the last verification of the compliance with the relevant IEC standards shall be recorded. 6 Test environment 6.1 Specified positions in free space in the vicinity of the machine under test Test environments that are suitable for measure- ments in accordance with this International Standard are a flat outdoor area or an indoor space that pro- vides an essentially free field over a reflecting plane. A laboratory hemi-anechoic room (see IS0 3745) or a flat outdoor area paved with sealed asphalt or con- crete that meets the requirements given in 6.4 and 6.5 will be satisfactory for the purposes of measure- ments given in this International Standard. Other test environments meeting the requirements given in 6.2, 6.4 and 6.5 rnay also be used. No environmental cor- rections are permitted. 6.2 Criterion for the adequacy of the test environment Ideally, the test environment should be free of re- flecting objects other than a reflecting plane so that the machine under test radiates into a free field over a reflecting plane. Annex A of IS0 3744:1994 de- scribes procedures for determining the magnitude of the environmental indicator, K2, to account for the deviations of the test environment from the ideal condition. For this International Standard, the en- vironmental indicator, &A, for a measurement surface enveloping the measurement positions, shall not ex- ceed 2 dB. NOTE 11 If it is necessary to make measurements in spaces in which K2* exceeds 2 dB, then IS0 11202 or IS0 11204 may be applicable. 6.3 Enclosed work station positions When the operator is located in an enclosed cab or in an enclosure remote from the machine under test, the cab or enclosure is regarded as an integral part of the machine under test and, consequently, sound re- flections inside the cab or enclosure are considered contributions to the emission sound pressure level. No environmental corrections are permitted. During noise emission measurements, doors and windows of the cabin or enclosure shall be open or closed as defined in the noise test code for the ma- chinery or equipment being measured. If the work station or bystander’s position of the ma- chine is located inside a cab or a cabin, an additional “conventional” work station or bystander’s position outside the cab or cabin (e.g. for maintenance) in the vicinity of machine under test shall be specified in the noise test code. 6.4 Criterion for background noise At the microphone position(s), the background noise (including win
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