Acoustics - Declaration and verification of noise emission values of machinery and equipment (ISO 4871:1996)

This International Standard - gives information on the declaration of noise emission values, - describes acoustical and product information to be presented in technical documents for the purposes of noise emission declaration, and - specifies a method for verifying the noise emission declaration. It is applicable to machinery and equipment. The values to be used for the purposes of noise emission declaration are either declared singlenumber noise emission values, L,, or declared dualnumber noise emission values, L and K. L is a noise emission value determined directly from measurements and K is the uncertainty associated with those measurements. Ld is the sum of L and K and represents an upper limit which values from repeated measurements are unlikely to exceed at a given confidence level; Ld corresponds to the stated or labelled value, Lc, defined in IS0 7574-l. The two forms of noise declaration are alternative means of representing any or all of the A-weighted sound power level, &*, the A-weighted emission sound pressure level at specified positions, LpA, and the C-weighted peak emission sound pressure level at specified positions, Lpc peak. The choice as to which of the two forms is used'in a particular case depends upon the requirements to be fulfilled. This selection is made, and guidance on the values of K is given, in the appropriate noise test code. Guidelines for determining declared noise emission values are given in annex A.

Akustik - Angabe und Nachprüfung von Geräuschemissionswerten von Maschinen und Geräten (ISO 4871:1996)

Diese Internationale Norm
⎯ gibt Hinweise zur Angabe von Geräuschemissionswerten,
⎯ beschreibt die akustischen Angaben und Produktinformationen, die in technischen Unterlagen für die
Zwecke der Geräuschemissionsangabe enthalten sein müssen und
⎯ legt ein Verfahren für die Nachprüfung der Geräuschemissionsangabe fest.
Sie ist für Maschinen und Geräte anwendbar.
Die für die Zwecke der Geräuschemissionsangabe zu verwendenden Werte sind entweder angegebene
Einzahl-Geräuschemissionswerte Ld oder angegebene Zweizahl-Geräuschemissionswerte L und K. L ist ein
direkt aus Messungen bestimmter Geräuschemissionswert, und K ist die mit diesen Messungen verbundene
Unsicherheit. Ld ist die Summe aus L und K und stellt eine Obergrenze dar, die von den Werten aus
wiederholten Messungen mit einer vorgegebenen Wahrscheinlichkeit nicht überschritten wird; Ld entspricht
dem angegebenen Wert oder Kennzeichnungswert Lc nach ISO 7574-1.
Die beiden Formen der Geräuschangabe sind Alternativen für die Darstellung des A-bewerteten
Schallleistungspegels LWA, des A-bewerteten Emissions-Schalldruckpegels an festgelegten Orten LpA und
des C-bewerteten Emissions-Spitzenschalldruckpegels an festgelegten Orten LpC,peak. Die Entscheidung
darüber, welche der beiden Darstellungsformen in einem bestimmten Fall verwendet wird, hängt von den zu
erfüllenden Anforderungen ab. Diese Auswahl wird in der zutreffenden Geräuschmessnorm getroffen; dort
finden sich auch Informationen zu den Werten von K.
Leitlinien zur Bestimmung anzugebender Geräuschemissionswerte sind in Anhang A enthalten.

Acoustique - Déclaration et vérification des valeurs d'émission sonore des machines et équipements (ISO 4871:1996)

La présente Norme internationale -- donne des informations sur la déclaration des valeurs d'émission sonore, -- décrit les informations acoustiques et celles concernant le produit à faire figurer dans les documents techniques à fin de déclaration de l'émission sonore, et -- spécifie la méthode à suivre pour vérifier les valeurs déclarées d'émission sonore. Elle s'applique aux machines et aux équipements. Les valeurs à utiliser pour la déclaration de l'émission sonore sont soit les valeurs déclarées combinées, Ld, soit les valeurs déclarées dissociées, L et K. L est une valeur d'émission sonore directement issue de mesurages et K est l'incertitude de mesure associée à ces mesurages. Ld est la somme de L et de K et représente une borne supérieure que des valeurs provenant de mesurages répétés ont, pour un niveau de confiance donné, peu de chances de dépasser. Ld correspond à la valeur annoncée ou étiquetée. Lc, dans l'ISO 7574-1. Les deux formes de déclaration constituent deux manières de représenter l'une ou l'ensemble des grandeurs suivantes: le niveau de puissance acoustique pondéré A, LWA, le niveau de pression acoustique d'émission pondéré A à des positions spécifi  450ées, LpA, le niveau de pression acoustique d'émission de crête pondéré C à des positions spécifiées, LpC,peak. Le choix d'une des deux formes dans un cas particulier donné dépend des exigences à remplir. Il est fait dans le code d'essai acoustique approprié, qui guide aussi sur les valeurs de K. Des recommandations pour déterminer les valeurs déclarées d'émission sonore sont données dans l'annexe A.

Akustika - Deklariranje in preverjanje podatkov o emisiji hrupa naprav in opreme (ISO 4871:1996)

General Information

Status
Published
Public Enquiry End Date
09-Jun-2009
Publication Date
12-Oct-2009
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-Aug-2009
Due Date
02-Nov-2009
Completion Date
13-Oct-2009

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 4871:2009
01-november-2009
1DGRPHãþD
SIST EN ISO 4871:1997
Akustika - Deklariranje in preverjanje podatkov o emisiji hrupa naprav in opreme
(ISO 4871:1996)

Acoustics - Declaration and verification of noise emission values of machinery and

equipment (ISO 4871:1996)
Akustik - Angabe und Nachprüfung von Geräuschemissionswerten von Maschinen und
Geräten (ISO 4871:1996)

Acoustique - Déclaration et vérification des valeurs d'émission sonore des machines et

équipements (ISO 4871:1996)
Ta slovenski standard je istoveten z: EN ISO 4871:2009
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
21.020 =QDþLOQRVWLLQQDþUWRYDQMH Characteristics and design of
VWURMHYDSDUDWRYRSUHPH machines, apparatus,
equipment
SIST EN ISO 4871:2009 en

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

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SIST EN ISO 4871:2009
---------------------- Page: 2 ----------------------
SIST EN ISO 4871:2009
EUROPEAN STANDARD
EN ISO 4871
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2009
ICS 21.020; 17.140.20 Supersedes EN ISO 4871:1996
English Version
Acoustics - Declaration and verification of noise emission values
of machinery and equipment (ISO 4871:1996)

Acoustique - Déclaration et vérification des valeurs Akustik - Angabe und Nachprüfung von

d'émission sonore des machines et équipements (ISO Geräuschemissionswerten von Maschinen und Geräten

4871:1996) (ISO 4871:1996)
This European Standard was approved by CEN on 20 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 4871:2009: E

worldwide for CEN national Members.
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SIST EN ISO 4871:2009
EN ISO 4871:2009 (E)
Contents Page

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

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

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

---------------------- Page: 4 ----------------------
SIST EN ISO 4871:2009
EN ISO 4871:2009 (E)
Foreword

The text of ISO 4871:1996 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 4871:2009 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 4871:1996.

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 Directive.

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

ISO 4871 is related to Essential Requirement 1.7.4.2 u) of 2006/42/EC according to which machine

manufacturers must provide information on airborne sound emission.

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 4871:1996 has been approved by CEN as a EN ISO 4871:2009 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 4871:2009
EN ISO 4871:2009 (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 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, except clause 5.d (1), 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.
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SIST EN ISO 4871:2009
INTERNATIONAL IS0
STANDARD
4871
Second edition
1996-12-15
Acoustics - Declaration and verification
of noise emission values of machinery and
equipment
Acoustique - Dklaration et vkfica bon des valeurs d ’bmission sonore
des machines et gquipements
Reference number
IS0 4871:1996(E)
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SIST EN ISO 4871:2009
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 4871 was prepared by Technical Committee
lSO/TC 43, Acoustics, Subcommittee SC 1, Noise.
This second edition cancels and replaces the first edition
(IS0 4871 :I 984), which has been technically revised.
A, B, C and D of this International Standard are for information
Annexes
only.
0 IS0 1996

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.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
---------------------- Page: 8 ----------------------
SIST EN ISO 4871:2009
0 IS0
IS0 4871:1996(E)
Introduction
Information on the acoustic noise emitted by machinery and equipment is
needed by users, planners, manufacturers and authorities. This infor-
mation is required for comparing the noise emitted by different products,
for assessing noise emissions against noise limits, for planning workplace
noise levels, as well as for checking noise reduction achievements, and
may be used for estimating requirements for workplace noise immission.
In order for machinery noise emission data to be useful, uniform methods
of measurement and declaration are necessary to achieve the following
purposes.
Measurement of noise emission
The IS0 3740 series specifies methods for determining the sound
power levels of noise sources from sound pressure level measure-
ments; the IS0 9614 series specifies methods for determining the
sound power levels from sound intensity level measurements; the
IS0 11200 series describes methods for determining emission sound
pressure levels at specified positions in the vicinity of machinery and
equipment. Many other standards give test codes for the measure-
ment of the noise emissions of individual types of machinery which
are based on these methods.
Determination of the noise emission value to be declared
The IS0 7574 series gives methods for determining declared noise
emission values which are based primarily on the sound power levels
of noise sources. For a complete presentation of declared noise
emission values, it is necessary to state the sound pressure levels at
specified positions as well as the sound power level. Because of the
possible confusion in terminology with respect to sound pressure lev-
els used to define noise immission, the term “emission sound press-
ure level” is used in this International Standard.
Presentation of declared noise emission values
It is of prime importance to declare sound power levels. It is recog-
nized, however, that information on emission sound pressure levels is
sometimes required. It is recommended, therefore, that both kinds of
quantity be declared, unless otherwise specified. Noise emission
declarations can take the form of either a single-number or dual-
number presentation; the choice is made in the noise test code ap-
propriate to the particular family.
Verification of declared noise emission values
The IS0 7574 series gives procedures for the verification of a declared
noise emission value. In that International Standard, the procedures
are applied to verification of declared sound power levels. The pro-
cedures of this International Standard are applied to the verification of
---------------------- Page: 9 ----------------------
SIST EN ISO 4871:2009
@J IS0
IS0 4871:1996(E)
both sound power levels and emission sound pressure levels. The
information in this International Standard on the verification of declared
noise emission values may be used both by a buyer of equipment to
compare the relative noise levels of various products, and by a manu-
facturer as part of a statistical quality control programme.
Requirements on the declaration of noise emission values are given in
clause 4.
As the declaration of noise emission of machinery and equipment is the
responsibility solely of the manufacturer or supplier, guidelines concerning
the declaration are found in annex A.
Requirements on the presentation of declared noise emission values are
given in clause 5 and annex B, and those on verification are given in
clause 6 and annex C.
---------------------- Page: 10 ----------------------
SIST EN ISO 4871:2009
IS0 4871:1996(E)
INTERNATIONAL STANDARD 0 ISO
Acoustics - Declaration and verification of noise
emission values of machinery and equipment
Guidelines for determining declared noise emission
1 Scope
values are given in annex A.
This International Standard
- gives information on the declaration of noise
2 Normative references
emission values,
The following standards contain provisions which,
- describes acoustical and product information to be
through reference in this text, constitute provisions
presented in technical documents for the pur-
of this International Standard. At the time of publi-
poses of noise emission declaration, and
cation, the editions indicated were valid. All standards
are subject to revision, and parties to agreements
- specifies a method for verifying the noise emission
based on this International Standard are encouraged
declaration.
to investigate the possibility of applying the most re-
cent editions of the standards indicated below.
It is applicable to machinery and equipment.
Members of IEC and IS0 maintain registers of cur-
rently valid International Standards.
The values to be used for the purposes of noise
emission declaration are either declared single-
IS0 3740:1980, Acoustics - Determination of sound
number noise emission values, L,, or declared dual-
power levels of noise sources - Guidelines for the
number noise emission values, L and K. L is a noise
use of basic standards and for the preparation of noise
emission value determined directly from measure-
test codes.
ments and K is the uncertainty associated with those
measurements. Ld is the sum of L and K and rep-
Determination of sound
IS0 3741: ---I), Acoustics -
resents an upper limit which values from repeated
power levels of noise sources using sound
measurements are unlikely to exceed at a given con-
pressure - Precision methods for reverberation
fidence level; Ld corresponds to the stated or labelled
rooms.
value, Lc, defined in IS0 7574-l.
IS0 3743-l :I 994, Acoustics - Determination of
The two forms of noise declaration are alternative
sound power levels of noise sources - Engineering

means of representing any or all of the A-weighted methods for small, movable sources in reverberant

the A-weighted emission
sound power level, &*, fields - Part 1: Comparison method for hard-walled
sound pressure level at specified positions, LpA, and test rooms.
the C-weighted peak emission sound pressure level
IS0 3743-2:1994, Acoustics - Determination of
at specified positions, Lpc peak. The choice as to which
sound power levels of noise sources using sound
of the two forms is used ’in a particular case depends
pressure - Engineering methods for small, movable
upon the requirements to be fulfilled. This selection
sources in reverberant fields - Part 2: Methods for
is made, and guidance on the values of K is given, in
special reverberation test rooms.
the appropriate noise test code.
1) To be published. (Revision of IS0 3741:1988 and IS0 3742:1988)
---------------------- Page: 11 ----------------------
SIST EN ISO 4871:2009
IS0 4871:1996(E) 0 IS0
IS0 3744: 1994, Acoustics
- Determination of sound IS0 11203:1995, Acoustics - Noise emitted by ma-
power levels of noise sources using sound pressure
chinery and equipment - Determination of emission

- Engineering method in an essentially free field over sound pressure levels at a work station and at other

a reflecting plane.
specified positions from the sound power level.
IS0 3745: 1977, Acoustics - Determination of sound
IS0 11204:1995, Acoustics - Noise emitted by ma-
power levels of noise sources - Precision methods
chinery and equipment - Measurement of emission
for anechoic and semi-anechoic rooms.
sound pressure levels at a work station and at other
specified positions - Method requiring environmental
IS0 3746: 1995, Acoustics - Determination of sound
corrections.
power levels of noise sources using sound pressure
- Survey method using an enveloping measurement IEC 651:1979, Sound
level meters, and
surface over a reflecting plane. Amendment I : 1993.
IS0 3747: 1987, Acoustics - Determination of sound
I EC 804: 1985, Integrating-averaging sound level
power levels of noise sources - Survey method us-
meters, and Amendment I:1989 and Amendment
ing a reference sound source.
2:1993.
IS0 7574-l : 1985, Acoustics - Statistical methods for
determining and verifying stated noise emission val-
3 Definitions
ues of machinery and equipment - Part I: General
considerations and definitions.
For the purposes of this International Standard, the
followin g definitions apply.
IS0 7574-2:1985, Acoustics - Statistical methods for
determining and verifying stated noise emission val-
3.1 machinery and equipment: An assembly of
ues of machinery and equipment - Part 2: Methods
linked parts or components with the appropriate ac-
for stated values for individual machines.
tuators, control and power circuits, etc., joined to-
gether for a specific application. Also included in this
IS0 7574-4: 1985, Acoustics - Statistical methods for
definition is an assembly of machines which, in order
determining and verifying stated noise emission val-
to achieve the same end, are arranged and controlled
ues of machinery and equipment - Part 4: Methods
so that they function as a whole.
for stated values for batches of machines.
3.2 family of machinery or equipment: Machinery
IS0 9614-I :I 993, Acoustics - Determination of
or equipment of similar design or type, intended to
sound power levels of noise sources using sound in-
perform the same functions.
tensity - Part 1: Measurement at discrete points.
3.3 batch (lot) of equipment: A number of units of
IS0 9614-2:1996, Acoustics - Determination of
machinery or equipment of the same family produced
sound power levels of noise sources using sound in-
in quantity, manufactured to the same technical
Part 2: Measurement by scanning.
tensity -
specifications and characterized by the same declared
noise emission values.
IS0 11200: 1995, Acoustics - Noise emitted by ma-
chinery and equipment - Guidelines for the use of
NOTE 1 The batch may be either an entire production
basic standards for the determination of emission
series or a portion thereof.
sound pressure levels at a work station and at other
specified positions.
3.4 operating mode: A condition in which the ma-
chinery or equipment is performing its intended func-
IS0 11201 :I 995, Acoustics - Noise emitted by ma-
tion for the purpose of determining its noise emission
chinery and equipment - Measurement of emission
values.
sound pressure levels at a work station and at other
Engineering method in an es-
specified positions. -
3.5 emission: Airborne sound radiated by a well-
sentially free field over a reflecting plane.
defined noise source (e.g. the machine under test)
under specified operating and mounting conditions.
IS0 I 1202:1995, Acoustics - Noise emitted by ma-
Measurement of emission
chinery and equipment -
NOTE 2 Emission values may be incorporated in a prod-
sound pressure levels at a work station and at other
uct label and/or product specification. The basic noise
specified positions - Survey method in situ.
emission quantities are the sound power level of the source
itself and the emission sound pressure levels at a work
---------------------- Page: 12 ----------------------
SIST EN ISO 4871:2009
0 IS0
IS0 4871:1996(E)
station and/or at ot
her specified positions (if any) in the vi- NOTES
cinity of the source
5 In general, the subscripts “eq” and “T” are omitted
since time-averaged emission sound pressure levels are
3.6 emission sound pressure, p: The sound press-
necessarily determined over a certain measurement time
ure, at a specified position near a noise source, when
interval.
the source is in operation under specified operating
6 Equation (I) is identical to that for the familiar IS0 envi-
and mounting conditions on a reflecting plane surface,
ronmental noise descriptor “equivalent continuous sound
excluding the effects of background noise and of re-
pressure level” defined in IS0 1996-I. However, the emis-
flections other than those from the plane or planes
sion quantity defined above is used to characterize the noise
permitted for the purpose of the test. It is expressed
emitted by a machine under test and assumes that stan-
in pascals.
dardized measurement and operating conditions as well as
a controlled acoustical environment are used for the
measurements.
3.7 emission sound pressure level, Lp: Ten times
the logarithm to base IO of the ratio of the square of
3.9 sound power, W: The rate per unit time at
the emission sound pressure, p* t), to the square of
4 which airborne sound energy is radiated by a source.
the reference sound pressure, po, measured with a
It is expressed in watts.
particular time weighting and a particular frequency
weighting, se ected from those defined in IEC 651. It
3.10 sound power level, L,: Ten times the logar-
is expressed n decibels. The reference sound press-
ithm to the base IO of the ratio of the sound power
ure is 20 PPa,
radiated by the source under test to the reference
sound power. It is expressed in decibels.
NOTES
The frequency weighting or the width of the fre-
3 Examples include:
quency band used shall be indicated. The reference
- maximum A-weighted emission sound pressure level
sound power is I pW (IO- ‘* W).
with time weighting F: L,,AFmax;
NOTE 7 For example, the A-weighted sound power level
- C-weighted peak emission sound pressure level,
is &*.
pC,peak-
3.11 noise emission value: A general term by
4 The single-event emission sound pressure level is
which any one or more of the A-weighted sound
sometimes used and is defined in IS0 11201 to IS0 11204.
power level, b*, or the A-weighted time-averaged
emission sound pressure level, LpA, or the C-weighted
The emission sound pressure level shall be deter-
peak emission sound pressure level, Lpc peak, is in-
mined at a specified position and in accordance with
ferred.
either a test code for a specific family of machines or,
if no code exists, a method that complies with the
3.12 measured noise emission value, L: The A-
IS0 11200 series.
weighted sound power level, or the A-weighted
time-averaged emission sound pressure level, or the
3.8 time-averaged emission sound pressure
C-weighted peak emission sound pressure level, as
Emission sound pressure level of a con-
level, LpeqT:
determined from measurements. Measured values
tinuous steady sound that, within a measurement
may be determined either from a single machine or
time interval, T, has the same mean square sound
from the average of a number of machines, and are
pressure as a sound under consideration which varies
not rounded.
with time. It is expressed in decibels.
3.13 noise emission declaration: Information on
It is given by the following equation:
the noise emitted by the machine, given by the
manufacturer or supplier in technical documents or
P (4
1 T
other literature concerning noise emission values. The
L IO dt dB . . .
Ig (1)
peqT =
T 0
noise emission declaration may take the form of ei-
ther the declared single-number noise emission value
or the declared dual-number noise emission value.
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- 3.14 uncertainty, K: Value of the measurement un-

ment which - complies with the requirements of certainty associated with a measured noise emission

IEC 804. value. It is expressed in decibels.
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SIST EN ISO 4871:2009
CJ IS0
IS0 4871:1996(E)
NOTE 8 Guidance on appropriate values for K is given in
application of the same noise emission measurement
annex A.
method on the same noise source at different times
and under different conditions (different laboratory,
3.15 declared single-number noise emission
different operator, different apparatus). The standard

value, Ld: The sum of a measured noise emission deviation of reproducibility, therefore, includes the

value and the associated uncertainty, rounded to the standard deviation of repeatability.

nearest decibel:
3.22 standard deviation of production, ap: Stan-
Ld=L+K
dard deviation of noise emission values obtained on
different equipment from a batch of the same family,
NOTE 9 IS0 9296 requires that the declared A-weighted
using the same noise emission measurement method
sound power level, bAdI of computers and business equip-
under repeatability conditions (same laboratory, same
ment be expressed in bels using the identity 1 B = 10 dB,
operator, same apparatus).
rounded to the nearest 0,l B.
3.23 total standard deviation a,: Square root of the
3.16 declared dual-number noise emission value,
sum of the squares of the standard deviation of
L and K: A measured noise emission value, L, and its
reproducibility and the standard deviation of pro-
associated uncertainty K, both rounded to the nearest
duction:
decibel.
2 2
NOTE 10 If a specific noise test code requires that the
01 =
OR + OP
mean emission sound pressure level from a number of
specified positions be declared, it is denoted by LpAm.
3.24 reference standard deviation, GM: A total
standard deviation specified for the family of machin-
3.17 work station; operator ’s position: A position
et-y and equipment, which is considered typical for
in the vicinity of the machine under test which is in-
batches of equipment from this family.
tended for the operator.
NOTE 13 The use of a fixed value for GM for each family
3.18 operator: An individual whose work station is
enables the application of a statistical method to deal with
in the vicinity of a machine and who is performing a
small sample sizes. If the total standard deviation, Q~, is dif-
work task associated with that machine.
ferent from the reference standard deviation, aM, the risk
of rejection should be estimated on the basis of both stan-
dard deviations, ot and aM.
3.19 specified position: A position defined in re-
lation to a machine, including, but not limited to, an
Typical values of aM range from I,5 dB to 3 ’5 dB if the
operator ’s position. The position can be a single, fixed
measurement test code is of grade 1 or grade 2 accuracy
point, or a combination of points along a path or on a
(employing precision or engineering methods, respectively);
if the test code is of grade 3 accuracy (employing a survey
surface located at a specified distance from the ma-
method), then typical values of oM may be much higher.
chine, as described in the relevant noise test code, if
Extensive testing may be required to establish the value of
any.
aM for a family of machines.
NOTE 11 In IS0 7779 and IS0 9296, positions on the
path are identified as “bystander positions ”.
4 Noise emission declarations
3.20 standard deviation of repeatability, a,.: Stan-
dard deviation of noise emission values obtained un-
Noise emission declarations shall consist of either
der repeatability conditions; that is the repeated
declared single-number noise emission values or de-

application of the same noise emission measurement clared dual-number noise emission values. The selec-

method on the same noise source within a short in-
tion of the appropriate form of noise declaration is
terval of time under the same conditions (same labo-
made in the relevant noise test code. The noise

ratory, same operator, same apparatus). emission values to be declared are one or more of the

A-weighted sound power level, &*, the A-weighted
In this International Standard, the symbol 0 is
NOTE 12
time-averaged emission sound pressure level, LpA, or
used for a standard deviation of a population and the symbol
the C-weighted peak emission sound pressure level,
s for a standard deviation of a sample.
L from measurements of the highest practi-
nC.Deakl
c&k grade of accuracy.
3.21 standard deviation of reproducibility, OR:
Standard deviation of noise emission values obtained
NOTE 14 It is recommende d to use engineering grade

under reproducibility conditions; that is, the repeated accuracy (grade 2 ) or better.

---------------------- Page: 14 ----------------------
SIST EN ISO 4871:2009
0 IS0
IS0 4871:1996(E)
NOTES
Noise emission values shall be declared for each op-
erating mode specified in the appropriate noise test
16 The manufacturer or supplier may optionally provide
code. If no noise test code exists, the guidance given
frequency band data, in addition to the information which
in the relevant basic standards (the IS0 3740 or
has to be declared.
IS0 9614 series, and the IS0 11200 series) shall be
followed.
17 The preferred declared noise emission quantity is the
declared A-weighted sound power level, either ,&Ad or &,A
The noise emission declarations shall be such as to
The A-weighted sound power level is the basic
and KwA.
allow the values to be verified according to the pro-
noise emission quantity adopted in the IS0 7574 series, and
the one which most accurately tracks changes in noise
cedures of this International Standard. Guidelines for
emission from one piece of machinery and equipment to
determination of declared noise emission values,
another.
consistent with IS0 7574-Z and IS0 7574-4, are given
in annex A.
18 Noise declaration for computer and business equip-
ment should be in accordance with IS0 9296.
NOTE 15 The specifications of IS0 7574-Z and
IS0 7574-4, giving greater det
...

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