EN ISO 11546-1:2009

Acoustics - Determination of sound insulation performances of enclosures - Part 1: Measurements under laboratory conditions (for declaration purposes) (ISO 11546-1:1995)

Specifies laboratory methods for the determination of the sound insulation performance of small machine enclosures. Does apply to a total enclosure only.

Akustik - Bestimmung der Schalldämmung von Schallschutzkapseln - Teil 1: Messungen unter Laborbedingungen (zum Zweck der Kennzeichnung) (ISO 11546-1:1995)

Dieser Teil von ISO 11546 beschreibt Laborverfahren für die Bestimmung der Schalldämmung (Einfügungs-dämm-Maß) kleiner Schallschutzkapseln für Maschinen.
Er gilt nur für eine vollständige Schallschutzkapsel und nicht für die einzelnen Wände, aus denen sie hergestellt wurde.
ANMERKUNG 1   Die Schalldämmungen der Kapselteile, wie z. B. der Wandelemente, Türen, Fenster, Schalldämpfer usw., sollten nach anderen, diese betreffenden Normen gemessen werden.
ANMERKUNG 2   Ähnliche Normen betreffen die Messung der Geräuschminderung von Schallschutzkapseln im Einsatzfall (ISO 11546 2) und von Kabinen (ISO 11957).
Die in diesem Teil von ISO 11546 beschriebenen Messverfahren beruhen auf den Internationalen Normen der Reihen ISO 3740, ISO 9614 und ISO 11200 (siehe Tabelle 1). In Abhängigkeit vom gewählten Verfahren wird die Schalldämmung der Schallschutzkapsel (Einfügungsdämm Maß) als Schallleistungs  oder Schalldruck-pegelminderung bestimmt. Es werden Verfahren beschrieben, bei denen die Kapsel die tatsächliche Schall-quelle (Maschine) umschließt. Wo diese Verfahren nicht anwendbar sind, kann alternativ ein Reziprozitäts-verfahren (siehe Begriffe 3.11 und 7.2) oder eine Ersatzschallquelle angewendet werden.
Dieser Teil von ISO 11546 ist uneingeschränkt anwendbar auf freistehende Schallschutzkapseln mit einem Volumen von weniger als 2 m3. Wird die tatsächliche Schallquelle verwendet, können Schallschutzkapseln mit Volumina von mehr als 2 m3 gemessen werden, wenn die Anforderungen der in Bezug genommenen Norm hinsichtlich des höchstzulässigen Volumens erfüllt sind. Das Verfahren unter Benutzung der tatsächlichen Schallquelle kann auf beliebig konstruierte Schallschutzkapseln, z. B. integrierte Schallschutzkapseln, angewendet werden.
Wenn das Reziprozitätsverfahren oder das Verfahren mit Ersatzschallquelle benutzt wird, ist das höchst-zulässige Volumen der Schallschutzkapsel auf 2 m3 begrenzt. Diese Verfahren sind nicht auf hautenge Schallschutzkapseln anwendbar.
(...)

Acoustique - Détermination de l'isolement acoustique des encoffrements - Partie 1: Mesurages dans des conditions de laboratoire (aux fins de déclaration) (ISO 11546-1:1995)

La présente partie de l'ISO 11546 prescrit des méthodes de laboratoire pour la détermination de l'isolement acoustique (perte d'insertion) de petits encoffrements de machines. Elle s'applique uniquement à un encoffrement complet et non pas aux panneaux individuels qui le composent.  
NOTES 1 L'isolement acoustique des panneaux constitutifs d'encoffrements tels que: éléments de paroi, portes, fenêtres, silencieux, etc. devrait être mesuré suivant les normes appropriées. 2 Il existe des normes relatives à la détermination de l'isolement acoustique des encoffrements in situ (ISO 11546-2), et des cabines (ISO 11957). Les méthodes de mesurage prescrites dans la présente partie de l'ISO 11546 sont basées sur les Normes internationales des séries ISO 3740, ISO 9614 et ISO 11200 (voir tableau 1). Suivant la méthode choisie, l'isolement acoustique de l'encoffrement (perte d'insertion) est exprimé en termes de réduction du niveau de puissance acoustique ou du niveau de pression acoustique. Les méthodes sont données pour des mesurages effectués lorsque l'encoffrement entoure la source sonore réelle (machine). Lorsque ces méthodes ne sont pas applicables, d'autres mesurages peuvent être effectués en recourant à une méthode de réciprocité (voir définition 3.11 et paragraphe 7.2) ou à une source sonore artificielle. La présente partie de l'ISO 11546 s'applique sans restriction à des encoffrements autoporteurs d'un volume inférieur à 2 m3. Si la source sonore réelle est utilisée, l'isolement acoustique d  848es encoffrements dont le volume dépasse 2 m peut être déterminé à condition de satisfaire aux exigences relatives au volume maximal autorisé par la norme utilisée. La méthode avec source sonore réelle est applicable à tous les types d'encoffrements, par exemple aux encoffrements fixés à la machine. Lorsque l'on recourt à la méthode de réciprocité ou à la méthode avec source sonore artificielle, le volume maximal de l'encoffrement est limi

Akustika - Ugotavljanje zvočno izolacijskih lastnosti okrovov - 1. del: Merjenje v laboratorijskih razmerah (za namen označevanja) (ISO 11546-1:1995)

General Information

• Status: Published
• Publication Date: 18-Aug-2009
• Withdrawal Date: 27-Feb-2010
• ICS: 13.340.20 - Head protective equipment
• ICS: 17.140.01 - Acoustic measurements and noise abatement in general
• ICS: 17.140.20 - Noise emitted by machines and equipment
• Technical Committee: CEN/TC 211 - Acuostics
• Drafting Committee: CEN/TC 211 - Acuostics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 19-Aug-2009
• Due Date: 25-Sep-2010
• Completion Date: 19-Aug-2009
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Directive: 89/392/EEC - Machinery - Safety of machinery: general essential health and safety requirements
• Directive: 98/37/EC - Machinery
• Mandate: M/BC/CEN/88/13 - Standardization request to CEN/CENELEC relating to machinery
• Ref Project: SIST EN ISO 11546-1:2009 - Acoustics - Determination of sound insulation performances of enclosures - Part 1: Measurements under laboratory conditions (for declaration purposes) (ISO 11546-1:1995)

Relations

• Replaces: EN ISO 11546-1:1995 - Acoustics - Determination of sound insulation performances of enclosures - Part 1: Measurements under laboratory conditions (for declaration purposes) (ISO 11546-1:1995)
• Effective Date: 22-Aug-2009

Overview

EN ISO 11546-1:2009 (ISO 11546-1:1995) specifies laboratory methods for determining the sound insulation performance (insertion loss) of small machine enclosures under controlled conditions for declaration purposes. It applies to a total enclosure only (not individual panels) and is intended primarily for freestanding enclosures with volumes less than 2 m³. When the actual sound source is used, larger volumes may be accommodated subject to the referenced standards’ limits. The standard was adopted by CEN and supports conformity with relevant EU machinery directives.

Key topics and requirements

• Measurement scope
  • Determination of insertion loss expressed as reductions in sound power or sound pressure levels.
  • Laboratory conditions that conform to referenced ISO/IEC standards.
• Choice of measurement method
  • Methods using the actual sound source (machine inside the enclosure).
  • Methods for enclosures without the actual source: reciprocity method and artificial sound source method.
  • Limitations: reciprocity and artificial source methods are generally limited to enclosures ≤ 2 m³ and are not suitable for close‑fitting enclosures.
• Instrumentation and procedures
  • Instrumentation and test environment aligned with series standards (ISO 3740, ISO 9614, ISO 11200 and related IEC standards for meters, filters and calibrators).
  • Requirements for measuring sound power, sound pressure at specified positions, and environmental corrections when needed.
• Data handling
  • Procedures for weighted sound power insulation, estimation of noise insulation for a specific noise spectrum, and calculation of measurement uncertainty.
  • Detailed lists of information to be recorded and reported about the test object, conditions, instrumentation and acoustical data.
• Annexes
  • Practical aids such as an artificial sound source description, example source spectrum, and a worked example for estimating insulation for a given spectrum.

Applications

• Declaring the acoustic performance of machine enclosures for product datasheets, procurement, and regulatory compliance.
• Designing and validating noise‑control enclosures for industrial machinery, HVAC units and small equipment.
• Comparing enclosure concepts during product development to quantify expected noise reduction (insertion loss).

Who uses this standard

• Acoustic consultants and test laboratories performing laboratory measurements.
• Product designers and R&D teams for machinery and noise control products.
• Compliance and certification bodies assessing conformity with EU machinery directives and noise‑abatement requirements.

Related standards

• ISO 11546-2 (in situ measurements for acceptance/verification)
• ISO 11957 (cabins)
• ISO 3740 series, ISO 3743, ISO 3741, ISO 3742, ISO 11204, ISO 9614, ISO 11200
• Relevant IEC standards for sound level meters, calibrators and filters

Keywords: EN ISO 11546-1:2009, sound insulation, acoustics, machine enclosures, laboratory measurements, insertion loss, reciprocity method, artificial sound source, sound power, sound pressure.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2009
1DGRPHãþD
SIST EN ISO 11546-1:1997
$NXVWLND8JRWDYOMDQMH]YRþQRL]RODFLMVNLKODVWQRVWLRNURYRYGHO0HUMHQMHY
ODERUDWRULMVNLKUD]PHUDK]DQDPHQR]QDþHYDQMD,62
Acoustics - Determination of sound insulation performances of enclosures - Part 1:
Measurements under laboratory conditions (for declaration purposes) (ISO 11546-
1:1995)
Akustik - Bestimmung der Schalldämmung von Schallschutzkapseln - Teil 1: Messungen
unter Laborbedingungen (Zum Zweck der Kennzeichnung) (ISO 11546-1:1995)
Acoustique - Détermination de l'isolement acoustique des encoffrements - Partie 1:
Mesurages dans des conditions de laboratoire (aux fins de déclaration) (ISO 11546-
1:1995)
Ta slovenski standard je istoveten z: EN ISO 11546-1:2009
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 11546-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2009
ICS 17.140.01 Supersedes EN ISO 11546-1:1995
English Version
Acoustics - Determination of sound insulation performances of
enclosures - Part 1: Measurements under laboratory conditions
(for declaration purposes) (ISO 11546-1:1995)
Acoustique - Détermination de l'isolement acoustique des Akustik - Bestimmung der Schalldämmung von
encoffrements - Partie 1: Mesurages dans des conditions Schallschutzkapseln - Teil 1: Messungen unter
de laboratoire (aux fins de déclaration) (ISO 11546-1:1995) Laborbedingungen (Zum Zweck der Kennzeichnung) (ISO
11546-1:1995)
This European Standard was approved by CEN on 3 August 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 11546-1:2009: E
worldwide for CEN national Members.

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

Foreword
The text of ISO 11546-1:1995 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 11546-1:2009 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 January 2010, and conflicting national standards shall be withdrawn at
the latest by January 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 11546-1:1995.
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 11546-1:1995 has been approved by CEN as a EN ISO 11546-1:2009 without any
modification.
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.
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.
INTERNATIONAL ISO
STANDARD
First edition
1995-12-15
Acoustics - Determination of Sound
insulation performances of enclosures -
Part 1:
Measurements under laboratory conditions
(for declaration purposes)
Acoustique - Determination de I’isolement acoustique des
encoffremen ts -
Partie 1: Mesurages dans des conditions de laboratoire (aux fins de
dklara tion)
Reference number
ISO 11546-1:1995(E)
ISO 11546=1:1995(E)
Contents
Page
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Definitions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Choice of measurement method
5 Instrumentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Test methods applicable to enclosures with the actual Sound
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Source
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.1 General
insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.2 Determination of Sound power
6.3 Determination of Sound pressure insulation at a specified
Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-.
7 Test methods applicable to enclosures without the actual Sound
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Source
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1 General
7.2 Reciprocity method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3 Artificial Sound Source method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weighted Sound power insulation and Sound pressure insulation
7.4
(reciprocity method) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*. 8
7.5 Estimated noise insulation due to the enclosure for a specific
noise spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Uncertainty
. . . . . . . . . . . . . . . . .~. 8
9 Information to be recorded
.................. ............................................................
9.1 Test Object
. . . . . . . . . . . . . . . . . . . . . . . . . . .*. 8
9.2 Test conditions
........................................................... 9
9.3 I nstrumentation .
9.4 Acoustical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
9.5 Further information
0 ISO 1995
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1 211 Geneve 20 0 Switzerland
Printed in Switzerland
ii
0 ISO ISO 1154601:1995(E)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 Information to be reported
Annexes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
A Artificial Sound Source . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
B Example of a Source spectrum
C Estimated noise insulation due to the enclosure for a specific
noise spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . .*.
D Bibliography
0 ISO
ISO 11546-1:1995(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The work
of preparing International Standards is normally carried out through ISO
technical committees. Esch member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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 ISO 11546-1 was prepared by Technical Committee
lSO/TC 43, Acoustics, Subcommittee SC 1, Noise.
ISO 11 546 consists of the following Parts, under the general title Aco IUS-
Determination of Sound insula tjon performances of enclosures:
tks -
- Part 7: Measuremen ts under laboratoty conditions (for declaration
purposes)
- Part 2: Measuremen ts in sjtu (for acceptance and verification pur-
poses)
Annex A forms an integral part of this part of ISO 11546. Annexes B, C
and D are for information only.

ISO 11546-1:1995(E)
INTERNATIONAL STANDARD 0 ISO
Acoustics - Determination of sound insulation
performances of enclosures -
Part 1:
Measurements under laboratory conditions (for declaration
purposes)
This part of ISO 11546 is applicable without any re-
1 Scope
strictions to freestanding enclosures with volumes
less than 2 m3. If the actual Sound Source is used, the
Sound insulation Performance of enclosures with vol-
umes exceeding. 2 m3 tan be determined provided
that the requirements concerning maximum permiss-
This part of ISO 11546 specifies laboratory methods
ible volume in the Standard used are fulfilled. The ac-
for the determination of the Sound insulation per-
tual Sound Source method is applicable for any kind
formante (insertion loss) of small machine enclos-
of enclosure design, for example enclosures fixed to
Ures.
the machine.
lt applies to a total enclosure only and not to the in-
When the reciprocity method or the artificial Sound
dividual Panels from which the enclosure is made.
Source method is used, the maximum volume of the
NOTES enclosure is limited to 2 m3. These methods are not
applicable to close-fitting enclosures.
1 Sound insulation for enclosure Panels such as wall el-
ements, doors, windows, silencers, etc. should be
The wording “laboratory conditions” used in the title
measured in accordance with other relevant Standards.
of this part of ISO 11546 indicates that test conditions
and test environment (indoor or outdoor) fully conform
2 Related Standards concern noise-attenuation measure-
to the respective International Standards given in
ments of enclosures in sjtu (ISO 11546-2) and cabins
table 1.
(ISO 11957).
The measurement methods specified in this part of
ISO 11546 are based on International Standards in the
2 Normative references
series ISO 3740, ISO 9614 and ISO 11200 (see
table 1). Depending on the method Chosen, the Sound
The following Standards contain provisions which,
insulation Performance (insertion loss) of the enclos-
through reference in this text, constitute provisions
ure is determined in terms of the reduction of Sound
of this part of ISO 11546. At the time of publication,
power level or Sound pressure level. Methods are
the editions indicated were valid. All Standards are
given for measurements where the enclosure sur-
subject to revision, and Parties to agreements based
rounds the actual Sound Source (machine). Where
on this part of ISO 11546 are encouraged to investi-
these methods are not practicable, alternative
gate the possibility of applying the most recent edi-
measurements tan be performed using a reciprocity
tions of the Standards indicated below. Members of
method (see definition 3.11 and subclause 7.2) or an
IEC and ISO maintain registers of currently valid
artificial Sound Source.
International Standards.
ISO 11546-1:1995(E) 0 ISO
ISO 140-6: 1978, Acoustics - Measurement of Sound specified positions - Engineering method
in an es-
insulation in buildings and of building elements - sentially free field over a re flec ting plane.
Part 6: Laboratory measurements of impact Sound
ISO 11204:1995, Acoustics - Noise emitted by ma-
insulation of floors.
chinery and equipment - Measuremen t of emission
ISO 717-1 :-J, Acoustics - Rating of Sound insu- Sound pressure levels at a work Station and at other
lation in buildings and of building elemen ts - Part 7: specified positions - Method requiring environ-
Airborne Sound insulation. mental corrections.
ISO 3741:1988, Acoustics - Determination of Sound
I EC 651: 1979, Sound level meters.
power levels of noise sources - Precision methods
Integrating-averaging Sound level
I EC 804: 1985,
for broad-band sources in reverbera tion rooms.
me ters.
ISO 3742:1988, Acoustics - Determination of Sound
I EC 942: 1988, Sound calibrators.
power levels of noise sources - Precision methods
for discre te-frequency and narro w-band sources in
I EC 1 260:-4), Electroacoustics - Octave-band and
reverbera tion rooms.
fractional-octave-band filters.
ISO 3743-1 :1994, Acoustics - Determination of
Sound power levels of noise sources - Engineering
methods for small, movable sources in reverberant
3 Definitions
- Part 1: Comparison method for hard-walled
fields
tes t rooms.
For the purposes of this part of ISO 11546, the fol-
lowing definitions apply.
ISO 3743-2:1994, Acoustics - Determination of
Sound power levels of noise sources using Sound
3.1 A-weighting: Frequency weighting as defined
pressure - Engineering methods for small, movable
in IEC 651.
sources in reverberant fields - Part 2: Methods for
special reverbera tion tes t rooms.
3.2 enclosure: A structure enveloping a noise
Source (machine), designed to protect the environ-
ISO 3744:1994, Acoustics - Determination of Sound
ment from this noise Source (machine).
power levels of noise sources using Sound pressure
- Engineering method in an essentially free field over
NOTE 3 An enclosure tan be, for example, a freestanding
a reflecting plane.
structure terminated on the floor or a structure more or less
fixed to the machine. (Concerning enclosures fixed to the
ISO 4871: -*), Acoustics - Declara tion and verifica-
machine, see clause 4.)
tion of noise emission values of machinery and
equipmen t.
3.3 Sound pressure level, Ll,: Ten times the logar-
ithm to the base IO of the ratio of the Square of the
ISO 9614-1 :1993, Acoustics - Determination of
Sound pressure of a Sound to the Square of the ref-
Sound power levels of noise sources using Sound in-
erence Sound pressure. Sound pressure levels are
Part 1: Measuremen t at discrete Points.
tensity -
expressed in decibels. The reference Sound pressure
is 20 PPa (2 x 10W5 Pa).
ISO 9614-2:-3), Acoustics - Determination of Sound
power levels of noise sources using Sound intensity
3.4 average Sound pressure level, q,: Mean-Square
- Part 2: Measurement by scanning.
of the Sound pressure levels:
ISO 11201 :1995, Acoustics - Noise emitted by ma-
dB
OJLPl + 1 OW2 + . + 1 (p,m
L,=lOlg Io
chinery and equipmen t - Measurement of emission
n
i i
Sound pressure levels at a work Station and at other
where Lpl, L+, . . . Lpn are the Sound pressure levels,
I
in decibels, to be averaged.
1) To be published. (Revision of ISO 717-1 :1982 and ISO 717-3:1982)
2) To be published. (Revision of ISO 4871:1984)
3) To be published.
4) To be published. (Revision of IEC 225:1966)
ISO 11546=1:1995(E)
reduction index is replaced by the sound power insu-
3.5 Sound power level, &: Ten times the logarithm
lation, D,. It is expressed in decibels.
to the base 10 of the ratio of a given Sound power to
the reference Sound power. lt is expressed in deci-
bels. The reference Sound power is 1 pW (IO- ‘* W). 3.15 fill ratio, 4: Ratio of the volume of the Source
in an enclosure to the interior volume of that enclos-
ure.
3.6 average Sound power level, &,+ Mean-Square
of the Sound power levels:
In cases where the shape of the Source complicates
-
dB
1 oo,lL”l + 1 o”“b2 + . . . + 1 o”‘lL”n
calculation of the Source volume, the volume of a
Lw= 10 Ig
n
i 1 reference box determined in accordance with
ISO 3744 tan be used.
L,, are the Sound power levels, in
where bl, bz, . . . .
decibels, to be averaged.
3.16 leak ratio, 6: Ratio between the area of all
openings of the enclosure and the total interior sur-
3.7 Sound power insulation, D,: Reduction in
face area of the enclosure (including openings).
Sound power level obtained due to the enclosure
(octave bands or one-third-octave bands). lt is ex- NOTES
pressed in decibels.
4 Openings provided with sufficiently efficient sound-
attenuating silencers are not regarded as openings with re-
3.8 A-weighted Sound power insulation, DwA:
spect to the Ieak ratio.
Reduction in the A-weighted Sound power level ob-
tained due to the enclosure for the actual Sound
5 The reciprocal value of the leak ratio is designated the
Source spectrum. lt is expressed in decibels.
seal ratio, Y (Y = 1/8).
3.9 Sound pressure insulation, DP: Reduction in the
Sound pressure level at a specified Position due to the
4 Choice of measurement method
enclosure (octave bands or one-third-octave bands). lt
is expressed in decibels.
Accurate values of the Sound insulation Performance
of an enclosure tan only be obtained when the
3.10 A-weighted Sound pressure insulation, DPA:
measurements take place with the actual Sound
Reduction in A-weighted Sound pressure Ievel at a
Source for which the enclosure is designed. Thus,
specified Position due to the enclosure for the actual
whenever practicable, methods using the real Source
Sound Source spectrum. lt is expressed in decibels.
shall be used. If the enclosure is fixed or otherwise
connected to the Sound Source, the Sound insulation
3.11 Sound pressure insulation (reciprocity
Performance tan only be determined with the actual
method), Dg Differente between the averaged
Sound Source.
Sound pressure Ievel in an external diffuse Sound field
If the actual Sound Source cannot be used, a
and the averaged Sound pressure level inside an en-
reciprocity method using an external Sound field to
closure located in this field. lt is expressed in decibels.
determine the Sound insulation Performance is the
preferred method. In cases where neither the real
3.12 estimated noise insulation due to the en-
Sound Source method nor the reciprocity method are
closure, DwA,, DPA e or DprA e: Calculated reduction in
,
applicable, the Sound insulation Performance tan be
A-weighted Sound Power or Sound pressure level ob-
obtained using inside the enclosure the artificial Sound
tained from D,, DP or Dpr, measured in accordance
Source described in annex A. These methods are
with this part of ISO 11546, and a specific noise
particularly useful when Sound insulation data are re-
spectrum. (See annex C.) lt is expressed in decibels.
quired for universally usable enclosures with sound-
absorbing interior surfaces and small leak ratios
3.13 weighted Sound pressure insulation
(preferably 8 < 2 %). The reciprocity method and the
(reciprocity method), Dpr w: Single-number value de-
artificial Sound Source method are applicable to en-
termined in accordance with the method stated in
closures with volumes less than 2 m3.
ISO 717-1 except that the Sound reduction index is
replaced by the Sound pressure insulation, reciprocity
NOTE 6
The more the enclosure deviates from these
method, Dpr. lt is expressed in decibels.
ideal conditions regarding the leak ratio and absorption, the
more there is a need to take measurements using the actual
3.14 weighted Sound power insulation, Dww:
Sound Source. The reciprocity method and the artificial
Single-number value determined in accordance w/th
Sound Source method are not applicable to close-fitting en-
closures (covers and cladding) where there is no free vol-
the method stated in ISO 717-1 except that the Sound
...