SIST EN ISO 11546-1:1997

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

Migrated from Progress Sheet (TC Comment) (2000-07-10): BTS4 by RES BTS4 C1/1992 approved new target dates as proposed by CEN/TC 211 ++ for the launching of the parallel voting procedure.

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

Diese Internationale Norm beschreibt Laborverfahren für die Bestimmung der Schalldämmung (Einfügungsdämm-Maß) kleiner Schallschutzkapseln für Maschinen. Die Norm gilt nur für eine vollständige Schallschutzkapsel und nicht für die einzelnen Wände, aus denen sie hergestellt wurde. Anmerkung: Die Schalldämmungen der Kapselteile, wie z.B. der Wandelemente, Türen, Fenster, Schalldämpfer usw. sollten nach anderen, diese betreffenden Normen gemessen werden.

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

L'IEC 62047-20:2014 spécifie les termes et définitions, les valeurs assignées et les caractéristiques, ainsi que les méthodes de mesure des gyroscopes. Les gyroscopes sont principalement utilisés dans des applications grand public, des applications industrielles générales et des applications aérospatiales. Les dispositifs microélectromécaniques (MEMS, Micro-Electrical-Mechanical Systems) et les lasers à semiconducteur sont largement utilisés dans la technologie des dispositifs de gyroscopes.

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

General Information

• Status: Withdrawn
• Publication Date: 31-Mar-1997
• Withdrawal Date: 27-Aug-2009
• ICS: 17.140.01 - Acoustic measurements and noise abatement in general
• Technical Committee: AKU - Acoustics
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 28-Aug-2009
• Due Date: 20-Sep-2009
• Completion Date: 28-Aug-2009
• 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: 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)

Relations

• Replaced By: 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)
• Effective Date: 01-Nov-2009

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 11546-1:1997
01-april-1997
$NXVWLND8JRWDYOMDQMH]YRþQRL]RODFLMVNLKODVWQRVWLRNURYRYGHO0HUMHQMHY
ODERUDWRULMVNLKUD]PHUDK,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 11546-1:1995
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
SIST EN ISO 11546-1:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11546-1:1997

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SIST EN ISO 11546-1:1997

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SIST EN ISO 11546-1:1997

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SIST EN ISO 11546-1:1997

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SIST EN ISO 11546-1:1997

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SIST EN ISO 11546-1:1997
INTERNATIONAL ISO
STANDARD
115464
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)

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SIST EN ISO 11546-1:1997
ISO 11546=1:1995(E)
Contents
Page
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Definitions
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Choice of measurement method
4
5 Instrumentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Test methods applicable to enclosures with the actual Sound
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Source
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.1 General
insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.2 Determination of Sound power
6.3 Determination of Sound pressure insulation at a specified
6
Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-.
7 Test methods applicable to enclosures without the actual Sound
6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Source
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1 General
6
7.2 Reciprocity method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
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
8
noise spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Uncertainty
. . . . . . . . . . . . . . . . .~. 8
9 Information to be recorded
8
.................. ............................................................
9.1 Test Object
. . . . . . . . . . . . . . . . . . . . . . . . . . .*. 8
9.2 Test conditions
........................................................... 9
9.3 I nstrumentation .
9
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

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SIST EN ISO 11546-1:1997
0 ISO ISO 1154601:1995(E)
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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
13
noise spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . .*.
D Bibliography

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SIST EN ISO 11546-1:1997
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.

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SIST EN ISO 11546-1:1997
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.

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SIST EN ISO 11546-1:1997
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)
2

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SIST EN ISO 11546-1:1997
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
3

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SIST EN ISO 11546-1:1997
0 ISO
ISO 11546~1:1995(E)
ume between the enclosure and the surface of the actual If the actual noise is known or tan be assumed, the
Sound Source.
reduction in A-weighted noise level due to the en-
closure tan be estimated according to the method
In cases where a Single-number value is wanted given in annex C.
based on measurements carried out with the
NOTE 7 Measurement data obtained using the actual
reciprocity method or the artificial Sound Source
Sound Source are not necessarily comparable with data ob-
method, the weighted Sound pressure insulation,
tained using the reciprocity method or an artificial Sound
D PrW, and the weighted Sound power insulation,
Source. In cases where the actual Sound Source is con-
D W’W, are the preferred quantities. (See definitions
nected to the enclosure, structure-borne Sound may influ-
3.1’3 and 3.14.) The weighted Sound insulation is a
ence the measurement result.
practicable Single-number value to be used for a rough
comparison of different enclosures. However, this
This part of ISO 11546 is intended for use together
quantity must not be taken as a general measure of
with a relevant International Standard for the deter-
the Sound insulation Performance of the enclosure,
mination of Sound power level or measurement of
as the Performance in actual situations strongly de-
Sound Dressure level. The applicability of the different
pends on the spectrum of the actual noise.
methods described is summarized intable 1.
Table 1 - Applicability of the different test methods
envwonmen
Reverberation room
Actual Sound Source
6.3
Outdoors or in large room ISO 112042)
Dpl ß,,A
Test room com- 7.1
Reciprocity Reverberation room plying with 7.2
n,P D,,r,w
ISO 3741 7.4
Reverberation room ISO 3741
Dw Dw,,
Artificial Sound Source
1) Notation according to clause 3.
2) Grade 3 methods (Survey) are not applicable when using this part of ISO 11546.

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SIST EN ISO 11546-1:1997
0 ISO ISO 11546=1:1995(E)
6.1.5 If practicable, choose the microphone pos-
5 lnstrumentation
itions to give the same environmental corrections
both with and without the enclosure. When measur-
The instrumentation System, including the micro-
ing with the enclosure, the test Object is defined to
phones and cables, shall meet the requirements for
be the machine with the enclosure. The microphone
a type 1 instrument as specified in IEC 651 or, in the
positions used for measurements on the enclosed
case of integrating-averaging Sound level meters, the
Source shall, if practicable, be the Same as those used
requirements for a type 1 instrument as specified in
for the unenclosed Source.
IEC 804.
NOTE 10 When measurements are carried out on en-
NOTE 8 Generally, an integrating-averaging Sound level
closures with high Sound insulation, care should be taken
meter is preferred.
to ensure that structure-borne sound/vibration in the floor
of the test room does not influence the measurement re-
For measurements in octave or one-third-octave
sult.
bands, the instrumentation System shall meet the re-
quirements for a type 1 filter as specified in IEC 1260.
Before and after each series of measurements, the
calibration of the entire measuring System shall be 6.2 Determination of Sound power
verified using an acoustical calibrator with an accuracy
insulation
of + 0,3 dB (type 1 in accordance with IEC 942).
-
One of the International Standards ISO 3741,
NOTE 9 An equivalent verification method which has
ISO 3742, ISO 3743-1, ISO 3743-2, ISO 3744,
been proved to be capable of checking the stability of the
ISO 9614-1 or ISO 9614-2 shall be Chosen depending
measurement System may be used.
on the test environment.
Determine the time-ave raged Sound power level dur-
6 Test methods applicable to enclosures
ing a typical operational cycle machine.
of the
with the actual Sound Source
Make the measurements with and without the en-
closure. The Sound power insulation in octave or
6.1 General
one-third-octave bands (D,) and A-weighted (DwA) are
given by:
6.1.1 When applying the actual Sound Source
D, = &(without enclosure) -
method, the maximum permissible volume of the en-
L,(with enclosure) . . .
closure is given by the relevant International Standard, (1)
selected from table 1.
D WA = &A(without enclosure) -
bA(with enclosure)
. . .
6.1.2 The operating conditions of the actual Sound (2)
Source shall be representative of normal use and shall
not Change between the measurements made with where
and without the enclosure. If a special test code ex-
is the Sound power level, in decibels, in
LW
ists for the actual Sound Source, the operating con-
octave or one-third-octave
bands
ditions specified in such a test code shall be used.
measured in accordance with the relevant
International Standard;
6.1.3 If the enclosure includes active elements (e.g.
fans), these elements shall be in Operation during the is the A-weighted Sound power level, in
hVA
measurements. If the active elements are not in- decibels, measured or calculated in ac-
tended for continuous Operation, measurement shall cordante with the relevant International
be carried out both with the active elements switched Standard.
on and switched off.
The frequency range shall at least cover the range
100 Hz to 5 000 Hz for one-third-octave bands and
6.1.4 When measuring in a reverberation room,
125 Hz to 4 000 Hz for octave bands.
place the enclosure in such a way that no enclosure
wall is parallel to any wall of the room. The minimum
NOTE 11 Frequency ranges of 50 Hz to
10 000 Hz for
distance from the enclosure to any wall shall be
one-third-octave bands and 63 Hz to 8 000 Hz for octave
1,b m. bands are preferred.

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SIST EN ISO 11546-1:1997
@c3 ISO
ISO ‘ll546-1: 1995(E)
The A-weighted levels are calculated from the band Use the frequency range as given in 6.2. According to
levels when ISO 11201 and ISO 11204, A-weighted values tan be
pressure ISO 3741, ISO 3742,
measured directly or calculated from frequency band
ISO 3743-1, ISO 9614-1 and ISO 9614-2 are used.
According to ISO 3743-2, the A-weighted levels tan data.
be measured directly. According to ISO 3744, the A-
NOTE 13 In Order to ensure consistency between fre-
weighted levels tan be measured or calculated from
quency band data and the A-weighted value, use of the
frequency band data.
calculated A-weighted value is preferred.
NOTE 12 In Order to ensure consistency between fre-
quency band data and the A-weighted value, use of the
7 Test methods applicable to enclosures
calculated A-weighted value is preferred.
without the actual Sound Source
Provided that the test environments and microphone
7.1 General
positions are identical for measurements with and
without the enclosure, the Sound power level differ-
If the actual Sound Source method cannot be used,
ence is equal to the Sound pressure level differente
the reciprocity method is the preferred one. In cases
averaged according to the Chosen International Stan-
where neither the actual Sound Source method nor
dard. This means that under identical test conditions
the reciprocity method is applicable, use an artificial
(i.e. identical environmental corrections) it is not
Sound Source as described in annex A.
necessary to convert the measured Sound pressure
levels into Sound power levels before calculating the
The reciprocity method and the artificial Sound Source
differente in levels. If the measurements with and
method are applicable to enclosures with volumes of
without the enclosure cannot be carried out within a
less than 2 m3. The methods are especially intended
very short period of time under fully controlled and
for universally applicable enclosures, i.e. enclosures
identical test conditions, the Sound power levels shall
not designed for one type of Source only.
be determined.
If the enclosure includes active elements (e.g. fans),
neither the artificial Sound Source method nor the
reciprocity method tan be used.
6.3 Determination of Sound pressure
insulation at a specified Position
NOTE 14 Enclosures with a small leak ratio (0 < 2 %) and
with sound-absorbing interior surfaces are particularly suit-
able for measurements with the reciprocity method or the
Make the measurements as specified in ISO 11201
artificial Sound Source method.
or ISO 11204. Determine the time-averaged Sound
pressure level during a typical operational cycle of the
machine.
7.2 Reciprocity method
The Sound pressure insulation in octave or one-third-
The test environment shall comply with the require-
octave bands (DJ and A-weighted (DPA) are given by:
ments for reverberation rooms given in ISO 3741. A
reverberant Sound field is generated in the room and
DP = L,(without enclosure) -
the Sound pressure level differente between the
room and the inside of the enclosure is determined.
L,(with enclosure) . . .
(3)
Place the enclosure asymmetrically on the floor in
D pA = $,A(without enclosure) -
such a way that no enclosure wall is parallel to any
wall of the test room. For measurements in the fre-
L,,(with enclosure) . . .
(4)
quency range 100 Hz to 10 000 Hz, the distance be-
tween the enclosure and the Walls and ceiling of the
where
room shall be at least one-half of the wavelength
is the Sound pressure level, in decibels, in corresponding to the centre frequency of the lowest
LP
octave or one-third-octave bands at a frequency band of interest. Furthermore, the distance
specified Position measured in accordance
between the enclosure and any diffusing elements in
with the relevant International Standard;
the room shall be at least one-half of a wavelength.
For measurements in the frequency range 50 Hz to
L is the A-weighted Sound pressure level, in
80 Hz, the distance shall be at least 2 m.
PA
decibels, at a specified Positio
...