EN ISO 11546-1:1995

SLOVENSKI STANDARD
01-april-1997
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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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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
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.

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 measuremen
...