SIST EN ISO 10140-5:2021

SLOVENSKI STANDARD
01-julij-2021
Nadomešča:
SIST EN ISO 10140-5:2010
SIST EN ISO 10140-5:2010/A1:2014
Akustika - Laboratorijsko merjenje zvočne izolirnosti gradbenih elementov - 5. del:
Zahteve za preskusne laboratorije in opremo (ISO 10140-5:2021)
Acoustics - Laboratory measurement of sound insulation of building elements - Part 5:
Requirements for test facilities and equipment (ISO 10140-5:2021)
Akustik - Messung der Schalldämmung von Bauteilen im Prüfstand - Teil 5:
Anforderungen an Prüfstände und Prüfeinrichtungen (ISO 10140-5:2021)
Acoustique - Mesurage en laboratoire de l'isolation acoustique des éléments de
construction - Partie 5: Exigences relatives aux installations et appareillage d'essai (ISO
10140-5:2021)
Ta slovenski standard je istoveten z: EN ISO 10140-5:2021
ICS:
17.140.01 Akustična merjenja in Acoustic measurements and
blaženje hrupa na splošno noise abatement in general
91.060.01 Stavbni elementi na splošno Elements of buildings in
general
91.120.20 Akustika v stavbah. Zvočna Acoustics in building. Sound
izolacija insulation
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 10140-5
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2021
EUROPÄISCHE NORM
ICS 91.120.20 Supersedes EN ISO 10140-5:2010
English Version
Acoustics - Laboratory measurement of sound insulation
of building elements - Part 5: Requirements for test
facilities and equipment (ISO 10140-5:2021)
Acoustique - Mesurage en laboratoire de l'isolation Akustik - Messung der Schalldämmung von Bauteilen
acoustique des éléments de construction - Partie 5: im Prüfstand - Teil 5: Anforderungen an Prüfstände
Exigences relatives aux installations et appareillage und Prüfeinrichtungen (ISO 10140-5:2021)
d'essai (ISO 10140-5:2021)
This European Standard was approved by CEN on 26 April 2021.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10140-5:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 10140-5:2021) has been prepared by Technical Committee ISO/TC 43
"Acoustics" in collaboration with Technical Committee CEN/TC 126 “Acoustic properties of building
elements and of buildings” the secretariat of which is held by AFNOR.
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 November 2021, and conflicting national standards
shall be withdrawn at the latest by November 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 10140-5:2010.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 10140-5:2021 has been approved by CEN as EN ISO 10140-5:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 10140-5
Second edition
2021-04
Acoustics — Laboratory measurement
of sound insulation of building
elements —
Part 5:
Requirements for test facilities and
equipment
Acoustique — Mesurage en laboratoire de l'isolation acoustique des
éléments de construction —
Partie 5: Exigences relatives aux installations et appareillage d'essai
Reference number
ISO 10140-5:2021(E)
©
ISO 2021
ISO 10140-5:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 10140-5:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Laboratory test facilities for airborne sound insulation measurements .2
4.1 General . 2
4.2 Test rooms . 2
4.2.1 Volume . 2
4.2.2 Diffusion . 2
4.2.3 Reverberation time . 2
4.2.4 Background noise . . 3
4.2.5 Suppression of flanking transmission . 3
4.3 Test opening . 3
4.3.1 General. 3
4.3.2 Full-sized test opening . 3
4.3.3 Reduced-size test opening . 5
4.3.4 Specific small-sized test opening . 6
5 Laboratory test facilities for impact sound insulation measurements .8
5.1 General . 8
5.2 Receiving room . 8
5.2.1 Volume . 8
5.2.2 Further requirements . 8
5.3 Test opening . 8
5.3.1 Full-sized test opening . 8
5.3.2 Frame specification . 8
6 Equipment . 9
6.1 Airborne sound field . 9
6.2 Impact sound source . 9
6.3 Measurement system. 9
Annex A (normative) Estimation of the maximum measurable sound reduction index .11
Annex B (normative) Standard basic elements for measuring the improvement of airborne
sound insulation by linings .15
Annex C (normative) Standard floors for measuring the improvement of impact sound
insulation by floor coverings .16
Annex D (normative) Qualification procedure for loudspeakers and loudspeaker positions .21
Annex E (normative) Standard tapping machine .25
Annex F (normative) Alternative impact sound sources .27
Annex G (normative) Wooden mock-up floor for measuring the improvement of impact
sound insulation by floor coverings .32
Annex H (normative) Specification of heavy and intense rain — Example of a tank with
perforated base .33
Annex I (informative) Reference test specimens for rainfall sound measurements .37
Bibliography .39
ISO 10140-5:2021(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. 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.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2,
Building acoustics, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 126, Acoustic properties of building elements and of buildings, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 10140-5:2010), which has been technically
revised. It also incorporates the Amendment ISO 10140-5:2010/Amd1: 2014.
The main changes compared to the previous edition are as follows:
— all references in the text have been updated;
— in Clause 2, the normative references have been updated;
— in Clause 3, the terms and definitions have been added;
— Annex B, Annex C and Annex H have been updated.
A list of all parts in the ISO 10140 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved

ISO 10140-5:2021(E)
Introduction
ISO 10140 (all parts) concerns laboratory measurement of the sound insulation of building elements
(see Table 1).
ISO 10140-1 specifies the application rules for specific elements and products, including specific
requirements for the preparation and mounting of the test specimens, and for the operating and test
conditions. ISO 10140-2 and ISO 10140-3 contain the general procedures for airborne and impact sound
insulation measurements, respectively, and refer to ISO 10140-4 and this document where appropriate.
For elements and products without a specific application rule described in ISO 10140-1, it is possible
to apply ISO 10140-2 and ISO 10140-3. ISO 10140-4 contains basic measurement techniques and
processes. This document contains requirements for test facilities and equipment. For the structure of
ISO 10140 (all parts), see Table 1.
ISO 10140 (all parts) was developed to improve the layout for laboratory measurements, ensure
consistency and simplify future changes and additions regarding mounting conditions of test elements
in laboratory and field measurements. ISO 10140 (all parts) aims at presenting a well-written and
arranged format for laboratory measurements.
ISO 10140-1 is planned to be updated with application rules for other products.
Table 1 — Structure and contents of ISO 10140 (all parts)
Relevant Main purpose, contents and use Detailed content
part of
ISO 10140
ISO 10140-1 It indicates the appropriate test procedure Appropriate references to ISO 10140-2 and
for elements and products. For certain types ISO 10140-3 and product-related, specific and
of element/product, it can contain addi- additional instructions on:
tional and more specific instructions about
— specific quantities measured;
quantities and test element size and about
— size of test element;
preparation, mounting and operating condi-
tions. Where no specific details are includ-
— boundary and mounting conditions;
ed, the general guidelines are according to
ISO 10140-2 and ISO 10140-3. — conditioning, testing and operating conditions;
— additional specifics for test report.
ISO 10140-2 It gives a procedure for airborne sound insu- — Definitions of main quantities measured
lation measurements according to ISO 10140-
— General mounting and boundary conditions
4 and ISO 10140-5. For products without
specific application rules, it is sufficiently
— General measurement procedure
complete and general for the execution of
— Data processing
measurements. However, for products with
specific application rules, measurements
— Test report (general points)
are carried out according to ISO 10140-1, if
available.
ISO 10140-3 It gives a procedure for impact sound insula- — Definitions of main quantities measured
tion measurements according to ISO 10140-
— General mounting and boundary conditions
4 and ISO 10140-5. For products without
specific application rules, it is sufficiently — General measurement procedure
complete and general for the execution of
— Data processing
measurements. However, for products with
specific application rules, measurements — Test report (general points)
are carried out according to ISO 10140-1, if
available.
ISO 10140-5:2021(E)
Table 1 (continued)
Relevant Main purpose, contents and use Detailed content
part of
ISO 10140
ISO 10140-4 It gives all the basic measurement techniques — Definitions
and processes for measurement according
— Frequency range
to ISO 10140-2 and ISO 10140-3 or facility
qualifications according to ISO 10140-5. Much
— Microphone positions
of the content is implemented in software.
— SPL measurements
— Averaging, space and time
— Correction for background noise
— Reverberation time measurements
— Loss factor measurements
— Low-frequency measurements
— Radiated sound power by velocity measurement
ISO 10140-5 It specifies all information needed to design, Test facilities, design criteria:
construct and qualify the laboratory facility,
— volumes, dimensions;
its additional accessories and measurement
— flanking transmission;
equipment (hardware).
— laboratory loss factor;
— maximum achievable sound reduction index;
— reverberation time;
— influence of lack of diffusivity in the laboratory.
Test openings:
— standard openings for walls and floors;
— other openings (windows, doors, small tech-
nical elements);
— filler walls in general.
Requirements for equipment:
— loudspeakers, number, positions;
— tapping machine and other impact sources;
— measurement equipment.
Reference constructions:
— basic elements for airborne and impact insu-
lation improvement;
— corresponding reference performance curves.
vi © ISO 2021 – All rights reserved

INTERNATIONAL STANDARD ISO 10140-5:2021(E)
Acoustics — Laboratory measurement of sound insulation
of building elements —
Part 5:
Requirements for test facilities and equipment
1 Scope
This document specifies laboratory test facilities and equipment for sound insulation measurements of
building elements, such as:
— components and materials;
— building elements;
— technical elements (small building elements);
— sound insulation improvement systems.
It is applicable to laboratory test facilities with suppressed radiation from flanking elements and
structural isolation between source and receiving rooms.
This document specifies qualification procedures for use when commissioning a new test facility
with equipment for sound insulation measurements. It is intended that these procedures be repeated
periodically to ensure that there are no issues with the equipment and the test facility.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3382-2, Acoustics — Measurement of room acoustic parameters — Part 2: Reverberation time in
ordinary rooms
ISO 9052-1:1989, Acoustics — Determination of dynamic stiffness — Part 1: Materials used under floating
floors in dwellings
ISO 10140-1, Acoustics — Laboratory measurement of sound insulation of building elements — Part 1:
Application rules for specific products
ISO 10140-2, Acoustics — Laboratory measurement of sound insulation of building elements — Part 2:
Measurement of airborne sound insulation
ISO 10140-3, Acoustics — Laboratory measurement of sound insulation of building elements — Part 3:
Measurement of impact sound insulation
ISO 10140-4, Acoustics — Laboratory measurement of sound insulation of building elements — Part 4:
Measurement procedures and requirements
IEC 60942:2017, Electroacoustics — Sound calibrators
IEC 61260-1, Electroacoustics — Octave-band and fractional-octave-band filters — Part 1: Specifications
IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications
ISO 10140-5:2021(E)
IEC 61672-2, Electroacoustics — Sound level meters — Part 2: Pattern evaluation tests
IEC 61672-3, Electroacoustics — Sound level meters — Part 3: Periodic tests
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Laboratory test facilities for airborne sound insulation measurements
4.1 General
The laboratory test facility shall consist of two adjacent reverberant rooms with a test opening between
them, in which the test element is inserted.
The area of the test opening can vary depending on the type of test element. This document defines
full-sized test openings, a specific small-sized test opening and alternative reduced-size test openings.
For measurement of the improvement of sound reduction index by acoustical linings, these rooms shall
be separated by a standard basic element on which the lining under test is installed, in accordance with
Annex B.
4.2 Test rooms
4.2.1 Volume
The volumes of the test rooms shall be at least 50 m . Volumes and corresponding dimensions of the
two test rooms should not be exactly the same. A difference of at least 10 % in room volumes and in the
linear dimensions is recommended.
Choose the ratios of the room dimensions such that the eigenmode frequencies in the low-frequency
bands are spaced as uniformly as possible.
When measuring the sound insulation of walls or floors, theoretical calculation as well as experiments
have indicated that the test element should cover a total partition wall or ceiling of the test room, i.e.
the test opening should extend from wall to wall and from floor to ceiling. In such a case, a volume of
3 3
50 m to 60 m is appropriate in view of the recommended size of the test opening.
4.2.2 Diffusion
Large variations of the sound pressure level in the room indicate the presence of dominating strong
standing waves. In this case, diffusing elements shall be installed in the rooms. The positioning and
number of diffusing elements should be arranged in such a way that the sound reduction index is not
influenced when further diffusing elements are installed.
NOTE For some kinds of test element, as for elements with one surface significantly more absorbent than the
other (see ISO 10140-2), the installation of diffusing elements is mandatory.
4.2.3 Reverberation time
The reverberation time in the rooms under normal test conditions (with negligible absorption by the
test element) should not be excessively long or short. When the reverberation time at frequencies at
2 © ISO 2021 – All rights reserved

ISO 10140-5:2021(E)
and above 100 Hz exceeds 2 s or is less than 1 s, check whether the measured sound reduction index
depends on the reverberation time. When such a dependence is found, even with diffusers in the rooms,
the rooms shall be modified to adjust the reverberation time, T, such that:
23/
1≤≤TV25()/ 0 (1)
where
V is the value of the room volume, in cubic metres;
T is the reverberation time, in seconds.
Measurement of the reverberation time is specified in ISO 10140-4.
4.2.4 Background noise
The background noise level in the receiving room shall be sufficiently low to permit measurements of
the sound transmitted from the source room, considering the power output in the source room and the
sound insulation of the test elements for which the laboratory is intended (see ISO 10140-4:2021, 4.3).
4.2.5 Suppression of flanking transmission
In laboratory test facilities designed for measuring the sound reduction index, the sound transmitted
by any indirect path should be negligible compared with the sound transmitted through the test
element. One approach to achieve this in such facilities is to provide sufficient structural isolation
between source and receiving rooms. Another approach is to cover all surfaces of both rooms with
linings that reduce the flanking transmission in such a way that the requirements on room volumes and
reverberation times are still met.
Annex A specifies the methods to be used for estimating the maximum achievable sound reduction
index, R´ , which is determined by indirect paths.
max
4.3 Test opening
4.3.1 General
A horizontal and a vertical full-sized test opening, as well as a specific vertical small-sized test opening
are defined. Other reduced-size test openings may be applied under certain restrictions.
4.3.2 Full-sized test opening
4.3.2.1 General
2 2
The area of the full-sized test opening shall be approximately 10 m for walls, and between 10 m and
20 m for floors, with the length of the shorter edge being not less than 2,3 m for both walls and floors.
4.3.2.2 General frame specification
The measured sound reduction index of a test element can be affected by the connections to the
laboratory structure surrounding the element. The mass ratio of the tested structure to the surrounding
structure should be taken into consideration. For tests on lightweight structures (m < 150 kg/m ),
ISO 10140-5:2021(E)
there are no special requirements to be taken into account. For heavier structures under test, it should
be ensured that the loss factor, η, of the test element is not less than that given by Formula (2):
03,
η =+00, 1 (2)
min
f
where f is the test frequency value, in hertz.
To check this requirement, use as the test element a brick or block wall having a mass of (400 ± 40) kg/
m plastered on one side. Measurement of the loss factor is specified in ISO 10140-4.
4.3.2.3 Specific requirements on the frame for lightweight double-leaf partitions
With lightweight double-leaf partitions, the sound reduction index is affected by vibration transmission
between the wall leaves via the frame of the test opening (see Figure 1). This is influenced by the
mounting conditions in the laboratory test opening and by the material properties and dimensions of
the frame(s). Vibration transmission between the coupled structures of the partition itself (e.g. common
or coupled studs) is dependent on the specific construction of the partition and is a property of the test
element itself. This vibration transmission is not treated in this document.
In order to improve the reproducibility of the sound reduction index between laboratories for walls,
guidance is given for the mass per unit area of the frame of the test opening. If there is an acoustic break
in the laboratory test opening, the frame on one side of that break should be considered. The mass per
unit area of the frame shall be much larger than the mass per unit area of the heaviest leaf of the double
partition. The ratio of the mass per unit area of the heaviest leaf of the double partition to that of the
frame of the test opening shall be at least 1:6. The minimum thickness of the frame should be 100 mm
and the minimum depth should be 200 mm. The frame shall have a density of at least 2 000 kg/m .
The cross-sectional surface mass shall be more than 450 kg/m . In addition, the frame(s) shall consist
of a homogeneous, massive construction, such as dense concrete or masonry. Wood or metal frames
connecting the two leaves shall not be used.
The surface mass per unit area is calculated from the density, ρ, and the thickness, t, of the elements, as
shown in Figure 2, using Formulae (3) and (4):
′
mt=ρ (3)
LL L
where
m′ is the mass per unit area of the test facility wall, in kilograms per square metre;
L
ρ is the density of the test facility wall, in kilograms per cubic metre;
L
t is the thickness of the test facility wall, in metres.
L
mt′ =ρ (4)
ee e
where
m′
is the mass per unit area of the element, in kilograms per square metre;
e
ρ is the density of the element, in kilograms per cubic metre;
e
t is the thickness of the element, in metres.
e
4 © ISO 2021 – All rights reserved

ISO 10140-5:2021(E)
Key
1 frame of the test opening
Figure 1 — Vibration transmission across the border frame of the test opening
Key
1 test facility wall
2 element under test
t thickness of the test facility wall
˪
t thickness of the test element
e
Figure 2 — Determination of the mass per unit area of the elements
4.3.3 Reduced-size test opening
The test opening may have a reduced area:
a) if the test element area is smaller than the full-sized test opening;
b) if special acoustical conditions are met on the test element;
c) if the test element is a small technical element.
ISO 10140-5:2021(E)
Reduced-size test openings are specified in ISO 10140-1 and ISO 10140-2.
4.3.4 Specific small-sized test opening
Specific small-sized test openings are 1 250 mm in width and 1 500 mm in height, with an allowable
tolerance on each dimension of ±50 mm, preferably maintaining the same aspect ratio. The test opening
has a maximum depth of 500 mm, with staggered niches with a reflective finish. The larger niche is
60 mm to 65 mm wider at the sides and the top only.
The wall with the test opening is constructed from two walls of about equal thickness made of concrete,
plastered bricks or similar material with a density of at least 1 800 kg/m . The gap between the two
walls is filled with mineral wool and shall be covered with an airtight reflecting resilient material. Care
should be taken to ensure that the resilient material does not add flanking transmission by coupling the
two walls. This wall may be a filler wall in the full-sized test opening.
A vertical and a horizontal section are shown in Figure 3 with a detail of the gap as an example of the
test opening within the specifications given. The dimensions of the niches in the horizontal section
shall be the same as in the vertical section.
The minimum distance between the small-sized test opening and any wall, floor or ceiling of either
room shall be 500 mm. The opening should not be symmetrical in the separating wall.
6 © ISO 2021 – All rights reserved

ISO 10140-5:2021(E)
Dimensions in millimetres
Key
1 mineral wool
2 resilient material (acoustically reflective)
3 double partition wall
4 reflective finishing
Figure 3 — Example of the construction of the specific small-sized test opening
ISO 10140-5:2021(E)
5 Laboratory test facilities for impact sound insulation measurements
5.1 General
The laboratory test facility consists of two vertically adjacent rooms, the upper one being designated
the “source room” and the lower one, the “receiving room”. There are no specific requirements for the
shape and size of the source room for impact sound measurements.
For measurements of the reduction of transmitted impact sound by floor coverings, these rooms shall
be separated by a standard test floor on which the floor covering under test is installed in accordance
with Annex C.
For these and other measurements, reference objects can also be defined to calibrate the test facility;
see Annex I for the measurement of rainfall sound as an example.
5.2 Receiving room
5.2.1 Volume
The volume of the receiving room shall be not less than 50 m . The ratio of the receiving room
dimensions shall be chosen so that the eigenmode frequencies in the low-frequency bands are spaced as
uniformly as possible.
Theoretical calculations as well as experiments have indicated that it may be advisable that the test
element cover the total ceiling area of the receiving room, i.e. the test opening should extend from wall
3 3
to wall. In such a case, a volume of 50 m to 60 m is appropriate in view of the recommended size of the
test opening.
5.2.2 Further requirements
The room shall fulfil the same requirements as the rooms for airborne sound insulation specified in
4.2.2, 4.2.3, 4.2.4 and 4.2.5.
In addition, the airborne sound insulation between the receiving room and the space with the tapping
machine shall be sufficiently high that the sound field measured in the receiving room is only that
generated by impact excitation of the floor under test.
5.3 Test opening
5.3.1 Full-sized test opening
2 2
The size of the test opening for floors shall be between 10 m and 20 m , with the shorter edge length
not less than 2,3 m.
5.3.2 Frame specification
The measured impact sound insulation of a test element can be affected by the connections to the
laboratory structure surrounding the element. The mass ratio of the tested structure to the surrounding
structure should be taken into consideration. For tests on lightweight structures (m < 150 kg/m ),
there are no special related requirements to be taken into account. For heavier structures under test, it
should be ensured that the loss factor, η, of the test element is not less than
03,
η =+00, 1 (5)
min
f
where f is the value of test frequency, in hertz.
8 © ISO 2021 – All rights reserved

ISO 10140-5:2021(E)
To check this requirement, use a concrete floor having a mass of (300 ± 30) kg/m as the test element.
For measurement of the loss factor, see ISO 10140-4.
6 Equipment
6.1 Airborne sound field
The sound field in the rooms depends on the type and position of the sound source. The sound source
should be positioned and operated to try and achieve a diffuse sound field. The positions and directivity
of the source shall permit microphone positions to be used outside the direct field of the source and
shall ensure that the direct radiation from the source is not dominant on the surface of the test element.
This shall be achieved using a sound source at fixed positions or along a moving path that complies with
the requirements in Annex D. Sound sources may be used at fixed positions simultaneously, provided
they are of the same type and are driven at the same level by similar, but uncorrelated, signals.
The sound generated in the source room shall be steady and have a continuous spectrum in the
frequency range considered. If filtering of the source signal is used, use a bandwidth of at least one-
third octave. If broadband noise is used (white noise is recommended), the spectrum may be shaped to
ensure an adequate signal-to-noise ratio at high frequencies in the receiving room. In either case, the
average sound spectrum in the source room, at least above 100 Hz, shall not have a difference in level
of more than 6 dB between adjacent one-third octave bands. Sound field specifications are given in
ISO 10140-4 and ISO 18233 gives equivalent alternatives.
The source room should be the larger room.
When measuring the airborne sound insulation of a floor in a vertical transmission test facility with the
source(s) in the upper room, the base of each source shall be at least 1,5 m above the floor.
6.2 Impact sound source
The impact sound source that shall be used is the standard tapping machine as specified in Annex E.
Annex F specifies two alternative impact sources that shall be used alternatively, as explained in
ISO 10140-3:2021, Clause 1.
Annex H specifies an artificial rain source that shall be used to characterize the generation of rainfall
sound on building elements, as explained in ISO 10140-1:2021, Annex K.
6.3 Measurement system
The instrumentation system, including the microphones and cables, shall meet the requirements of a
1)
Class 1 instrument in accordance with IEC 61672-1 and the filters shall meet the requirements for a
Class 0 or 1 instrument in accordance with IEC 61260-1. A sound calibrator shall meet the requirements
of Class 1 in accordance with IEC 60942.
The reverberation time measurement equipment shall comply with the requirements defined in
ISO 3382-2.
Conformity of the instrumentation system with the requirements of IEC 61672-1, conformity of the
sound calibration device with the requirements of IEC 60942:2017, Annex A, and conformity of the
1)  Previously called Type 1 in accordance with IEC 60651 and IEC 60804, which have been withdrawn and
replaced with IEC 61672-1 and IEC 61672-2.
ISO 10140-5:2021(E)
filters with IEC 61260-1 shall be verified by the existence of a valid pattern evaluation certificate issued
by a competent laboratory.
2)
NOTE In those cases where instruments are in conformance with withdrawn standards , the competent
national laboratory can issue pattern evaluation certification according to procedures given in OIML R 58 and
OIML R 88.
Test procedures for pattern evaluation are given in IEC 61672-2 and test procedures for periodic testing
in IEC 61672-3. The user shall ensure that conformity with these International Standards is verified
periodically.
2)  That is, IEC 60651 and IEC 60804, which have been withdrawn and replaced with IEC 61672-1 and IEC 61672-2.
10 © ISO 2021 – All rights reserved

ISO 10140-5:2021(E)
Annex A
(normative)
Estimation of the maximum measurable sound reduction index
A.1 General
Figure A.1 shows a schematic representation of the different transmission paths between the rooms in
a test facility. The direct path is Dd, whereas Fd, Ff and Df are flanking paths.
Key
1 source room
2 receiving room
Figure A.1 — Transmission paths in a test facility
The sound power transmitted into the receiving room can be assumed to consist of the sum of the
following components:
W which has entered the partition directly and is radiated from it directly;
Dd
W which has entered the partition directly, but is radiated from flanking constructions;
Df
W which has entered flanking constructions and is radiated from the partition directly;
Fd
W which has entered flanking constructions and is radiated from flanking constructions;
Ff
W which has been transmitted (as airborne sound) through leaks, ventilation ducts, etc.
leak
The flanking transmission may be investigated using one of the following two ways.
a) By covering the test element on both sides with additional flexible layers, for example 13 mm
gypsum board on a separate frame at a distance which gives a resonance frequency of the system
of layer and airspace well below the frequency range of interest. The airspace should contain
sound-absorbing material. With this measurement W , W and W are suppressed, and the
Dd Df Fd
measured apparent sound reduction index is determined by W (W is assumed to be negligible
Ff leak
under laboratory conditions). Additional flexible layers, covering particular flanking surfaces, may
permit identification of the major flanking paths;
b) By estimating the radiated sound power from flanking constructions in the receiving room using
measurement of the average surface velocity levels or average sound intensity radiated by the
surfaces (see ISO 10140-4).
ISO 10140-5:2021(E)
If the power radiated from the flanking constructions, W + W , is determined in this way, the
Df Ff
measurement
...