EN ISO 10052:2021

SLOVENSKI STANDARD
01-september-2021
Nadomešča:
SIST EN ISO 10052:2005
SIST EN ISO 10052:2005/A1:2010
Akustika - Terenska merjenja izolirnosti pred zvokom v zraku in udarnim zvokom -
Informativna metoda (ISO 10052:2021)
Acoustics - Field measurements of airborne and impact sound insulation and of service
equipment sound - Survey method (ISO 10052:2021)
Akustik - Messung der Luftschalldämmung und Trittschalldämmung und des Schalls von
haustechnischen Anlagen in Gebäuden - Kurzverfahren (ISO 10052:2021)
Acoustique - Mesurages in situ de l'isolement aux bruits aériens et de la transmission
des bruits de choc ainsi que du bruit des équipements - Méthode de contrôle (ISO
10052:2021)
Ta slovenski standard je istoveten z: EN ISO 10052:2021
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
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 10052
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2021
EUROPÄISCHE NORM
ICS 17.140.20; 91.120.20; 91.140.01 Supersedes EN ISO 10052:2004, EN ISO
10052:2004/A1:2010
English Version
Acoustics - Field measurements of airborne and impact
sound insulation and of service equipment sound - Survey
method (ISO 10052:2021)
Acoustique - Mesurages in situ de l'isolement aux Akustik - Messung der Luftschalldämmung und
bruits aériens et de la transmission des bruits de choc Trittschalldämmung und des Schalls von
ainsi que du bruit des équipements - Méthode de haustechnischen Anlagen in Gebäuden - Kurzverfahren
contrôle (ISO 10052:2021) (ISO 10052:2021)
This European Standard was approved by CEN on 5 July 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 10052:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 10052:2021) 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 January 2022, and conflicting national standards shall
be withdrawn at the latest by January 2022.
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 10052:2004.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN websites.
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 10052:2021 has been approved by CEN as EN ISO 10052:2021 without any modification.

INTERNATIONAL ISO
STANDARD 10052
Second edition
2021-07
Acoustics — Field measurements of
airborne and impact sound insulation
and of service equipment sound —
Survey method
Acoustique — Mesurages in situ de l’isolement aux bruits aériens et de
la transmission des bruits de choc ainsi que du bruit des équipements
— Méthode de contrôle
Reference number
ISO 10052:2021(E)
©
ISO 2021
ISO 10052:2021(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 10052:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Single number quantities . 7
5 Instrumentation . 8
6 Test procedure and evaluation . 8
6.1 General . 8
6.2 Generation of sound field . 8
6.2.1 General. 8
6.2.2 Airborne sound insulation between rooms . 9
6.2.3 Impact sound insulation between rooms . 9
6.2.4 Airborne sound insulation of façades . 9
6.3 Measurement of sound pressure levels .10
6.3.1 Airborne and impact sound insulation between rooms .10
6.3.2 Heavy/soft impact sound insulation between rooms .11
6.3.3 Airborne sound insulation of façades .11
6.3.4 Service equipment sound pressure level .12
6.4 Frequency range of measurements .12
6.5 Reverberation index data .12
6.6 Precision .16
7 Expression of results .16
7.1 Airborne sound insulation .16
7.2 Impact sound insulation .16
7.3 Service equipment sound pressure level .16
8 Test report .17
Annex A (informative) Forms for the expression of results.19
Annex B (normative) Operating conditions and operating cycles for measuring
the maximum sound pressure level and the equivalent continuous sound pressure level 26
Bibliography .33
ISO 10052:2021(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 products 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 10052:2004), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— implementation of ISO 10052:2004/Amd 1:2010;
— references have been updated;
— added to the scope: for heavy/soft impact sound insulation, the results are given as A-weighted
maximum levels;
— 2 terms added: maximum impact sound pressure level L and A-weighted maximum impact
i,Fmax
sound pressure level L ;
iA,Fmax
— including heavy/soft impact sound test procedure and impact sound pressure level evaluation
procedure;
— editorial updating.
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 10052:2021(E)
Introduction
This document describes survey field test methods which can be used for surveying the acoustic
characteristics of the airborne sound insulation, impact sound insulation and of the sound pressure
levels from service equipment. The methods may be used for screening tests of the acoustical properties
of buildings. The methods are not intended to be applied for measuring acoustical properties of building
elements.
The approach of the survey methods is to simplify the measurement of sound pressure levels in rooms
by using a hand-held sound level instrument and by manually sweeping the microphone in the room
space. The correction for reverberation time can be either estimated by usage of tabular values or be
based on measurements. The measurement of airborne and impact sound insulation is carried out in
octave bands. For measuring sound from domestic service equipment, A - or C -weighted sound pressure
levels are recorded.
Measurements are performed with specified operation conditions and operation cycles. The operating
conditions and operating cycles given in Annex B are only used if they are not opposed to national
requirements and regulations.
The measurement uncertainty of the results obtained using the survey method is a priori larger than
the uncertainty inherent in the corresponding test methods on engineering level.
NOTE Engineering methods for field measurements of airborne and impact sound insulation are dealt with
in ISO 16283-1 and ISO 16283-2. Engineering methods for field measurements of airborne sound insulation of
façade elements and façades are dealt with in ISO 16283-3. An engineering method for measurement of service
equipment sound is dealt with in ISO 16032.
INTERNATIONAL STANDARD ISO 10052:2021(E)
Acoustics — Field measurements of airborne and impact
sound insulation and of service equipment sound —
Survey method
1 Scope
This document specifies field survey methods for measuring
a) airborne sound insulation between rooms,
b) impact sound insulation of floors,
c) airborne sound insulation of façades, and
d) sound pressure levels in rooms caused by service equipment.
The methods described in this document are applicable for measurements in rooms of dwellings or in
rooms of comparable size with a maximum of 150 m .
For airborne sound insulation, impact sound insulation and façade sound insulation the method gives
values which are (octave band) frequency dependent. They can be converted into a single number
characterising the acoustical performances by application of ISO 717-1 and ISO 717-2. For heavy/soft
impact sound insulation, the results also are given as A-weighted maximum impact sound pressure
level. For service equipment sound the results are given directly in A - or C -weighted sound pressure
levels.
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 10140-5:2021, Acoustics — Laboratory measurement of sound insulation of building elements —
Part 5: Requirements for test facilities and equipment
ISO 16283-2:2020, Acoustics — Field measurement of sound insulation in buildings and of building
elements — Part 2: Impact sound insulation
IEC 61260, Electroacoustics — Octave-band and fractional-octave-band filters
IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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/
ISO 10052:2021(E)
3.1
average sound pressure level
L
ten times the logarithm to the base 10 of the ratio of the space and time average of the
sound pressure squared to the square of the reference sound pressure, the space average being taken
over the entire room with the exception of those parts where the direct radiation of a sound source or
the near field of the boundaries (wall, etc.) is of significant influence
Note 1 to entry: It is expressed in decibels as:
T
m
dpt() t
∫
T
m
L = 10 lg dB
p
where
p is the sound pressure level, in Pascal, p = 20 µPa is the reference sound pressure;
T is the integration time, in seconds.
m
3.2
level difference
D
difference in the space and time average sound pressure levels produced in two rooms by one sound
source in one of them
Note 1 to entry: It is expressed in decibels as:
DL=−L
where
L is the average sound pressure level in the source room, in decibels;
L
is the average sound pressure level in the receiving room, in decibels.
3.3
reverberation index
k
ten times the logarithm to the base 10 of the ratio of the actual reverberation time, T, of the receiving
room to the reference reverberation time, T
Note 1 to entry: It is expressed in decibels.
Note 2 to entry: This quantity is denoted by:
T
k=10lg dB
T
where T = 0,5 s.
3.4
standardized level difference
D
nT
level difference (3.2) corresponding to a reference value of the reverberation time in the receiving room
Note 1 to entry: It is expressed in decibels as:
D = D + k
nT
2 © ISO 2021 – All rights reserved

ISO 10052:2021(E)
where
D is the level difference (3.2), in decibels;
k is the reverberation index (3.3), in decibels.
3.5
normalized level difference
D
n
level difference, D, (3.2) corresponding to the reference absorption area in the receiving room
Note 1 to entry: It is expressed in decibels as:
AT
DD=+k+ 10 lg dB
n
01,V6
where
k is the reverberation index;
T is the reference reverberation time (T = 0,5 s);
0 0
V is the volume of the receiving room, in cubic metres;
A is the reference equivalent absorption area, in square metres, (A = 10 m );
0 0
0,16 has the unit s/m.
3.6
apparent sound reduction index
R’
ten times the logarithm to the base 10 of the ratio of the sound power W which is incident on a partition
under test to the total sound power transmitted into the receiving room, if, in addition to the sound
power W transmitted through the separating element, the sound power W , transmitted through
2 3
flanking elements or by other components, is significant
Note 1 to entry: It is expressed in decibels as:
W
'
R =10lg dB
WW+
Note 2 to entry: The expression "apparent sound transmission loss" is also in use in English-speaking countries.
It is equivalent to "apparent sound reduction index".
Under the assumption of diffuse sound fields in the two rooms, the apparent sound reduction index in this
document is calculated from:
ST
'
RD=+k+10lg dB
01, 6V
where
D is the sound pressure level difference, in decibels;
k is the reverberation index;
S is the area of the partition, in square metres;
ISO 10052:2021(E)
V is the volume of the receiving room, in cubic metres;
T is the reference reverberation time (T = 0,5 s);
0 0
0,16 has the unit s/m.
In the case of staggered or stepped rooms, S is that part of the area of the partition common to both rooms. If
the common area between the stepped or staggered rooms is less than 10 m , this shall be indicated in the test
report. If V/7,5 is larger than S, insert this value for S where V is the volume in m of the receiving room which
should be the smaller room.
In the case that no common area exists the normalized level difference D shall be determined.
n
Note 3 to entry: In the apparent sound reduction index, the sound power transmitted into the receiving room is
related to the sound power incident on the common partition irrespective of actual conditions of transmission.
The apparent sound reduction index is independent of the measuring direction between the rooms if the sound
fields are diffuse in both rooms.
3.7
impact sound pressure level
L
i
average sound pressure level (3.1) in the receiving room when the floor under test is excited by the
standardized tapping machine
Note 1 to entry: It is expressed in decibels.
Note 2 to entry: If more than one position of the tapping machine is used, the impact sound pressure level is
calculated by averaging the sound pressure levels L at N positions according to:
i,n
N
 
L /10
i,n
L = 10 lg 10  dB
∑
i
 
N
 n = 1 
3.8
standardized impact sound pressure level
L’
nT
impact sound pressure level L , (3.7), reduced by the reverberation index, k, (3.3) and expressed in
i
decibels:
L’ = L − k
nT i
3.9
normalized impact sound pressure level
L’
n
impact sound pressure level L , (3.7),reduced by a correction term which is given in decibels, being ten
i
times the logarithm to the base 10 of the ratio between the reference equivalent absorption area and
the actual equivalent sound absorption area A of the receiving room
Note 1 to entry: The actual equivalent absorption area is calculated from the reverberation index, the reference
reverberation time and the room volume:
A AT
00 0
'
LL=−10lg dB =−Lk−10lg dB
ni i
A 01,V6
where
4 © ISO 2021 – All rights reserved

ISO 10052:2021(E)
V is the volume of the receiving room, in cubic metres;
k is the reverberation index;
T is the reference reverberation time (T = 0,5 s);
0 0
A is the reference absorption area (A = 10 m );
0 0
0,16 has the unit s/m.
3.10
heavy/soft impact source
standard impact sound source to measure heavy/soft impact sound in dwellings such as a child running
and jumping or an adult walking
Note 1 to entry: For more information see ISO 10140-5 and ISO 16283-2.
3.11
maximum impact sound pressure level
L
i,Fmax
impact sound pressure level measured by Fast time-weighting at receiving points when the heavy/soft
impact source (3.10) impacts the floor
Note 1 to entry: This quantity is expressed in decibels.
3.12
average sound pressure level
L
1,s
ten times the logarithm to the base 10 of the ratio of the surface and time average
of the sound pressure squared to the square of the reference sound pressure, the surface average being
taken over the entire test surface including reflecting effects from the test specimen and façade
Note 1 to entry: It is expressed in decibels.
3.13
façade level difference
D
2m
difference between the outdoor sound pressure level 2 m in front of the façade, L , and the space and
1;2m
time averaged sound pressure level, L , in the receiving room
Note 1 to entry: It is expressed in decibels as:
D = L – L
2m 1,2m 2
It is also possible to measure in the plane of the façade. In this case the denotation is L instead of L .
1,s 1,2m
If road traffic sound has been used as sound source the notation is D and if a loudspeaker has been used it is
tr,2m
D and is expressed in decibels.
ls,2m
3.14
standardized façade level difference
D
2m,nT
façade level difference, D , (3.13) corresponding to a reference value of the reverberation time in the
2m
receiving room.
Note 1 to entry: It is expressed in decibels as
D = D + k
2m,nT 2m
where k is the reverberation index.
ISO 10052:2021(E)
3.15
normalized façade level difference
D
2m,n
façade level difference D (3.13), corresponding to the reference equivalent absorption area in the
2m
receiving room
Note 1 to entry: It is calculated as follows:
AT
DD=+k+10lg dB
2m,n 2m
01, 6V
where
V is the volume of the receiving room, in cubic metres;
k is the reverberation index;
T is the reference reverberation time (T = 0,5 s);
0 0
A is the reference equivalent absorption area in square metres (A = 10 m );
0 0
0,16 has the unit s/m.
3.16
service equipment sound pressure level
average sound pressure level in the room obtained by the procedure described in 6.3.4 and calculated
as follows:
LLL//10 10 /10
 XY ,,,12XY XY 3 
10 ++10 10
L =10lg dB
 
XY
 
 
where
L is the weighted sound pressure level obtained by the measurement at position 1 close
XY,1
to the corner;
L , L are the weighted sound pressure levels obtained by the two measurements at position 2
XY,2 XY,3
in the reverberant field of the room;
X relates to the frequency weighting used (X can be A or C);
Y characterizes there the temporal weighting (Y can be F, S or equivalent continuous level,
L )
eq
Note 1 to entry: The different measures, L , are not comparable. Only measurement results obtained with the
XY
same measuring parameters can be compared.
3.17
standardized service equipment sound pressure level
sound pressure level corresponding to a reference of the reverberation time in the receiving room
Note 1 to entry: This quantity is denoted by L
XY,nT
L = L − k
XY,nT XY
where
L is the service equipment sound pressure level;
XY
k is the reverberation index;
6 © ISO 2021 – All rights reserved

ISO 10052:2021(E)
in this case, k is calculated from the arithmetic average of the reverberation times measured for the octave-
bands 500 Hz, 1 kHz and 2 kHz.
k = 10lg 1/3 [(T + T + T )/T ] dB
500 1 000 2 000 0
3.18
normalized service equipment sound pressure level
service equipment sound pressure level (3.16) corresponding to the reference equivalent absorption area
in the receiving room
Note 1 to entry: This quantity is denoted by L
XY,n
AT
LL=−k−10lg dB
XY,n XY
01,V6
where
L is the service equipment sound pressure level;
XY
V is the volume of the receiving room in cubic metres;
k is the reverberation index;
in this case, k is calculated from the arithmetic average of the reverberation times measured
for the octave-bands 500 Hz, 1 kHz and 2 kHz.
k = 10lg 1/3 [(T + T + T )/T ] dB
500 1 000 2 000 0
T is the reference reverberation time (T = 0,5 s);
0 0
A is the reference absorption area (A = 10 m );
0 0
0,16 has the unit s/m.
4 Single number quantities
The single number quantities of service equipment noise which can be determined according to this
document are given in Table 1. When reporting measurement results the notation in Table 1 shall be
used. The different quantities can be combined according to e.g. requirements in national building
code regulations. Single number quantities of airborne and impact sound insulation can be obtained
according to ISO 717-1 and ISO 717-2.
Table 1 — Quantities for service equipment sound pressure level
A-weighted value C-weighted value
a a
L L
ASmax CSmax
b b
Maximum sound pressure level, time weighting «S» L L
ASmax,nT CSmax,nT
c c
L L
ASmax,n CSmax,n
a a
L L
AFmax CFmax
b b
Maximum sound pressure level, time weighting «F» L L
AFmax,nT CFmax,nT
c c
L L
AFmax,n CFmax,n
a
No standardization/normalization.
b
Standardization to a reverberation time of 0,5 s.
c 2
Normalization to an equivalent sound absorption area of 10 m .
ISO 10052:2021(E)
Table 1 (continued)
A-weighted value C-weighted value
a a
L L
Aeq Ceq
b b
Equivalent sound pressure level L L
Aeq,nT Ceq,nT
c c
L L
Aeq,n Ceq,n
a
No standardization/normalization.
b
Standardization to a reverberation time of 0,5 s.
c 2
Normalization to an equivalent sound absorption area of 10 m .
5 Instrumentation
The measuring service equipment shall comply with the requirements of Clause 6.
The sound source for measuring sound insulation between rooms shall be as omnidirectional as
practicable. In façade measurement, the opening angle shall cover the whole façade. The directivity
of the sound source and the distance to the façade shall be such that the variations between pressure
levels measured in front of the façade, for each frequency band of interest, are less than 5 dB.
The tapping machine shall comply with the requirements given in ISO 10140-5:2021, Annex E and
ISO 16283-2:2020, Annex A. The heavy/soft impact source – rubber ball shall comply with the
requirements given in ISO 10140-5:2021, Annex F and ISO 16283-2:2020, Annex A.
The accuracy of the sound pressure level measurement equipment shall comply with the requirements
of accuracy classes 1 or 2 defined in IEC 61672-1. The complete measuring system including the
microphone shall be adjusted before each measurement to enable absolute values of sound pressure
levels to be obtained.
For all measurements diffuse field microphones are required. For sound level meters with free field
microphones corrections for accounting the diffuse sound field shall be applied.
Filters shall comply with the requirements defined in IEC 61260.
NOTE For pattern evaluation (type testing) and regular verification tests recommended procedures for
sound level meters are given in OIML R58 and R88.
6 Test procedure and evaluation
6.1 General
The measurements of airborne sound insulation and of impact sound insulation are made in octave
bands. The measurements of service equipment sound pressure levels are made in A-weighted or
C-weighted sound pressure levels. The measurements shall be performed with doors and windows
closed and shutters normally open. Operating cycles and operating conditions for measuring of service
equipment noise shall be given in Annex B. They should only be used if they are not opposed to national
requirements and regulations.
6.2 Generation of sound field
6.2.1 General
If the difference between the signal level and the background noise level is less than 6 dB, the measured
signal level shall be recorded in the report. A note shall be added to say that the measured receiving
room level was affected by background noise and the corresponding level difference has been
underestimated or that the measurement level (service equipment) has been overestimated by an
unknown amount.
8 © ISO 2021 – All rights reserved

ISO 10052:2021(E)
No correction for background noise shall be applied.
For measurements of the airborne sound insulation between rooms and the airborne sound insulation
of façades using the loudspeaker method, the sound power of the source should be adjusted so that the
sound pressure level in the receiving room (in each frequency band) is at least 6 dB higher than the
background noise level. This shall be checked by switching the source on and off before starting the
measurement.
When measuring the airborne sound insulation of façades by the traffic sound method, the background
noise level in the receiving room cannot easily be assessed. Because of this, steps should be taken
to ensure that the noise level in the receiving room due to sources within the building is as low as
practicable. Excessive background noise from internal sources will lead to an underestimate of the
façade insulation. A comment shall be made in the report if this is thought to have occurred.
6.2.2 Airborne sound insulation between rooms
The sound generated in the source room shall be steady and have a continuous spectrum in the
frequency range considered. Filters with a bandwidth of one octave may be used. When using broad-
band noise, the spectrum of the sound source may be shaped to ensure an adequate signal-to-noise
ratio at high frequencies in the receiving room.
If the sound source enclosure contains more than one loudspeaker operating simultaneously, the
loudspeakers shall be driven in phase. Multiple sound sources may be used simultaneously providing
they are of the same type and are driven at the same level by similar, but uncorrelated, signals.
Place the sound source in a corner of the room opposite the separating element. The distance from the
walls shall be at least 0,5 m. If the source is a single loudspeaker system it should be placed facing the
corner.
When testing rooms in a vertical direction, use the lower room as the source room. When testing rooms
of unequal size in a horizontal direction, use the larger room as the source room unless it has been
previously agreed that the test should be in the other direction.
6.2.3 Impact sound insulation between rooms
The impact sound shall be generated by the standard tapping machine and/or rubber ball (see
ISO 10140-5 and ISO 16283-2). The standard impact sound sources; tapping machine and rubber
ball, shall be placed in the source room near the centre of the floor (in case of tapping machine on the
diagonal direction). This single position is sufficient if the floor and slab are isotropic.
NOTE In complex cases, see numerous examples of room arrangements and measurement positions in
ISO 16283-2:2020, Annex E.
In the case of anisotropic floor constructions (with ribs, beams, etc.) add two positions so that the
three positions are randomly distributed over the floor area. The hammer connecting line should
o
be orientated at 45 to the direction of the beams or ribs. In these cases, the distance of the tapping
machine from the edges of the floor shall be at least 0,5 m.
6.2.4 Airborne sound insulation of façades
The airborne sound insulation of façades is measured using an outside loudspeaker or road traffic
sound. The room behind the façade serves as the receiving room.
6.2.4.1 Loudspeaker method
Place the loudspeaker outside the building at a distance d from the façade with the angle of sound
o
incidence as close as possible to 45 (see Figure 1). Choose the position of the loudspeaker and the
distance d to the façade so that the variation of the sound pressure level on the test specimen is
minimized. The sound source is preferably placed on the ground. Alternatively place the sound source
ISO 10052:2021(E)
as high above the ground as practically possible. The distance r from the sound source to the centre of
the test specimen shall be at least 7 m (d > 5 m) from the façade being tested.
Key
1 loudspeaker
2 vertical plane.
3 horizontal plane.
a
Normal to the façade.
Figure 1 — Geometry of the loudspeaker method
The sound generated shall be steady and have a continuous spectrum in the frequency range considered.
Filters with a bandwidth of one octave band may be used. When using broad-band noise the spectrum
of the sound source may be shaped to ensure an adequate signal-to-noise ratio at high frequencies in
the receiving room.
6.2.4.2 Traffic sound method
The traffic sound method with road traffic as sound source may be used if the sound pressure level is
high enough in relation to the background noise in the receiving room. If the sound is incident on the
façade from different directions and with varying intensity, such as road traffic sound in busy streets,
the façade level difference is obtained from the average sound pressure levels measured simultaneously
on both sides of the façade.
NOTE Due to background noise the traffic sound method is normally limited to measure D < 40 dB.
nT,w
6.3 Measurement of sound pressure levels
6.3.1 Airborne and impact sound insulation between rooms
To determine the insulation against airborne sound, measure average sound pressure level in the
source and receiving rooms; to determine insulation against impact sound, measure only in the
receiving room. In both cases measure the average sound pressure level in each of the specified octave
bands using an integrating sound level meter. The measurement time interval shall be approximately
30 s. Stand near the centre of the floor and face away from the loudspeaker in the source room or from
the separating element in the receiving room. Hold the sound level meter out at arm's length. Move the
o
microphone four times horizontally through 180 , moving the arm up and down in a gentle movement
during the traverse (see Figure 2). Complete the four rotations in a total time of approximately 30 s.
10 © ISO 2021 – All rights reserved

ISO 10052:2021(E)
Alternatively, use a rotating microphone on a stand, with an angle of at least 10 degrees to horizontal
and a radius of minimum 1 m. If a parallel octave-band or real time octave-band sound level meter is
not available, carry out this procedure for each octave band, and read each L for 30 s band level from
eq
the meter to obtain an estimate of the average octave band levels in the room.
Figure 2 — Example for movement of the sound level meter
6.3.2 Heavy/soft impact sound insulation between rooms
To determine the insulation against impact sound with the rubber ball, measure only in the receiving
room. Measure the maximum impact sound pressure level in the specified octave bands by Fast time
weighting using a sound level meter. The measurement time shall be approximately 10 s. Stand near the
centre of the room and hold the sound level meter out at arm's length or maintain a fixed microphone
position using a tripod. Select at least two fixed positions including near the centre position with
different height. The distance between the two microphone position shall be longer than 0,7 m.
Preferably measure one or more impacts for each fixed position. The measured maximum impact sound
pressure level should be averaged over all positions in each frequency band of interest.
Measure the maximum impact sound pressure level in each of the specified octave bands (L ).
i,Fmax
If a parallel octave-band or real time octave-band sound level meter is available, select the band
maximum level holding mode. The A-weighted maximum impact sound pressure level (L ), should
iA,Fmax
be calculated according to ISO 717-2:2020, Annex D. The overall A-weighted maximum impact sound
pressure level can be measured directly.
The following separating distances are minimum values and shall be exceeded where practicable:
— 0,5 m between any microphone position and room boundaries;
— 1,0 m between any microphone position and the sound source.
Hearing protectors should be worn by the operator when measuring in the source room.
6.3.3 Airborne sound insulation of façades
Place the outdoor microphone at a distance of (2,0 ± 0,2) m from the plane of the façade or at such
a larger distance that the distance to the part of the façade nearest to the road - for instance the
balustrade - is at least 1 m. If the sound source is a loudspeaker, measure the outdoor sound pressure
level and the indoor level according to 6.3.1. The integration time shall be 30 s.
If the sound source is the prevailing road traffic noise, measure the outdoor level and the indoor level
simultaneously. The integration time shall be 60 s and the indoor level is obtained by repeating the
ISO 10052:2021(E)
procedure of 6.3.1 during this period. During this measurement period at least 15 vehicles shall have
passed.
Making sound (e.g. of clothes) should be avoided when moving the sound level meter (Figure 2).
Sometimes it can be necessary to use 3 or 5 fixed positions.
6.3.4 Service equipment sound pressure level
When the service equipment sound pressure level in the room is measured, two fixed microphone
positions are required. Position 1 shall be close to the apparently acoustically hardest surfaces of room,
preferably at a distance of 0,5 m from the walls and from the floor or ceiling (e.g. close to the corner).
Position 2 shall be in the reverberant field of the room (central room area). The distance to any sound
source (e.g. ventilation outlets) shall be at least 1,5 m.
In total, three measurements shall be performed. Perform one measurement at position 1 close to
the corner and two measurements at position 2. The measurement time interval for each of the three
measurements shall cover one full cycle of the service equipment working under normal conditions.
For each measurement, a separate operation cycle shall be used. The operation cycles shall be given in
Annex B. Calculate the average sound pressure level according to 3.16.
6.4 Frequency range of measurements
The sound pressure levels measured using octave band filters shall cover at least the following midband
frequencies in hertz, as given in Table 2:
Table 2 — Frequency range of measurements
Impact sound insulation using
Airborne sound insulation
Heavy/soft impact sound Tapping m
...