SIST EN ISO 16283-2:2020

SLOVENSKI STANDARD
01-november-2020
Nadomešča:
SIST EN ISO 16283-2:2018
Akustika - Terenska merjenja zvočne izolirnosti v stavbah in zvočne izolirnosti
stavbnih elementov - 2. del: Izolirnost pred udarnim zvokom (ISO 16283-2:2020)
Acoustics - Field measurement of sound insulation in buildings and of building elements -
Part 2: Impact sound insulation (ISO 16283-2:2020)
Akustik - Messung der Schalldämmung in Gebäuden und von Bauteilen am Bau - Teil 2:
Trittschalldämmung (ISO 16283-2:2020)
Acoustique - Mesurage in situ de l'isolation acoustique des bâtiments et des éléments de
construction - Partie 2: Isolation des bruits d'impacts (ISO 16283-2:2020)
Ta slovenski standard je istoveten z: EN ISO 16283-2:2020
ICS:
17.140.01 Akustična merjenja in Acoustic measurements and
blaženje hrupa na splošno noise abatement 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 16283-2
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2020
EUROPÄISCHE NORM
ICS 91.060.30; 91.120.20 Supersedes EN ISO 16283-2:2018
English Version
Acoustics - Field measurement of sound insulation in
buildings and of building elements - Part 2: Impact sound
insulation (ISO 16283-2:2020)
Acoustique - Mesurage in situ de l'isolation acoustique Akustik - Messung der Schalldämmung in Gebäuden
des bâtiments et des éléments de construction - Partie und von Bauteilen am Bau - Teil 2: Trittschalldämmung
2: Isolation des bruits d'impacts (ISO 16283-2:2020) (ISO 16283-2:2020)
This European Standard was approved by CEN on 20 August 2020.

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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16283-2:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 16283-2:2020) 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 February 2021, and conflicting national standards
shall be withdrawn at the latest by February 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 16283-2:2018.
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 16283-2:2020 has been approved by CEN as EN ISO 16283-2:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 16283-2
Third edition
2020-07
Acoustics — Field measurement of
sound insulation in buildings and of
building elements —
Part 2:
Impact sound insulation
Acoustique — Mesurage in situ de l'isolation acoustique des
bâtiments et des éléments de construction —
Partie 2: Isolation des bruits d'impacts
Reference number
ISO 16283-2:2020(E)
©
ISO 2020
ISO 16283-2:2020(E)
© ISO 2020
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.
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Phone: +41 22 749 01 11
Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 16283-2:2020(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Instrumentation . 5
4.1 General . 5
4.2 Calibration . 5
4.3 Verification . 5
5 Frequency range . 6
5.1 Tapping machine as the impact source . 6
5.2 Rubber ball as the impact source . 6
6 General . 6
7 Default procedure for sound pressure level measurement . 7
7.1 General . 7
7.2 Generation of sound field . 7
7.2.1 General. 7
7.2.2 Impact source positions for the tapping machine as impact source . 7
7.2.3 Impact source positions for the rubber ball as impact source . 8
7.3 Fixed microphone positions for the tapping machine or rubber ball as impact source . 8
7.3.1 General. 8
7.3.2 Number of measurements . 8
7.3.3 Tapping machine operated at more than one position . 8
7.3.4 Rubber ball operated at more than one position . 9
7.4 Mechanized continuously moving microphone for the tapping machine as impact source 9
7.4.1 General. 9
7.4.2 Number of measurements .10
7.4.3 Tapping machine operated at more than one position .10
7.5 Manually scanned microphone for the tapping machine as impact source .10
7.5.1 General.10
7.5.2 Number of measurements .10
7.5.3 Tapping machine operated at more than one position .10
7.5.4 Circle .10
7.5.5 Helix .10
7.5.6 Cylindrical-type . .11
7.5.7 Three semicircles .11
7.6 Minimum distances for microphone positions .12
7.7 Averaging times for the tapping machine as impact source .12
7.7.1 Fixed microphone positions.12
7.7.2 Mechanized continuously moving microphone .13
7.7.3 Manually scanned microphone .13
7.8 Calculation of energy-average sound pressure levels .13
7.8.1 Fixed microphone positions for the tapping machine as impact source .13
7.8.2 Mechanized continuously moving microphone and manually scanned
microphone for the tapping machine as impact source .13
7.8.3 Fixed microphone positions for the rubber ball as impact source .14
8 Low-frequency procedure for sound pressure level measurement for the tapping
machine as impact source .14
8.1 General .14
8.2 Generation of sound field .14
8.2.1 General.14
ISO 16283-2:2020(E)
8.2.2 Impact source positions .14
8.3 Microphone positions .14
8.4 Averaging time .15
8.5 Calculation of low-frequency energy-average impact sound pressure levels .15
9 Background noise (default and low-frequency procedure) .16
9.1 General .16
9.2 Correction to the signal level for background noise .17
10 Reverberation time in the receiving room (default and low-frequency procedure) .18
10.1 General .18
10.2 Generation of sound field .18
10.3 Default procedure .18
10.4 Low-frequency procedure .18
10.5 Interrupted noise method .19
10.6 Integrated impulse response method .19
11 Conversion to octave bands .19
12 Expression of results .20
13 Uncertainty .20
14 Test report .20
Annex A (normative) Impact sources .21
Annex B (normative) Requirements for loudspeakers used for reverberation time
measurements .27
Annex C (informative) Forms for the expression of results .28
Annex D (informative) Additional guidance .32
Annex E (informative) Horizontal measurements — Examples of suitable impact source
and microphone positions.36
Annex F (informative) Vertical measurements — Examples of suitable impact source and
microphone positions .40
Bibliography .43
iv © ISO 2020 – All rights reserved

ISO 16283-2:2020(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 third edition cancels and replaces the second edition (ISO 16283-2:2018), which has been
technically revised.
The main changes compared to the previous edition are as follows:
a) Clause 6, Note 3 removed;
b) in the helical path (7.5.5) distance of the microphone position to the ceiling changed to
minimum 0,5 m;
c) L′ added to the expression of results and to Figure C.3.
iA,Fmax,V,T
A list of all parts in the ISO 16283 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.
ISO 16283-2:2020(E)
Introduction
ISO 16283 (all parts) describes procedures for field measurements of sound insulation in buildings.
Airborne, impact and façade sound insulation are described in ISO 16283-1, this document (ISO 16283-2)
and ISO 16283-3, respectively.
1) 2)
Field sound insulation measurements that were described previously in ISO 140-4 , ISO 140-5 , and
3)
ISO 140-7 were a) primarily intended for measurements where the sound field could be considered
to be diffuse, and b) not explicit as to whether operators could be present in the rooms during the
measurement. ISO 16283 (all parts) differs from ISO 140-4, ISO 140-5, and ISO 140-7 in that:
a) it applies to rooms in which the sound field may or may not approximate to a diffuse field;
b) it clarifies how operators can measure the sound field using a hand-held microphone or sound
level meter;
4)
c) it includes additional guidance that was previously contained in ISO 140-14 .
NOTE Survey test methods for field measurements of airborne and impact sound insulation are dealt with in
ISO 10052.
Two impact sources are described: the tapping machine and the rubber ball. These impact sources do
not exactly replicate all possible types of real impacts on floors or stairs in buildings.
The tapping machine can be used to assess a variety of light, hard impacts such as footsteps from
walkers wearing hard-heeled footwear or dropped objects. A single number quantity can be calculated
using the rating procedures in ISO 717-2. This single number quantity links the measured impact
sound insulation using the tapping machine to subjective assessment of general impacts in dwellings
that occur on floors or stairs in a building. The tapping machine is also well-suited to the prediction
of impact sound insulation using ISO 12354-2. These two aspects facilitate the specification of impact
sound insulation in national building requirements using only measurements with the tapping machine
as an impact source.
The rubber ball can be used to assess heavy, soft impacts such as from walkers in bare feet or children
jumping, as well as quantifying absolute values that can be related to human disturbance in terms of a
Fast time-weighted maximum sound pressure level.
1)  Withdrawn.
2)  Withdrawn.
3)  Withdrawn.
4)  Withdrawn.
vi © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 16283-2:2020(E)
Acoustics — Field measurement of sound insulation in
buildings and of building elements —
Part 2:
Impact sound insulation
1 Scope
This document specifies procedures to determine the impact sound insulation using sound pressure
measurements with an impact source operating on a floor or stairs in a building. These procedures are
3 3
intended for room volumes in the range from 10 m to 250 m in the frequency range from 50 Hz to
5 000 Hz. The test results can be used to quantify, assess and compare the impact sound insulation in
unfurnished or furnished rooms where the sound field may or may not approximate to a diffuse field.
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 12999-1, Acoustics — Determination and application of measurement uncertainties in building
acoustics — Part 1: Sound insulation
ISO 18233, Acoustics — Application of new measurement methods in building and room acoustics
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
IEC 60942, Electroacoustics — Sound calibrators
IEC 61183, Electroacoustics — Random-incidence and diffuse-field calibration of sound level meters
IEC 61260 (all parts), 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 16283-2:2020(E)
3.1
energy-average impact sound pressure level in a room
L
i
ten times the common logarithm of the ratio of the space and time average of the squared sound
pressure to the square of the reference sound pressure where the impact source is the tapping machine
and the space average is taken over the central zone of the room where nearfield radiation from the
room boundaries has negligible influence
Note 1 to entry: L is expressed in decibels (dB).
i
3.2
corner impact sound pressure level in a room
L
i,Corner
ten times the common logarithm of the ratio of the highest time average squared sound pressure from
the set of corner measurements to the square of the reference sound pressure for the low-frequency
range (50 Hz, 63 Hz and 80 Hz one-third octave bands) where the impact source is the tapping machine
Note 1 to entry: L is expressed in decibels (dB).
i,Corner
3.3
low-frequency energy-average impact sound pressure level in a room
L
i,LF
ten times the common logarithm of the ratio of the space and time average of the squared sound
pressure to the square of the reference sound pressure in the low-frequency range (50 Hz, 63 Hz and
80 Hz one-third octave bands) where the impact source is the tapping machine and the space average
is a weighted average that is calculated using the room corners where the sound pressure levels are
highest and the central zone of the room where nearfield radiation from the room boundaries has
negligible influence
Note 1 to entry: L is expressed in decibels (dB).
i,LF
Note 2 to entry: L is an estimate of the energy-average sound pressure level for the entire room volume.
i,LF
3.4
energy-average maximum impact sound pressure level in a room
L
i,Fmax
ten times the common logarithm of the ratio of the space average of the squared maximum sound
pressure with Fast time weighting to the square of the reference sound pressure where the impact
source is the rubber ball and the space average is taken over the central zone of the room where
nearfield radiation from the room boundaries has negligible influence
Note 1 to entry: L is expressed in decibels (dB).
i,Fmax
3.5
reverberation time
T
time required for the sound pressure level in a room to decrease by 60 dB after the sound source
has stopped
Note 1 to entry: T is expressed in seconds (s).
3.6
background noise level
measured sound pressure level in the receiving room from all sources except the impact source
3.7
fixed microphone
microphone that is fixed in space by using a device such as a tripod so that it is stationary
2 © ISO 2020 – All rights reserved

ISO 16283-2:2020(E)
3.8
mechanized continuously moving microphone
microphone that is mechanically moved with approximately constant angular speed in a circle, or is
mechanically swept along a circular path where the angle of rotation about a fixed axis is between 270°
and 360°
3.9
manually scanned microphone
microphone attached to a hand-held sound level meter or an extension rod that is moved by a human
operator along a prescribed path
3.10
manually held microphone
microphone attached to a hand-held sound level meter or a rod that is hand-held at a fixed position by a
human operator at a distance of at least an arm’s length from the trunk of the operator’s body
3.11
partition
total surface of the floor or stair which is excited by the impact source
Note 1 to entry: For two rooms which are staggered vertically or horizontally, the total surface of the separating
partition is not visible from both sides of the partition; hence it is necessary to define the partition as the total
surface.
3.12
common partition
part of the floor or stair that is common to both the room in which the impact source is used and the
receiving room
3.13
standardized impact sound pressure level
L′
nT
energy-average impact sound pressure level (L ) (3.1), reduced by a correction term that is given in
i
decibels, being ten times the common logarithm of the ratio of the measured reverberation time (T)
(3.5), to the reference reverberation time, T , which is calculated using Formula (1) when the impact
source is the tapping machine:
T
′
LL=−10lg (1)
niT
T
where
T is the reverberation time in the receiving room, in s;
T is the reference reverberation time, in s (for dwellings, T = 0,5 s).
0 0
Note 1 to entry: L′ is expressed in decibels (dB).
nT
Note 2 to entry: The impact sound pressure level is referenced to a reverberation time (3.5) of 0,5 s because, in
dwellings with furniture, the reverberation time has been found to be reasonably independent of volume and
frequency and to be approximately equal to 0,5 s.
Note 3 to entry: L′ provides a straightforward link to the subjective impression of impact sound insulation.
nT
ISO 16283-2:2020(E)
3.14
equivalent absorption area
A
hypothetical area of a totally absorbing surface without diffraction effects which, if it were the only
absorbing element in the room, would give the same reverberation time (3.5) as the room under
consideration and is calculated using Sabine's formula in Formula (2):
01, 6V
A= (2)
T
where
V is the receiving room volume, in m ;
T is the reverberation time in the receiving room, in s.
Note 1 to entry: A is expressed in square metres (m ).
3.15
normalized impact sound pressure level
L′
n
energy-average impact sound pressure level (L ) (3.1), increased by a correction term that is given
i
in decibels, being ten times the common logarithm of the ratio between the measured equivalent
absorption area (A) (3.14), of the receiving room and the reference equivalent absorption area, A , which
is calculated using Formula (3) when the impact source is the tapping machine:
A
′
LL=+10lg (3)
ni
A
where
A is the equivalent absorption area in the receiving room, in m ;
2 2
A is the reference equivalent absorption area, in m (for dwellings, A = 10 m ).
0 0
Note 1 to entry: L′ is expressed in decibels (dB).
n
3.16
standardized maximum impact sound pressure level
L′
i,Fmax,V,T
energy-average maximum impact sound pressure level (L ) (3.4), increased by a correction term for
i,Fmax
room volume and reduced by a correction term for reverberation time and Fast time weighting, which
is calculated using Formulae (4), (5) and (6) when the impact source is the rubber ball:
  −1 
−−1
−1
−1 −−1 C
()
()1−C
1−C  
V CC−
′
LL=+10lg −10lg (4)
 
 
iF,amix,VT, ,Fmax
−1
−1
V −1 −1
1−C
−−1 C
0   1−C () 
()
 0 0 
CC−
  
0 0
T
C = (5)
1,7275
T
C= (6)
1,7275
where
4 © ISO 2020 – All rights reserved

ISO 16283-2:2020(E)
T is the reverberation time in the receiving room, in s;
T is the reference reverberation time, in s (for dwellings, T = 0,5 s);
0 0
V is the receiving room volume, in m ;
3 3
V is the reference receiving room volume, in m (for dwellings, V = 50 m ).
0 0
Note 1 to entry: L′ is expressed in decibels (dB).
i,Fmax,V,T
Note 2 to entry: Background information can be found in Reference [1].
4 Instrumentation
4.1 General
The instruments for measuring sound pressure levels, including microphone(s) as well as cable(s),
windscreen(s), recording devices and other accessories, if used, shall meet the requirements for a
class 0 or 1 instrument in accordance with IEC 61672-1 for random incidence application.
Filters shall meet the requirements for a class 0 or 1 instrument in accordance with IEC 61260 (all parts).
The reverberation time measurement equipment shall comply with the requirements defined in
ISO 3382-2.
The impact sources shall meet the requirements given in Annex A.
4.2 Calibration
At the beginning and at the end of every measurement session and at least at the beginning and the
end of each measurement day, the entire sound pressure level measuring system shall be checked at
one or more frequencies by means of a sound calibrator meeting the requirements for a class 0 or 1
instrument in accordance with IEC 60942. Each time the calibrator is used, the sound pressure level
measured with the calibrator should be noted in the field documentation of the operator. Without any
further adjustment, the difference between the readings of two consecutive checks shall be less than
or equal to 0,5 dB. If this value is exceeded, the results of measurements obtained after the previous
satisfactory check shall be discarded.
4.3 Verification
Conformance of the sound pressure level measuring instrument, the filters and the sound calibrator
with the relevant requirements shall be verified by the existence of a valid certificate of conformance.
If applicable, random incidence response of the microphone shall be verified by a procedure from
IEC 61183. All conformance testing shall be conducted by a laboratory meeting the requirements of
ISO/IEC 17025 and ensuring metrological traceability to the appropriate measurement standards.
The sound calibrator should be calibrated at intervals not exceeding one year, the conformance of
the instrumentation system with the requirements of IEC 61672-1 should be verified at intervals not
exceeding two years, and the conformance of the filter set with the requirements of IEC 61260 (all parts)
should be verified at intervals not exceeding two years.
ISO 16283-2:2020(E)
5 Frequency range
5.1 Tapping machine as the impact source
All quantities shall be measured using one-third octave band filters having at least the following
centre frequencies, in hertz: 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1 000, 1 250, 1 600, 2 000,
2 500, 3 150.
If additional information in the low-frequency range is required, use one-third octave band filters with
the following centre frequencies, in hertz: 50, 63, 80.
If additional information in the high-frequency range is required, use one-third octave band filters with
the following centre frequencies, in hertz: 4 000, 5 000.
NOTE Measurement of additional information in the low- and high-frequency ranges is optional.
5.2 Rubber ball as the impact source
All quantities shall be measured using one-third octave or octave band filters.
One-third octave band filters shall have at least the following centre frequencies, in hertz: 50, 63, 80,
100, 125, 160, 200, 250, 315, 400, 500, 630.
6 General
To determine the impact sound insulation, one room shall be chosen as the receiving room into which
sound is radiated due to an impact source operating on a partition. The room or space in which the
impact source is operated is referred to as the source room.
The measurements that shall be performed include the sound pressure levels in the receiving room
with the impact source operating, the background noise levels in the receiving room when the impact
source is switched off and the reverberation times in the receiving room.
Two impact sources are described: the tapping machine and the rubber ball.
Two measurement procedures are described that shall be used for the sound pressure level, the
reverberation time and the background noise: a default procedure and an additional low-frequency
procedure.
For the sound pressure level and the background noise, the default procedure requires measurements
to be taken in the central zone of a room at positions away from the room boundaries. With the
tapping machine as the impact source, the default procedure for all frequencies is to obtain the energy-
average sound pressure level using a fixed microphone or a manually held microphone moved from
one position to another, an array of fixed microphones, a mechanized continuously moving microphone
or a manually scanned microphone. With the rubber ball as the impact source, the default procedure
for all frequencies is to obtain the energy-average sound pressure level using a fixed microphone or a
manually held microphone moved from one position to another or an array of fixed microphones.
For the sound pressure level and the background noise with the tapping machine as the impact source,
the low-frequency procedure shall be used for the 50 Hz, 63 Hz and 80 Hz one-third octave bands in
the receiving room when its volume is smaller than 25 m (calculated to the nearest cubic metre).
This procedure should be carried out in addition to the default procedure and requires additional
measurements of the sound pressure level in the corners of the receiving room using either a fixed
microphone or a manually held microphone.
NOTE 1 The low-frequency procedure is necessary in small rooms due to large spatial variations in the
sound pressure level of the modal sound field. In these situations, corner measurements are used to improve the
repeatability, reproducibility and relevance to room occupants.
6 © ISO 2020 – All rights reserved

ISO 16283-2:2020(E)
NOTE 2 The low-frequency procedure is not used with the rubber ball because no link has yet been shown
between any combination of measurements from the corners and central zone of a room for the maximum Fast
time-weighted sound pressure level and the maximum Fast time-weighted sound pressure level that is spatially
averaged over the entire room volume.
For the reverberation time, the low-frequency procedure shall be used for the 50 Hz, 63 Hz and 80 Hz
one-third octave bands in the receiving room when its volume is smaller than 25 m (calculated to the
nearest cubic metre).
If the methods of signal processing for reverberation times described in ISO 18233 are applied, the
measurements shall be carried out using fixed microphones and shall not use a mechanized continuously
moving microphone, a manually held microphone or a manually scanned microphone.
The sound fields in typical rooms rarely approximate to a diffuse sound field over the entire frequency
range from 50 Hz to 5 000 Hz. The default and low-frequency procedures allow for measurements to be
taken without any knowledge as to whether the sound field can be considered as diffuse or non-diffuse.
For this reason, the sound field should not be modified for the purpose of the test by temporarily
introducing additional furniture or diffusers into the receiving room.
NOTE 3 If measurements with additional diffusion are required, for example due to regulatory requirements
or because the test result is to be compared with a laboratory measurement on a similar test element, the
introduction of three diffusers, each with an area of at least 1,0 m , is usually sufficient.
All measurement methods for the default procedure or the low-frequency procedure are equivalent.
In case of dispute, the impact sound insulation determined using measurement methods without an
operator inside the receiving room shall be taken to be the reference result.
NOTE 4 A reference result is defined because the background noise level with manual scanning is prone to
variation in the self-generated noise from the operator. Significant variation does not tend to occur with fixed
microphones or a mechanized continuously moving microphone.
7 Default procedure for sound pressure level measurement
7.1 General
Sound pressure level measurements shall be used to determine the average level in the central zone of
the receiving room with the impact source in operation and the background noise level in the receiving
room when the impact source is not operational.
Additional guidance on measurement procedures is given in Annexes D, E and F.
7.2 Generation of sound field
7.2.1 General
The impact sound shall be generated using the tapping machine or the rubber ball as the impact source.
7.2.2 Impact source positions for the tapping machine as impact source
The tapping machine shall be placed in at least four different positions randomly distributed on the
floor under test. The distance of the tapping machine from the edges of the floor shall be at least 0,5 m.
In the case of anisotropic floor constructions with beams, ribs, etc., more positions can be necessary.
The hammer connecting line should be orientated at 45° to the direction of the beams or ribs.
The impact sound pressure levels can reveal a time dependency after the tapping is started. In such a
case, the measurements should not begin until the noise level has become steady. If stable conditions are
ISO 16283-2:2020(E)
not reached after 5 min, then the measurements should be carried out over a well-defined
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