SIST EN ISO 3382-3:2022

SLOVENSKI STANDARD
01-april-2022
Nadomešča:
SIST EN ISO 3382-3:2012
Akustika - Merjenje parametrov prostorske akustike - 3. del: Velike odprte pisarne
(ISO 3382-3:2022)
Acoustics - Measurement of room acoustic parameters - Part 3: Open plan offices (ISO
3382-3:2022)
Akustik - Messung von Parametern der Raumakustik - Teil 3: Großraumbüros (ISO 3382
-3:2022)
Acoustique - Mesurage des paramètres acoustiques des salles - Partie 3: Bureaux
ouverts (ISO 3382-3:2022)
Ta slovenski standard je istoveten z: EN ISO 3382-3:2022
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 3382-3
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2022
EUROPÄISCHE NORM
ICS 91.120.20 Supersedes EN ISO 3382-3:2012
English Version
Acoustics - Measurement of room acoustic parameters -
Part 3: Open plan offices (ISO 3382-3:2022)
Acoustique - Mesurage des paramètres acoustiques des Akustik - Messung von Parametern der Raumakustik -
salles - Partie 3: Bureaux ouverts (ISO 3382-3:2022) Teil 3: Großraumbüros (ISO 3382-3:2022)
This European Standard was approved by CEN on 17 December 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3382-3:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 3382-3:2022) 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 July 2022, and conflicting national standards shall be
withdrawn at the latest by July 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 3382-3:2012.
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 website.
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 3382-3:2022 has been approved by CEN as EN ISO 3382-3:2022 without any
modification.
INTERNATIONAL ISO
STANDARD 3382-3
Second edition
2022-01
Acoustics — Measurement of room
acoustic parameters —
Part 3:
Open plan offices
Acoustique — Mesurage des paramètres acoustiques des salles —
Partie 3: Bureaux ouverts
Reference number
ISO 3382-3:2022(E)
ISO 3382-3:2022(E)
© ISO 2022
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 3382-3:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measurement conditions . 3
4.1 Equipment . 3
4.2 Measurement procedure . 3
4.2.1 Measurement conditions . 3
4.2.2 Acoustic zones and measurement paths . 3
4.2.3 Source and microphone positions . . 4
4.2.4 Measured quantities . 5
5 Determination of single-number values . 5
5.1 Spectrum of normal speech . 5
5.2 Spatial decay rate of speech . . 5
5.2.1 Conventional method . 5
5.2.2 Impulse response method . 8
5.3 Speech level at 4 m distance . 8
5.4 Background noise level . 9
5.5 Speech transmission index . 9
5.6 Comfort distance and distraction distance . 10
5.7 Typical single-number values . . 10
6 Precision .10
7 Test report .10
Annex A (informative) Psychological reasoning of distraction distance .12
Annex B (informative) Alternative methods for determining the spatial decay rate .13
Annex C (informative) Examples of typical single-number values .15
Annex D (informative) Precision .16
Bibliography .17
iii
ISO 3382-3:2022(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 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 3382-3:2012), which has been technically
revised. The main changes compared to the previous edition are as follows:
— new single-number quantity, comfort distance, added, and privacy distance removed;
— sole use of omnidirectional sound source in all measurement phases emphasized;
— definitions (Clause 3), measurement conditions (Clause 4), and determination of single-number
values (Clause 5) clarified;
— use of impulse response method better described and a new Annex B added;
— Clause 6 “Precision” and an informative Annex D were added;
— STI is determined in conformity with IEC 60268-16 using weighting factors α and β for male gender;
A list of all parts in the ISO 3382 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 3382-3:2022(E)
Introduction
Open-plan office is a large and open office space where large number of occupants can simultaneously
work in well-defined workstations. Both flexible offices and activity-based offices often involve spaces
that resemble open-plan offices. Open working areas, which can be considered as open-plan offices, can
also be found in many libraries, hospital wards, industrial workplaces, and schools.
Noise and lack of speech privacy are among the largest contributors to environmental dissatisfaction
[1]
in open-plan offices . Colleagues’ speech is the main source of office noise. Inadequate room acoustic
design of the office is one reason to the perception of noise and lack of speech privacy. Distraction due
to colleagues’ speech weakens the ability to concentrate and reduces work performance, especially in
tasks requiring cognitive resources. Insufficient speech privacy prevents confidential conversations.
[2]
Several experimental studies suggest that distraction can be reduced by reducing speech intelligibility
[3]
. A large field survey supports that reduced speech intelligibility is associated with reduced noise
[4]
disturbance . According to Reference [4], many of the single-number quantities described in this
standard are associated with the perceived noise disturbance in open-plan offices.
The outcomes of this method describe the acoustic performance of the open-plan office in a standardized
[5]
condition where a single occupant is speaking with normal speech effort . The background sound
caused by building appliances or sound masking system is considered in the measurements. The
measurements are conducted in an unoccupied open-plan office because the method concerns
the permanent building properties and stable room acoustic conditions as well as ISO 3382-1 and
ISO 3382-2. The activity sound caused by the occupants does not belong to the scope of this standard,
although the level of activity sound can be significantly larger than the level of background sound.
The method uses omnidirectional sound source to provide reproducible results between measurement
operators. Furthermore, the speaking direction of occupant in the office workstation is not always
known nor constant in time. The use of directional sound sources would lead into different results
between measurement operators due to different choices of source direction and source directivities.
Room acoustic quality can be affected by the amount and positioning of wall and ceiling sound
absorption materials, room geometry, workstations, screens, other furniture, floor coverings, and
background sound level (e.g., masking sound). Presentation of acoustic design guidelines is beyond
the scope of this document because literature gives sufficient advice how to reach good room acoustic
[5][6][7]
quality .
v
INTERNATIONAL STANDARD ISO 3382-3:2022(E)
Acoustics — Measurement of room acoustic parameters —
Part 3:
Open plan offices
1 Scope
This document specifies a method for the measurement of room acoustic parameters in unoccupied
open-plan offices. It specifies measurement procedures, the apparatus needed, the coverage required,
the method for evaluating the data, and the presentation of the test report.
This document describes a group of single-number quantities indicating the room acoustic performance
of an open-plan office in a condition when one person is speaking. They focus on spatial decay of speech
while the quantities in ISO 3382-2 focus on temporal decay of sound.
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 3382-1, Acoustics — Measurement of room acoustic parameters — Part 1: Performance spaces
IEC 60268-16, Sound system equipment — Part 16: Objective rating of speech intelligibility by speech
transmission index
IEC 60942, Electroacoustics — Sound calibrators
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 https:// www .electropedia .org/
3.1
omnidirectional sound source
OSS
sound source which radiates sound evenly to all directions
ISO 3382-3:2022(E)
3.2
spatial decay rate of speech
D
2,S
rate of spatial decay of A-weighted sound pressure level (SPL) of speech per distance doubling in
decibels
Note 1 to entry: D describes how fast the A-weighted SPL of speech attenuates in the open-plan office when the
2,S
distance to OSS increases. Large value means strong room acoustic attenuation. In free field, D = 6 dB.
2,S
3.3
speech level at 4 m distance
L
p,A,S,4m
A-weighted SPL of speech in decibels at the distance of 4,0 m from the middle point of the OSS
Note 1 to entry: Distance between nearby workstations is usually less than 4,0 m. Small value means strong
room acoustic attenuation near the OSS.
3.4
comfort distance
r
C
shortest distance from the middle point of the OSS where the A-weighted SPL of speech is lower than
45 dB
Note 1 to entry: Comfort distance reduces with increasing D and decreasing L .
2,S p,A,S,4m
3.5
background noise level
L
p,B
unweighted SPL of background noise in decibels at the workstations along the measurement path
during working hours when occupants are absent
3.6
speech transmission index
STI
quantity describing the transmission quality of speech from speaker to listener
Note 1 to entry: STI is based on IEC 60268-16.
3.7
distraction distance
r
D
shortest distance from the middle point of the OSS where the STI is lower than 0,50
Note 1 to entry: Distraction distance reduces with decreasing r and increasing L . Smaller values are associated
C p,B
with higher levels of speech privacy. Annex A gives a psychological reasoning of distraction distance.
3.8
workstation
furniture ensemble containing at least one chair and one table having a minimum size of 70 cm x 70 cm
Note 1 to entry: Workstation can also contain other components, such as table-mounted or floor-mounted
screens, storage units, display units, or luminaires.
3.9
sound masking system
centralized or networked electronic system used to produce spatially constant background sound in
the workstation area
ISO 3382-3:2022(E)
4 Measurement conditions
4.1 Equipment
4.1.1 Sound source, OSS shall be used in all measurements. The requirements given in ISO 3382-1
for the OSS within 125 Hz to 4 000 Hz shall be fulfilled for measurements to be in accordance with this
document.
NOTE There are no requirements for the 8 000 Hz octave band.
4.1.2 Microphone, SPLs in each octave band and at each microphone position shall be measured
using a sound level meter meeting the requirements of IEC 61672-1, class 1. The microphone shall be
omnidirectional considering any supplementary equipment connected to it.
4.1.3 Analyser, the octave-band filters of the analyser or analysis software shall comply with
IEC 61260. If the signal is recorded, the recording device shall have the characteristics described in
ISO 3382-1.
4.1.4 Calibrator, the acoustical sensitivity of the measurement system shall be checked using a
sound calibrator that complies with IEC 60942. This is done both before and after each measurement
series. The results of the calibration checks shall be documented. A difference of more than 0,5 dB
between calibration checks shall be an argument to repeat measurements. It is recommended that the
calibration is checked when batteries of the measurement equipment or open-plan office is changed.
4.2 Measurement procedure
4.2.1 Measurement conditions
Measurements can be conducted in open-plan offices of any kind and with any configuration of ceiling
absorbers, wall absorbers, sound masking systems, floor coverings, fixed partitions, workstations,
screens, storage units, and other furniture, whether they are fixed or mobile. The results are valid only
to the specified configuration which prevails during the measurement. Therefore, it is mandatory to
report the abovementioned configurations along with the measurement results.
Background noise means all continuous or non-transient sounds, which are present during normal
working hours and are not caused by the occupants. Such sounds are, e.g., heating, ventilation, and
air conditioning (HVAC) devices, environmental noise caused by sources outside the building, and
electronic sound masking system.
The HVAC devices shall operate on the same power as during typical working hours. If the office is
equipped with a sound masking system, it shall be switched on during the measurement. Sound
masking shall operate at the same level and with the same spectrum as during typical working hours.
Adaptive masking systems can be tested separately for minimum and maximum levels. Appliances
such as refrigerators, printers, coffee machines, radios, and video projectors shall be shut down if they
increase the background noise level in any measurement position. Windows and balcony doors shall
be closed. Occupants shall not be present in the workstations involving measurement positions or OSS.
If the table heights are electrically adjustable, the tabletop height shall be set to (75 ± 5) cm from
the floor corresponding to the tabletop height of a sitting occupant. The setting shall be made in the
workstations located along the measurement path and in the workstation containing the OSS.
4.2.2 Acoustic zones and measurement paths
Acoustic zone means an area in the open-plan office, where the absorption treatment, room height, and
workstation layout are similar. Open-plan office can contain one or several acoustic zones. If the open-
plan office contains two or more acoustic zones, the measurements should be conducted in each of
them. Separate results are reported for each acoustic zone, where measurements have been conducted.
ISO 3382-3:2022(E)
At least two separate measurement paths shall be used per acoustic zone. If only one measurement path
is possible in a zone, measurements shall be conducted in both directions along this measurement path.
4.2.3 Source and microphone positions
The measurements shall be conducted along a straightest possible path which crosses over
workstations, as shown in Figure 1.
Key
1 straight measurement path
2 non-straight measurement path
Figure 1 — Example of a straight and a non-straight measurement path in an open-plan office,
where workstations and other furniture are present
(position of the OSS is in the end of a path)
If the acoustic zone contains high piece of furniture (such as screens, dividers, or storage units being
higher than 1,20 m) between workstations, the measurement path should be chosen in such a way that
there is such a high piece of furniture between the OSS and the first measurement position.
The OSS is located at the workstation at the end of the path. The OSS shall be located at the position of
a sitting occupant’s head in a workstation. The middle point of the OSS shall be at the height of 1,20 m
above the floor. The distance between the middle point of the OSS and a nearest table shall be at least
0,40 m. The distance between the middle point of the OSS and nearest wall of the room shall be at least
1,00 m. Discrepancy from this requirement shall be mentioned in the report.
All workstations along the measurement path shall be measured and considered in the analysis. The
number of measurement positions on a path shall be at least four. In other words, measurements
according to this standard are only possible if measurement path involves at least five consecutive
workstations. The preferred number of successive measurement positions on the path is six to ten.
Measurement positions locating farther than 16 m from OSS are not necessary, but they can facilitate
the determination of r , if it is larger than 16 m.
D
The reference position shall be located at the distance of 1,00 m from the middle point of the OSS without
any separating obstacles, such as a screen, between the OSS and the microphone. The reference position
can locate in another direction than the measurement path if an obstacle prevents the abovementioned
condition. The reference position is not a measurement position affecting the reported single-number
values. It enables a post check of the actual sound power level of the OSS. The value at the reference
position can be shown in spatial decay curves of both A-weighted SPL of speech and STI to provide
additional information about the acoustic conditions at short conversation distance.
ISO 3382-3:2022(E)
The actual measurement positions, which affect the reported single-number values, shall be located at
workstations along the measurement path at the position of a sitting occupant’s head, which is 1,20 m
above the floor. Standing occupant is not considered in this document. The distance of the microphone
positions shall be at least 1,00 m from the nearest wall of the room. Discrepancy from this requirement
shall be mentioned in the report. Chairs are moved away from the workstations of the measurement
path during the measurements. The first measurement position shall be located at the workstation
nearest to the OSS.
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