Acoustics - Measurement of airborne noise emitted by information technology and telecommunications equipment (ISO 7779:2018)

This document specifies procedures for measuring and reporting the noise emission of information technology and telecommunications equipment.
NOTE 1    This document is considered part of a noise test code (see 3.1.2) for this type of equipment and is based on basic noise emission standards (see 3.1.1) ISO 3741, ISO 3744, ISO 3745, ISO 9295 and ISO 11201.
The basic emission quantity is the A-weighted sound power level, which can be used for comparing equipment of the same type but from different manufacturers, or for comparing different equipment.
Three basic noise emission standards for determination of the sound power levels are specified in this document in order to avoid undue restriction on existing facilities and experience. ISO 3741 specifies comparison measurements in a reverberation test room; ISO 3744 and ISO 3745 specify measurements in an essentially free field over a reflecting plane. Any of these three basic noise emission standards can be selected and used exclusively in accordance with this document when determining sound power levels of a machine.
The A-weighted sound power level is supplemented by the A-weighted emission sound pressure level determined at the operator position or the bystander positions, based on basic noise emission standard ISO 11201. This sound pressure level is not a level of noise immission at a work station (see 3.2.12), but it can assist in identifying any potential problems that could cause annoyance, activity interference or hearing damage to operators and bystanders.
Methods for determination of whether the noise emission includes prominent discrete tones are specified in Annex D.
This document is suitable for type tests and provides methods for manufacturers and testing laboratories to obtain comparable results.
The methods specified in this document allow the determination of noise emission levels for a functional unit (see 3.1.4) tested individually.
The procedures apply to equipment which emits broad-band noise, narrow-band noise and noise which contains discrete-frequency components, or impulsive noise.
The sound power and emission sound pressure levels obtained can serve noise emission declaration and comparison purposes (see ISO 9296[3]).
NOTE 2    The sound power levels and emission sound pressure levels obtained are not intended to be considered as installation noise immission levels; however, they can be used for installation planning (see ECMA TR/27[11]).
If sound power levels obtained are determined for a number of functional units of the same production series, they can be used to determine a statistical value for that production series (see ISO 9296[3]).

Akustik - Geräuschemissionsmessung an Geräten der Informations- und Telekommunikationstechnik (ISO 7779:2018)

Dieses Dokument legt Verfahren zur Messung und Angabe des Geräusches fest, das von Geräten der Informations- und Telekommunikationstechnik abgestrahlt wird.
ANMERKUNG 1   Dieses Dokument gilt als Teil einer maschinenspezifischen Geräuschmessnorm (siehe 3.1.2) für diese Art von Geräten. Es beruht auf den Geräuschemissions-Grundnormen (siehe 3.1.1) ISO 3741, ISO 3744, ISO 3745, ISO 9295 und ISO 11201.
Als Grundgröße dient der A-bewertete Schallleistungspegel, der zum Vergleich von Geräten derselben Bauart jedoch verschiedener Hersteller sowie zum Vergleich von unterschiedlichen Geräten herangezogen werden kann.
In diesem Dokument werden drei Geräuschemissions-Grundnormen zur Bestimmung der Schallleistungs-pegel festgelegt, um ungerechtfertigte Einschränkungen bezüglich vorhandener Prüfeinrichtungen und Erfahrungen zu vermeiden. ISO 3741 beschreibt Vergleichsmessungen in einem Hallraum; ISO 3744 und ISO 3745 beschreiben Messungen in einem im Wesentlichen freien Schallfeld über einer reflektierenden Ebene. Jede dieser drei Geräuschemissions-Grundnormen kann ausgewählt und ausschließlich entsprechend dieses Dokuments für die Bestimmung der Schallleistungspegel einer Maschine angewandt werden.
Der A-bewertete Schallleistungspegel wird durch den A-bewerteten Emissions-Schalldruckpegel am Arbeitsplatz oder an Nachbararbeitsplätzen eines Gerätes ergänzt, die nach der Geräuschemissions-Grundnorm ISO 11201 bestimmt werden. Dieser Schalldruckpegel ist nicht der Immissionsschallpegel an einem Arbeitsplatz (siehe 3.2.12), aber er kann bei der Feststellung jeglicher möglicher Probleme helfen, die Belästigung, Störung von Aktivitäten oder Gehörschäden an Bediener und Umstehenden verursachen können.

Acoustique - Mesurage du bruit aérien émis par les équipements liés aux technologies de l'information et aux télécommunications (ISO 7779:2018)

Le présent document spécifie des modes opératoires de mesurage et d'indication de l'émission sonore des équipements liés aux technologies de l'information et aux télécommunications.
NOTE 1    Le présent document est considéré comme faisant partie d'un code d'essai acoustique (voir 3.1.2) pour ce type d'équipement, et est fondé sur les normes de base sur l'émission sonore (voir 3.1.1), l'ISO 3741, l'ISO 3744, l'ISO 3745, l'ISO 9295 et l'ISO 11201.
La grandeur fondamentale d'émission sonore est le niveau de puissance acoustique pondéré A qui peut être utilisé pour la comparaison d'équipements de même type mais de fabricants différents, ou pour la comparaison de différents équipements.
Trois normes de base, relatives à l'émission sonore, permettant de déterminer les niveaux de puissance acoustique, sont spécifiées dans le présent document de façon à éviter une restriction excessive des installations et des pratiques existantes. L'ISO 3741 spécifie les mesurages de comparaison dans une salle d'essai réverbérante; l'ISO 3744 et l'ISO 3745 spécifient les mesurages dans les conditions approchant celles du champ libre au-dessus d'un plan réfléchissant. L'une ou l'autre de ces trois normes de base relatives à l'émission sonore est susceptible d'être sélectionnée et utilisée exclusivement conformément au présent document lors de la détermination des niveaux de puissance acoustique d'une machine.
Le niveau de puissance acoustique pondéré A est complété par le niveau de pression acoustique d'émission pondéré A déterminé à la position d'opérateur ou aux positions d'assistant, par rapport à la norme de base relative à l'émission sonore ISO 11201. Ce niveau de pression acoustique n'est pas un niveau de bruit ambiant à un poste de travail (voir 3.2.12), mais peut être utile à l'identification de tout problème potentiel pouvant engendrer un désagrément, une interférence avec l'activité, ou des lésions auditives aux opérateurs et assistants.
Les méthodes permettant de déterminer si l'émission sonore comporte des composantes tonales discrètes émergentes sont spécifiées dans l'Annexe D.
Le présent document convient aux essais de type et fournit des méthodes pour les fabricants et les laboratoires d'essais permettant d'obtenir des résultats comparables.
Les méthodes spécifiées dans le présent document permettent la détermination de niveaux d'émission sonore pour une unité fonctionnelle (voir 3.1.4) soumise à essai individuellement.
Les modes opératoires sont applicables à l'équipement qui émet un bruit à large bande, un bruit à bande étroite, un bruit comprenant des composantes tonales discrètes, ou un bruit impulsionnel.
Les niveaux de puissance acoustique et de pression acoustique d'émission obtenus peuvent servir aux besoins de déclaration d'émission sonore et aux fins de comparaison (voir l'ISO 9296[3]).
NOTE 2    Les niveaux de puissance acoustique et de pression acoustique d'émission obtenus ne doivent pas être considérés comme des niveaux de bruit ambiant de l'installation; toutefois, ils peuvent être utilisés pour la planification de l'utilisation de l'installation (voir l'ECMA TR/27[11]).
Si les niveaux de puissance acoustique obtenus sont déterminés pour un certain nombre d'unités fonctionnelles de la même série de production, ils peuvent être utilisés pour déterminer une valeur statistique pour cette même série (voir l'ISO 9296[3]).

Akustika - Merjenje emisije hrupa informacijskih in telekomunikacijskih naprav (ISO 7779:2018)

Ta dokument določa postopke za merjenje in beleženje emisij hrupa informacijskih in telekomunikacijskih naprav.
OPOMBA 1: Ta dokument se obravnava kot del oznake preskusa hrupa (glej 3.1.2) za to vrsto naprav in temelji na osnovnih standardih za emisije hrupa (glej 3.1.1) ISO 3741, ISO 3744, ISO 3745, ISO 9295 in ISO 11201.
Osnovni obseg emisij je A-vrednotena raven zvočne moči, ki jo je mogoče uporabiti za primerjavo naprav iste vrste, vendar različnih proizvajalcev, ali za primerjavo različnih naprav. V tem dokumentu so opredeljeni trije osnovni standardi za emisije hrupa za določanje ravni zvočne moči, da bi se izognili pretiranemu omejevanju obstoječih zmožnosti in izkušenj. Standard ISO 3741 določa primerjalne meritve v prostoru za preskus odmevov, standarda ISO 3744 in ISO 3745 pa določata meritve v polju, ki je v osnovi prosto, nad odbojno ravnino. Pri določanju ravni zvočne moči stroja je mogoče izbrati katerega koli od teh treh osnovnih standardov za emisije hrupa in jih uporabiti izključno v skladu s tem dokumentom.
A-vrednotena raven zvočne moči je nadomeščena z A-vrednoteno ravnjo zvočnega tlaka, določeno na položaju upravljavca ali položajih navzočih oseb na podlagi osnovnega standarda za emisije hrupa ISO 11201. Ta raven zvočnega tlaka ni raven emisije hrupa na delovnem mestu (glej 3.2.12), vendar lahko pomaga pri prepoznavanju potencialnih težav, ki bi lahko upravljavce ali navzoče osebe vznemirjale, jih motile pri delu ali jim povzročile poškodbe sluha.
Metode za ugotavljanje, ali emisija hrupa vključuje izrazit diskreten zvok, so določene v dodatku D.
Ta dokument je primeren za tipske preskuse in podaja metode, s katerimi proizvajalci in laboratoriji za preskušanje pridobijo primerljive rezultate.
Metode, določene v tem dokumentu, omogočajo določanje ravni emisije hrupa za funkcijsko enoto (glej 3.1.4), ki se preskuša posamično.
Postopki se ne uporabljajo za naprave, ki oddajajo širokopasovni hrup, ozkopasovni hrup in hrup, ki vsebuje diskretne frekvence oziroma impulzni hrup.
Pridobljene ravni zvočne moči in emisij zvočnega tlaka je mogoče uporabiti za namene deklaracije o emisijah hrupa
in primerjave (glej ISO ISO 9296[3]).
OPOMBA 2: Pridobljene ravni zvočne moči in ravni emisij zvočnega tlaka se ne štejejo kot ravni emisij hrupa inštalacij, vendar jih je mogoče uporabiti za načrtovanje inštalacij (glej ECMA TR/27[11]).
Če so pridobljene ravni zvočne moči določene za število funkcijskih enot iz iste proizvodne
serije, jih je mogoče uporabiti za določanje statistične vrednosti dane proizvodne serije (glej ISO 9296[3]).

General Information

Status
Published
Publication Date
11-Dec-2018
Technical Committee
Drafting Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
12-Dec-2018
Completion Date
12-Dec-2018

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SLOVENSKI STANDARD
SIST EN ISO 7779:2019
01-marec-2019
1DGRPHãþD
SIST EN ISO 7779:2010
Akustika - Merjenje emisije hrupa informacijskih in telekomunikacijskih naprav
(ISO 7779:2018)
Acoustics - Measurement of airborne noise emitted by information technology and
telecommunications equipment (ISO 7779:2018)
Akustik - Geräuschemissionsmessung an Geräten der Informations- und
Telekommunikationstechnik (ISO 7779:2018)

Acoustique - Mesurage du bruit aérien émis par les équipements liés aux technologies

de l'information et aux télécommunications (ISO 7779:2018)
Ta slovenski standard je istoveten z: EN ISO 7779:2018
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
33.020 Telekomunikacije na splošno Telecommunications in
general
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
SIST EN ISO 7779:2019 en

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

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SIST EN ISO 7779:2019
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SIST EN ISO 7779:2019
EN ISO 7779
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2018
EUROPÄISCHE NORM
ICS 17.140.20; 35.020 Supersedes EN ISO 7779:2010
English Version
Acoustics - Measurement of airborne noise emitted by
information technology and telecommunications
equipment (ISO 7779:2018)

Acoustique - Mesurage du bruit aérien émis par les Akustik - Geräuschemissionsmessung an Geräten der

équipements liés aux technologies de l'information et Informations- und Telekommunikationstechnik (ISO

aux télécommunications (ISO 7779:2018) 7779:2018)
This European Standard was approved by CEN on 26 November 2018.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7779:2018 E

worldwide for CEN national Members.
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SIST EN ISO 7779:2019
EN ISO 7779:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 7779:2019
EN ISO 7779:2018 (E)
European foreword

This document (EN ISO 7779:2018) has been prepared by Technical Committee ISO/TC 43 "Acoustics"

in collaboration with Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by

DIN.

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 June 2019, and conflicting national standards shall be

withdrawn at the latest by June 2019.

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 7779:2010.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 7779:2018 has been approved by CEN as EN ISO 7779:2018 without any modification.

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SIST EN ISO 7779:2019
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SIST EN ISO 7779:2019
INTERNATIONAL ISO
STANDARD 7779
Fourth edition
2018-11
Acoustics — Measurement of airborne
noise emitted by information
technology and telecommunications
equipment
Acoustique — Mesurage du bruit aérien émis par les équipements liés
aux technologies de l'information et aux télécommunications
Reference number
ISO 7779:2018(E)
ISO 2018
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SIST EN ISO 7779:2019
ISO 7779:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 7779:2019
ISO 7779:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................vi

Introduction ............................................................................................................................................................................................................................viii

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

3.1 General definitions .............................................................................................................................................................................. 2

3.2 Acoustical definitions ........................................................................................................................................................................ 4

3.3 Statistical definitions ......................................................................................................................................................................... 7

4 Conformity requirements ........................................................................................................................................................................... 7

5 Installation and operating conditions............................................................................................................................................ 8

5.1 Equipment installation .................................................................................................................................................................... 8

5.1.1 General...................................................................................................................................................................................... 8

5.1.2 Floor-standing equipment ....................................................................................................................................... 8

5.1.3 Table-top equipment .................................................................................................................................................... 9

5.1.4 Wall-mounted equipment ........................................................................................................................................ 9

5.1.5 Rack-mounted equipment ....................................................................................................................................... 9

5.1.6 Hand-held equipment.................................................................................................................................................. 9

5.1.7 Sub-assemblies .................................................................................................................................................................. 9

5.2 Input voltage and frequency ....................................................................................................................................................10

5.3 Equipment operation .....................................................................................................................................................................10

6 Method for determination of sound power levels of equipment in reverberation test

rooms .............................................................................................................................................................................................................................11

6.1 General ........................................................................................................................................................................................................11

6.2 Measurement uncertainty ..........................................................................................................................................................11

6.3 Test environment ...............................................................................................................................................................................12

6.3.1 General...................................................................................................................................................................................12

6.3.2 Meteorological conditions ....................................................................................................................................12

6.4 Instrumentation ..................................................................................................................................................................................12

6.4.1 General...................................................................................................................................................................................12

6.4.2 The microphone and its associated cable ...............................................................................................12

6.4.3 Frequency response of the instrumentation system .....................................................................12

6.4.4 Reference sound source ..........................................................................................................................................13

6.4.5 Filter characteristics ..................................................................................................................................................13

6.4.6 Calibration ..........................................................................................................................................................................13

6.5 Installation and operation of equipment: general requirements .............................................................13

6.6 Microphone positions and source locations ...............................................................................................................13

6.6.1 General...................................................................................................................................................................................13

6.6.2 Number of microphone positions, reference sound source locations and

equipment locations ..................................................................................................................................................14

6.6.3 Microphone arrangement .....................................................................................................................................14

6.7 Measurement of sound pressure level .............................................................................................................................14

6.7.1 General...................................................................................................................................................................................14

6.7.2 Measurement duration ............................................................................................................................................14

6.7.3 Corrections for background noise .................................................................................................................14

6.8 Measurement of the sound pressure level of the reference sound source .......................................14

6.9 Calculation of mean time-averaged band sound pressure level ................................................................14

6.10 Determination of sound power level ................................................................................................................................14

6.10.1 Calculation of band sound power levels ...................................................................................................14

6.10.2 Calculation of A-weighted sound power level .....................................................................................15

7 Method for determination of sound power levels of equipment under essentially

free‑field conditions over a reflecting plane ........................................................................................................................17

7.1 General ........................................................................................................................................................................................................17

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7.2 Measurement uncertainty ..........................................................................................................................................................17

7.3 Test environment ...............................................................................................................................................................................18

7.3.1 Essentially free field over a reflecting plane .........................................................................................18

7.3.2 Meteorological conditions ....................................................................................................................................19

7.4 Instrumentation ..................................................................................................................................................................................20

7.4.1 General...................................................................................................................................................................................20

7.4.2 The microphone and its associated cable ...............................................................................................20

7.4.3 Frequency response of the instrumentation system .....................................................................20

7.4.4 Reference sound source ..........................................................................................................................................20

7.4.5 Filter characteristics ..................................................................................................................................................20

7.4.6 Calibration ..........................................................................................................................................................................20

7.5 Installation and operation of equipment: General requirements ............................................................20

7.6 Measurement surface and microphone positions .................................................................................................21

7.6.1 General...................................................................................................................................................................................21

7.6.2 Microphone positions on the measurement surface .....................................................................22

7.7 Measurement of sound pressure levels ..........................................................................................................................22

7.7.1 General...................................................................................................................................................................................22

7.7.2 Measurement duration ............................................................................................................................................22

7.7.3 Corrections for background noise .................................................................................................................22

7.8 Calculation of surface sound pressure level ...............................................................................................................22

7.9 Determination of sound power levels ..............................................................................................................................23

7.9.1 Calculation of band sound power levels ...................................................................................................23

7.9.2 Calculation of A-weighted sound power level .....................................................................................23

8 Method for determination of emission sound pressure levels at defined operator

and bystander positions ............................................................................................................................................................................23

8.1 General ........................................................................................................................................................................................................23

8.2 Measurement uncertainty ..........................................................................................................................................................24

8.3 Test environment ...............................................................................................................................................................................24

8.3.1 General...................................................................................................................................................................................24

8.3.2 Meteorological conditions ....................................................................................................................................24

8.4 Instrumentation ..................................................................................................................................................................................25

8.5 Installation and operation of equipment ......................................................................................................................25

8.6 Microphone positions ....................................................................................................................................................................25

8.6.1 General...................................................................................................................................................................................25

8.6.2 At the operator position(s) ..................................................................................................................................25

8.6.3 At the bystander positions ...................................................................................................................................28

8.6.4 Microphone orientation ..........................................................................................................................................28

8.7 Measurement of sound pressure levels ..........................................................................................................................28

8.7.1 General...................................................................................................................................................................................28

8.7.2 Measurement duration ............................................................................................................................................29

8.7.3 Corrections for background noise .................................................................................................................29

8.8 Determination of emission sound pressure levels ................................................................................................29

8.8.1 Calculation of band emission sound pressure levels .....................................................................29

8.8.2 Calculation of A-weighted emission sound pressure levels from band levels .........29

8.8.3 Calculation of the mean emission sound pressure level at the bystander

positions ...............................................................................................................................................................................30

9 Measurement uncertainty .......................................................................................................................................................................30

10 Information to be recorded and reported ..............................................................................................................................32

10.1 Information to be recorded .......................................................................................................................................................32

10.1.1 General...................................................................................................................................................................................32

10.1.2 Equipment under test ...............................................................................................................................................32

10.1.3 Acoustical environment ..........................................................................................................................................32

10.1.4 Instrumentation ............................................................................................................................................................33

10.1.5 Acoustical data ................................................................................................................................................................34

10.2 Test report ................................................................................................................................................................................................35

Annex A (normative) Test accessories .............................................................................................................................................................37

iv © ISO 2018 – All rights reserved
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Annex B (normative) Measurement surfaces ...........................................................................................................................................40

Annex C (normative) Installation and operating conditions for specific equipment categories .......46

Annex D (informative) Identification and evaluation of prominent discrete tones .........................................47

Annex E (informative) Background information on the method formerly used for the

detection of impulsive noise..................................................................................................................................................................67

Bibliography .............................................................................................................................................................................................................................68

© ISO 2018 – All rights reserved v
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SIST EN ISO 7779:2019
ISO 7779:2018(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 on 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 the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.

This fourth edition cancels and replaces the third edition (ISO 7779:2010), which has been technically

revised. The main changes compared to the previous edition are as follows:
— Clause 3:

— Updates of many items in 3.1 and 3.2 to be consistent with basic standards, such as ISO/TR

25417, ISO 3744, etc.
— Addition of new 3.3 corresponding to new Clause 9.
— Clause 6:

— In 6.4.6, the microphone calibration procedures were amended to be consistent with those of

industrial counterpart, ECMA-74.
— Clause 7:

— In 7.3 (7.3.1), the procedure for test environment qualification was amended to clarify that

any frequency bands, typically low in frequency, not significantly affecting A-weighted sound

power level need not meet the hemi-anechoic room qualification criteria for the purposes of

determining A-weighted sound power level.
vi © ISO 2018 – All rights reserved
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SIST EN ISO 7779:2019
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— In 7.4.6, the microphone calibration procedures were amended to be consistent with those of

industrial counterpart, ECMA-74.
— Clause 8:

— In 8.6, new 8.6.1 was inserted to clarify the method of defining operator position and bystander

positions.
— Clause 9:
— Clause 9 was newly inserted.

— In relation to Clause 9, 3.3 was also added, and the descriptions of Tables 1, 5 and 6 (in 6.2, 7.2

and 8.2 respectively) were amended.
— Annex B:

— B.2.2 and B.2.3 were amended to clarify the section of size and microphone positions on the

cylindrical measurement surface, respectively.
— Annex D:
— In D.1, D.8, D.9.5, D.10.3 and D.10.4,
...

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