Acoustics - Measurement of airborne noise emitted by information technology and telecommunications equipment (ISO 7779:2010)

ISO 7779:2010 specifies procedures for measuring and reporting the noise emission of information technology and telecommunications equipment.
The basic emission quantity is the A-weighted sound power level which may 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 ISO 7779:2010 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 one of these three basic noise emission standards can be selected and used exclusively in accordance with ISO 7779:2010 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(s) or the bystander positions, based on basic noise emission standard ISO 11201. This sound pressure level is not a worker's immission rating level, 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 or is impulsive in character are specified in annexes.
ISO 7779:2010 is suitable for type tests and provides methods for manufacturers and testing laboratories to obtain comparable results.
The methods specified in ISO 7779:2010 allow the determination of noise emission levels for a functional unit tested individually.
The procedures apply to equipment which emits broadband noise, narrowband 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).
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).

Akustik - Geräuschemissionsmessung an Geräten der Informations- und Telekommunikationstechnik (ISO 7779:2010)

Diese Internationale Norm legt Verfahren zur Messung und Angabe des Geräusches fest, das von Geräten der
Informations- und Telekommunikationstechnik abgestrahlt wird.
ANMERKUNG 1 Diese Internationale Norm gilt als Teil einer Geräuschmessnorm (siehe 3.1.2) für diese Art von
Geräten. Sie beruht auf den Geräuschemissions-Grundnormen (siehe 3.1.1) ISO 3741, ISO 3744, ISO 3745 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 dieser Internationalen Norm werden drei Geräuschemissions-Grundnormen zur Bestimmung der Schallleistungspegel
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 dieser
Internationalen Norm für die Bestimmung der Schallleistungspegel einer Maschine angewandt werden.
Der A-bewertete Schallleistungspegel wird durch den A-bewerteten Emissions-Schalldruckpegel am Arbeitsplatz
(an Arbeitsplätzen) oder an Nachbararbeitsplätzen eines Gerätes ergänzt, die nach der Geräuschemissions-
Grundnorm ISO 11201 bestimmt werden. Letzterer ist zwar kein Beurteilungspegel der Geräuschbelastung
eines am Gerät Arbeitenden (Geräuschimmission), er kann aber bei der Suche nach möglichen Problemen
helfen, die zu einer Belästigung, Arbeitsbehinderung oder zu Hörschäden bei Bedienungspersonen oder an
Nachbararbeitsplätzen führen könnten.
In den Anhängen D und E sind Verfahren festgelegt, nach denen bestimmt werden kann, ob die Geräuschemission
deutliche Einzeltöne oder Impulsanteile enthält.

Acoustique - Mesurage du bruit aérien émis par les équipements liés aux technologies de l'information et aux télécommunications (ISO 7779:2010)

L'ISO 7779:2010 spécifie des procédures de mesurage et d'indication de l'émission sonore des équipements liés aux technologies de l'information et aux télécommunications.
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 l'ISO 7779:2010 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 peut être sélectionnée et utilisée exclusivement conformément à l'ISO 779:2010 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 (aux) position(s) 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 d'évaluation d'immission du travailleur, 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 émergentes, ou si elle présente un caractère impulsionnel, sont spécifiées dans les Annexes D et E, respectivement.
L'ISO 7779:2010 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 l'ISO 7779:2010 permettent la détermination de niveaux d'émission sonore pour une unité fonctionnelle testée individuellement.
Les procédures sont applicables à l'équipement qui émet un bruit à large bande, un bruit à bande étroite, un bruit à composantes tonales, 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 ISO 9296).
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).

Akustika - Merjenje zračnega hrupa informacijske tehnologije in telekomunikacijske opreme (ISO 7779:2010)

Ta mednarodni standard določa postopke za merjenje in poročanje o emisijah hrupa informacijske tehnologije in telekomunikacijske opreme. Osnovna količina emisij je A-utežena raven moči zvoka, ki se lahko uporablja za primerjavo opreme istega tipa, vendar od različnih proizvajalcev, ali za primerjavo različne opreme. V tem mednarodnem standardu so določeni trije osnovni standardi emisij hrupa za ugotavljanje ravni moči zvoka, z namenom izogniti se nepotrebnim omejitvam obstoječih možnosti in izkušenj. ISO 3741 določa ukrepe za primerjavo v odmevnicah; ISO 3744 in ISO 3745 določata ukrepe na v osnovi prostem polju nad odbojno ravnino. Kateri koli izmed teh treh osnovnih standardov za emisije hrupa se lahko izbere in uporabi izključno v skladu s tem mednarodnim standardom, kadar se ugotavljajo ravni moči zvoka stroja. A-utežena raven moči zvoka je nadomeščena z A-uteženo ravnijo emisij zvočnega tlaka, ugotovljeno s strani operaterjev ali drugih navzočih oseb, osnovano na osnovnem standardu o emisijah hrupa ISO 11201. Ta raven zvočnega tlaka ni delavčeva ocenjena raven emisije, vendar lahko pomaga pri prepoznavanju kakršnih koli potencialnih problemov, ki bi lahko povzročili nevšečnosti, motenje dejavnosti ali poškodbo sluha za operaterje ali druge navzoče osebe. Metode za ugotavljanje ali emisije hrupa vključujejo izrazito diskretne tone in ali so nenadne so opredeljene v Dodatkih D in E v tem vrstnem redu. Ta mednarodni standard je primeren za tipska preskušanja in predpisuje metode za proizvajalce in preskusne laboratorije, s katerimi se pridobijo primerljivi rezultati. Metoda, opredeljena v tem mednarodnem standardu, omogoča ugotavljanje ravni emisij hrupa za funkcionalno enoto (glej točko 3.1.4.), ki se preskuša posamično. Postopki veljajo za opremo, ki oddaja širokopasovni hrup, ozkopasovni hrup in hrup, ki vsebuje komponente diskretnih frekvenc ali nenadni hrup. Pridobljene ravni moči zvoka in emisije zvočnega tlaka lahko služijo za namene deklariranja emisij in primerjanja (glej ISO 9296). Če so pridobljene ravni moči zvoka določene za več funkcionalnih enot iste proizvodne serije, se lahko uporabijo za določevanje statistične vrednosti te proizvodne serije (glej ISO 9296).

General Information

Status
Withdrawn
Publication Date
14-Aug-2010
Withdrawal Date
11-Dec-2018
Technical Committee
Drafting Committee
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
12-Dec-2018

RELATIONS

Buy Standard

Standard
EN ISO 7779:2010
English language
70 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 7779:2010
01-december-2010
1DGRPHãþD
SIST EN ISO 7779:2002
SIST EN ISO 7779:2002/A1:2004
SIST EN ISO 7779:2002/oprA2:2006
$NXVWLND0HUMHQMH]UDþQHJDKUXSDLQIRUPDFLMVNHWHKQRORJLMHLQ
WHOHNRPXQLNDFLMVNHRSUHPH ,62
Acoustics - Measurement of airborne noise emitted by information technology and
telecommunications equipment (ISO 7779:2010)
Akustik - Geräuschemissionsmessung an Geräten der Informations- und
Telekommunikationstechnik (ISO 7779:2010)

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

de l'information et aux télécommunications (ISO 7779:2010)
Ta slovenski standard je istoveten z: EN ISO 7779:2010
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
SIST EN ISO 7779:2010 en

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

---------------------- Page: 1 ----------------------
SIST EN ISO 7779:2010
---------------------- Page: 2 ----------------------
SIST EN ISO 7779:2010
EUROPEAN STANDARD
EN ISO 7779
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2010
ICS 17.140.20; 35.020 Supersedes EN ISO 7779:2001
English Version
Acoustics - Measurement of airborne noise emitted by
information technology and telecommunications equipment (ISO
7779:2010)

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

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

télécommunications (ISO 7779:2010) 7779:2010)
This European Standard was approved by CEN on 26 July 2010.

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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7779:2010: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 7779:2010
EN ISO 7779:2010 (E)
Contents Page

Foreword ..............................................................................................................................................................3

---------------------- Page: 4 ----------------------
SIST EN ISO 7779:2010
EN ISO 7779:2010 (E)
Foreword

This document (EN ISO 7779:2010) 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 DS.

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 2010, and conflicting national standards shall be withdrawn

at the latest by February 2010.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 7779:2001.

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, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
Endorsement notice

The text of ISO 7779:2010 has been approved by CEN as a EN ISO 7779:2010 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 7779:2010
---------------------- Page: 6 ----------------------
SIST EN ISO 7779:2010
INTERNATIONAL ISO
STANDARD 7779
Third edition
2010-08-15
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 7779:2010(E)
ISO 2010
---------------------- Page: 7 ----------------------
SIST EN ISO 7779:2010
ISO 7779:2010(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

COPYRIGHT PROTECTED DOCUMENT
© ISO 2010

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2010 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 7779:2010
ISO 7779:2010(E)
Contents Page

Foreword ............................................................................................................................................................iv

Introduction.........................................................................................................................................................v

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

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

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

4 Conformity requirements......................................................................................................................6

5 Installation and operating conditions .................................................................................................6

6 Method for determination of sound power levels of equipment in reverberation test rooms ......9

7 Method for determination of sound power levels of equipment under essentially free-field

conditions over a reflecting plane .....................................................................................................15

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

bystander positions ............................................................................................................................20

9 Information to be recorded and reported..........................................................................................27

Annex A (normative) Test accessories...........................................................................................................32

Annex B (normative) Measurement surfaces.................................................................................................35

Annex C (normative) Installation and operating conditions for specific equipment categories..............40

Annex D (informative) Identification and evaluation of prominent discrete tones ....................................41

Annex E (informative) Detection of impulsive noise .....................................................................................59

Bibliography......................................................................................................................................................61

© ISO 2010 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 7779:2010
ISO 7779:2010(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 7779 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.

This third edition cancels and replaces the second edition (ISO 7779:1999), which has been technically

revised. It also incorporates the amendment, ISO 7779:1999/Amd.1:2003.
iv © ISO 2010 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 7779:2010
ISO 7779:2010(E)
Introduction

This International Standard specifies methods for the measurement of airborne noise emitted by information

technology and telecommunications (ITT) equipment. Hitherto, a wide variety of methods have been applied

by individual manufacturers and users to satisfy particular equipment or application needs. These diverse

practices have, in many cases, made comparison of noise emission difficult. This International Standard

simplifies such comparisons and is the basis for the declaration of the noise emission levels of ITT equipment.

In order to ensure accuracy, validity and acceptability, this International Standard is based on the basic

International Standards for determination of the sound power level and for determination of the emission

sound pressure level at the operator position(s) and bystander position(s). Furthermore, implementation is

simplified by conformity with these International Standards.

In many cases, free-field conditions over a reflecting plane are realised by hemi-anechoic rooms. These

rooms may be particularly useful during product design to locate and to improve individual contributing noise

sources. Reverberation rooms may be more economical for production control and for obtaining sound power

levels for noise emission declaration purposes.

The method for measuring the emission sound pressure level at the operator or bystander positions (based on

ISO 11201) is specified in a separate clause, as this level is not considered to be primary noise emission

declaration information. The measurements can, however, be carried out in conjunction with those for sound

power determination in a free field over a reflecting plane.

For comparison of similar equipment, it is essential that the installation conditions and mode of operation be

the same. In Annex C these parameters are standardized for many categories of equipment.

This International Standard is based on ECMA-74.
© ISO 2010 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 7779:2010
---------------------- Page: 12 ----------------------
SIST EN ISO 7779:2010
INTERNATIONAL STANDARD ISO 7779:2010(E)
Acoustics — Measurement of airborne noise emitted by
information technology and telecommunications equipment
1 Scope

This International Standard specifies procedures for measuring and reporting the noise emission of

information technology and telecommunications equipment.

NOTE 1 This International Standard 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 and ISO 11201.

The basic emission quantity is the A-weighted sound power level which may 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

International Standard 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 one of these three basic noise emission

standards can be selected and used exclusively in accordance with this International Standard 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(s) or the bystander positions, based on basic noise emission standard

ISO 11201. This sound pressure level is not a worker's immission rating level, 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 or is impulsive in

character are specified in Annexes D and E, respectively.

This International Standard is suitable for type tests and provides methods for manufacturers and testing

laboratories to obtain comparable results.

The methods specified in this International Standard 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).

NOTE 2 The sound power and emission sound pressure levels obtained are not to be considered as installation noise

[4]

immission levels; however, they can be used for installation planning (see ECMA TR/27 ).

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).

© ISO 2010 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 7779:2010
ISO 7779:2010(E)
2 Normative references

The following referenced documents are indispensable for the application 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 266, Acoustics — Preferred frequencies

ISO 3741, Acoustics — Determination of sound power levels and sound energy levels of noise sources using

sound pressure — Precision methods for reverberation test rooms

ISO 3744, Acoustics — Determination of sound power levels and sound energy levels of noise sources using

sound pressure — Engineering methods for an essentially free field over a reflecting plane

ISO 3745, Acoustics — Determination of sound power levels and sound energy levels of noise sources using

sound pressure — Precision methods for anechoic test rooms and hemi-anechoic test rooms

ISO 6926, Acoustics — Requirements for the performance and calibration of reference sound sources used

for the determination of sound power levels

ISO 9295, Acoustics — Measurement of high-frequency noise emitted by computer and business equipment

ISO 9296, Acoustics — Declared noise emission values of computer and business equipment

ISO 11201, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound

pressure levels at a work station and at other specified positions in an essentially free field over a reflecting

plane with negligible environmental corrections

ISO 11203, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound

pressure levels at a work station and at other specified positions from the sound power level

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

ECMA-74, Measurement of airborne noise emitted by information technology and telecommunications

equipment
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 3744, ISO 11201, and the following

apply.
3.1 General definitions
3.1.1
basic noise emission standard
B-type standard

standard which specifies the procedure for determining the noise emission of machinery and equipment in

such a way as to obtain reliable, reproducible results with a specified degree of accuracy

[2]
[ISO 12001:1996 , 3.1]

1) Available [viewed 2010-07-13] at: http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-74.pdf

2 © ISO 2010 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 7779:2010
ISO 7779:2010(E)
3.1.2
noise test code
C-type standard

standard that is applicable to a particular class, family or type of machinery or equipment, which specifies all

the information necessary to carry out efficiently the determination, declaration and verification of the noise

emission characteristics under standardized conditions
[2]
[ISO 12001:1996 , 3.2]

NOTE This International Standard, together with ISO 9295 and ISO 9296, comprise the noise test code for ITT

equipment.
3.1.3
information technology and telecommunications equipment
ITT equipment

equipment for information processing, and components thereof, used in homes, offices, server installations,

telecommunications installations or similar environments
3.1.4
functional unit

unit of information technology and telecommunications equipment, either with or without its own end-use

enclosure, that is tested or intended to be tested in accordance with the procedures of this International

Standard

NOTE 1 A functional unit can comprise more than one unit of ITT equipment when such units are to be tested together

in accordance with the methods of this International Standard. A functional unit can also comprise one or more units of ITT

equipment coupled to one or more units of non-ITT equipment, such as power modules, water pumps, or refrigeration

units, when such equipment is necessary for the normal operation of the ITT equipment.

NOTE 2 Functional units of ITT equipment can take on a wide range of forms, including commercially available

products, prototype units under development or sub-assemblies and components thereof.

3.1.5
work station
operator position

position in the vicinity of the equipment under test which is intended for the operator

NOTE 1 Adapted from ISO 11201:2010, 3.11.

NOTE 2 This term does not refer to a computer “workstation”, which denotes a high-performance, single-user computer.

3.1.6
operating mode

condition in which the equipment under test is performing its intended function(s)

3.1.7
idle mode

one or more steady-state conditions in which the equipment being tested is energized but is not operating

3.1.8
floor-standing equipment
functional unit which is intended to be installed on the floor
3.1.9
table-top equipment

functional unit which has a complete enclosure and which is intended to be installed or used on a table, desk

or separate stand
3.1.10
wall-mounted equipment

functional unit which is normally mounted against or in a wall and which does not have a stand of its own

© ISO 2010 – All rights reserved 3
---------------------- Page: 15 ----------------------
SIST EN ISO 7779:2010
ISO 7779:2010(E)
3.1.11
sub-assembly

functional unit, generally without its own end-use enclosure, intended to be installed in another unit of ITT

equipment or assembled together with other sub-assemblies or units of ITT equipment into a single end-use

enclosure
3.1.12
rack-mountable unit

functional unit that is designed to be installed in an end-use enclosure, in the form of a rack, frame, or cabinet,

which can be fully enclosed, partially enclosed, or open frame
3.1.13
rack-enclosed system

functional unit in the form of a rack, frame, or cabinet containing one or more rack-mountable units

NOTE Rack-enclosed systems represent a wide variety of ITT equipment, depending on the particular configuration of

the rack-mountable units in the rack or enclosure. These may be server systems, storage systems, I/O systems,

networking systems or “integrated” systems of these or other types of rack-mountable units.

3.1.14
hand-held equipment

functional unit, generally small and lightweight, intended to be supported by the hand(s) during normal use

3.1.15
standard test table

rigid table having a top surface of at least 0,5 m and length of the top plane not less than 700 mm

NOTE The design for the standard test table is shown in Annex A.
3.2 Acoustical definitions
3.2.1
emission
noise emission

airborne sound radiated by a well-defined noise source (e.g. the equipment under test)

NOTE Noise emission descriptors can be incorporated into a product declaration and/or product specification. The

basic noise emission descriptors are the sound power level of the source itself and the emission sound pressure levels at

an operator position or at bystander positions (if no operator position is defined) in the vicinity of the source.

3.2.2
sound pressure
difference between instantaneous total pressure and static pressure
NOTE 1 Sound pressure is expressed in pascals.

NOTE 2 The symbol p is often used without modification to represent a root mean square (r.m.s.) sound pressure.

[3]
[ISO 80000-8:2007 , 9.2]
4 © ISO 2010 – All rights reserved
---------------------- Page: 16 ----------------------
SIST EN ISO 7779:2010
ISO 7779:2010(E)
3.2.3
sound pressure level

ten times the logarithm to the base 10 of the ratio of the square of the sound pressure, p, to the square of a

reference value, p0, expressed in decibels
L = 10lg dB
where the reference value, p , is 20 µPa
[3]
NOTE This definition is technically in accordance with ISO 80000-8:2007 , 8.22.
[22]
[ISO/TR 25417:2007 , 2.2]
3.2.4
time-averaged sound pressure level

sound pressure level of a continuous steady sound that, within a measurement time interval, T, has the same

mean-square sound pressure as a sound under consideration which varies with time
3.2.5
emission sound pressure level

sound pressure level measured at a specified position near a noise source, when the source is in operation

under specified operating and mounting conditions on a reflecting plane surface, but excluding the effects of

background noise
NOTE 1 The emission sound pressure level is expressed in decibels.

NOTE 2 Clause 8 specifies the method for determination of emission sound pressure level.

3.2.6
time-averaged emission sound pressure level
peqT

emission sound pressure level of a continuous steady sound that, within a measurement time interval, T, has

the same mean-square sound pressure as a sound under consideration which varies with time

⎡⎤1
pt dt
T 0
L = 10 lg dB
pTeq
⎢⎥p
NOTE 1 The time-averaged emission sound pressure level is expressed in decibels.

NOTE 2 The emission sound pressure level is determined at the specified position(s) required by the noise test code

(i.e. this International Standard, for specific families of ITT equipment).

NOTE 3 In general, the subscripts “eq” and “T ” are omitted since time-averaged emission sound pressure levels are

necessarily determined over a certain measurement time interval.
3.2.7
A-weighted impulse sound pressure level
pAI

A-weighted sound pressure level determined with a sound level meter set for the I time-weighting

characteristic (impulse)
NOTE The A-weighted impulse sound pressure level is expressed in decibels.
© ISO 2010 – All rights reserved 5
---------------------- Page: 17 ----------------------
SIST EN ISO 7779:2010
ISO 7779:2010(E)
3.2.8
C-weighted peak sound pressure level
pCpeak

highest instantaneous value of the C-weighted sound pressure level determined over an operational cycle

NOTE The C-weighted peak sound pressure level is expressed in decibels.
3.2.9
sound power
rate per time at which airborne sound energy is radiated by a source
NOTE 1 Sound power is expressed in watts.

NOTE 2 In this International Standard, it is the time-averaged value of the sound power during the measurement

duration.
3.2.10
reference sound source

device which is intended for use as a stable source of sound, which has a known broad-band sound power

spectrum calibrated in accordance with ISO 6926 over the frequency range of interest

3.2.11
frequency range of interest

one-third-octave bands with centre frequencies specified in ISO 266 from 100 Hz to 10 000 Hz inclusive

NOTE For equipment which emits discrete tone(s) in the 16 kHz octave band, the procedures specified in ISO 9295

are used; see Table 4.
4 Conformity requirements

Measurements are in conformity with this International Standard if they meet the following requirements:

a) the measurement procedures, the installation and the operating conditions specified in this International

Standard are fully taken into account;

b) for the determination of sound power levels, one (and only one) of the methods specified in Clause 6 or 7

is used;

c) for determination of emission sound pressure level at the operator or bystander positions, the method

specified in Clause 8 is used.
5 Installation and operating conditions
5.1 Equipment installation
5.1.1 General

The equipment shall be installed according to its intended use. Installation conditions for many different

categories of ITT equipment are specified in Annex C; these shall be followed when noise emission

declaration information is to be obtained. If the normal installation is unknown or if several possibilities exist, a

representative condition shall be chosen and reported.

Care shall be taken to ensure that any electrical conduits, piping, air ducts or other auxiliary equipment

connected to the equipment being tested do not radiate significant amounts of sound energy into the test room.

If practicable, all auxiliary equipment necessary for the operation of the equipment shall be located outside the

test room and the test room shall be free from all objects which may interfere with the measurements.

6 © ISO 2010 – All rights reserved
---------------------- Page: 18 ----------------------
SIST EN ISO 7779:2010
ISO 7779:2010(E)

NOTE If the equipment is mounted near one or more reflecting planes, the sound power radiated by the equipment

can depend upon its position and orientation. It is possible that the determination of the radiated sound power is of interest

either for one particular equipment position and orientation or from the average value for several positions and orientations.

5.1.2 Floor-standing equipment
5.1.2.1 Requirements for reverberation test rooms

Floor-standing equipment shall be located at least 1,5 m from any wall of the room and no major surfaces

shall be parallel to a wall of the reverberation test room.
5.1.2.2 Requirements for hemi-anechoic rooms

Floor-standing equipment shall be installed on the reflecting (hard) floor at a sufficient distance (more than

2 m, if possible) from the walls, unless otherwise specified in Annex C.
The equipment shall be installed in a way which
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.