EN ISO 9295:2015

Acoustics - Determination of high-frequency sound power levels emitted by machinery and equipment (ISO 9295:2015)

ISO 9295:2015 specifies four methods for the determination of the sound power levels of high-frequency noise emitted by machinery and equipment in the frequency range covered by the octave band centred at 16 kHz, which includes frequencies between 11,2 kHz and 22,4 kHz. They are complementary to the methods described in ISO 3741 and ISO 3744. The first three methods are based on the reverberation test room technique. The fourth method makes use of a free field over a reflecting plane.
The test conditions which prescribe the installation and operation of the equipment are those specified in ISO 3741 or ISO 3744 as applicable.

Akustik - Bestimmung der hochfrequenten Schallleistungspegel von Maschinen und Geräten (ISO 9295:2015)

Diese Internationale Norm legt vier Verfahren zur Bestimmung der Schallleistungspegel von hochfrequenten Geräuschen fest, die von Maschinen und Geräten im durch das Oktavband mit der Mittenfrequenz von 16 kHz abgedeckten Frequenzbereich abgestrahlt werden, welches die Frequenzen zwischen 11,2 kHz und 22,4 kHz umfasst. Sie ergänzen die in ISO 3741 und ISO 3744 enthaltenen Verfahren. Die ersten drei Verfahren beruhen auf dem Hallraumverfahren. Das vierte Verfahren nutzt ein Freifeld über einer reflektierenden Ebene.
Die Prüfbedingungen, die die Aufstellung und den Betrieb der Geräte festlegen, sind je nach Zutreffen in ISO 3741 oder ISO 3744 festgelegt.

Acoustique - Détermination des niveaux de puissance acoustique à haute fréquence émis par les machines et équipements (ISO 9295:2015)

ISO 9295:2015 spécifie quatre méthodes pour la détermination des niveaux de puissance acoustique du bruit à haute fréquence émis par les machines et équipements dans le domaine de fréquences couvert par la bande d'octave centrée sur 16 kHz, qui inclut les fréquences comprises entre 11,2 kHz et 22,4 kHz. Ces méthodes sont complémentaires aux méthodes décrites dans l'ISO 3741 et l'ISO 3744. Les trois premières méthodes reposent sur la technique en salle d'essai réverbérante. La quatrième méthode fait appel à un champ libre au-dessus d'un plan réfléchissant.
Les conditions d'essai qui déterminent l'installation et le fonctionnement des équipements sont celles spécifiées dans l'ISO 3741 ou l'ISO 3744, selon le cas.

Akustika - Določanje visokofrekvenčnih ravni zvočne moči naprav in opreme (ISO 9295:2015)

Ta mednarodni standard določa štiri metode za določanje visokofrekvenčnih ravni zvočne moči
naprav in opreme v frekvenčnem razponu, ki zajema oktavni pas s srednjo frekvenco 16 kHz, kar vključuje frekvence med 11,2 kHz in 22,4 kHz. Te metode dopolnjujejo metode, opisane v standardih ISO 3741 in ISO 3744. Prve tri metode temeljijo na tehniki odmeva v preskusnem prostoru. Pri četrti metodi se uporablja prosto polje nad odbojno ravnino. Preskusni pogoji, predpisani za namestitev in delovanje opreme, so opredeljeni v standardu ISO 3741 ali ISO 3744, kot je primerno.

General Information

• Status: Published
• Publication Date: 19-May-2015
• Withdrawal Date: 29-Nov-2015
• ICS: 17.140.20 - Noise emitted by machines and equipment
• ICS: 35.020 - Information technology (IT) in general
• ICS: 35.160 - Microprocessor systems
• ICS: 35.180 - IT Terminal and other peripheral equipment
• ICS: 35.260 - Office machines
• Technical Committee: CEN/TC 211 - Acuostics
• Drafting Committee: CEN/TC 211 - Acuostics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 20-May-2015
• Completion Date: 20-May-2015
• Ref Project: SIST EN ISO 9295:2015 - Acoustics - Determination of high-frequency sound power levels emitted by machinery and equipment (ISO 9295:2015)

Relations

• Replaces: EN 29295:1991 - Acoustics - Measurement of high-frequency noise emitted by computer and business equipment (ISO 9295:1988)
• Effective Date: 26-May-2015

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2015
1DGRPHãþD
SIST EN 29295:1999
$NXVWLND'RORþDQMHYLVRNRIUHNYHQþQLKUDYQL]YRþQHPRþLQDSUDYLQRSUHPH,62

Acoustics - Determination of high-frequency sound power levels emitted by machinery
and equipment (ISO 9295:2015)
Akustik - Bestimmung der hochfrequenten Schallleistungspegel von Maschinen und
Geräten (ISO 9295:2015)
Acoustique - Détermination des niveaux de puissance à haute fréquence émis par les
machines et équipements (ISO 9295:2015)
Ta slovenski standard je istoveten z: EN ISO 9295:2015
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 9295
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2015
ICS 17.140.20; 35.020 Supersedes EN 29295:1991
English Version
Acoustics - Determination of high-frequency sound power levels
emitted by machinery and equipment (ISO 9295:2015)
Acoustique - Détermination des niveaux de puissance Akustik - Bestimmung der hochfrequenten
acoustique à haute fréquence émis par les machines et Schallleistungspegel von Maschinen und Geräten (ISO
équipements (ISO 9295:2015) 9295:2015)
This European Standard was approved by CEN on 21 February 2015.

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, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9295:2015 E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 9295:2015) 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 November 2015, and conflicting national standards shall be withdrawn
at the latest by November 2015.
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 29295:1991.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 9295:2015 has been approved by CEN as EN ISO 9295:2015 without any modification.
INTERNATIONAL ISO
STANDARD 9295
Second edition
2015-05-15
Acoustics — Determination of high-
frequency sound power levels emitted
by machinery and equipment
Acoustique — Détermination des niveaux de puissance acoustique à
haute fréquence émis par les machines et équipements
Reference number
ISO 9295:2015(E)
©
ISO 2015
ISO 9295:2015(E)
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
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ii © ISO 2015 – All rights reserved

ISO 9295:2015(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Conformity requirements . 1
5 Requirements for measurements in a reverberation test room . 1
5.1 General . 1
5.2 Meteorological conditions . 2
5.3 Instrumentation . 2
5.4 Installation and orientation of microphone . 2
5.5 Installation and orientation of equipment . 3
5.6 Calibration of measurement system . 3
5.7 Measurement of sound pressure level . 3
6 Method using measured reverberation time . 4
6.1 General . 4
6.2 Measurement of reverberation time . 5
6.3 Calculation of room absorption . 5
6.4 Installation of microphone and equipment . 5
6.5 Measurement of sound pressure level . 5
6.6 Calculation of sound power level . 6
7 Method using calculated air absorption . 6
7.1 General . 6
7.2 Calculation of room constant . 6
7.3 Installation of microphone and equipment . 6
7.4 Measurement of sound pressure level . 6
7.5 Calculation of sound power level . 7
8 Method using a reference sound source . 8
8.1 Reference sound source . 8
8.2 Installation of microphone and equipment . 8
8.3 Installation of reference sound source . 9
8.4 Measurement of sound pressure level . 9
8.5 Calculation of sound power level . 9
8.5.1 Equipment emitting broad-band noise . 9
8.5.2 Equipment emitting discrete tone(s) .10
9 Method using a free field over a reflecting plane .10
9.1 General .10
9.2 Meteorological conditions .10
9.3 Instrumentation .11
9.4 Installation and orientation of microphone .11
9.5 Installation of equipment .11
9.6 Calibration of measurement system .11
9.7 Measurement of sound pressure level .12
9.8 Calculation of surface sound pressure level and sound power level .12
10 Calculation of sound power level under reference meteorological conditions .13
10.1 Reverberation rooms .13
10.2 Hemi-anechoic rooms .13
11 Measurement uncertainty .13
12 Information to be recorded .
...