EN ISO 5135:1998
(Main)Acoustics - Determination of sound power levels of noise from air-terminal devices, air-terminal units, dampers and valves by measurement in a reverberation room (ISO 5135:1997)
Acoustics - Determination of sound power levels of noise from air-terminal devices, air-terminal units, dampers and valves by measurement in a reverberation room (ISO 5135:1997)
Akustik - Bestimmung des Schalleistungspegels von Geräuschen von Luftdurchlässen, Volumenstromreglern, Drossel- und Absperrelementen durch Messungen im Hallraum (ISO 5135:1997)
Diese Internationale Norm stellt allgemeine Regeln für die akustische Prüfung von Luftdurchlässen, Drossel- und Absperrelementen auf, die in Luftdiffusions- und Verteilungssystemen nach ISO 3258 verwendet werden. Diese dienen der Ermittlung der Schalleistungspegel nach ISO 3740.
Acoustique - Détermination des niveaux de puissance acoustique du bruit émis par les bouches d'air, les unités terminales, les registres et clapets au moyen de mesurages en salle réverbérante (ISO 5135:1997)
Akustika – Ugotavljanje ravni zvočnih moči virov hrupa z meritvami v odmevnici za zračne izpuste ter dušilne in zaporne elemente za zrak (ISO 5135:1997)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-1999
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Acoustics - Determination of sound power levels of noise from air-terminal devices, air-
terminal units, dampers and valves by measurement in a reverberation room (ISO
5135:1997)
Akustik - Bestimmung des Schalleistungspegels von Geräuschen von Luftdurchlässen,
Volumenstromreglern, Drossel- und Absperrelementen durch Messungen im Hallraum
(ISO 5135:1997)
Acoustique - Détermination des niveaux de puissance acoustique du bruit émis par les
bouches d'air, les unités terminales, les registres et clapets au moyen de mesurages en
salle réverbérante (ISO 5135:1997)
Ta slovenski standard je istoveten z: EN ISO 5135:1998
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
91.120.20 $NXVWLNDYVWDYEDK=YRþQD Acoustics in building. Sound
L]RODFLMD insulation
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 5135
Second edition
1997-12-15
Acoustics — Determination of sound power
levels of noise from air-terminal devices,
air-terminal units, dampers and valves by
measurement in a reverberation room
Acoustique — Détermination des niveaux de puissance acoustique du bruit
émis par les bouches d'air, les unités terminales, les registres et clapets au
moyen de mesurages en salle reverbérante
A
Reference number
ISO 5135:1997(E)
ISO 5135:1997(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.
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.
International Standard ISO 5135 was prepared by ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
This second edition cancels and replaces the first edition (ISO 5135:1984), of which it constitutes a technical
revision.
Annex A of this International Standard is for information only.
© ISO 1997
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 the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet central@iso.ch
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii
© ISO
ISO 5135:1997(E)
Introduction
This International Standard defines requirements for acoustic testing in reverberation rooms of the type of
equipment listed in clause 1. It is based on the use of ISO 3741, which describes the acoustic test facilities,
instrumentation and procedures to be used for precision grade determination of sound power levels in octave or
one-third-octave bands of a noise source.
iii
INTERNATIONAL STANDARD © ISO ISO 5135:1997(E)
Acoustics — Determination of sound power levels of noise from
air-terminal devices, air-terminal units, dampers and valves by
measurement in a reverberation room
1 Scope
This International Standard establishes general rules for the acoustic testing of air-terminal units, dampers and
valves used in air diffusion and air distribution systems as defined in ISO 3258 in order to determine sound power
levels as defined in ISO 3740.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 3258:1976, Air distribution and air diffusion — Vocabulary.
ISO 3740:1980, Acoustics — Determination of sound power levels of noise sources — Guidelines for the use of
basic standards and for the preparation of noise test codes.
1)
ISO 3741:— , Acoustics — Determination of sound power levels of noise sources using sound pressure —
Precision methods for reverberation rooms.
ISO 5219:1984,
Air distribution and air diffusion — Laboratory aerodynamic testing and rating of air terminal
devices.
ISO 5220:1981, Air distribution and air diffusion — Aerodynamic testing and rating of constant and variable dual or
single duct boxes and single duct units.
3 Definitions
For the purposes of this International Standard, the following definitions apply.
3.1
sound pressure level
L
p
ten times the logarithm to the base 10 of the ratio of the mean-square sound pressure of a sound to the square of
the reference sound pressure, in decibels
NOTE — The reference sound pressure is 20 μPa.
1)
To be published. (Revision of ISO 3741:1988 and ISO 3742:1988)
© ISO
ISO 5135:1997(E)
3.2
sound power level
L
W
ten times the logarithm to the base 10 of the ratio of a given sound power to the reference sound power, in decibels
−12
NOTE — The reference sound power is 1 pW (= 10 W).
3.3
frequency range of interest
the range which includes the octave bands with midband frequencies between 63 Hz and 8 000 Hz or the one-third-
octave bands with midband frequencies between 50 Hz and 10 000 Hz
NOTE — Many rooms will not be qualified for measurements below the one-third-octave band centred at 100 Hz and the
octave band centred at 125 Hz, respectively. In these cases the result may still be reported provided that all deviations are
clearly indicated in the test report.
3.4
reverberant sound field
that portion of the sound field in the test room over which the influence of sound received directly from the source is
negligible
4 Acoustic test facilities and procedures
This International Standard is applicable to equipment operating under steady state conditions and with a volume
less than 2 % of the volume of the reverberation room.
The acoustic test facilities, instrumentation and procedures to be used, including room qualification tests, are
described in ISO 3741. This document offers a choice of two methods for reverberation room measurements for
determining sound power levels. The comparison method uses a reference sound source having a known sound
power output. The direct method requires knowledge of the reverberation time of the room in which the
determination is made.
If there are substantial variations in the reverberant room characteristics due to the presence of the source to be
tested, then the test room shall also be qualified according to ISO 3741 with all equipment present in the room.
5 Installation and operation of equipment to be tested
5.1 General
5.1.1 When the equipment is mounted closer than 1 m to one or more reflecting planes the sound power level may
depend strongly on the position of the equipment relative to these planes. Therefore, install the equipment to be
tested in a position representative of normal usage. Figure 1 illustrates the overall test environment, with the specific
details of each type shown in figures 2 to 6.
NOTE — Reflecting planes may, for practical reasons, be simulated by panels with an area-related mass greater than
7 kg/m . Such panels should extend at least 1,2 m in all directions measured from any edge of the device under test. These
panels should be vibration isolated from the equipment under test.
5.1.2 Supply air to the equipment under test or exhaust air from it through a test installation in accordance with
ISO 5219 or ISO 5220.
5.1.3 Include air-flow control accessories (dampers, deflectors, straighteners, equalizers, etc.) normally used in
conjunction with the equipment under test in the test set-up. Locate and set them in the same manner as
recommended for the application of the equipment.
© ISO
ISO 5135:1997(E)
5.2 Test installation of air-terminal units, dampers and valves for measurement of the sound
radiated to the reverberation room
5.2.1 Position air-terminal devices normally installed in a boundary surface no closer than 1 m to the intersection of
any adjacent surface and away from any position of boundary surface symmetry, as shown in figure 2.
5.2.2 Mount air-terminal devices normally used at the intersection of two surfaces at the intersection of the two
surfaces not closer than 1 m to a third surface as shown in figure 3.
5.2.3 Install air-terminal devices not normally positioned at any boundary surface within the test room no closer
than 1 m to any surface and away from any position of room symmetry. Examples are shown in figure 4. Diffusers
installed on ducts without adjacent ceiling are typical examples.
5.2.4 The insta
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