SIST EN ISO 3745:2012/A1:2017
(Amendment)Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for anechoic rooms and hemi-anechoic rooms - Amendment 1 (ISO 3745:2012/Amd 1:2017)
Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for anechoic rooms and hemi-anechoic rooms - Amendment 1 (ISO 3745:2012/Amd 1:2017)
Akustik - Bestimmung der Schallleistungs- und Schallenergiepegel von Geräuschquellen aus Schalldruckmessungen - Verfahren der Genauigkeitsklasse 1 für reflexionsarme Räume und Halbräume - Änderung 1 (ISO 3745:2012/Amd 1:2017)
Acoustique - Détermination des niveaux de puissance acoustique et des niveaux d'énergie acoustique émis par les sources de bruit à partir de la pression acoustique - Méthodes de laboratoire pour les salles anéchoïques et les salles semi-anéchoïques - Amendement 1 (ISO 3745:2012/Amd 1:2017)
Akustika - Ugotavljanje ravni zvočnih moči in ravni zvočne energije virov hrupa z zvočnim tlakom - Precizijska metoda za gluhe in polgluhe prostore - Dopolnilo A1 (ISO 3745:2012/Amd 1:2017)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 3745:2012/A1:2017
01-september-2017
$NXVWLND8JRWDYOMDQMHUDYQL]YRþQLKPRþLLQUDYQL]YRþQHHQHUJLMHYLURYKUXSD]
]YRþQLPWODNRP3UHFL]LMVNDPHWRGD]DJOXKHLQSROJOXKHSURVWRUH'RSROQLOR$
,62 $PG
Acoustics - Determination of sound power levels and sound energy levels of noise
sources using sound pressure - Precision methods for anechoic rooms and hemi-
anechoic rooms - Amendment 1 (ISO 3745:2012/Amd 1:2017)
Akustik - Bestimmung der Schallleistungs- und Schallenergiepegel von Geräuschquellen
aus Schalldruckmessungen - Verfahren der Genauigkeitsklasse 1 für reflexionsarme
Räume und Halbräume - Änderung 1 (ISO 3745:2012/Amd 1:2017)
Acoustique - Détermination des niveaux de puissance acoustique et des niveaux
d'énergie acoustique émis par les sources de bruit à partir de la pression acoustique -
Méthodes de laboratoire pour les salles anéchoïques et les salles semi-anéchoïques -
Amendement 1 (ISO 3745:2012/Amd 1:2017)
Ta slovenski standard je istoveten z: EN ISO 3745:2012/A1:2017
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
91.120.20 $NXVWLNDYVWDYEDK=YRþQD Acoustics in building. Sound
L]RODFLMD insulation
SIST EN ISO 3745:2012/A1:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 3745:2012/A1:2017
---------------------- Page: 2 ----------------------
SIST EN ISO 3745:2012/A1:2017
EN ISO 3745:2012/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2017
EUROPÄISCHE NORM
ICS 17.140.01
English Version
Acoustics - Determination of sound power levels and
sound energy levels of noise sources using sound pressure
- Precision methods for anechoic rooms and hemi-
anechoic rooms - Amendment 1 (ISO 3745:2012/Amd
1:2017)
Acoustique - Détermination des niveaux de puissance Akustik - Bestimmung der Schallleistungs- und
acoustique et des niveaux d'énergie acoustique émis Schallenergiepegel von Geräuschquellen aus
par les sources de bruit à partir de la pression Schalldruckmessungen - Verfahren der
acoustique - Méthodes de laboratoire pour les salles Genauigkeitsklasse 1 für reflexionsarme Räume und
anéchoïques et les salles semi-anéchoïques - Halbräume - Änderung 1 (ISO 3745:2012/Amd
Amendement 1 (ISO 3745:2012/Amd 1:2017) 1:2017)
This amendment A1 modifies the European Standard EN ISO 3745:2012; it was approved by CEN on 20 March 2017.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant 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 amendment 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3745:2012/A1:2017 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 3745:2012/A1:2017
EN ISO 3745:2012/A1:2017 (E)
Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC aimed to be covered . 4
2
---------------------- Page: 4 ----------------------
SIST EN ISO 3745:2012/A1:2017
EN ISO 3745:2012/A1:2017 (E)
European foreword
This document (EN ISO 3745:2012/A1:2017) 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 Amendment to the European Standard EN ISO 3745:2012 shall be given the status of a national
standard, either by publication of an identical text or by endorsement, at the latest by November 2017,
and conflicting national standards shall be withdrawn at the latest by November 2017.
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 has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.
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 3745:2012/Amd 1:2017 has been approved by CEN as EN ISO 3745:2012/A1:2017
without any modification.
3
---------------------- Page: 5 ----------------------
SIST EN ISO 3745:2012/A1:2017
EN ISO 3745:2012/A1:2017 (E)
Annex ZA
(informative)
Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC aimed to be covered
This European Standard has been prepared under a Commission’s standardization request M/396
(Machinery) to provide one voluntary means of conforming to essential requirements of Directive
2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and
amending Directive 95/16/EC (recast).
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding essential requirements
of that Directive, and associated EFTA regulations.
Table ZA.1 — Correspondence between this European Standard and Directive 2006/42/EC
Essential Requirements of Clause(s)/sub-clause(s) of Remarks/Notes
Directive this EN
1.7.4.2 u) All clauses
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
4
---------------------- Page: 6 ----------------------
SIST EN ISO 3745:2012/A1:2017
INTERNATIONAL ISO
STANDARD 3745
Third edition
2012-03-15
AMENDMENT 1
2017-04
Acoustics — Determination of sound
power levels and sound energy levels
of noise sources using sound pressure
— Precision methods for anechoic
rooms and hemi-anechoic rooms
AMENDMENT 1
Acoustique — Détermination des niveaux de puissance acoustique et
des niveaux d’énergie acoustique émis par les sources de bruit à partir
de la pression acoustique — Méthodes de laboratoire pour les salles
anéchoïques et les salles semi-anéchoïques
AMENDEMENT 1
Reference number
ISO 3745:2012/Amd.1:2017(E)
©
ISO 2017
---------------------- Page: 7 ----------------------
SIST EN ISO 3745:2012/A1:2017
ISO 3745:2012/Amd.1:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, 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
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 3745:2012/A1:2017
ISO 3745:2012/Amd.1:2017(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: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
© ISO 2017 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 3745:2012/A1:2017
---------------------- Page: 10 ----------------------
SIST EN ISO 3745:2012/A1:2017
ISO 3745:2012/Amd.1:2017(E)
Acoustics — Determination of sound power levels and
sound energy levels of noise sources using sound pressure
— Precision methods for anechoic rooms and hemi-
anechoic rooms
AMENDMENT 1
Page 1, Normative references
Add the following reference:
ISO 26101:2017, Acoustics — Test methods for the qualification of free-field environments
Page 29, Annex A
Replace Annex A with the following:
Annex A
(normative)
General procedures for qualification of anechoic and hemi-anechoic rooms
A.1 General
The performance of an anechoic or hemi-anechoic room is tested by comparing the spatial decrease of
sound pressure emitted from a test sound source with the decrease of sound pressure that would occur
in an ideal free sound field. The evaluation of this performance is based on the procedures outlined in
ISO 26101.
This annex contains the qualification criteria and test parameters which are required to qualify test
rooms to the requirements of this document. To conform to this document, when no specific criteria are
given, the requirements appropriate for sound power measurements in ISO 26101 shall be met.
A check of the room performance is recommended after modification of the room absorbers and
periodically at intervals not exceeding 5 years.
The following is a comparison of this annex with ISO 26101 and previous versions of this annex:
a) As in the previous version (ISO 3745:2012, Annex A), this annex requires that test rooms are
qualified using discrete-frequency (e.g. pure tone) measurements unless it is known that the
specific noise source under test radiates only broadband noise (see Note below).
b) Consistent with the wording in ISO 26101, this annex defines methods for “discrete-frequency”
and “broadband” qualification of test rooms. Discrete-frequency qualification is essentially
identical to the pure tone qualification used in the previous versions of this annex. In both cases,
only one pure tone is analysed in each frequency band in Table A.1. The wording change from
“pure tone qualification” is consistent with, for example, common fast Fourier transform methods
such as the use of pseudo random noise and narrow bandwidth analysis; see Reference [37] and
ISO 26101:2017, 5.1.4.1, 5.1.4.2.
c) For the purposes of this document, this annex does not require an evaluation of the position of
the acoustic centre. In this annex
...
SLOVENSKI STANDARD
SIST EN ISO 3745:2012/oprA1:2015
01-april-2015
$NXVWLND8JRWDYOMDQMHUDYQL]YRþQLKPRþLLQUDYQL]YRþQHHQHUJLMHYLURYKUXSD]
]YRþQLPWODNRP3UHFL]LMVNDPHWRGD]DJOXKHLQSROJOXKHSURVWRUH ,62
'$0
Acoustics - Determination of sound power levels and sound energy levels of noise
sources using sound pressure - Precision methods for anechoic rooms and hemi-
anechoic rooms (ISO 3745:2012/DAM 1:2015)
Akustik - Bestimmung der Schallleistungs- und Schallenergiepegel von Geräuschquellen
aus Schalldruckmessungen - Verfahren der Genauigkeitsklasse 1 für reflexionsarme
Räume und Halbräume (ISO 3745:2012/DAM 1:2015)
Acoustique - Détermination des niveaux de puissance acoustique et des niveaux
d'énergie acoustique émis par les sources de bruit à partir de la pression acoustique -
Méthodes de laboratoire pour les salles anéchoïques et les salles semi-anéchoïques
(ISO 3745:2012/DAM 1:2015)
Ta slovenski standard je istoveten z: EN ISO 3745:2012/prA1
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
91.120.20 $NXVWLNDYVWDYEDK=YRþQD Acoustics in building. Sound
L]RODFLMD insulation
SIST EN ISO 3745:2012/oprA1:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 3745:2012/oprA1:2015
---------------------- Page: 2 ----------------------
SIST EN ISO 3745:2012/oprA1:2015
DRAFT AMENDMENT
ISO 3745:2012/DAM 1
ISO/TC 43/SC 1 Secretariat: DS
Voting begins on: Voting terminates on:
2015-02-19 2015-05-19
Acoustics — Determination of sound power levels
and sound energy levels of noise sources using sound
pressure — Precision methods for anechoic rooms and
hemi-anechoic rooms
AMENDMENT 1
Acoustique — Détermination des niveaux de puissance acoustique et des niveaux d’énergie acoustique
émis par les sources de bruit à partir de la pression acoustique — Méthodes de laboratoire pour les salles
anéchoïques et les salles semi-anéchoïques
AMENDEMENT 1
ICS: 17.140.01
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for
Standardization (ISO), and processed under the ISO lead mode of collaboration
as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments
received, will be submitted to a parallel two-month approval vote in ISO and
THIS DOCUMENT IS A DRAFT CIRCULATED
formal vote in CEN.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO 3745:2012/DAM 1:2014(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2014
---------------------- Page: 3 ----------------------
SIST EN ISO 3745:2012/oprA1:2015
ISO 3745:2012/DAM 1:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014
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
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 2014 – All rights reserved
---------------------- Page: 4 ----------------------
SIST EN ISO 3745:2012/oprA1:2015
ISO 3745:2012/DAM 1
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.
Amendment 1 to ISO 3745:2012 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee
SC 1, Noise.
© ISO 2014 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST EN ISO 3745:2012/oprA1:2015
---------------------- Page: 6 ----------------------
SIST EN ISO 3745:2012/oprA1:2015
DRAFT AMENDMENT ISO 3745:2012/DAM 1
Acoustics — Determination of sound power levels and sound
energy levels of noise sources using sound pressure —
Precision methods for anechoic rooms and hemi-anechoic
rooms - AMENDMENT 1
Page 1, 2 Normative references
Add the following reference:
ISO 26101:2012, Acoustics — Test methods for the qualification of free-field environments
1)
ISO 26101:2012/Amd.1:— , Acoustics — Test methods for the qualification of free-field environments —
Amendment 1
Page 29, Annex A
Replace the whole text by the following:
1)
To be published.
© ISO 2014 – All rights reserved
1
---------------------- Page: 7 ----------------------
SIST EN ISO 3745:2012/oprA1:2015
ISO 3745:2012/DAM 1
Annex A
(normative)
General procedures for qualification of anechoic and hemi-anechoic
rooms
A.1 General
The performance of an anechoic or hemi-anechoic room is tested by comparing the spatial decrease of sound
pressure emitted from a test sound source with the decrease of sound pressure that would occur in an ideal
free sound field. The evaluation of this performance is based on the procedures outlined in ISO 26101:2012
and ISO 26101:2012/Amd.1:— on “Test methods for the qualification of free field environments”.
This annex contains the qualification criteria and test parameters which are required to qualify test rooms to
the requirements of this International Standard. To conform to this International Standard, when no specific
criteria are given, the requirements appropriate for sound power measurements in ISO 26101:2012 (as
amended by ISO 26101:2012/Amd.1:—) shall be met.
A check of the room performance is recommended after modification of the room absorbers and periodically at
intervals not exceeding 5 years.
Following is a comparison of this annex with ISO 26101:2012 and previous version of this annex:
a) As in the previous version of ISO 3745:2012, Annex A, this annex requires that test rooms are qualified
using discrete-frequency (e.g., pure tone) measurements unless it is known that the specific noise source
under test radiates only broadband noise (see NOTE).
b) Consistent with the wording in ISO 26101:2012 this annex defines methods for “discrete-frequency” and
“broadband qualification” of test rooms. Discrete-frequency qualification is essentially identical to the pure
tone qualification used in previous versions of this annex. In both cases only one pure tone is analysed in
each frequency band in Table A.1. The wording change from “pure tone qualification” is consistent with
improved analysis methods such as the use of pseudo random noise and narrow bandwidth analysis, see
reference [37] and ISO 26101:2012, 5.1.4.1, 5.1.4.2.
c) For the purposes of this International Standard, this annex does not require an evaluation of the position
of the acoustic centre. In this annex, the term “acoustic centre” as originally used in ISO 3745 and
ISO 26101:2012, is interpreted as (or, replaced by) either the mathematical origin of the microphone
traverse (see A.3.3) or the primary sound radiating region of the test sound source.
d) This annex follows ISO 26101:2012, 5.1.3.2 in that it requires the mathematical origin for evaluation of the
inverse square law to be restricted to a point that lies within the physical volume occupied by the test
sound source. This is a change from previous versions of this Annex, and as a result, a reduction of the
qualified frequency range and/or qualified distances may arise in test rooms that were previously qualified
using calculation methods that allowed large acoustic centre offsets.
e) Based on guidance given in ISO 26101:2012, this annex requires different traverse paths than required in
previous versions of Annex A of ISO 3745 (see A.3.3).
f) Following the requirements in ISO 26101:2012, background noise limits, and requirements on the test
sound source stability have been relaxed compared to previous versions of Annex A of ISO 3745.
NOTE The general qualification procedure and criteria in this annex are unchanged from the 2012 and 1975 versions
of Annex A of ISO 3745. In particular, the default qualification method uses pure tones as a test signal (referred to as
discrete frequency qualification in this annex). This is a significant difference from ISO 3745:2003, Annex A where the
© ISO 2014 – All rights reserved
2
---------------------- Page: 8 ----------------------
SIST EN ISO 3745:2012/oprA1:2015
ISO 3745:2012/DAM 1
default qualification procedure used a broadband signal. However, the qualification criteria (Table A.1) have remained the
same in all versions of this annex. As a result, in a test room qualified using only broadband noise according to
ISO 3745:2003, Annex A, the frequency range and/or distances over which the test room can be qualified may be reduced
when re-tested using discrete frequency qualification.
A.2 Qualification criteria
A.2.1 General
In order for a space within an environment to be deemed anechoic or hemi-anechoic for measurements in
accordance with this International Standard the following criteria and test parameters shall be used to qualify
the test environment.
A.2.2 Maximum allowable deviations from inverse square law
The deviations of the measured sound pressure levels from those estimated using the inverse square law,
obtained according to ISO 26101:2012, 5.1 (but excluding 5.1.6), shall not exceed the values given in
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.