Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering methods for small, movable sources in reverberant fields - Part 2: Methods for special reverberation test rooms - Amendment 1 (ISO 3743-2:1994/DAM 1:2013)

2015-08-06: WI stopped due to cancellation of equivalent ISO project (see ISO notification in dataservice on 2015-08-05).

Akustik - Bestimmung der Schallleistungspegel von Geräuschquellen aus Schalldruckmessungen - Verfahren der Genauigkeitsklasse 2 für kleine, transportable Quellen in Hallfeldern - Teil 2: Verfahren für Sonder-Hallräume - Änderung 1 (ISO 3743-2:1994/DAM 1:2013)

Acoustique - Détermination des niveaux de puissance acoustique émis par les sources de bruit à partir de la pression acoustique - Méthodes d'expertise en champ réverbéré applicables aux petites sources transportables - Partie 2: Méthodes en salle d'essai réverbérante spéciale - Amendement 1 (ISO 3743-2:1994/DAM 1:2013)

Akustika - Ugotavljanje ravni zvočnih moči virov hrupa z merjenjem zvočnega tlaka - Inženirske metode za majhne premične vire v odmevnih poljih - 2. del: Metode za posebne odmevnice - Dopolnilo 1 (ISO 3743-2:1994/DAM 1:2013)

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Publication Date
25-May-2015
Withdrawal Date
25-Nov-2015
Technical Committee
Drafting Committee
Current Stage
4098 - Decision to abandon - Enquiry
Completion Date
05-Aug-2015

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SLOVENSKI STANDARD
SIST EN ISO 3743-2:2009/prA1:2013
01-oktober-2013
$NXVWLND8JRWDYOMDQMHUDYQL]YRþQLKPRþLYLURYKUXSD]PHUMHQMHP]YRþQHJD
WODND,QåHQLUVNHPHWRGH]DPDMKQHSUHPLþQHYLUHYRGPHYQLKSROMLKGHO
0HWRGH]DSRVHEQHRGPHYQLFH'RSROQLOR ,62'$0
Acoustics - Determination of sound power levels of noise sources using sound pressure -
Engineering methods for small, movable sources in reverberant fields - Part 2: Methods
for special reverberation test rooms - Amendment 1 (ISO 3743-2:1994/DAM 1:2013)
Akustik - Bestimmung der Schallleistungspegel von Geräuschquellen aus
Schalldruckmessungen - Verfahren der Genauigkeitsklasse 2 für kleine, transportable
Quellen in Hallfeldern - Teil 2: Verfahren für Sonder-Hallräume - Änderung 1 (ISO 3743-
2:1994/DAM 1:2013)
Acoustique - Détermination des niveaux de puissance acoustique émis par les sources
de bruit à partir de la pression acoustique - Méthodes d'expertise en champ réverbéré
applicables aux petites sources transportables - Partie 2: Méthodes en salle d'essai
réverbérante spéciale - Amendement 1 (ISO 3743-2:1994/DAM 1:2013)
Ta slovenski standard je istoveten z: EN ISO 3743-2:2009/prA1
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
SIST EN ISO 3743-2:2009/prA1:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN ISO 3743-2:2009/prA1:2013

SIST EN ISO 3743-2:2009/prA1:2013

DRAFT AMENDMENT ISO 3743-2:1994/DAM 1
ISO/TC 43/SC 1 Secretariat: DS
Voting begins on Voting terminates on

2013-08-08 2014-01-08
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION  •  МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ  •  ORGANISATION INTERNATIONALE DE NORMALISATION

Acoustics — Determination of sound power levels of noise
sources using sound pressure — Engineering methods for
small, movable sources in reverberant fields —
Part 2:
Methods for special reverberation test rooms
AMENDMENT 1
Acoustique — Détermination des niveaux de puissance acoustique émis par les sources de bruit à partir de la
pression acoustique — Méthodes d'expertise en champ réverbéré applicables aux petites sources
transportables —
Partie 2: Méthodes en salle d'essai réverbérante spéciale
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 formal vote in CEN.

To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.

THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
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©  International Organization for Standardization, 2013

SIST EN ISO 3743-2:2009/prA1:2013
ISO 3743-2:1994/DAM 1
©  ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any
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SIST EN ISO 3743-2:2009/prA1:2013
ISO 3743-2:1994/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 3743-2:1994 was prepared by Technical Committee ISO/TC 43, Acoustics,
Subcommittee SC 1, Noise.
iii
SIST EN ISO 3743-2:2009/prA1:2013

SIST EN ISO 3743-2:2009/prA1:2013
DRAFT AMENDMENT ISO 3743-2:1994/DAM 1

Acoustics — Determination of sound power levels of noise
sources using sound pressure — Engineering methods for
small, movable sources in reverberant fields — Part 2: Methods
for special reverberation test rooms — AMENDMENT 1
Page iii: Introduction, 0.1, second sentence:
Delete the phrase “as shown in table 0.1”.
Page v:
Delete Table 0.1
Page 2: 1.4 Measurement uncertainty
Replace the existing text in 1.4 with the following:
1.4 Measurement uncertainty
1.4.1 Methodology
The uncertainties of sound power levels, u(L ), in decibels, determined according to this part of ISO 3743 are
W
estimated by the total standard deviation, σ , in decibels:
tot
u(L ) ≈ σ (1)
W tot
This total standard deviation is obtained using the modelling approach described in ISO/IEC Guide 98-3. This
requires a mathematical model which in case of lack of knowledge can be substituted with results from
measurements, including results from round robin tests.
In this context this standard deviation is expressed by the standard deviation of reproducibility of the method,
σ , in decibels, and the standard deviation, σ , in decibels, describing the uncertainty due to the
R0 omc
variations of the operating and mounting conditions of the source under test according to:
2 2
σ = σ + σ (2)
tot omc
R0
Equation (2) shows that variations of operating and mounting conditions expressed by σ should be taken
omc
into account before a measurement procedure with a certain grade of accuracy (characterized by σ ) is
R0
selected for a specific machine family (see 1.4.5 and Annex D.3).
NOTE If different measurement procedures offered by the ISO 3740 series are used, systematic numerical deviations
(biases) may additionally occur.
Derived from σ the expanded measurement uncertainty U, in decibels, shall be calculated from
,
tot
U = k σ (3)
tot
SIST EN ISO 3743-2:2009/prA1:2013
ISO 3743-2:1994/DAM 1
The expanded uncertainty depends on the degree of confidence that is desired. For a normal distribution of
measured values, there is a 95% confidence that the true value lies within the range [L - U] to [L + U]. This
W W
corresponds to a coverage factor of k = 2.
If the purpose of determining the sound power level is to compare the result with a limit value, it might be more
appropriate to apply the coverage factor for a one-sided normal distribution. In that case, the coverage factor
k = 1,6 corresponds to a 95 % confidence.
1.4.2 Determination of σ
omc
The standard deviation σ [see Equation (D.1)] which describes the uncertainty associated with the
omc
variations of the operating and mounting conditions for the particular source under test shall be taken into
account when determining the measurement uncertainty. It can be determined separately from repeated
measurements carried out on the same source at the same location by the same persons, using the same
measuring instruments and the same measurement position(s). To determine σ repeated sound pressure
omc
levels are measured either at the microphone position associated with the highest sound pressure level, or
measured and averaged over the entire measurement surface. Measured levels are then corrected for
background noise. For each of these repeated measurements, the mounting of the machine and its operating

conditions are to be readjusted. For the individual sound source under test, σ is designated as σ . It is
omc omc
possible that a noise test code provides a value of σ which is representative for the machine family
omc
concerned. This value should take into account all possible variations of operating and mounting conditions
that are within the scope of the noise test code.
NOTE If the sound power has only a small variation with time and the measurement procedure is defined properly, a
value of 0,5 dB for σ may be applicable. In other cases, for example, a large influence of the material flow in and out
omc
of the machine or material flow that may vary in an unforeseeable manner, a value of 2 dB may be appropriate. However,
in extreme cases such as strongly varying noise generated by the processed material (stone breaking machines, metal
cutting machines and presses operating under load) a value of 4 dB may result.
1.4.3 Determination of σ
R0
1.4.3.1 General
The standard deviation σ includes uncertainty due to all conditions and situations allowed by this part of
R0
ISO 3743 (different radiation characteristics of the source under test, different instrumentation, different
realizations of the measurement procedure), except the influence due to variations of the sound power of the
source under test. The latter is considered separately by σ .
omc
The values of σ given in Table 1 reflect the current knowledge. They are typical upper bounds taking into
R0
consideration the great variety of machines and equipment covered by this part of ISO 3743. Machinery-
specific values may be derived from round robin tests (see 1.4.3.2) or by using the mathematical modelling
approach (see 1.4.3.3). They should be given in noise test codes specific to machinery families (see 1.4.2 and
Annex D).
1.4.3.2 Round Robin Test
The round robin test for determining σ has to be carried out according to ISO 5725, where the sound
R0
power level of the source under test is determined under reproducibility conditions i.e. different persons
carrying out measurements at different testing locations with different measuring instruments. Such a test

provides the total standard deviation σ relevant for the individual sound source which has been used for
tot
the round robin test. Participating laboratories in round robin tests should cover all possible practical
situations.
SIST EN ISO 3743-2:2009/prA1:2013
ISO 3743-2:1994/DAM 1

This total standard deviation σ , in decibels, of all results obtained with a round robin test includes the
tot
′ ′
standard deviation σ and allows σ to be determined by using Equation (4):
omc R0
2 2
′ ′ ′ (4)
σ = σ − σ
R0 tot omc

If σ values obtained from many different pieces of machinery belonging to the same family deviate within a
R0
small range only, their mean value can be regarded as typical for the application of this part of ISO 3743 to
this particular family and used as σ . Whenever available, such value should be given in the noise test code
R0
specific to the machine family concerned (together with σ ) and used in particular for the purpose of
omc
declaring noise emission values.
If no round robin test has been carried out, the existing knowledge about the noise emission from a particular
family of machines may be used to estimate realistic values of σ .
R0
For certain applications the effort for the round robin test can be reduced by omitting measurements for
different locations, e.g. if machines under test usually are installed under conditions with a small background
noise correction K , or if the noise emission of a machine should be checked at the same location again.
Results of such delimited tests should be denoted by σ , and this designation should also be used for
R0, DL
tests on large machines being not movable in space.
Values for can be expected to be lower than those given in Table 1.
σ
R0, DL
The determination of σ using Equation (4) is imprecise if σ is only slightly higher than σ . In this
R0 tot omc
case Equation (4) provides a small value of σ but with a low accuracy. To limit this inaccuracy σ
R0 omc
should not exceed σ / 2 .
tot
1.4.3.3 Modelling approach for σ
R0
Generally σ , in decibels, is dependent upon several partial uncertainty components, c ⋅u , associated with
R0 i i
the different measurement parameters such as uncertainties of instruments, environmental corrections,
microphone positions, etc. If these contributions are assumed to be uncorrelated σ can be described by
R0
the modelling approach presented in ISO/IEC Guide 98-3, as follows:
2 2 2
( ) ( ) ( ) (5)
σ ≈ c u + c u + . + c u
R0 1 1 2 2 n n
In Equation (5) the uncertainty components due to the variations of the sound emission of the source are not
included. These components are covered by σ . Annex D discusses each component of the un
...

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