SIST EN ISO 1680:2001

SLOVENSKI STANDARD
SIST EN ISO 1680:2001
01-september-2001
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Acoustics - Test code for the measurement of airborne noise emitted by rotating
electrical machinery (ISO 1680:1999)
Ta slovenski standard je istoveten z: EN ISO 1680:1999
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
SIST EN ISO 1680:2001 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 1680:2001

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SIST EN ISO 1680:2001

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SIST EN ISO 1680:2001

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SIST EN ISO 1680:2001

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SIST EN ISO 1680:2001
INTERNATIONAL ISO
STANDARD 1680
First edition
1999-10-01
Acoustics — Test code for the
measurement of airborne noise emitted by
rotating electrical machines
Acoustique — Code d'essai pour le mesurage du bruit aérien émis par les
machines électriques tournantes
A
Reference number
ISO 1680:1999(E)

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SIST EN ISO 1680:2001
ISO 1680:1999(E)
Contents
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Description of machinery family .4
5 Sound power determination .4
5.1 General.4
5.2 Guidelines for the selection of the most appropriate basic standard.5
5.3 Additional requirements .6
6 Installation and mounting conditions.7
6.1 Mounting of the machine.7
6.2 Auxiliary equipment and loaded machines.7
7 Operating conditions.7
7.1 General.7
7.2 Load .8
7.3 Variable speed devices .8
8 Measurement uncertainty .8
9 Determination of the emission sound pressure level .9
9.1 General.9
9.2 Selection of the relevant work station.9
9.3 Selection of basic standard to be used.9
9.4 Measurement uncertainty .9
10 Indication of noise emission quantities determined according to this International Standard .9
11 Information to be recorded .10
12 Information to be reported.10
©  ISO 1999
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 iso@iso.ch
Printed in Switzerland
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SIST EN ISO 1680:2001
© ISO
ISO 1680:1999(E)
13 Declaration and verification of noise emission values (if required). 11
Annex A (informative) Overview of International Standards for the determination of sound power levels
of machines and equipment . 12
Annex B (informative) Example of a dual-number declaration for rotating electrical machines . 14
Bibliography. 15
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SIST EN ISO 1680:2001
© ISO
ISO 1680:1999(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 3.
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 1680 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1,
Noise.
This first edition of ISO 1680 cancels and replaces ISO 1680-1:1986 and ISO 1680-2:1986, which have been
combined and technically revised.
Annexes A and B of this International Standard are for information only.
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SIST EN ISO 1680:2001
© ISO
ISO 1680:1999(E)
Introduction
This International Standard is a noise test code giving methods for determining the airborne sound radiation of
rotating electrical machines operating under steady-state conditions.
To characterize the airborne sound radiation, procedures are given to determine sound power levels and
additionally emission sound pressure levels, if required. Furthermore, requirements are given for the declaration and
verification of noise emission values.
Basic standards giving methods for determining sound power levels are as follows:
a) using sound pressure:
 grade 1 (precision): ISO 3741 and ISO 3745;
 grade 2 (engineering): ISO 3743-1, ISO 3743-2, ISO 3744, ISO 3747;
 grade 3 (survey): ISO 3746;
b) using sound intensity:
 all grades: ISO 9614-1;
 grades 2 and 3: ISO 9614-2.
The emission sound pressure level is determined on the basis of ISO 11203. Declaration and verification of noise
emission values follow ISO 4871.
This International Standard has been drafted in accordance with ISO 12001.
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SIST EN ISO 1680:2001

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SIST EN ISO 1680:2001
INTERNATIONAL STANDARD  © ISO ISO 1680:1999(E)
Acoustics — Test code for the measurement of airborne
noise emitted by rotating electrical machines
1 Scope
This International Standard specifies all the information necessary to carry out efficiently and under standardized
conditions the determination, declaration and verification of the noise emission characteristics of rotating electrical
machines. It specifies noise measurement methods that can be used, and specifies the operating and mounting
conditions that shall be used for the test.
Noise emission characteristics include the sound power level and emission sound pressure level. The determination
of these quantities is necessary
 for comparing the noise emitted by machines,
 to enable manufacturers to declare the noise emitted, and
 for the purposes of noise control.
The use of this International Standard as a noise test code ensures the reproducibility of the determination of the
noise emission characteristics within specified limits determined by the grade of accuracy of the basic noise
measurement method used. Noise measurement methods allowed by this International Standard are laboratory
methods (grade 1), engineering methods (grade 2) and survey methods (grade 3). Methods of engineering grade
(grade 2) are to be preferred.
This International Standard is applicable to rotating electrical machines of any length, width or height.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 3741, Acoustics — Determination of sound power levels of noise sources using sound pressure — Precision
1)
methods for reverberation rooms.
ISO 3743-1, Acoustics — Determination of sound power levels of noise sources — Engineering methods for small,
movable sources in reverberant fields — Part 1: Comparison method for hard-walled test rooms.
ISO 3743-2, 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.

1) Revision of ISO 3741:1988 and ISO 3742:1988.
1

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SIST EN ISO 1680:2001
© ISO
ISO 1680:1999(E)
ISO 3744,
Acoustics — Determination of sound power levels of noise sources using sound pressure — Engineering
method in an essentially free-field over a reflecting plane.
ISO 3745, Acoustics — Determination of sound power levels of noise sources — Precision methods for anechoic
and semi-anechoic rooms.
ISO 3746, Acoustics — Determination of sound power levels of noise sources using sound pressure — Survey
method using an enveloping measurement surface over a reflecting plane.
ISO 3747, Acoustics — Determination of sound power levels of noise sources using sound pressure — Comparison
method for use in situ.
ISO 4871, Acoustics — Declaration and verification of noise emission values of machinery and equipment.
ISO 7574-1, Acoustics — Statistical methods for determining and verifying stated noise emission values of
machinery and equipment — Part 1: General considerations and definitions.
ISO 7574-4, Acoustics — Statistical methods for determining and verifying stated noise emission values of
machinery and equipment — Part 4: Methods for stated values for batches of machines.
ISO 7779:1999, Acoustics — Measurement of airborne noise emitted by information technology and
telecommunications equipment.
ISO 9614-1, Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 1:
Measurement at discrete points.
ISO 9614-2, Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 2:
Measurement by scanning.
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 60034-1, Rotating electrical machines — Part 1: Rating and performance.
IEC 60651, Sound level meters.
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
sound pressure level
L
p
ten times the logarithm to the base 10 of the ratio of the time-averaged square of the sound pressure radiated by
the sound source under test to the square of the reference sound pressure
NOTE 1 Sound pressure levels are expressed in decibels.
NOTE 2 The frequency weighting or the width of the frequency band used, and time weighting (S, F or I, see IEC 60651),
–5
should be indicated. The reference sound pressure is 20 mPa (2 ´ 10 Pa).
EXAMPLE  The A-weighted sound pressure level with time weighting S is L .
pAS
3.2
measurement surface
hypothetical surface of area S, enveloping the source on which the measurement points are located
NOTE The measurement surface terminates on one or more reflecting planes.
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SIST EN ISO 1680:2001
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ISO 1680:1999(E)
3.3
surface sound pressure level
L
pf
energy average of the time-averaged sound pressure levels at all the microphone positions on the measurement
surface, with the background noise correction K and the environmental correction K applied
1 2
NOTE It is expressed in decibels.
3.4
sound intensity
fi
I
time-averaged value of the product of the instantaneous sound pressure and the associated sound velocity at a
point in a temporally stationary sound field
3.5
normal sound intensity level
L
In
ten times the logarithm to the base 10 of the ratio of the unsigned value of the normal component of the sound
intensity (which is radiated by the sound source under test and determined in a direction perpendicular to the
measurement surface) to the reference sound intensity
NOTE 1 It is expressed in decibels.
–12 –2
NOTE 2 The reference sound intensity is 10 Wm .
3.6
sound power level
L
W
ten times the logarithm to the base 10 of the ratio of the sound power radiated by the sound source under test to the
reference sound power
NOTE 1 It is expressed in decibels.
NOTE 2 The frequency weighting or the width of the frequency band used should be indicated. The reference sound power
–12
is 1 pW (10 W).
EXAMPLE  The A-weighted sound power level is denoted L .
WA
3.7
emission sound pressure
p
time-averaged sound pressure, 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, excluding the effects of background noise
as well as the effects of reflections from room surfaces other than the plane or planes permitted for the purpose of
the test
NOTE It is expressed in pascals.
3.8
emission sound pressure level
L
p
2
ten times the logarithm to the base 10 of the ratio of the square of the emission sound pressure, p (t), to the square
2
of the reference sound pressure, p , measured with a particular time weighting and a particular frequency
0
weighting, selected from those defined in IEC 60651
NOTE It is expressed in decibels. The reference sound pressure is 20 mPa.
EXAMPLES  The A-weighted emission sound pressure level with time weighting F is denoted L . The C-weighted peak
pAF
emission sound pressure level is denoted L .
pC,peak
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SIST EN ISO 1680:2001
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ISO 1680:1999(E)
3.9
noise emission declaration
information on the noise emitted by the machine, given by the manufacturer or supplier in technical documents or
other literature concerning noise emission values
NOTE The noise emission declaration may take the form of either the declared single-number noise emission value or the
declared dual-number noise emission value.
3.10
measured noise emission value
L
A-weighted sound power level, or the A-weighted time-averaged emission sound pressure level, or the C-weighted
peak emission sound pressure level, as determined from measurements
NOTE Measured values may be determined either from a single machine or from the average of a number of machines,
and are not rounded.
3.11
declared single-number noise emission value
L
d
sum of the measured noise emission value, and the associated uncertainty, , rounded to the nearest decibel:
L, K
L = L + K
d
3.12
declared dual-number noise emission value
L and K
measured noise emission value L, and its associated uncertainty K, rounded to the nearest decibel
4 Description of machinery family
This International Standard is applicable to self-standing rotating electrical machines, i.e. motors and generators
(d.c. and a.c machines), without any limitation on the output or voltage, and with any linear dimensions.
Families of devices covered by this International Standard include rotating electrical machines to be fed by the
following possibilities:
 a network (sinusoidal supply) whenever specially designed for that purpose;
 an associated converter.
In the case of supply by an converter, the noise radiated by the converter is excluded from the scope of this
International Standard; only the effect of non-sinusoidal voltage and current within the machine is to be taken into
account.
Auxiliary components required for the operation of the machine (e.g. oil pumps or cooling ventilators) should be
included when integrated with the machine. When these components are separately mounted, they shall not be
included as part of the machine under test.
5 Sound power determination
5.1 General
The sound power radiated by rotating electrical machines shall be determined on the basis of one of the following
basic standards:
 accuracy grade 1: ISO 3741, ISO 3745, ISO 9614-1;
 accuracy grade 2: ISO 3743-1, ISO 3743-2, ISO 3744, ISO 3747, ISO 9614-1, ISO 9614-2.
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Methods of engineering grade (grade 2) are to be preferred.
Furthermore, survey methods may also be used if it has been proved that no method with better accuracy is
practical:
 accuracy grade 3: ISO 3746, ISO 9614-1, ISO 9614-2.
5.2 Guidelines for the selection of the most appropriate basic standard
The usable basic standards are mainly distinguished by the following:
 different environmental conditions;
 different requirements with respect to the background noise levels related to the noise level of the machine
under test;
 different grades of accuracy;
 different quantities to be measured: sound pressure or sound intensity.
NOTE Detailed guidelines for the selection of the most appropriate basic standards are given in ISO 3740.
The sound intensity measurement method has the following advantages as compared to the sound pressure
measurement method.
a) Determination of the correct sound power will be possible regardless of whether the measurement surface lies
within or outside the near field.
b) Determination of the correct sound power will be possible in the presence of noise fields where the sound
pressure method gives results which are so wrong that they would be no longer conform to sound pressure
measurement standards.
c) It allows a better grade of accuracy for the sound power determination especially under the worst
environmental conditions (and therefore allows determination of the sound power level of machines in the
presence of noisy loading machines).
A description of the fields of application of the main basic standards is given in Table 1, supplemented by Figure 1.
A more precise distinction of these standards is shown in annex A.
Table 1 — Sound power determination procedures and relations to their fields of application
International Environment Background noise levels Grade of Quantity to
Standard accuracy be measured
ISO 3741 Special measurement room, Very low background noise levels grade 1 Sound pressure
"reverberant room"
ISO 3743-1 High reverberant ordinary room Low background noise level grade 2 Sound pressure
ISO 3743-2 Special measurement room Low background noise level grade 2 Sound pressure
ISO 3744 In situ, but with limited Low background noise levels grade 2 Sound pressure
environmental reflections
ISO 3745 Special measurement room, Very low back-ground noise levels grade 1 Sound pressure
"anechoic, semi-anechoic room"
ISO 3746 In situ, less limited Less limited back-ground noise grade 3 Sound pressure
environmental reflections levels
ISO 374
...