IEC 60704-1:2010

IEC 60704-1 ®
Edition 3.0 2010-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 1: General requirements
Appareils électrodomestiques et analogues – Code d’essai pour la détermination
du bruit aérien –
Partie 1: Exigences générales
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IEC 60704-1 ®
Edition 3.0 2010-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 1: General requirements
Appareils électrodomestiques et analogues – Code d’essai pour la détermination
du bruit aérien –
Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 13.120; 97.170 ISBN 978-2-88910-255-6
– 2 – 60704-1 © IEC:2010
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope and object.7
1.1 Scope.7
1.1.1 General .7
1.1.2 Types of noise.7
1.1.3 Size of the source.7
1.2 Object .7
1.3 Measurement uncertainty .8
2 Normative references .8
3 Terms and definitions .9
4 Measurement methods and acoustical environments .10
4.1 General .10
4.2 Direct method.10
4.3 Comparison method .11
4.4 Acoustical environments.11
4.4.1 General requirements and criterion for adequacy of the test
environment .11
4.4.2 Criterion for background noise level .11
4.4.3 Environmental conditions.12
5 Instrumentation .12
5.1 Instrumentation for measuring acoustical data.12
5.2 Instrumentation for measuring climatic conditions.12
5.3 Instrumentation for measuring operating conditions.12
6 Operation and location of appliances under test .12
6.1 Equipping and pre-conditioning of appliances.12
6.2 Supply of electric energy and of water or gas .13
6.3 Climatic conditions .13
6.4 Loading and operating of appliances during tests .14
6.5 Location and mounting of appliances.14
7 Measurement of sound pressure levels.16
7.1 Microphone array, measurement surface and RSS location for essentially
free field conditions over reflecting plane(s) .16
7.2 Microphone array and RSS location in hard-walled test rooms .18
7.3 Microphone array and RSS location in special reverberation test rooms .18
7.4 Measurements.19
8 Calculation of sound pressure and sound power levels.19
8.1 General .19
8.2 Corrections for background noise levels .20
8.3 Corrections for the test environment.20
8.4 Calculation of sound pressure level averaged over the microphone positions .20
8.5 Calculation of sound power levels with the comparison method .21
8.6 Calculation of sound power levels in free field conditions over a reflecting
plane.21
8.7 Calculation of A-weighted sound power level with the direct method in
special reverberation test rooms.21

60704-1 © IEC:2010 – 3 –
9 Information to be recorded.22
9.1 General data .22
9.2 Description of appliance under test .22
9.3 Measurement method.22
9.4 Acoustical test environment.22
9.5 Instrumentation .23
9.6 Equipment and pre-conditioning of appliance under test.23
9.7 Electric supply, water supply, etc. .23
9.8 Climatic conditions .23
9.9 Operation of the appliance under test.23
9.10 Location and mounting of the appliance under test .23
9.11 Microphone array .23
9.12 Measurement data.24
9.13 Calculated sound pressure and sound power levels .24
10 Information to be reported .24
10.1 General data 9.1 .24
10.2 Appliance under test 9.2.24
10.3 Test conditions for the appliance .25
10.4 Acoustical data.25
Annex A (normative) Standard test table.31
Annex B (normative) Test enclosure .32
Annex C (informative) Guidelines for the design of simple test rooms with essentially
free field conditions .33
Bibliography.34

Figure 1 – Measurement surface – parallelepiped – with key microphone positions, for
floor free-standing appliances .26
Figure 2 − Measurement surface – parallelepiped – with key microphone positions, for
floor standing appliances placed against a wall.26
Figure 3 – Measurement surface – parallelepiped – with key microphone positions, for
high floor-standing appliances placed against a wall.
Figure 4 − Measurement surface − hemisphere − with key microphone positions, for
hand-held, table type and floor-treatment appliances .28
Figure 5 – Measurement surface − quarter-sphere − with key microphone positions, for
small floor-standing appliances placed against a wall .29
Figure 6 − Measurement surface – parallelepiped – with five or nine microphone
positions for stand-type appliances .30
Figure A.1 – Example of standard test table.31
Figure B.1 – Test enclosure .32

– 4 – 60704-1 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION
OF AIRBORNE ACOUSTICAL NOISE –

Part 1: General requirements
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60704-1 has been prepared by IEC technical committee 59:
Performance of household and similar electrical appliances.
This third edition cancels and replaces the second edition published in 1997 and constitutes
an update and an editorial revision. It also includes the description of an appropriate test
enclosure for appliances to be built in.
The text of this standard is based on the following documents:
FDIS Report on voting
59/546/FDIS 59/549/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

60704-1 © IEC:2010 – 5 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 60704 series, under the general title Household and similar
electrical appliances – Test code for the determination of airborne acoustical noise, can be
found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – 60704-1 © IEC:2010
INTRODUCTION
Although the noise emitted by household appliances does not generally present a hazard to
the hearing of the operator and other exposed persons, the need for standardization
procedures for the determination of the noise emitted has been recognized for a long time.
Such procedures should be specified, not only for special types of appliances, but also the
principles should be applicable to the majority of appliances in general use.
Generally, the determination of noise levels is only part of a comprehensive testing procedure
covering many aspects of the properties and performances of the appliance. It is therefore
important that the requirements for noise measurements (such as test environment,
instrumentation, and amount of labour involved) should be kept at a modest level.
The results of noise measurements will be used for many purposes, for example for noise
declaration, as well as for comparing the noise emitted by a specific appliance to the noise
emitted by other appliances of the same family. In other cases, the results will be taken as a
basis for engineering action in the development stages of new pieces of equipment, or in
deciding on means for sound insulation. For all purposes, it is important to specify procedures
with known accuracy so that the results of measurements taken by different laboratories can
be compared.
These conditions have, as far as possible, been taken into account in the preparation of this
test code. The acoustic measuring methods are based on those described in ISO 3743-1,
ISO 3743-2 and ISO 3744.
The adoption of these methods permits the use of semi-anechoic rooms, special reverberation
test rooms and hard-walled test rooms. The result of the measurements is the sound power
level of the appliance. Within the measuring uncertainty specific to these methods, the results
from the determination under free field conditions over a reflecting plane are equal to those
obtained in reverberant fields. The use of intensity methods as described in ISO 9614-1 and
ISO 9614-2 is subject to a specific part 2.
It should be emphasized that this test code is concerned with airborne noise only. In some
cases, structure-borne noise, for example transmitted to the adjoining room, may be of
importance.
60704-1 © IEC:2010 – 7 –
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION
OF AIRBORNE ACOUSTICAL NOISE –

Part 1: General requirements
1 Scope and object
1.1 Scope
1.1.1 General
This part of IEC 60704 applies to electric appliances (including their accessories or
components) for household and similar use, supplied from mains or from batteries.
By similar use is understood the use in similar conditions as in households, for example in
inns, coffee-houses, tea-rooms, hotels, barber or hairdresser shops, launderettes, etc., if not
otherwise specified in part 2.
This standard does not apply to
– appliances, equipment or machines designed exclusively for industrial or professional
purposes;
– appliances which are integrated parts of a building or its installations, such as equipment
for air conditioning, heating and ventilating (except household fans, cooker hoods and free
standing heating appliances), oil burners for central heating, pumps for water supply and
for sewage systems;
– separate motors or generators;
– appliances for outdoor use.
1.1.2 Types of noise
A classification of different types of noise is given in ISO 12001. The method specified in
ISO 3744 is suitable for measurements of all types of noise emitted by household appliances.
The methods specified in ISO 3743-1 and ISO 3743-2 are suitable for all types of noise,
except for sources of impulsive noise consisting of short duration noise bursts. This will be
taken into account in the preparation of parts 2.
1.1.3 Size of the source
The method specified in ISO 3744 is applicable to noise sources of any size. Limitations for
the size of the source are given in 1.3 of ISO 3743-1 and ISO 3743-2. This will be taken into
account in the preparation of parts 2.
1.2 Object
This standard is concerned with objective methods of engineering accuracy (grade 2
according to ISO 12001) for determining sound power levels L , expressed in decibels (dB)
W
with reference to a sound power of one picowatt (1 pW), of airborne acoustical noise within
the specified frequency range of interest (generally including the octave bands with centre
frequencies from 125 Hz to 8 000 Hz), and for prescribed operating conditions of the
appliance to be measured.
The following quantities are used:

– 8 – 60704-1 © IEC:2010
– A-weighted sound power level, L ; and
WA
– octave band sound power levels.
In general, the described methods are specified for appliances without an operator present. A
part 2 can specify that an operator will be present only for the (rare) cases where an
appliance can only be operated, or must be fed, by an operator.
Methods for determining sound power levels with precision accuracy (grade 1 according to
ISO 12001), specified for example in ISO 3741 and ISO 3745, are not included in this
standard. They may, however, be applied if the appropriate test environment and
instrumentation are available.
NOTE 1 The noise values obtained under the described conditions of this part will not necessarily correspond with
the noise experienced under the operational conditions of practical use.
NOTE 2 For quality control during production etc., simplified methods may be appropriate. For noise reduction
purposes, other measurement methods employing, for example, narrow-band analysis or intensity techniques
usually will have to be applied. These methods are not covered by this part.
1.3 Measurement uncertainty
The estimated values of the standard deviations of reproducibility of sound power levels
determined according to this part are given in 1.4 of ISO 3743-1 and of ISO 3743-2, and in 1.4
of ISO 3744. But for a particular family of appliances of similar size with similar operating
conditions, the standard deviations of reproducibility may be smaller than these values.
Hence, in part 2, standard deviations smaller than those listed in ISO standards may be
stated if substantiation is available from the results of suitable interlaboratory tests.
IEC 60704-3 gives values of standard deviations of reproducibility for several categories of
appliances.
In case of discrepancies between the measurements where the results normally remain inside
the foreseen standard deviation, it will be necessary to perform measurements according to
the upper grade of accuracy: grade 1, laboratory or precision, as described in ISO 3741 or
ISO 3745.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60038:2009, IEC standard voltages
IEC 60704-3:2006, Household and similar electrical appliances – Test code for the
determination of airborne acoustical noise – Part 3: Procedure for determining and verifying
declared noise emission values
IEC 61260:1995, Electroacoustics – Octave-band and fractional-octave-band filters
IEC 61672-1:2002, Electroacoustics – Sound level meters – Part 1: Specifications
ISO 3741:1999, Acoustics – Determination of sound power levels of noise sources using
sound pressure – Precision methods for reverberation rooms
ISO 3743-1:1994, 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

60704-1 © IEC:2010 – 9 –
ISO 3743-2:1994, 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
ISO 3744:1994, Acoustics – Determination of sound power levels of noise sources using
sound pressure – Engineering method in an essentially free field over a reflecting plane
ISO 3745:2003, Acoustics – Determination of sound power levels of noise sources using
sound pressure – Precision method for anechoic and hemi-anechoic rooms
ISO 6926:1999, Acoustics – Requirements for the performance and calibration of reference
sound sources used for the determination of sound power levels
ISO 12001:1996, Acoustics – Noise emitted by machinery and equipment – Rules for the
drafting and presentation of a noise test code
3 Terms and definitions
For the purposes of this document, the following definitions apply. Terms and definitions
pertinent to the determination of sound power levels may be found in ISO 3743-1, ISO 3743-2
and ISO 3744.
3.1
measurement time interval
portion or a multiple of an operational period or operational cycle for which the sound power
levels are determined
3.2
operational period
an interval of time during which a specified process is accomplished by the appliance under
test (for example washing or rinsing or drying for a dishwasher)
3.3
operational cycle
a specific sequence of operational periods occurring while the appliance under test performs
a complete work cycle. During the operational cycle, each operational period is associated
with a specific process that may occur only once, or may be repeated (for example, for a
dishwasher, washing and rinsing and drying)
3.4
time history
a continuous recording of the sound pressure level (for a distinct microphone position) as a
function of time, which is obtained during one or more operational periods of an operational
cycle
3.5
standard test operator
a person necessary for operating or feeding the appliance under test, not wearing abnormally
sound absorptive clothing which might influence the sound measurements
3.6
centre of location or position of a source
the term used for describing the location or position of the source (appliance) to be tested
within the test environment and, in free field environment, with respect to the co-ordinate
system of microphone positions

– 10 – 60704-1 © IEC:2010
The centre of location is such that the centre of the appliance coincides with the centre of a
parallelepiped drawn around the main part of hand-held, suspended, or stand-type
appliances.
The centre of location is such that the centre of the appliance coincides with the centre of a
rectangle drawn around the projection of the main part of the appliance on the floor, for floor-
supported appliances, and on the wall, for wall-mounted appliances.
3.7
nominal height
h
n
the smallest integer multiple of 5 mm that accommodates the height of the installation opening
according to the manufacturer’s installation instructions
3.8
nominal width
w
n
the smallest integer multiple of 5 mm that accommodates the width of the installation opening
according to the manufacturer’s installation instructions
3.9
nominal depth
d
n
the smallest integer multiple of 5 mm, equal to or greater than 515 mm, that accommodates
the depth of the installation opening according to the manufacturer’s installation instructions
4 Measurement methods and acoustical environments
4.1 General
The total noise emitted by machinery or equipment and radiated in all directions to the space
surrounding the machine can be characterized by the sound power of the machine. The sound
power of a machine is essentially independent of the environment in which the machine is
installed.
Therefore, the concept of sound power level has been chosen for expressing the noise
emission of appliances for household and similar purposes.
The preferred noise emission quantity is the A-weighted sound power level, L , in decibels
WA
(ref. 1 pW).
According to this standard, two principal methods exist, the direct method and the comparison
method, as described in 4.2 and 4.3 below. These two methods can be used alternatively.
Different types of environments, as described in 4.4, may be used. A part 2 may, if necessary,
exclude one or several combinations among those available.
4.2 Direct method
The direct method can be used only for measurements in qualified test environments
according to ISO 3744 for free field conditions over reflecting plane(s), and according to ISO
3743-2 for special reverberation test rooms.
With this method, the sound power level is determined
– in free field conditions over reflecting plane(s), from time-averaged sound pressure levels
(on a mean-square basis) over the measurement surface and from the area of the
measurement surface;
60704-1 © IEC:2010 – 11 –
– in special reverberation test rooms, from averaged sound pressure levels, and from the
reverberation time and the volume of the test room.
This method yields results expressed in A-weighted sound power levels (and in octave-band
sound power levels, if required) which are calculated directly from measured sound pressure
levels.
NOTE This method can also be used in conjunction with more precise methods, as for instance as given in
ISO 3741 and ISO 3745.
4.3 Comparison method
The comparison method for measurement is explicitly described in ISO 3743-1 and in
ISO 3743-2.
NOTE The term “comparison method" is not explicitly given in ISO 3744, but when applying the “absolute
comparison test" for the determination of the environmental correction given in Clause A.3 of ISO 3744, by using a
reference sound source, the procedure is, in fact, a comparison method.
With this method, the sound power level is determined by comparing the averaged values (on
a mean-square basis) of the sound pressure levels produced by the source in the test room to
the averaged values of the sound pressure levels produced in the same room by a calibrated
reference sound source (RSS) of known sound power output, complying with the requirements
of ISO 6926. The difference in sound pressure levels is equal to the difference in sound power
levels when conditions are the same for both sets of measurements.
This method yields results expressed in octave-band sound power levels, and the A-weighted
sound power level is calculated from the octave-band sound power levels.
To check whether there is a systematic difference between results obtained in different
environments, the use of the comparison method is recommended.
4.4 Acoustical environments
4.4.1 General requirements and criterion for adequacy of the test environment
They are given in Clause 4 of
− ISO 3743-1 for hard-walled test rooms;
− ISO 3743-2 for special reverberation test rooms;
− ISO 3744  for free field conditions over reflecting plane.
NOTE For free field conditions over reflecting plane, the absolute comparison test for the qualification of the
environment, described in Clause A.3 of ISO 3744, is preferred.
Guidelines for the design of simple test rooms with free field conditions are given in Annex C
of this standard.
Guidelines for the design of a suitable special reverberation test room are given in Annex A of
ISO 3743-2.
4.4.2 Criterion for background noise level
Requirements for the background noise level are given in Clause 4 of ISO 3743-1, ISO 3743-2
and ISO 3744. Averaged over the microphone positions, the background noise level shall be
at least 6 dB below, and preferably more than 15 dB below the sound pressure level to be
measured.
NOTE If the difference between the sound pressure levels of the background noise and the appliance noise is
less than 6 dB, see 8.2.
– 12 – 60704-1 © IEC:2010
4.4.3 Environmental conditions
Environmental conditions having an adverse effect on the microphone used for the
measurements (for example, strong electric or magnetic fields, wind, impingement of air
discharge from the equipment being tested, high or low temperatures) shall be avoided by
proper selection or positioning of the microphone.
The instructions of the manufacturers of the measurement instruments regarding adverse
environmental conditions shall be followed. The microphone shall always be oriented in such
a way that the angle of incidence of the sound waves is that for which the microphone is
calibrated.
5 Instrumentation
5.1 Instrumentation for measuring acoustical data
Requirements for the instrumentation system and for its calibration are given in Clause 5 of
ISO 3743-1, ISO 3743-2 and ISO 3744.
The instrumentation system shall meet the requirements for a type 1 instrument laid down in
IEC 61672-1, according to the basic standard used. For measurements in octave bands, the
instrumentation system shall meet the requirements of IEC 61260.
Reference sound sources (RSS) shall meet the requirements of ISO 6926, and shall be
calibrated annually.
5.2 Instrumentation for measuring climatic conditions
5.2.1 The temperature is determined with instruments having an accuracy of ± 1 °C.
5.2.2 The relative humidity is determined with instruments having an absolute accuracy of
± 2 % within the measuring range.
5.3 Instrumentation for measuring operating conditions
5.3.1 The voltage at the plug of the cable or cord of mains-powered appliances is measured
with voltmeters having an accuracy of class 0,5 instruments.
5.3.2 The voltage at the battery terminals of battery-powered appliances is measured with
voltmeters having an accuracy of class 0,5 instruments.
5.3.3 The rotational speed of motors, attachments, etc. is measured, if necessary, with
speed indicators having an accuracy of ±1 % of full scale.
6 Operation and location of appliances under test
6.1 Equipping and pre-conditioning of appliances
6.1.1 The appliance is equipped with attachments, accessories, etc. as delivered by the
manufacturer for the intended use or function.
6.1.2 Care shall be taken to ensure that any auxiliary equipment (such as electrical conduits
or cables, piping for water supply or drainage, air ducts, etc.) necessary for the operation of
the appliance, does not radiate a significant amount of sound energy into the test environment
or change the sound output of the appliance. Guidelines are given in 6.4 of ISO 3743-1,
ISO 3743-2 and ISO 3744.
60704-1 © IEC:2010 – 13 –
6.1.3 Prior to noise measurements, the appliance, equipped as for intended use, shall have
been in operation long enough to prevent excessive noise due to parts not being run-in.
Running-in should take place at the highest speed setting, if any, and unless otherwise
stated, without load. The part 2 shall indicate the total period for running-in and the rated
operating times, unless the manufacturer has recommended otherwise.
6.1.4 Immediately before each series of noise measurements, the appliance, equipped as for
the intended use, is operated for stabilizing at the highest speed setting, if any and unless
otherwise stated, without load, as indicated in part 2 or according to the manufacturer's
instructions.
6.2 Supply of electric energy and of water or gas
6.2.1 Appliances with mains powered electric motor(s) are supplied at rated voltage and at
rated frequency. Appliances designed for DC only are supplied with DC. If a voltage range
and/or a frequency range are indicated, then the supply voltage and/or frequency shall be the
nominal system voltage and/or system frequency of the country in which the appliance is
intended to be used. Tolerances shall not exceed ±2 % for voltage and ±1 % for frequency
throughout the test.
The nominal system voltage and its values are defined in IEC 60038.
If the rated voltage of a mains supplied appliance differs from the nominal system voltage as
common in the country of use, measurements should be carried out at the nominal voltage as
common in the country of use.
The supply voltage is measured at the plug of a non-detachable cable or cord, or at the
appliance inlet if a detachable cable is provided, but in no case at the entrance of extension
cables or cords.
6.2.2 Appliances with battery-powered electric motor(s) are started, for noise
measurements, with full-charged batteries as specified by the manufacturer, and the
measurements are interrupted when the battery voltage under load has dropped for lead-acid
batteries to 0,9 times and for other batteries to 0,8 times the battery voltage under load at the
beginning of the test.
The battery voltage is measured at the battery terminals.
6.2.3 Appliances incorporating heating, either electric or gas, may be operated without
heating, if the heating does not change the noise emission of the appliance.
6.2.4 The water and/or gas supply, if any, shall be as specified by the manufacturer.
If not specified by the manufacturer, the water supply pressure shall be 240 kPa ± 50 kPa, the
temperature of cold water shall be +15 °C ± 2 °C and the temperature of hot water shall be
+55 °C ± 2 °C, unless otherwise specified in part 2.
NOTE When, in some countries, the water supply pressure/temperature differs from the water supply
pressure/temperature of the country concerned, measurements carried out at rated pressure/temperature may be
misleading for the consumer. In this case, additional measurements may be necessary. If the test
pressure/temperature differs from the rated pressure/temperature, this should be reported.
6.3 Climatic conditions
In general, household appliances (unless otherwise specified for a special family) are
operated under the following climatic conditions:
ambient temperature       t   = 23 °C ± 5 °C
relative humidity          RH = 50 % ± 20 %

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atmospheric pressure       p = 96 kPa ± 10 kPa
s
6.4 Loading and operating of appliances during tests
General requirements are given in 6.5 of ISO 3743-1, ISO 3743-2 and ISO 3744. For the
purpose of establishing a noise test code, the following guidelines are given, unless otherwise
specified in part 2.
6.4.1 In general, the loading and operating conditions should, as far as practicable, simulate
normal use but, in every case, preference has to be given to simple conditions providing a
satisfactory repeatability and reproducibility.
The presence of an operator should be avoided. An operator shall be present only if the
application of the load is not practicable without an operator.
6.4.2 For determining noise emission of an appliance, the loading and operating conditions,
if not specified for a particular category of appliances in part 2, shall be restricted to one
single condition, except for appliances with multiple main functions of long duration and for
multi-purpose appliances, where one or several conditions may be specified. However, the
specified condition shall be that which produces the highest noise emission value.
The idling condition may be chosen as the sole condition for determining noise emission of
the appliance if it is typical and steady and if the reproducibility with the loading condition is
poor.
For appliances provided with speed control, in general the highest speed setting is used.
6.4.3 Appliances operated during normal use in operational cycles are operated likewise for
determining noise emission, taking measurements during appropriate parts of the operational
cycles of the main functions.
NOTE It is recommended to record the A-weighted sound pressure level during the operational cycle(s) – time
history – at one of the microphone positions, preferably in front of the appliance to be tested.
6.4.4 When applying loading and operating conditions for determining noise emission, care
shall be taken to avoid possible overheating of the appliance under test. Rated operating and
resting times and/or the manufacturer's instructions shall be followed.
6.5 Location and mounting of appliances
The basic requirements of 6.2 and 6.3 of ISO 3743-1, ISO 3743-2 and ISO 3744 shall be
followed. For the purpose of establishing a noise test code the following guidelines are given,
unless otherwise specified in part 2.
6.5.1 Floor-standing appliances, counter-top or table-type appliances, are placed in normal
position directly, without any resilient means other than those
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