IEC 60704-1:2021

Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 1: General requirements

IEC 60704-1:2021

Name:IEC 60704-1:2021   Standard name:Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 1: General requirements
Standard number:IEC 60704-1:2021   language:English language
Release Date:10-Mar-2021   technical committee:TC 59 - Performance of household and similar electrical appliances
Drafting committee:JWG 2 - TC 59/JWG 2   ICS number:13.120 - Domestic safety

IEC 60704-1
Edition 4.0 2021-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Test code for the determination
of airborne acoustical noise –
Part 1: General requirements




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IEC 60704-1
Edition 4.0 2021-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Test code for the determination

of airborne acoustical noise –

Part 1: General requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.120; 97.170 ISBN 978-2-8322-9571-7

– 2 – IEC 60704-1:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope and object . 7
1.1 Scope .
1.1.1 General .
1.1.2 Types of noise .
1.1.3 Size of the source .
1.2 Object .
1.3 Measurement uncertainty .
2 Normative references . 8
3 Terms and definitions . 9
4 Measurement methods and acoustical environments . 11
4.1 General . 11
4.2 Direct method . 11
4.3 Comparison method . 12
4.4 Acoustical environments . 12
4.4.1 General requirements and criterion for adequacy of the test
environment . 12
4.4.2 Criterion for background noise level . 13
4.4.3 Environmental conditions . 13
4.5 Measurement uncertainties . 13
4.5.1 General . 13
4.5.2 Standard deviations on repeatability and reproducibility and standard
deviations related to declaration and verification . 13
5 Instrumentation . 14
5.1 Instrumentation for measuring acoustical data . 14
5.2 Instrumentation for measuring climatic conditions . 14
5.3 Instrumentation for measuring operating conditions . 14
6 Operation and location of appliances under test . 15
6.1 Equipping and pre-conditioning of appliances . 15
6.2 Supply of electric energy and of water or gas . 15
6.3 Climatic conditions . 16
6.4 Loading and operating of appliances during tests . 16
6.5 Location and mounting of appliances . 17
7 Measurement of sound pressure levels . 19
7.1 Microphone array, measurement surface and RSS location for essentially
free field conditions over reflecting plane(s) . 19
7.2 Microphone array and RSS location in hard-walled test rooms . 19
7.3 Microphone array and RSS location in special reverberation test rooms . 29
7.4 Measurements . 29
8 Calculation of sound pressure and sound power levels . 30
8.1 General . 30
8.2 Corrections for background noise levels . 30
8.3 Corrections for the test environment . 31
8.4 Calculation of sound pressure level averaged over the microphone positions . 31
8.5 Calculation of sound power levels with the comparison method . 31

8.6 Calculation of sound power levels in free field conditions over a reflecting
plane . 32
8.7 Calculation of A-weighted sound power level with the direct method in
special reverberation test rooms . 32
9 Information to be recorded . 33
9.1 General data . 33
9.2 Description of appliance under test . 33
9.3 Measurement method . 33
9.4 Acoustical test environment . 34
9.5 Instrumentation . 34
9.6 Equipment and pre-conditioning of appliance under test . 34
9.7 Electric supply, water supply, etc. . 34
9.8 Climatic conditions . 34
9.9 Operation of the appliance under test . 35
9.10 Location and mounting of the appliance under test. 35
9.11 Microphone array . 35
9.12 Measurement data . 35
9.13 Calculated sound pressure and sound power levels . 36
9.14 Reporting . 36
10 Information to be reported . 36
10.1 General data . 36
10.2 Appliance under test . 36
10.3 Test conditions for the appliance . 36
10.4 Acoustical data . 37
Annex A (normative) Standard test table . 38
Annex B (normative) Test enclosure . 39
Annex C (informative) Guidelines for the design of simple test rooms with essentially

free field conditions. 40
Bibliography . 41

Figure 1 – Measurement surface – parallelepiped – with key microphone positions, for
floor free-standing appliances . 22
Figure 2 – Measurement surface – parallelepiped – with key microphone positions, for
floor standing appliances placed against a wall . 23
Figure 3 – Measurement surface – parallelepiped – with key microphone positions, for

high floor-standing appliances placed against a wall . 24
Figure 4 – Measurement surface – hemisphere – with key microphone positions, for
hand-held, table type and floor-treatment appliances . 25
Figure 5 – Measurement surface – quarter-sphere – with key microphone positions, for
small floor-standing appliances placed against a wall . 26
Figure 6 – Measurement surface – parallelepiped – with five or nine microphone

positions for stand-type appliances . 28
Figure A.1 – Example of standard test table . 38
Figure B.1 – Test enclosure . 39

Table 1 – Standard deviations of sound power levels . 14
Table 2 – Standard deviations for declaration and verification . 14

– 4 – IEC 60704-1:2021 RLV © IEC 2021
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
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subjec
...

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