IEC 60704-2-13:2000/AMD1:2005

Amendment 1 - Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-13: Particular requirements for range hoods

Amendement 1 - Appareils électrodomestiques et analogues - Code d'essai pour la détermination du bruit aérien - Partie 2-13: Règles particulières pour les hottes de cuisine

General Information

• Status: Published
• Publication Date: 15-Dec-2005
• ICS: 17.140.20 - Noise emitted by machines and equipment
• ICS: 97.040.20 - Cooking ranges, working tables, ovens and similar appliances
• Technical Committee: TC 59 - Performance of household and similar electrical appliances
• Drafting Committee: JWG 2 - TC 59/JWG 2
• Current Stage: DELPUB - Deleted Publication
• Start Date: 27-Jan-2011
• Completion Date: 26-Oct-2025

Relations

• Amends: IEC 60704-2-13:2000 - Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-13: Particular requirements for range hoods
• Effective Date: 05-Sep-2023
• Revised: IEC 60704-2-13:2011 - Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-13: Particular requirements for range hoods
• Effective Date: 05-Sep-2023

Overview

IEC 60704-2-13:2000/AMD1:2005 Amendment 1 is an important update to the international standard for testing airborne acoustical noise emitted by household and similar electrical appliances, specifically focusing on range hoods. This amendment introduces the intensimetric method for determining sound power levels of range hoods, providing a precise approach for noise measurement. The IEC (International Electrotechnical Commission) technical committee 59, responsible for household electrical appliance performance standards, developed this amendment to ensure consistency and accuracy in acoustical noise testing.

Key Topics

• Intensimetric Method Introduction
  The amendment adds the intensimetric method, which calculates sound power by measuring the sound intensity normal to a defined surface around the range hood. This method complements existing measurement techniques without altering the base standard’s core text.

• Measurement Methods

  • Discrete Points Method: Measurement surface is divided into segments around the range hood. Sound intensity is measured at discrete grid points, and the total sound power is calculated by summing partial sound powers from each segment.
  • Scanning Method: Similar to the discrete points method but involves a continuous scan over the surface segments with sound intensity recorded continuously, enabling a space and time-averaged sound power calculation.

• Test Environment and Instrumentation
  The amendment sets requirements for the acoustical test environment and mandates the use of Class 1 sound intensity measurement instruments compliant with IEC 61043, ensuring high precision and reproducibility. The standard specifies that background noise must be significantly lower than the noise generated by the appliance for valid measurements.

• Measurement Procedures
  Detailed guidance is provided regarding the placement, mounting, and height of the range hood during testing, emphasizing support by resilient means to avoid interference. The standard defines how to verify sound field stationarity and qualify test results based on calculated field indicators and measurement uncertainty.

• Calculation and Reporting
  Formulae for calculating partial sound powers and overall A-weighted sound power levels are specified. The recommendation includes recording measurement data such as field indicators, sound power levels by frequency band, measurement surface geometry, averaging times, and scan parameters. Consistent reporting ensures transparency and comparability.

Applications

• Noise Emission Testing for Range Hoods
  Manufacturers and testing laboratories apply this amendment to quantify the acoustical noise emitted by household range hoods accurately, aiding compliance with regulations and customer expectations for quieter appliances.

• Product Development and Quality Control
  The intensimetric method supports appliance designers by providing reliable sound power data, enabling improvements in noise reduction technologies during development cycles.

• Certification and Standardization
  Compliance with IEC 60704-2-13 Amendment 1 ensures that range hoods meet international acoustic noise standards, which facilitates market access and product certification globally.

• Research on Acoustical Noise in Household Appliances
  The standard’s detailed measurement and reporting procedures support scientific research into noise characteristics, contributing to innovation in noise mitigation strategies.

Related Standards

• IEC 61043:1993 - Electroacoustics: Instruments for the Measurement of Sound Intensity, establishing requirements for measurement instruments used in accordance with this standard.
• ISO 9614-1:1993 - Acoustics: Determination of Sound Power Levels using Sound Intensity, Part 1: Measurement at Discrete Points, which provides the framework followed in the discrete points measurement method.
• ISO 9614-2:1996 - Acoustics: Determination of Sound Power Levels using Sound Intensity, Part 2: Measurement by Scanning, which underpins the scanning method presented in the amendment.
• IEC 60942 - Electroacoustics: Sound Calibrators, relevant for ensuring the accuracy of sound measurement equipment.

---

By following IEC 60704-2-13:2000/AMD1:2005, professionals in the electrical appliance industry can reliably assess and report the airborne acoustical noise generated by range hoods, ensuring quieter, more consumer-friendly kitchen solutions. The amendment’s emphasis on the intensimetric method enhances measurement versatility and fosters international harmonization in appliance noise testing.

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD 60704-2-13
AMENDMENT 1
2005-12
Amendment 1
Household and similar electrical appliances –
Test code for the determination
of airborne acoustical noise –
Part 2-13:
Particular requirements for range hoods

 IEC 2005 Droits de reproduction réservés  Copyright - all rights reserved
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale K

International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 60704-2-13 Amend. 1  IEC:2005(E)

FOREWORD
This amendment has been prepared by IEC technical committee 59: Performance of

household electrical appliances.

The text of this amendment is based on the following documents:

FDIS Report on voting
59/422/FDIS 59/432A/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result 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.
_____________
INTRODUCTION
This amendment introduces a description of the intensimetric method for the determination of
sound power levels of range hoods in addition to the other methods described in the standard,
for the use of which the text of IEC 60704-2-13 remains unchanged. According to the method
described here, the sound power level is obtained by measuring the component of sound
intensity normal to a measurement surface that surrounds the range hood.
Page 3
CONTENTS
Add, after the listing for Annex AA, the title of the new bibliography as follows:
Bibliography
Page 11
1 Scope and object
1.1.1 General
Add, to the existing text, the following new paragraph:
Intensimetric method for the determination of sound power levels shall not be used for the
purpose of verification.
60704-2-13 Amend. 1  IEC:2005(E) – 3 –

1.1.2 Types of noise
Replace the existing text of the addition by the following new text:

Addition:
The method is applicable to any source for which a physically stationary measurement

surface can be defined, and on which the noise generated by the source is stationary in time

(as defined in Clause 3), therefore it is not suitable for sources of impulsive noise consisting

of short duration noise bursts. This method is not suitable if the source under test has

significant noise over 6,3 kHz in one-third-octave band centre frequencies and over 4 kHz in

one-octave band centre frequencies.
1.1.3 Size of the source
Replace the existing text of the replacement by the following new text:
Replacement:
The size of the noise source is unrestricted. The extent of the source is defined by the choice
of the measurement surface.
Page 13
Add the following subclause:
1.3 Measurement uncertainty
Replacement:
The uncertainty in the determination of the sound power level of a noise source is related:
– to the nature of the sound field of the source;
– to the nature of the extraneous sound field;
– to the absorption of the source under test;
– to the type of intensity-field sampling and measurement procedure employed.
The normal range for A-weighted data is covered by the one-octave bands from 63 Hz to
4 kHz, and the one-third-octave bands from 50 Hz to 6,3 kHz. The estimated values of
standard deviations of sound power levels, determined according to this standard for both the

discrete points method and the scanning method are as indicated in Table 101.
Table 101 – Standard deviations of sound power levels
Standard deviation (dB)
σ (repeatability) σ (reproducibility)
r R
1,5 2,0
– 4 – 60704-2-13 Amend. 1  IEC:2005(E)

2 Normative references
Add the following new references:

IEC 61043:1993, Electroacoustics – Instruments for the measurement of sound intensity –

Measurement with pairs of pressure sensing microphones

ISO 9614-1:1993, Acoustics – Determination of sound power levels of noise sources using

sound intensity – Part 1: Measurement at discrete points

ISO 9614-2:1996, Acoustics – Determination of sound power levels of noise sources using
sound intensity – Part 2: Measurement by scanning
3 Terms and definitions
Add the following definition:
3.1
terms and definitions pertinent to determination of sound power levels

Replacement:
These may be found in ISO 9614-1 and ISO 9614-2.

Page 15
4 Measurement methods and acoustical environments
Add the following subclause:
4.1 General
Replacement:
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, in decibels (re.
1 pW).
According to this standard, one method is used, the direct method as described in 4.2 below.
4.2 Direct method
Replace the existing text of the addition with the following new text:

60704-2-13 Amend. 1  IEC:2005(E) – 5 –

Addition:
The measurement can be performed according to two intensimetric methods, the "discrete
points method" and the "scanning method", as described below.

4.2.101 Discrete points method

Define, as the measurement surface, a parallelepiped-shaped surface around the range hood;

then divide it in partial areas (segment) so as to obtain a grid. The dimension of the

parallelepiped depends on the dimension of the range hood: the distance between each face

of the parallelepiped and the range hood under test depends on the value of F and F
2 3
indicators (see annexes A and B of ISO 9614-1) but shall be at least 10 cm. The density of
measurement positions on parallelepiped faces depends on extraneous noise and on the
value of the F indicator (see annexes A and B of ISO 9614-1). The total sound power of the
source is obtained from calculation of the partial sound power of each segment of the
parallelepiped, by multiplying the "local" intensity sound by its partial area, and then by
adding all the partial sound powers (absolute value).
4.2.102 Scanning method
This method is very similar to the previous one (4.2.101), with the only difference being that
each face of the parallelepiped is not divided in partial areas, but is continuously scanned with
the intensimetric probe, and the space and time average of intensity sound is multiplied by its
area; then the total sound power of the range hood is obtained by adding the partial sound
powers of each face of the parallelepiped.
NOTE The distance of 20 cm between each face of the parallelepiped and the range hood is usually acceptable.
4.3 Comparison method
Replace the existing text of the addition with the following new text:
Not applicable.
Add the following subclauses:
4.4 Acoustical environments
4.4.1 General requirements and criterion for adequacy of the test environment
Replacement:
For the discrete points method, the general requirements and criterion for adequacy of the
test environment are given in Clauses 4 and 5 of ISO 9614-1.
For the scanning method, they are given in Clauses 4 and 5 of ISO 9614-2.
4.4.2 Criterion for background noise level
Not applicable.
– 6 – 60704-2-13 Amend. 1  IEC:2005(E)

5 Instrumentation
5.1 Instrumentation for measuring acoustical data

Add, to the existing addition, the following new paragraphs:

Sound intensity measurement instruments and probes that meet the requirements of

IEC 61043 shall be used. Class 1 instruments shall be used.

To check the instrumentation for proper operation prior to each series of measurements, the

field-check procedure specified by the manufacturer shall be applied.
6 Operation and location of appliances under test
Page 17
6.5 Location and mounting of appliances
6.5.1 Replace the existing text of the replacement with the following:
Replacement:
Range hoods not intended to be placed against a wall shall be supported by resilient means
(examples are given in Figure 102 of IEC 60704-2-13). Care shall be taken in order to avoid
any kind of interference between the supports an
...

IEC 60704-2-13
Edition 1.0 2005-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-13: Particular requirements for range hoods

Appareils électrodomestiques et analogues – Code d'essai pour la détermination
du bruit aérien –
Partie 2-13: Règles particulières pour les hottes de cuisine

IEC 60704-2-13 A1:2005
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IEC 60704-2-13
Edition 1.0 2005-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-13: Particular requirements for range hoods

Appareils électrodomestiques et analogues – Code d'essai pour la détermination
du bruit aérien –
Partie 2-13: Règles particulières pour les hottes de cuisine

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
K
CODE PRIX
ICS 17.140.20; 97.040.20 ISBN 2-8318-9538-3
– 2 – 60704-2-13 Amend. 1 © IEC:2005
FOREWORD
This amendment has been prepared by IEC technical committee 59: Performance of
household electrical appliances.
This bilingual version, published in 2008-01, corresponds to the English version.
The text of this amendment is based on the following documents:
FDIS Report on voting
59/422/FDIS 59/432A/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The French version of this amendment has not been voted upon.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result 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.
_____________
INTRODUCTION
This amendment introduces a description of the intensimetric method for the determination of
sound power levels of range hoods in addition to the other methods described in the standard,
for the use of which the text of IEC 60704-2-13 remains unchanged. According to the method
described here, the sound power level is obtained by measuring the component of sound
intensity normal to a measurement surface that surrounds the range hood.

Page 3
CONTENTS
Add, after the listing for Annex AA, the title of the new bibliography as follows:
Bibliography
60704-2-13 Amend. 1 © IEC:2005 – 3 –
Page 11
1 Scope and object
1.1.1 General
Add, to the existing text, the following new paragraph:
Intensimetric method for the determination of sound power levels shall not be used for the
purpose of verification.
1.1.2 Types of noise
Replace the existing text of the addition by the following new text:
Addition:
The method is applicable to any source for which a physically stationary measurement
surface can be defined, and on which the noise generated by the source is stationary in time
(as defined in Clause 3), therefore it is not suitable for sources of impulsive noise consisting
of short duration noise bursts. This method is not suitable if the source under test has
significant noise over 6,3 kHz in one-third-octave band centre frequencies and over 4 kHz in
one-octave band centre frequencies.
1.1.3 Size of the source
Replace the existing text of the replacement by the following new text:
Replacement:
The size of the noise source is unrestricted. The extent of the source is defined by the choice
of the measurement surface.
Page 13
Add the following subclause:
1.3 Measurement uncertainty
Replacement:
The uncertainty in the determination of the sound power level of a noise source is related:
– to the nature of the sound field of the source;
– to the nature of the extraneous sound field;
– to the absorption of the source under test;
– to the type of intensity-field sampling and measurement procedure employed.
The normal range for A-weighted data is covered by the one-octave bands from 63 Hz to
4 kHz, and the one-third-octave bands from 50 Hz to 6,3 kHz. The estimated values of
standard deviations of sound power levels, determined according to this standard for both the
discrete points method and the scanning method are as indicated in Table 101.

– 4 – 60704-2-13 Amend. 1 © IEC:2005
Table 101 – Standard deviations of sound power levels
Standard deviation (dB)
σ (repeatability) σ (reproducibility)
r R
1,5 2,0
2 Normative references
Add the following new references:
IEC 61043:1993, Electroacoustics – Instruments for the measurement of sound intensity –
Measurement with pairs of pressure sensing microphones
ISO 9614-1:1993, Acoustics – Determination of sound power levels of noise sources using
sound intensity – Part 1: Measurement at discrete points
ISO 9614-2:1996, Acoustics – Determination of sound power levels of noise sources using
sound intensity – Part 2: Measurement by scanning
3 Terms and definitions
Add the following definition:
3.1
terms and definitions pertinent to determination of sound power levels
Replacement:
These may be found in ISO 9614-1 and ISO 9614-2.

Page 15
4 Measurement methods and acoustical environments
Add the following subclause:
4.1 General
Replacement:
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, in decibels (re.
1 pW).
According to this standard, one method is used, the direct method as described in 4.2 below.

60704-2-13 Amend. 1 © IEC:2005 – 5 –
4.2 Direct method
Replace the existing text of the addition with the following new text:
Addition:
The measurement can be performed according to two intensimetric methods, the "discrete
points method" and the "scanning method", as described below.
4.2.101 Discrete points method
Define, as the measurement surface, a parallelepiped-shaped surface around the range hood;
then divide it in partial areas (segment) so as to obtain a grid. The dimension of the
parallelepiped depends on the dimension of the range hood: the distance between each face
of the parallelepiped and the range hood under test depends on the value of F and F
2 3
indicators (see Annexes A and B of ISO 9614-1) but shall be at least 10 cm. The density of
measurement positions on parallelepiped faces depends on extraneous noise and on the
value of the F indicator (see Annexes A and B of ISO 9614-1). The total sound power of the
source is obtained from calculation of the partial sound power of each segment of the
parallelepiped, by multiplying the "local" intensity sound by its partial area, and then by
adding all the partial sound powers (absolute value).
4.2.102 Scanning method
This method is very similar to the previous one (4.2.101), with the only difference being that
each face of the parallelepiped is not divided in partial areas, but is continuously scanned with
the intensimetric probe, and the space and time average of intensity sound is multiplied by its
area; then the total sound power of the range hood is obtained by adding the partial sound
powers of each face of the parallelepiped.
NOTE The distance of 20 cm between each face of the parallelepiped and the range hood is usually acceptable.
4.3 Comparison method
Replace the existing text of the addition with the following new text:
Not applicable.
Add the following subclauses:
4.4 Acoustical environments
4.4.1 General requirements and criterion for adequacy of the test environment
Replacement:
For the discrete points method, the general requirements and criterion for adequacy of the
test environment are given in Clauses 4 and 5 of ISO 9614-1.
For the scanning method, they are given in Clauses 4 and 5 of ISO 9614-2.
4.4.2 Criterion for background noise level
Not applicable.
– 6 – 60704-2-13 Amend. 1 © IEC:2005
5 Instrumentation
5.1 Instrumentation for measuring acoustical data
Add, to the existing addition, the following new paragraphs:
Sound intensity measurement instruments and probes that meet the requirements of
IEC 61043 shall be used. Class 1 instruments shall be used.
To check the instrumentation for proper operation prior to each series of measurements, the
field-check procedure specified by the manufacturer shall be applied.
6 Operation and location of appliances under test

Page 17
6.5 Location and mounting of appliances
6.5.1 Replace the existing text of the replacement with the following:
Replacement:
Range hoods not intended to be placed against a wall shall be supported by resilient means
(examples are given in Figure 102 of IEC 60704-2-13). Care shall be taken in order to avoid
any kind of interference between the supports and air intake of appliance under test.
The lower edge of the appliance shall be placed at a height of 0,6 m from the horizontal
reflecting plane or from the floor of the test room.
The reference grid shall enclose the standard stand shown in Figure 102 and the range hood
under test. This parallelepiped-shaped reference surface shall be placed on the floor.

Page 19
6.5.4 Replace the existing text of the replacement with the following:
Replacement:
Range hoods intended to be placed against a wall shall be supported by resilient means
without any contact with the vertical wall (examples are given in Figure 102). Care shall be
taken in order to avoid any kind of interference between the supports and air intake of
appliance under test.
The lower edge of the appliance shall be placed at a height of 0,6 m from the horizontal
reflecting plane or from the floor of the test room. The rear edge of the range hood shall be
placed at a distance of 1 cm from the second vertical reflecting plane.
The reference grid shall enclose the standard stand shown in Figure 102 and the range hood
under test. This parallelepiped-shaped reference surface shall be placed on the floor. The
vertical reflecting plane and the horizontal reflecting plane or the floor enclosed in the
reference surface shall have an absorption coefficient α less than 0,06.

60704-2-13 Amend. 1 © IEC:2005 – 7 –
Page 21
7 Measurement of sound pressure levels
Replace the totality of this clause as follows:
7 Measurement of sound pressure levels
This clause of Part 1 is replaced as follows:
7 Measurement of normal sound intensity component levels
7.1 Initial test
7.1.1 Discrete points method
Choose a typical measurement position on the initial measurement surface for the
assessment of whether the sound field is stationary or not. With the appliance under test
turned on, calculate indicator F for all frequency bands of measurement according to A.2.1 of
Annex A of ISO 9614-1. The temporal variability of the sound field shall not exceed the values
specified in Table B.3 in Annex B of ISO 9614-1.
Extraneous noise is insignificant if A-weighted sound pressure levels measured at five
positions (distributed reasonably uniformly over the measurement surface) fall by at least
20 dB when the source is turned off.
Calculate the field indicators F , F and F for all frequency bands of measurement according
2 3 4
to Annex A of ISO 9614-1, and introduce them into the formulae given for the qualification
procedure of B.1.1 of Annex B of ISO 9614-1. When this requirement is fulfilled for each
frequency band, the initial sound power determination is qualified as a final result within the
range of uncertainty given in 1.3.
7.1.2 Scanning method
Make two separate scans (the two individual scan paths shall be orthogonal) on each
segment of the measurement surface, and separately record the partial sound power levels
L and L according to 9.2 of ISO 9614-2 for all frequency bands of measurement. The
wi(1) wi(2)
values shall fulfill criterion 3 of B.1.3 in ISO 9614-2.
Evaluate indicator F for all frequency bands of measurement according to equation (A.1) of
pl
A.2.1 of Annex A of ISO 9614-2 and introduce the values into the formula given for
qualification procedure B.1 of Annex B of ISO 9614-2. F shall be less than 20 dB.
pl
Evaluate indicator F for all frequency bands of measurement according to equation (A.2) of
+/–
A.2.2 of Annex A of ISO 9614-2 and introduce the values into the formula given for the
qualification procedure of B.1.2 of Annex B of ISO 9614-2.
7.2 Measurements
7.2.1 Discrete points method
When the preliminary tests described in 7.1 have been carried out, measure the normal
component of sound intensity in each frequency band of interest and for each segment of
parallelepiped-shaped grid. The probe shall be placed normal to the surface. The "local"
value, I , is obtained by time integration of the acoustic signal over a period of at least 20 s.
ni
– 8 – 60704-2-13 Amend. 1 © IEC:2005
7.2.2 Scanning method
Carry out scanning either manually or by means of a mechanized traversing system. The
extraneous intensity generated by this mechanism, as measured by the probe, shall be at
least 20 dB lower than the one generated by the appliance on the measurement surface.
Move the intensity probe continuously along specified paths on each segment of the selected
measurement surface. The basic element of a scan is a single straight line. The duration of
each scan over an individual segment shall not be less than 20 s. Initiate time averaging at
the beginning of the scan over each segment and terminate it at the completion of the scan of
the segment.
8 Calculation of sound pressure and sound power levels
Replace the totality of this clause as follows:
8 Calculation of sound pressure and sound power levels
This clause of Part 1 is replaced as follows:
8 Calculation of sound intensity and sound power levels
8.1 Calculation of partial sound powers for each segment of surface
Calculate a partial A-weighted sound power, P , for each segment of the measurement surface
i
from the equation:
P = I ⋅ S
i ni i
where
P is the partial A-weighted sound power for segment i given by the sum of all the sound
i
power levels found in each frequency band;
I
is the sum of A-weighted normal intensity components in all frequency bands of interest
ni
for segment i:
Discrete points method: is the signed magnitude of the normal sound intensity
component measured at position i on the measurement
surface;
Scanning method: is the mean segment-average normal sound intensity
component measured on segment i of the measurement
surface:
I = [I (1) + I (2)]/2
ni ni ni
and I (1) and I (2) are the values of I obtained from two
ni ni ni
separate scans of segment i;
S is the area of segment i.
i
Where the normal sound intensity component level, L at position i is expressed as XX dB,
Ini,
the value of I shall be calculated from the equation:
ni
XX/10
I = I x 10
ni 0
L at position i is expressed as (-)
Where the normal sound intensity component level,
Ini,
XX dB, the value of I shall be calculated from the equation:
ni
XX/10
I = –I x 10
ni 0
–12 2
In these equations I = 10 W/m
60704-2-13 Amend. 1 © IEC:2005 – 9 –
8.2 Calculation of the sound power level of range hood
Calculate the A-weighted sound power level of the noise source from the equation:
N
⎛ ⎞
⎜ ⎟
L = 10log P / P dB (Ref. 1pW)
WA ∑ i 0
⎜ ⎟
i=1
⎝ ⎠
where
P is the partial A-weighted sound power for segment i;
i
–12
P is the reference sound power (= 10 W);
N is the total number of measurement positions and segment.
N
If
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