ISO 16032:2004

INTERNATIONAL ISO
STANDARD 16032
First edition
2004-09-15
Acoustics — Measurement of sound
pressure level from service equipment in
buildings — Engineering method
Acoustique — Mesurage du niveau de pression acoustique des
équipements techniques dans les bâtiments — Méthode d'expertise

Reference number
©
ISO 2004
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ii © ISO 2004 – All rights reserved

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.
ISO 16032 was prepared by the European Committee for Standardization (CEN) in collaboration with
Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Building acoustics, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
Throughout the text of this document, read “.this European Standard.” to mean “.this International
Standard.”.
Contents page
Foreword.v
Introduction .vi
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Instrumentation.4
5 Test method – General .5
6 Measurement procedure.6
7 Measurement of reverberation time.8
8 Correction for background noise.8
9 Precision.9
10 Test report .9
Annex A (normative) A-weighting and C-weighting correction value.11
Annex B (normative) Operating conditions and operating cycles for measuring the maximum sound
pressure level and the equivalent continuous sound pressure level .12
Bibliography .19
iv © ISO 2004 – All rights reserved

Foreword
This document (EN ISO 16032:2004) has been prepared by Technical Committee CEN/TC 126 “Acoustic
properties of building products and of buildings”, the secretariat of which is held by AFNOR, in collaboration with
Technical Committee ISO/TC 43 “Acoustics”.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by March 2005, and conflicting national standards shall be withdrawn at the latest by
March 2005.
This document includes a Bibliography.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,
Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Introduction
This document specifies the engineering method for the measurement of sound pressure level from service
equipment in buildings. For use of this document measurements are performed under specified operation
conditions and operating cycles. Such conditions are given in Annex B.
The operating conditions and operating cycles given in Annex B are only used if they are not opposed to national
requirements and regulations.
vi © ISO 2004 – All rights reserved

1 Scope
This document specifies methods for measuring the sound pressure level from service equipment in buildings
installed to building structures. This document covers specifically measurements of sanitary installations,
mechanical ventilation, heating and cooling service equipment, lifts, rubbish chutes, boilers, blowers, pumps and
other auxiliary service equipment, and motor driven car park doors, but can also be applied to other equipment
attached to or installed in buildings.
The methods are suitable for rooms with volumes of approximately 300 m or less in e.g. dwellings, hotels, schools,
offices and hospitals. The standard is not in general intended for measurements in large auditoria and concert halls.
However, the operating conditions and operating cycles in Annex B can be used in such cases.
The service equipment sound pressure level is determined as the maximum A- weighted and optionally C- weighted
sound pressure level occurring during a specified operation cycle of the service equipment under test, or as the
equivalent continuous sound pressure level determined with a specified integration time. A-weighted and
C- weighted values are calculated from octave-band measurements.
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.
EN 60942, Electroacoustics — Sound calibrators (IEC 60942:2003).
EN 61260, Electroacoustics — Octave-band and fractional-octave-band filters (IEC 61260:1995).
EN 61672-1, Electroacoustics - Sound level meters - Part 1: Specifications (IEC 61672-1:2002).
EN 61672-2, Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests (IEC 61672-2:2003).
EN ISO 3382, Acoustics - Measurement of the reverberation time of rooms with reference to other acoustical
parameters (ISO 3382:1997).
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
sound pressure level
L
ten times the logarithm to the base 10 of the ratio of the square of the sound pressure, p (t), to the square of the
reference sound pressure p , measured with a particular time weighting and a particular frequency weighting,
selected from those defined in EN 61672-1. It is expressed in decibels. The reference sound pressure is 20 µPa
3.2
average sound pressure level
L
n
 
0,1×L
i
 10 
∑
 i=1 
= 10 lg dB (1)
L
 
n
 
 
where
L is the sound pressure level at different microphone positions, in decibels, to be averaged
i
3.3
A- weighted sound pressure level calculated from octave-band values in the frequency range 63 Hz to
8 000 Hz
L
A
n
0,1( + )
Li Ai
= 10 lg  dB (2)
LA 10
∑
i=1
where
L is the sound pressure level in octave-band i, and A is the A-weighting correction for octave-band i
i i
(see Annex A). The value of L depends on the measurements, but can be all the parameters of 3.6
i
3.4
C- weighted sound pressure level calculated from octave-band values in the frequency range 31,5 Hz to
8 000 Hz
L
C
n
0,1( + )
Li Ci
= 10 lg  dB (3)
L 10
C
∑
i=1
where
L is the sound pressure level in octave-band i, and C is the C-weighting correction for octave-band i
i i
(see Annex A). The value of L depends on the measurements, but can be all the parameters of 3.6
i
2 © ISO 2004 – All rights reserved

3.5
sound exposure level
L
E
the sound exposure level of a sound event is given by the formula:
t
1 p (t)
= 10 lg  dt dB (4)
L
E
∫
t p
o
t
o
where
p(t) is the instantaneous sound pressure in Pascals;
t - t is a stated time interval long enough to encompass all significant sound of a stated event, in
2 1
seconds;
p is the reference sound pressure (20 µPa);
o
t is the reference duration (t = 1 s)
o o
3.6
service equipment sound pressure level in octave-bands in the frequency range 31,5 Hz to 8 000 Hz
in the following subclauses 3.6.1 to 3.6.9 are defined the octave-band values which can be measured according to
this document. See also Clause 5, Table 1
3.6.1
L
S max
maximum sound pressure level in octave-bands determined with time weighting “S”
3.6.2
L
S max, nT
maximum sound pressure level in octave-bands determined with time weighting “S” and standardized to a
reverberation time of 0,5 s (3.8, equation (5))
3.6.3
L
S max, n
maximum sound pressure level in octave-bands determined with time weighting “S” and normalized to an
equivalent sound absorption area of 10 m (3.8, equation (6))
3.6.4
L
F max
maximum sound pressure level in octave-bands determined with time weighting “F”
3.6.5
L
F max, nT
maximum sound pressure level in octave-bands determined with time weighting “F” and standardized to a
reverberation time of 0,5 s (3.8, equation (5))
3.6.6
L
F max, n
maximum sound pressure level in octave-bands determined with time weighting “F” and normalized to an
equivalent sound absorption area of 10 m (3.8, equation (6))
3.6.7
L
eq
equivalent continuous sound pressure level in octave-bands
3.6.8
L
eq, nT
equivalent continuous sound pressure level in octave-bands standardized to a reverberation time of 0,5 s (3.8,
equation (5))
3.6.9
L
eq, n
equivalent continuous sound pressure level in octave-bands normalized to an equivalent sound absorption area of
10 m (3.8, equation (6))
3.7
reverberation time
T
time that would be required for the sound pressure level to decrease by 60 dB after the sound source has stopped.
It is expressed in seconds
3.8
standardized/normalized sound pressure level
the measured sound pressure levels in octave-bands can be standardized to a reverberation time of 0,5 s or
normalized to an equivalent sound absorption area of 10 m . The equations (5) and (6), respectively, are used
T
= L - 10 lg dB (5)
L
nT
T
where
L can be L , L , L ;
S max F max eq
T is the measured reverberation time in seconds;
T = 0,5 s
T
A0
= L - 10 lg (6)
L
n
0,16 V
where
L can be L , L , L ;
S max F max eq
T is the measured reverberation time in seconds;
V is the room volume in cubic metres;
A is the reference equivalent sound absorption area in square metres; A = 10 m
0 0
 
s
 
0,16 has the unit .
m
 
 
4 Instrumentation
Measurement of the maximum sound pressure level according to this document implies the use of an octave-band
real-time frequency analyser. The analyser shall be able to read values of all octave-band sound pressure levels at
the time when the maximum A-weighted or C-weighted sound pressure level occurs (during a specified operating
cycle of the service equipment under test).
4 © ISO 2004 – All rights reserved
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