Acoustics - Determination of occupational noise exposure - Engineering method (ISO 9612:2009)

Revision of the International Standard ISO 9612 is going on in ISO/TC 43/SC 1/WG 53. A parallel CEN/ISO voting procedure is proposed in conformity with the Vienna agreement. The enclosed 2nd committee draft, ISO/CD 9612, doc. 43/1 N 1649, specifies an
engineering method for measuring workers’ exposure to noise in a working environment and calculating the noise exposure level. The draft standard describes chronological steps for starting with work analysis. Use of different strategies for noise measurement is
allowed depending on the purpose of the tests. The method will be useful where an assessment of noise exposure to engineering grade precision is required, for example, for detailed noise exposure studies or epidemiological studies in to the cause of hearing damage.
The measuring process requires observation and analysis of the noise exposure conditions so that the quality of the measurements can be controlled. This Standard provides methods for estimating the uncertainty of the results. This Standard is not intended for assessment of masking of oral communication or assessment of infrasound, ultrasound and non-auditory effects of noise. It does not apply to the measurement of the noise exposure of the protected ear when hearing protectors are worn. Results of the measurements performed in accordance with this International Standard may provide useful information when defining priorities for noise control measures.

Akustik - Bestimmung der Lärmexposition am Arbeitsplatz - Verfahren der Genauigkeitsklasse 2 (Ingenieurverfahren) (ISO 9612:2009)

Diese Internationale Norm legt ein Verfahren der Genauigkeitsklasse 2 fest, um die Lärmbelastung von Beschäftigten am Arbeitsplatz zu erfassen und den Lärmexpositionspegel zu berechnen. Diese Internationale Norm behandelt die Messung von A-bewerteten Pegeln, ist aber ebenso auf C-bewertete Pegel anwendbar. Es werden drei verschiedene Messstrategien festgelegt. Die Anwendung dieses Verfahrens ist zweckmäßig, wenn die Ermittlung der Lärmexposition entsprechend der Genauigkeitsklasse 2 gefordert ist, z. B. für genaue Lärmbelastungsstudien oder epidemiologische Studien im Zusammenhang mit der Entstehung von Gehör¬schäden oder anderen negativen Lärmwirkungen.
Die Durchführung der Messung erfordert die Beobachtung und Analyse der Lärmbelastungsbedingungen, so dass die Qualität der Messungen überprüft werden kann. Diese Internationale Norm beschreibt Methoden zur Abschätzung der Unsicherheit der Ergebnisse.
Diese Internationale Norm ist nicht dafür vorgesehen, die Verdeckung von Sprache zu untersuchen oder Infraschall, Ultraschall und extraaurale Wirkungen von Lärm zu beurteilen. Sie ist nicht geeignet, um die Lärmbelastung des durch Gehörschützer geschützten Ohres zu messen.
Die Ergebnisse der Messungen, die in Übereinstimmung mit dieser Internationalen Norm durchgeführt wurden, können nützliche Informationen für die Festlegung von Prioritäten bei Lärmminderungsmaßnahmen liefern.

Acoustique - Détermination de l'exposition au bruit en milieu de travail - Méthode d'expertise (ISO 9612:2009)

L'ISO 9612:2009 spécifie une méthode d'expertise permettant de mesurer l'exposition au bruit des travailleurs dans un environnement de travail et de calculer le niveau d'exposition au bruit. Elle traite des niveaux pondérés A, mais est également applicable aux niveaux pondérés C. Trois stratégies de mesurage différentes sont spécifiées. La méthode est utile lorsque l'exposition au bruit doit être déterminée avec une classe d'expertise, par exemple pour des études détaillées d'exposition au bruit ou pour des études épidémiologiques relatives à une détérioration de l'audition ou d'autres effets nocifs.
Le processus de mesurage nécessite une observation et une analyse des conditions d'exposition au bruit permettant le contrôle de la qualité des mesurages. L'ISO 9612:2009 fournit des méthodes permettant d'estimer l'incertitude des résultats.
L'ISO 9612:2009 n'est pas destinée à l'évaluation du masquage de la communication parlée ni à l'évaluation des effets des infrasons, des ultrasons et des effets non auditifs du bruit. Elle ne s'applique pas au mesurage de l'exposition au bruit de l'oreille lorsqu'elle est munie de protecteurs individuels contre le bruit.
Les résultats des mesurages effectués conformément à l'ISO 9612:2009 peuvent fournir des informations utiles lors de la définition des priorités en matière de mesures de réduction du bruit.

Akustika - Določanje izpostavljenosti hrupu v delovnem okolju - Inženirska metoda (ISO 9612:2009)

Ta mednarodni standard določa inženirsko metodo za merjenje izpostavljenosti delavcev hrupu v delovnem okolju ter za izračun ravni izpostavljenosti hrupu. Ta mednarodni standard obravnava A-vrednotene ravni, vendar se uporablja tudi za C-vrednotene ravni. Navaja tri različne strategije merjenja. Metoda se uporablja, kadar je potrebno ugotavljanje izpostavljenosti hrupu na inženirski stopnji, npr. za podrobne študije izpostavljenosti hrupu ali za epidemiološke študije o poškodbi sluha ali drugih škodljivih posledic. Obravnavani merilni postopek zahteva opazovanje in analize razmer pri izpostavljenosti hrupu, tako da je mogoče nadzorovati kakovost meritev. Ta mednarodni standard določa metode za ocenjevanje negotovosti rezultatov. Ta mednarodni standard ni namenjen oceni motenj pri govorni komunikaciji ali za ocenjevanje infrazvoka, ultrazvoka ali učinkov hrupa, ki ne vplivajo na sluh. Ne uporablja se za merjenje izpostavljenosti ušesa hrupu pri uporabi osebne varovalne opreme za varovanje sluha. Rezultati meritev, opravljenih v skladu s tem mednarodnim standardom, lahko dajo uporabne podatke za določanje prednostnega reda pri ukrepih za obvladovanje hrupa.

General Information

Status
Published
Public Enquiry End Date
19-Aug-2007
Publication Date
11-Jun-2009
Technical Committee
Current Stage
6100 - Translation of adopted SIST standards (Adopted Project)
Start Date
16-Feb-2012
Due Date
14-Feb-2013
Completion Date
20-Jun-2013

Relations

Buy Standard

Standard
EN ISO 9612:2009 - K standardu spada še Excel datoteka za izračune (Angleški dodatek k SIST EN ISO 9612:2009, zip-file)
English language
51 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day
Standard – translation
EN ISO 9612:2009 - K standardu spada še Excel datoteka za izračune (Slovenski dodatek k SIST EN ISO 9612:2009)
Slovenian language
47 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day
Draft
prEN ISO 9612:2007
English language
55 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 9612:2009
01-julij-2009
1DGRPHãþD
SIST ISO 9612:1998
$NXVWLND'RORþDQMHL]SRVWDYOMHQRVWLKUXSXYGHORYQHPRNROMX,QåHQLUVNDPHWRGD
,62
Acoustics - Determination of occupational noise exposure - Engineering method (ISO
9612:2009)
Akustik - Bestimmung der Lärmexposition am Arbeitsplatz - Verfahren der
Genauigkeitsklasse 2 (Ingenieurverfahren) (ISO 9612:2009)
Acoustique - Détermination de l'exposition au bruit en milieu de travail - Méthode
d'expertise (ISO 9612:2009)
Ta slovenski standard je istoveten z: EN ISO 9612:2009
ICS:
13.140 Vpliv hrupa na ljudi Noise with respect to human
beings
SIST EN ISO 9612:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN ISO 9612:2009

---------------------- Page: 2 ----------------------

SIST EN ISO 9612:2009
EUROPEAN STANDARD
EN ISO 9612
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2009
ICS 13.140
English Version
Acoustics - Determination of occupational noise exposure -
Engineering method (ISO 9612:2009)
Acoustique - Détermination de l'exposition au bruit en Akustik - Bestimmung der Lärmexposition am Arbeitsplatz -
milieu de travail - Méthode d'expertise (ISO 9612:2009) Verfahren der Genauigkeitsklasse 2 (Ingenieurverfahren)
(ISO 9612:2009)
This European Standard was approved by CEN on 5 March 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9612:2009: E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------

SIST EN ISO 9612:2009
EN ISO 9612:2009 (E)
Contents Page
Foreword .3

2

---------------------- Page: 4 ----------------------

SIST EN ISO 9612:2009
EN ISO 9612:2009 (E)
Foreword
This document (EN ISO 9612:2009) has been prepared by Technical Committee ISO/TC 43 "Acoustics" in
collaboration with Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DS.
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 October 2009, and conflicting national standards shall be withdrawn at
the latest by October 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 9612:2009 has been approved by CEN as a EN ISO 9612:2009 without any modification.

3

---------------------- Page: 5 ----------------------

SIST EN ISO 9612:2009

---------------------- Page: 6 ----------------------

SIST EN ISO 9612:2009

INTERNATIONAL ISO
STANDARD 9612
Second edition
2009-04-01


Acoustics — Determination of
occupational noise exposure —
Engineering method
Acoustique — Détermination de l'exposition au bruit en milieu de
travail — Méthode d'expertise




Reference number
ISO 9612:2009(E)
©
ISO 2009

---------------------- Page: 7 ----------------------

SIST EN ISO 9612:2009
ISO 9612:2009(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


COPYRIGHT PROTECTED DOCUMENT


©  ISO 2009
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 either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2009 – All rights reserved

---------------------- Page: 8 ----------------------

SIST EN ISO 9612:2009
ISO 9612:2009(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Symbols . 4
5 Instrumentation. 5
6 Methodology — Chronological steps . 6
7 Work analysis. 7
8 Selection of measurement strategies. 8
9 Strategy 1 — Task-based measurement.9
10 Strategy 2 — Job-based measurement . 12
11 Strategy 3 — Full-day measurement. 14
12 Measurements. 15
13 Sources of uncertainty. 17
14 Calculation of measurement uncertainties and presentation of the final results. 19
15 Information to be reported. 19
Annex A (informative) Example of a checklist to ensure that significant noise events are detected
during the work analysis. 21
Annex B (informative) Guide to the selection of measurement strategy . 22
Annex C (normative) Evaluation of measurement uncertainties . 25
Annex D (informative) An example showing calculation of daily noise exposure level using task-
based measurements . 33
Annex E (informative) An example showing calculation of daily noise exposure level using
job-based measurements . 37
Annex F (informative) Sample calculation of daily noise exposure level using full-day
measurements. 40
Bibliography . 43

© ISO 2009 – All rights reserved iii

---------------------- Page: 9 ----------------------

SIST EN ISO 9612:2009
ISO 9612:2009(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 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 9612 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
This second edition cancels and replaces the first edition (ISO 9612:1997), which has been technically revised.
iv © ISO 2009 – All rights reserved

---------------------- Page: 10 ----------------------

SIST EN ISO 9612:2009
ISO 9612:2009(E)
Introduction
This International Standard provides a stepwise approach to the determination of occupational noise exposure
from noise level measurements. The procedure contains the following major steps: work analysis, selection of
measurement strategy, measurements, error handling and uncertainty evaluations, calculations, and
presentation of results. This International Standard specifies three different measurement strategies: task-
based measurement; job-based measurement; and full-day measurement. This International Standard gives
guidance on selecting an appropriate measurement strategy for a particular work situation and purpose of
investigation. This International Standard also provides an informative spreadsheet to allow calculation of
measurement results and uncertainties. ISO is not responsible for errors that may arise or occur with the use
of this spreadsheet.
This International Standard recognizes the use of hand-held sound level meters as well as personal sound
exposure meters. The methods specified optimize the effort required for obtaining a given accuracy.
© ISO 2009 – All rights reserved v

---------------------- Page: 11 ----------------------

SIST EN ISO 9612:2009

---------------------- Page: 12 ----------------------

SIST EN ISO 9612:2009
INTERNATIONAL STANDARD ISO 9612:2009(E)

Acoustics — Determination of occupational noise exposure —
Engineering method
1 Scope
This International Standard specifies an engineering method for measuring workers’ exposure to noise in a
working environment and calculating the noise exposure level. This International Standard deals with
A-weighted levels but is applicable also to C-weighted levels. Three different strategies for measurement are
specified. The method is useful where a determination of noise exposure to engineering grade is required, e.g.
for detailed noise exposure studies or epidemiological studies of hearing damage or other adverse effects.
The measuring process requires observation and analysis of the noise exposure conditions so that the quality
of the measurements can be controlled. This International Standard provides methods for estimating the
uncertainty of the results.
This International Standard is not intended for assessment of masking of oral communication or assessment
of infrasound, ultrasound and non-auditory effects of noise. It does not apply to the measurement of the noise
exposure of the ear when hearing protectors are worn.
Results of the measurements performed in accordance with this International Standard can provide useful
information when defining priorities for noise control measures.
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.
ISO 1999, Acoustics — Determination of occupational noise exposure and estimation of noise-induced
hearing impairment
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
measurement (GUM:1995)
IEC 60942:2003, Electroacoustics — Sound calibrators
IEC 61252, Electroacoustics — Specifications for personal sound exposure meters
IEC 61672-1:2002, Electroacoustics — Sound level meters — Part 1: Specifications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
© ISO 2009 – All rights reserved 1

---------------------- Page: 13 ----------------------

SIST EN ISO 9612:2009
ISO 9612:2009(E)
3.1
A-weighted time-averaged sound pressure level
L
p,A,T
A-weighted equivalent continuous sound pressure level
L
p,A,eqT
ten times the logarithm to the base 10 of the ratio of the time average of the square of the A-weighted sound
pressure, p , during a stated time interval of duration T (starting at t and ending at t ), to the square of a
A 1 2
reference value, p , expressed in decibels
0
t
⎡⎤2
1
2
⎢⎥
pt()dt
A

⎢⎥T
t
⎢⎥1
LL== 10 lg dB (1)
pT,A, p,A,eqT
2
⎢⎥
p
0
⎢⎥
⎢⎥
⎢⎥
⎣⎦
where the reference value, p , is 20 µPa
0
[9]
NOTE Adapted from ISO/TR 25417:2007 .
3.2
A-weighted noise exposure level normalized to an 8 h working day
daily noise exposure level
L
EX,8h
〈occupational noise〉 level, in decibels, given by the equation:
⎡⎤T
e
LL=+10 lg dB (2)
⎢⎥
EX,8h pT,A,eq
e
T
⎣⎦0
where
L is the A-weighted equivalent continuous sound pressure level for T ;
p,A,eqT e
e
T is the effective duration, in hours, of the working day;
e
T is the reference duration, T = 8 h
0 0
NOTE 1 If the effective duration of the working day, T , is equal to 8 h, then L equals L .
e EX,8h p,A,eq,8h
NOTE 2 If the average or normalized exposure over a number of days is desired, Equation (3) can be used:
X
⎡⎤
1 0,1× L
EX,8h,x
L = 10 lg 10 dB (3)
EX,8h⎢⎥

X
⎢⎥
⎣⎦x=1
The value of X is chosen according to the purpose of the averaging process. For example, X = 5 leads to a daily noise
exposure level normalized to a nominal week of five 8 h working days.
[9]
NOTE 3 This definition differs from that given in ISO/TR 25417:2007 .
3.3
nominal day
working day over which it is chosen to determine the noise exposure
2 © ISO 2009 – All rights reserved

---------------------- Page: 14 ----------------------

SIST EN ISO 9612:2009
ISO 9612:2009(E)
NOTE 1 The nominal day is determined from the work analysis and depends on the purpose of the measurements. For
example, it may be a typical day representing the work performed over several days or the day with the highest noise
exposure. See also 7.3.
NOTE 2 The noise exposure level is normally calculated on a daily basis, but there may be circumstances where the
use of weekly or longer periods of noise exposure is considered appropriate.
3.4
C-weighted peak sound pressure level
L
p,Cpeak
ten times the logarithm to the base 10 of the ratio of the square of the C-weighted peak sound pressure,
p , to the square of a reference value, p , expressed in decibels
Cpeak 0
2
p
Cpeak
L = 10 lg dB (4)
p,Cpeak
2
p
0
where the reference value, p , is 20 µPa.
0
3.5
task
〈occupational noise〉 distinct part of a worker's occupational activity
Figure 1 illustrates the hierarchy of jobs and tasks.
3.6
job
〈occupational noise〉 overall occupational activity that is carried out by a worker, consisting of all the tasks
performed by the worker during the entire working day or shift
NOTE A worker often has a job title that describes his or her job, sometimes complemented with an additional
description to ensure clear identification, e.g. “welder - process line A”.
Figure 1 illustrates the hierarchy of jobs and tasks.

Key
Job 1 scaffolders Task 1 planning
Job 2 welders Task 2 grinding
Job 3 painters Task 3 welding
Job 4 store keepers
Figure 1 — An example illustrating the hierarchy of jobs and tasks
© ISO 2009 – All rights reserved 3

---------------------- Page: 15 ----------------------

SIST EN ISO 9612:2009
ISO 9612:2009(E)
4 Symbols
c sensitivity coefficient related to each input quantity —
i
c sensitivity coefficient associated with job noise level sampling —
1
c sensitivity coefficient associated with noise level sampling of task m —
1a,m
−1
c sensitivity coefficient associated with estimation of duration of task m dB h
1b,m
c sensitivity coefficient associated with measurement instrumentation —
2
c sensitivity coefficient associated with microphone position —
3
i task sample number —
I the total number of task samples —
j number of observations of task duration —
J total number of observations of task duration —
k coverage factor related to a confidence interval —
K denominator as given in C.3.3, Note 2 —
N
L A-weighted noise exposure level normalized to a nominal 8 h working day dB
EX,8h
L A-weighted noise exposure level normalized to a nominal 8 h working day averaged
EX,8h
over a number of days dB
L A-weighted noise exposure level of task m contributing to the daily noise exposure level dB
EX,8h,m
*
L estimate of the true A-weighted equivalent continuous sound pressure level for task m dB
pT,,A,eqm
L = L A-weighted equivalent continuous sound pressure level over a period T dB
p,A,T p,A,eqT
L A-weighted equivalent continuous sound pressure level for task m dB
p,A,eqT,m
L arithmetic average of a number of samples of the A-weighted equivalent continuous
p,A,eqTm,
sound pressure levels for task m dB
L A-weighted equivalent continuous sound pressure level of job sample n dB
p,A,eqT,n
L A-weighted equivalent continuous sound pressure level for the effective duration
p,A,eqT
e
of the working day dB
L C-weighted peak sound pressure level dB
p,Cpeak
m task number —
M total number of tasks —
n job sample number —
N total number of job samples —
n number of workers in a homogenous exposure group —
G
−5
p reference value; p = 2 × 10 Pa Pa
0 0
p A-weighted sound pressure Pa
A
p C-weighted peak sound pressure Pa
Cpeak
Q correction for measurement instrumentation dB
2
Q correction for microphone position dB
3
t duration of measurement as described in Figure 2 h
T time period over which an average is taken h
T reference duration; T = 8 h h
0 0
4 © ISO 2009 – All rights reserved

---------------------- Page: 16 ----------------------

SIST EN ISO 9612:2009
ISO 9612:2009(E)
T effective duration of the working day h
e
T duration of task m h
m
T duration of sample j of task m h
m,j
T duration of job sample n h
n
U expanded uncertainty dB
u combined standard uncertainty dB
u standard uncertainty of each input quantity dB
i
u standard uncertainty of the energy average of a number of measurements of A-weighted
1
equivalent continuous sound pressure level dB

*
u estimated standard uncertainty of a number of measurements of A-weighted equivalent
1
continuous sound pressure level dB
u standard uncertainty due to noise level sampling of task m dB
1a,m
u standard uncertainty due to the estimation of duration of task m h
1b,m
u standard uncertainty due to the instrumentation dB
2
u standard uncertainty due to the instrumentation in the task method dB
2,m
u standard uncertainty due to microphone position dB
3
x day number —
X total number of days —
5 Instrumentation
5.1 Sound level meters and personal sound exposure meters
Measurements can be made by using either integrating-averaging sound level meters or personal sound
exposure meters.
Sound level meters, including the microphone and associated cables, shall meet the requirements for
IEC 61672-1:2002, class 1 or class 2 instrumentation. Class 1 instrumentation is preferred and should be
used when measuring at very low temperatures or when the noise is dominated by high frequencies (see also
Note 3).
Personal sound exposure meters, including the microphone and cable, shall meet the requirements specified
in IEC 61252. Personal sound exposure meters fulfilling the requirements of IEC 61672-1:2002, class 1, are
recommended and should be used when measuring at very low temperatures or when the noise is dominated
by high frequencies (see also Notes 2 and 4).
[10] 1) [11] 1)
NOTE 1 Most sound level meters that meet the requirements of IEC 60651:2001 and IEC 60804:2000 also
meet the acoustic requirements of IEC 61672-1:2002.
NOTE 2 “Personal sound exposure meter” is often referred to as “noise dose meter” or “noise dosimeter” (North
America).
NOTE 3 For IEC 61672-1:2002, class 1 instruments, the specified tolerance limits are applied for the temperature
range from −10 °C to +50 °C. For instrumentation in accordance with IEC 61672-1:2002, class 2, and for personal sound
exposure meters in accordance with IEC 61252, the influence of variations in the air temperature on the measured signal
level is specified over the range from 0 °C to +40 °C. In order to maintain accuracy when performing measurements
outside this temperature range, it can be necessary to use an instrument for which the manufacturer specifies compliance

1) Superseded.
© ISO 2009 – All rights reserved 5

---------------------- Page: 17 ----------------------

SIST EN ISO 9612:2009
ISO 9612:2009(E)
for a wider temperature range. Alternatively, a sound level meter in accordance with IEC 61672-1:2002, class 1, may be
selected. In cold conditions, the measuring instrument may be kept warm, e.g. under clothing, such that only the
microphone is exposed to low temperatures.
NOTE 4 The choice of the instrumentation influences the uncertainty of the measurements.
NOTE 5 For personal sound exposure meters, IEC 61252 allows wide tolerances in the frequency characteristics
above 4 000 Hz, which can lead to incorrect measurement of high frequency sound such as that from air nozzles. In order
to reduce the uncertainty when measuring noise dominated by high frequencies, it may be necessary to use a measuring
instrument for which the manufacturer specifies high frequency characteristics within a narrower tolerance range.
Alternatively, a sound level meter specified in accordance with IEC 61672-1:2002, class 1, may be selected.
Personal sound exposure meters can have a cut-off level at around 70 dB. It should be checked whether this
influences the measurement result.
5.2 Calibrator
The calibrator shall meet the requirements specified in IEC 60942:2003, class 1.
5.3 Periodic verification
The calibration of the sound calibrator and the compliance of the instrumentation system with the
requirements of IEC 61672-1, IEC 61252 and other relevant standards shall be verified at intervals in a
laboratory making calibrations traceable to appropriate standards.
Unless national regulations dictate otherwise, it is recommended that the sound calibrator and the compliance
of the instrumentation system with the requirements of IEC 61672-1 be verified at intervals not exceeding
2 years.
The date for the last periodic verification and the name of the laboratory that performed it shall be recorded
and given in the measurement report.
6 Methodology — Chronological steps
6.1 Step 1: Work analysis
The work analysis shall provide sufficient information about the work and the workers under consideration so
that an appropriate measurement strategy can be selected and measurements can be planned. Work analysis
shall be carried out in accordance with Clause 7.
6.2 Step 2: Selection of the measurement strategy
A measurement strategy shall be selected from task-based measurement, job-based measurement or full-day
measurement as specified in Clause 8. More than one measurement strategy may be used, if relevant (see
Clause B.6).
6.3 Step 3: Measurements
The basic measurement quantity shall be L . In addition, L shall be measured, if relevant. The
p,A,eqT p,Cpeak
measurements shall follow the chosen strategy as specified in one of Clauses 9, 10 or 11 and comply with the
requirements of Clause 12.
6.4 Step 4: Error handling and uncertainties
Sources of errors and uncertainties that may influence the result shall be evaluated in accordance with
Clauses 13 and 14.
6 © ISO 2009 – All rights reserved

---------------------- Page: 18 ----------------------

SIST EN ISO 9612:2009
ISO 9612:2009(E)
6.5 Step 5: Calculation and presentation of results and uncertainty
Calculate L as specified for the selected strategy (see Clauses 9, 10, and 11) and the uncertainty as
EX,8h
specified in Annex C. The results and uncertainties can be calculated by using the spreadsheet provided with
this International Standard.
The results shall be presented as specified in Clause 15. Annexes D, E, and F provide practical examples for
the task-based, job-based, and full-day measurements, respectively.
7 Work analysis
7.1 Introduction
Work analysis is required in all situations. It shall provide the information necessary to:
a) describe the activities of the enterprise and the jobs of the workers under consideration;
b) define homogeneous noise exposure groups (see 7.2), if relevant;
c) determine a nominal day or days for each worker or group;
d) identify tasks which make up the jobs, if relevant;
e) identify possible significant noise events;
f) choose the measurement strategy;
g) establish the measurement plan.
The work shall be analysed with emphasis put on production, process, organization, workers and activities.
The measurements may be performed by using the task-based, job-based or full-day strategy. Whichever
strategy is used, it is essential to identify all events which are significant with regard to noise exposure and to
make sure that the measurement plan takes them into account. See Annex A for an example of a checklist.
NOTE The order in which the items above are performed can depend on the complexity of the situation on site. The
items are strongly connected, and the process can therefore be iterative in complex situations, i.e. increased knowledge
about one of the items can result in a new description or redefinition of others.
7.2 Defining homogeneous noise exposure groups
Measurement efforts can be reduced by defining homogeneous noise exposure groups. These are groups of
workers that are performing the same job and are expected to have similar noise exposures during the
working day. If used, the homogeneous noise exposure group shall be clearly identified and can consist of
one or more workers.
NOTE A homogeneous noise exposure group is also called similar noise exposure group US.
Homogeneous noise exposure groups can be defined in a number of ways. For example, it may be possible to
define such groups according to job title, function, work area or profession. Alternatively, the groups can be
...

SLOVENSKI SIST EN ISO 9612

STANDARD
julij 2009













Akustika – Določanje izpostavljenosti hrupu v delovnem okolju – Inženirska

metoda (ISO 9612:2009)


Acoustics – Determination of occupational noise exposure – Engineering method

(ISO 9612:2009)


Acoustique – Détermination de I'exposition au bruit en milieu de travail – Méthode

d'expertise (ISO 9612:2009)



Akustik – Bestimmung der Larmexposition am Arbeitsplatz – Verfahren der

Genauigkeitsklasse 2 (Ingenieurverfahren) (ISO 9612:2009)




















Referenčna oznaka
ICS 13.140 SIST EN ISO 9612:2009 (sl)



Nadaljevanje na straneh II, III in od 2 do 45



© 2013-07. Slovenski prevod standarda je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN ISO 9612 : 2009
NACIONALNI UVOD

Standard SIST EN ISO 9612 (sl), Akustika – Določanje izpostavljenosti hrupu v delovnem okolju –
Inženirska metoda (ISO 9612:2009), 2009, ima status slovenskega standarda in je istoveten
evropskemu standardu EN ISO 9612 (en), Acoustics – Determination of occupational noise exposure
– Engineering method (ISO 9612:2009), 2009.

NACIONALNI PREDGOVOR

Evropski standard EN ISO 9612:2009 je pripravil tehnični odbor ISO/TC 43 Akustika v sodelovanju s
tehničnim odborom Evropskega komiteja za standardizacijo CEN/TC 211 Akustika. Slovenski standard
SIST EN ISO 9612:2009 je prevod evropskega standarda EN ISO 9612:2009. V primeru spora glede
besedila slovenskega prevoda v tem standardu je odločilen izvirni evropski standard. Slovenski
prevod SIST EN ISO 9612:2009 je pripravil tehnični odbor SIST/TC AKU Akustika.

Odločitev za izdajo tega standarda je dne 21. maja 2009 sprejel SIST/TC AKU Akustika.

ZVEZA S STANDARDI

S privzemom tega evropskega standarda veljajo za omenjeni namen referenčnih standardov vsi
standardi, navedeni v izvirniku, razen tistih, ki so že sprejeti v nacionalno standardizacijo:

SIST ISO 1999:2006 Akustika – Ugotavljanje izpostavljenosti hrupu pri delu in ocena
okvare sluha zaradi hrupa

Vodilo ISO/IEC 98-3 Merilna negotovost – 3. del: Vodilo za izražanje merilne negotovosti
(GUM: 1995)

SIST EN 60942:2004  Elektroakustika – Kalibratorji za zvokomere

SIST EN 61252 Elektroakustika – Specifikacije osebnih merilnikov izpostavljenosti
zvoku

SIST EN 61672-1:2004 Elektroakustika – Merilniki ravni zvoka – 1. del: Specifikacije

OSNOVA ZA IZDAJO STANDARDA

– privzem standarda EN ISO 9612:2009

PREDHODNA IZDAJA

SIST ISO 9612:1998 Akustika – Smernice za merjenje in oceno izpostavljenosti hrupu v delovnem
okolju

OPOMBE

– Povsod, kjer se v besedilu standarda uporablja izraz “evropski standard” oziroma “mednarodni
standard”, v SIST EN ISO 9612:2009 to pomeni “slovenski standard”.

– Uvod in nacionalni predgovor nista sestavni del standarda.

II

---------------------- Page: 2 ----------------------

SIST EN ISO 9612 : 2009
– Ta nacionalni dokument je istoveten EN ISO 9612:2009 in je objavljen z dovoljenjem
CEN

Rue de Stassart, 36
1050 Bruselj
Belgija

This national document is identical with EN ISO 9612:2009 and is published with the permission of
CEN

Rue de Stassart, 36
1050 Bruxelles
Belgium
III

---------------------- Page: 3 ----------------------

EVROPSKI STANDARD EN ISO 9612
EUROPEAN STANDARD
EUROPÄISCHE NORM
NORME EUROPÉENNE april 2009


ICS: 13.140




Slovenska izdaja

Akustika – Določanje izpostavljenosti hrupu v delovnem okolju – Inženirska
metoda (ISO 9612:2009)

Acoustics – Determination of Acoustique – Détermination de Akustik – Bestimmung der
occupational noise exposure – I'exposition au bruit en milieu de Larmexposition am Arbeitsplatz –
Engineering method travail – Méthode d'expertise Verfahren der Genauigkeitsklasse 2
(ISO 9612:2009) (ISO 9612:2009) (Ingenieurverfahren) (ISO 9612:2009)




Ta evropski standard je CEN sprejel 5. marca 2009.

Člani CEN morajo izpolnjevati notranje predpise CEN/CENELEC, s katerimi je predpisano, da mora
biti ta standard brez kakršnih koli sprememb sprejet kot nacionalni standard. Seznami najnovejših
izdaj teh nacionalnih standardov in njihovi bibliografski podatki so na voljo pri Upravnem centru CEN
ali pri katerem koli članu CEN.

Ta evropski standard obstaja v treh uradnih izdajah (angleški, francoski, nemški). Izdaje v drugih
jezikih, ki jih člani CEN na lastno odgovornost prevedejo in izdajo ter prijavijo pri Upravnem centru
CEN, veljajo kot uradne izdaje.

Člani CEN so nacionalni organi za standarde Avstrije, Belgije, Bolgarije, Cipra, Češke republike,
Danske, Estonije, Finske, Francije, Grčije, Irske, Islandije, Italije, Latvije, Litve, Luksemburga,
Madžarske, Malte, Nemčije, Nizozemske, Norveške, Poljske, Portugalske, Romunije, Slovaške,
Slovenije, Španije, Švedske, Švice in Združenega kraljestva.









CEN
Evropski komite za standardizacijo
European Committee for Standardization
Europäisches Komitee für Normung
Comité Européen de Normalisation

Upravni center: Avenue Marnix 17, B-1000 Bruselj


© 2009 CEN  Lastnice avtorskih pravic so vse države članice CEN Ref. oznaka: EN ISO 9612:2009 E

---------------------- Page: 4 ----------------------

SIST EN ISO 9612 : 2009
VSEBINA Stran
Predgovor .3
Uvod .4
1 Področje uporabe .5
2 Zveza s standardi .5
3 Izrazi in definicije .5
4 Simboli.7
5 Merilne naprave .9
6 Metode – Zaporedni koraki.10
7 Analiza dela .10
8 Izbira merilnih strategij.12
9 Strategija 1 – Meritev za opravila.12
10 Strategija 2 – Meritev za delovno mesto .16
11 Strategija 3 – Celodnevna meritev .17
12 Meritve.18
13 Vzroki negotovosti .20
14 Računanje merilnih negotovosti in predstavitev končnih rezultatov.21
15 Podatki, o katerih je treba poročati.21
Dodatek A (informativni): Primer kontrolnika, ki zagotavlja, da so v analizi dela zaznani
vsi pomembni hrupni dogodki.24
Dodatek B (informativni): Vodilo za izbiro strategije meritev .25
Dodatek C (normativni): Vrednotenje merilnih negotovosti .28
Dodatek D (informativni): Primer izračuna dnevne ravni izpostavljenosti hrupu pri meritvah
za opravila .35
Dodatek E (informativni): Primer izračuna dnevne ravni izpostavljenosti hrupu
za delovno mesto .39
Dodatek F (informativni): Primer izračuna dnevne ravni izpostavljenosti hrupu za
celodnevne meritve .42
Literatura.45

2

---------------------- Page: 5 ----------------------

SIST EN ISO 9612 : 2009
Predgovor

ISO (Mednarodna organizacija za standardizacijo) je svetovna zveza nacionalnih organov za standarde
(članov ISO). Mednarodne standarde ponavadi pripravljajo tehnični odbori ISO. Vsak član, ki želi
delovati na določenem področju, za katero je bil ustanovljen tehnični odbor, ima pravico biti zastopan v
tem odboru. Pri delu sodelujejo tudi mednarodne vladne in nevladne organizacije, povezane z ISO. V
vseh zadevah, ki so povezane s standardizacijo na področju elektrotehnike, ISO tesno sodeluje z
Mednarodno elektrotehniško komisijo (IEC).

Mednarodni standardi so pripravljeni v skladu s pravili, podanimi v 2. delu Direktiv ISO/IEC.

Glavna naloga tehničnih odborov je priprava mednarodnih standardov. Osnutki mednarodnih
standardov, ki jih sprejmejo tehnični odbori, se pošljejo vsem članom v glasovanje. Za objavo
mednarodnega standarda je treba pridobiti soglasje najmanj 75 odstotkov članov, ki se udeležijo
glasovanja.

Opozoriti je treba na možnost, da je lahko nekaj elementov tega dokumenta predmet patentnih pravic.
ISO ne prevzema odgovornosti za identifikacijo katerihkoli ali vseh takih patentnih pravic.

ISO 9612 je pripravil tehnični odbor ISO/TC 43, Akustika, pododbor SC 1, Hrup.

Ta druga izdaja razveljavlja in nadomešča prvo izdajo (ISO 9612:1997), ki je bila tehnično
spremenjena.

3

---------------------- Page: 6 ----------------------

SIST EN ISO 9612 : 2009
Uvod

Ta mednarodni standard omogoča postopek po korakih za določanje izpostavljenosti hrupu v
delovnem okolju z meritvami ravni hrupa. Postopek vsebuje naslednje bistvene korake: analizo dela,
izbor strategije meritev, meritve, obravnavanje napak in oceno negotovosti, izračune in predstavitev
rezultatov. Ta mednarodni standard navaja tri različne merilne strategije: meritve za opravila, meritve
za delovno mesto in celodnevne meritve. Ta mednarodni standard daje napotke za izbiro primerne
merilne strategije pri določenih razmerah in namenu preiskave. Ta mednarodni standard nudi
informativno tudi tabelarični računski program, ki dopušča izračun rezultatov meritev in negotovosti.
ISO ni odgovoren za napake, ki se lahko pojavijo ali zgodijo z uporabo tega programa.

Ta mednarodni standard priznava uporabo ročnih merilnikov ravni zvoka in tudi osebnih merilnikov
izpostavljenosti zvoku. Podane metode so optimalne glede zahtevnosti, ki je potrebna za pridobitev
določene točnosti.

4

---------------------- Page: 7 ----------------------

SIST EN ISO 9612 : 2009
Akustika – Določanje izpostavljenosti hrupu v delovnem okolju – Inženirska
metoda

1 Področje uporabe

Ta mednarodni standard določa inženirsko metodo za merjenje izpostavljenosti delavcev hrupu v
delovnem okolju ter za izračun ravni izpostavljenosti hrupu. Ta mednarodni standard obravnava
A-vrednotene ravni, vendar se uporablja tudi za C-vrednotene ravni. Navaja tri različne strategije
merjenja. Metoda se uporablja, kadar je potrebno ugotavljanje izpostavljenosti hrupu na inženirski
stopnji, npr. za podrobne študije izpostavljenosti hrupu ali za epidemiološke študije o poškodbi sluha
ali drugih škodljivih posledic.

Obravnavani merilni postopek zahteva opazovanje in analize razmer pri izpostavljenosti hrupu, tako
da je mogoče nadzorovati kakovost meritev. Ta mednarodni standard določa metode za ocenjevanje
negotovosti rezultatov.

Ta mednarodni standard ni namenjen oceni motenj pri govorni komunikaciji ali za ocenjevanje
infrazvoka, ultrazvoka ali učinkov hrupa, ki ne vplivajo na sluh. Ne uporablja se za merjenje
izpostavljenosti ušesa hrupu pri uporabi osebne varovalne opreme za varovanje sluha.

Rezultati meritev, opravljenih v skladu s tem mednarodnim standardom, lahko dajo uporabne podatke
za določanje prednostnega reda pri ukrepih za obvladovanje hrupa.

2 Zveza s standardi

Naslednji navedeni dokumenti so neizogibno potrebni za uporabo tega dokumenta. Za datirano
sklicevanje se uporablja samo navedena izdaja. Za nedatirano sklicevanje se uporablja zadnja izdaja
navedenega dokumenta (vključno z vsemi dopolnili).

ISO 1999 Akustika – Ugotavljanje izpostavljenosti hrupu pri delu in ocena okvare sluha
zaradi hrupa

Vodilo ISO/IEC 98-3 Merilna negotovost – 3. del: Vodilo za izražanje merilne negotovosti
(GUM: 1995)

IEC 60942:2003 Elektroakustika – Kalibratorji za zvokomere

IEC 61252 Elektroakustika – Specifikacije osebnih merilnikov izpostavljenosti zvoku

IEC 61672-1:2002 Elektroakustika – Merilniki ravni zvoka – 1. del: Specifikacije

3 Izrazi in definicije

Za namene tega dokumenta se uporabljajo naslednji izrazi in definicije.

3.1
A-vrednotena časovno povprečena raven zvočnega tlaka
L
p,A,T
A-vrednotena ekvivalentna neprekinjena raven zvočnega tlaka
L
p,A,eqT
desetkratnik dekadnega logaritma razmerja časovno povprečenega kvadrata A-vrednotenega tlaka
zvoka, p , med navedenim časovnim intervalom T (začetek pri t in konec pri t ) in kvadrata
A 1 2
referenčnega tlaka p , izražen v decibelih (dB)
0
5

---------------------- Page: 8 ----------------------

SIST EN ISO 9612 : 2009
t
⎡ 2 ⎤
1
2
⎢ ⎥
p (t)dt
A

⎢ ⎥
T
t
⎢ 1 ⎥
L = L = 10 lg dB (1)
p,A,T p,A,eqT
2
⎢ ⎥
p
0
⎢ ⎥
⎢ ⎥
⎢ ⎥
⎣ ⎦

kjer je referenčna vrednost, p , 20 µPa
0

[9]
OPOMBA: Prilagojeno po ISO/TR 25417:2007 .

3.2
A-vrednotena raven izpostavljenosti hrupu, normalizirana na 8-urni delovnik
dnevna raven izpostavljenosti hrupu
L
EX, 8h
(poklicni hrup) raven, v decibelih, podana z enačbo:

⎡ ⎤
T
e
L = L +10 lg dB (2)
EX,8h p,A,eqT ⎢ ⎥
e
T
⎣ 0⎦
kjer so:

L A-vrednotena ekvivalentna neprekinjena raven zvočnega tlaka za T
p,A,eqTe e
T efektivno trajanje delovnika, v urah
e
T referenčni čas, T = 8 h
0 0

OPOMBA 1: Če je efektivno trajanje delovnika, T , enako 8 h, potem je L , enaka L , .
e EX 8h p A,eq,8h

OPOMBA 2: Če želimo povprečno ali normalizirano izpostavljenost preko več dni, lahko uporabimo enačbo (3).

X
⎡ ⎤
1
0,1× L
EX,8h,x
(3)
LEX,8h= 10 lg⎢ 10 ⎥ dB

X
⎢ ⎥
⎣ x=1 ⎦
Vrednost X se izbere glede na namen postopka povprečenja. Na primer, X = 5 dá dnevno raven
izpostavljenosti hrupu v nazivnemu tednu po pet 8-urnih delovnikov.

[9]
OPOMBA 3: Ta definicija se razlikuje od navedene v ISO/TR 25417:2007 .

3.3
nazivni dan
delovnik, ki je izbran za določitev izpostavljenosti hrupu

OPOMBA 1: Nazivni dan se določi z analizo dela in je odvisen od namena meritev. Lahko je npr. značilni dan, ki predstavlja
delo preko več dni, ali dan z največjo izpostavljenostjo hrupu. Glej tudi 7.3.
OPOMBA 2: Raven izpostavljenosti hrupu se običajno računa za en dan, vendar jo je mogoče v danih okoliščinah primerno
obravnavati preko tedna ali daljšega obdobja izpostavljenosti hrupu.

3.4
C-vrednotena vršna raven zvočnega tlaka
L
p,Cpeak
desetkratnik dekadnega logaritma razmerja kvadrata C-vrednotenega vršnega zvočnega tlaka, p ,
Cpeak
in kvadrata referenčne vrednosti, p , izražen v decibelih
0

6

---------------------- Page: 9 ----------------------

SIST EN ISO 9612 : 2009
2
p
Cpeak
L = 10 lg dB
(4)
p,Cpeak
2
p
0
Referenčna vrednost, p , je 20 µPa.
0
3.5
opravilo
(poklicni hrup) določen del poklicnega dela zaposlenega

Slika 1 ponazarja hierarhijo poklicne dejavnosti in opravil.

3.6
delovno mesto
(poklicni hrup), celotna poklicna dejavnost, ki jo opravlja delavec, sestavljena iz vseh opravil, ki jih
delavec opravlja med celotnim delovnikom ali izmeno

OPOMBA: Delavcu je pogosto dodeljen naziv delovnega mesta, ki opisuje njegovo/njeno delo, včasih dopolnjeno z
dodatnim opisom, da je jasneje opredeljeno, na primer "varilec-proizvodni trak A".

Slika 1 ponazarja hierarhijo poklicne dejavnosti in opravil.


Podjetje




Delovno mesto 1 Delovno mesto 2 Delovno mesto 3 Delovno mesto 4 Delovna mesta




Opravilo 1 Opravilo 2 Opravila
Opravilo 3


Legenda

Delovno mesto 1 postavljalci odra Opravilo 1 načrtovanje
Delovno mesto 2 varilci Opravilo 2 brušenje
Delovno mesto 3 pleskarji Opravilo 3 varjenje
Delovno mesto 4 skladiščniki

Slika 1: Primer hierarhije delovnega mesta in opravil

4 Simboli
c koeficient občutljivosti za dano vhodno količino –
i
c koeficient občutljivosti za vzorčenje ravni hrupa za delovno mesto –
1
c koeficient občutljivosti za vzorčenje ravni hrupa za opravilo m –
1a,m
–1
c koeficient občutljivosti za oceno trajanja opravila dB h
1b,m
c koeficient občutljivosti za merilni instrument –
2
c koeficient občutljivosti za mesto mikrofona –
3
i številka vzorca opravila (meritve ravni hrupa) –
I celotno število vzorcev za opravilo (meritev ravni hrupa) –
7

---------------------- Page: 10 ----------------------

SIST EN ISO 9612 : 2009
j številka opazovanja trajanja opravila –
J celotno število opazovanj trajanja opravila –
k faktor pokritosti intervala zaupanja –
K imenovalec, kot je podan v C.3.3, opomba 2 –
N
L A-vrednotena raven izpostavljenosti hrupu, normalizirana na 8-urni delovnik dB
EX,8h
A-vrednotena raven izpostavljenosti hrupu, povprečena preko več dni in
L

EX,8h
normalizirana na 8-urni delovnik dB
L A-vrednotena raven izpostavljenosti hrupu za opravilo m, ki prispeva k
EX,8h,m
dnevni ravni izpostavljenosti hrupu dB
L* , ocena prave vrednosti A-vrednotene neprekinjene ekvivalentne ravni

p A,eqT,m
zvočnega tlaka pri opravilu m dB
L = L A-vrednotena ekvivalentna neprekinjena raven zvočnega tlaka v časovnem
p,A,T p,A,eqT
intervalu T dB
L A-vrednotena ekvivalentna neprekinjena raven zvočnega tlaka za opravilo m dB
p,A,eqT,m
L aritmetično povprečje vzorcev A-vrednotenih ekvivalentnih neprekinjenih ravni
p,A,eqT,m
zvočnih tlakov za opravilo m dB
L vzorec A-vrednotene ekvivalentne neprekinjene ravni zvočnega tlaka
p,A.eqT,n
za delovno mesto n dB
L A-vrednotena ekvivalentna neprekinjena raven zvočnega tlaka za
p,A,eqT
e
efektivno trajanje delovnika dB
L C-vrednotena vršna raven zvočnega tlaka dB
p.Cpeak
m številka opravila –
M celotno število opravil –
n številka vzorca za delovno mesto –
N celotno število vzorcev za delovno mesto –
n število zaposlenih v skupini enake izpostavljenosti (homogeni skupini) –
G
–5
p referenčna vrednost; p = 2 x 10 Pa Pa
0 0
p A-vrednoten tlak zvoka Pa
A
p C-vrednoten tlak zvoka Pa
Cpeak
Q popravek za merilni instrument dB
2
Q popravek za mesto mikrofona dB
3
t trajanje meritve, kot je ponazorjeno na sliki 2 h
T časovni interval povprečenja h
T referenčni čas trajanja; T = 8 h h
0 0
T efektivno trajanje delovnika h
e
T trajanje opravila m h
m
T trajanje vzorca j pri opravilu m h
m,j
8

---------------------- Page: 11 ----------------------

SIST EN ISO 9612 : 2009
T trajanje vzorca za delovno mesto n h
n
U razširjena negotovost dB
u kombinirana standardna negotovost dB
u negotovost posameznih vhodnih vrednosti dB
i
u standardna negotovost energijske srednje vrednosti več meritev
1
A-vrednotenih ekvivalentnih neprekinjenih ravni zvoka dB
*
u ocena standardne negotovosti več meritev A-vrednotenih
1
ekvivalentnih neprekinjenih ravni zvočnega tlaka dB
u standardna negotovost vzorčenja ravni hrupa pri opravilu m dB
1a,m
u standardna negotovost ocene trajanja pri opravilu m h
1b,m
u standardna negotovost zaradi merilnih instrumentov dB
2
u standardna negotovost zaradi merilnih instrumentov pri metodi za opravilo dB
2,m
u standardna negotovost zaradi mesta mikrofona dB
3
x številka dneva –
X celotno število dni –
5  Merilne naprave

5.1 Merilne naprave za zvočne ravni in osebni merilniki izpostavljenosti zvoku

Meri se lahko z merilniki z integracijskim povprečenjem ravni zvoka ali z osebnimi merilniki izpostavljenosti
zvoku.

Merilniki ravni zvoka, vključno z mikrofonom in povezovalnimi kabli, morajo izpolnjevati zahteve za
instrumente IEC 61672-1:2002, razred 1 ali razred 2. Prednost ima instrument razreda 1 in ta naj se
uporabi, če so temperature zelo nizke ali če prevladuje hrup visokih frekvenc (glej tudi opombo 3).

Osebni merilniki izpostavljenosti zvoku, vključno z mikrofonom in kablom, morajo izpolnjevati zahteve
IEC 61252. Priporočajo se osebni merilniki izpostavljenosti zvoku, ki izpolnjujejo zahteve
IEC 61672-1:2002, razred 1, in naj se uporabijo, če so temperature zelo nizke ali če prevladuje hrup
visokih frekvenc (glej tudi opombi 2 in 4).

[10] 1) [11] 1)

OPOMBA 1: Večina merilnikov zvočnih ravni, ki izpolnjujejo zahteve IEC 60651:2001  in IEC 60804:2000 izpolnjuje
tudi akustične zahteve IEC 61672-1:2002.

OPOMBA 2: »Osebni merilnik izpostavljenosti zvoku« se pogosto imenuje tudi »merilnik doze (odmerka) hrupa« ali
»dozimeter hrupa« (Severna Amerika).

OPOMBA 3: Za instrumente po IEC 61672-1:2002, razred 1, se uporabljajo tolerančne meje za temperaturno območje od
–10 °C do +50 °C. Za instrumente v skladu z IEC 61672-1:2002, razred 2, in za osebne merilnike izpostavljenosti
zvoku v skladu z IEC 61252 je vpliv različnih temperatur zraka na izmerjeno raven signala naveden v območju od
0 °C do +40 °C. Za zagotovitev točnosti pri meritvah izven tega temperaturnega območja je mogoče uporabiti
instrument, za katerega proizvajalec navaja skladnost za širše temperaturno območje, sicer je treba izbrati
merilnik ravni hrupa, skladen z IEC 61672-1:2002, razred 1. V hladnih razmerah naj bo merilni instrument ogret,
na primer pod obleko, tako da je samo mikrofon izpostavljen nizkim temperaturam.

OPOMBA 4: Izbira instrumentov vpliva na negotovost meritev.

OPOMBA 5: Za osebne merilnike izpostavljenosti zvoku IEC 61252 dopušča večje tolerance za frekvenčno območje nad
4000 Hz, kar lahko povzroči napake pri meritvah zvoka visokih frekvenc, kot je zvok iztekajočega zraka iz šob.
Za zmanjšanje negotovosti pri merjenju hrupa, kjer prevladujejo visoke frekvence, je morda treba uporabiti

1)
Nadomeščen.
9

---------------------- Page: 12 ----------------------

SIST EN ISO 9612 : 2009
merilni instrument, za katerega proizvajalec navaja karakteristike za visoke frekvence znotraj ožjega
tolerančnega območja, sicer se lahko izbere merilnik ravni hrupa v skladu z IEC 61672-1:2002, razred 1.

Osebni merilniki izpostavljenosti zvoku imajo lahko prag zaznave okrog 70 dB. Preveri naj se, ali to
vpliva na rezultat meritve.

5.2 Kalibrator

Kalibrator mora izpolnjevati zahteve, določene v IEC 60942:2003, razred 1.
5.3 Periodično preverjanje

Skladnost kalibratorja zvoka in celotnega merilnega sistema z zahtevami IEC 61672-1, IEC 61252 in
drugimi ustreznimi standardi je treba preverjati v določenih časovnih intervalih v kvalificiranem
laboratoriju tako, da so kalibracije sledljive do ustreznih standardov.

Če nacionalni predpisi ne zahtevajo drugače, je priporočljivo, da se kalibrator zvoka in skladnost
merilnega sistema preverjata po zahtevah IEC 61672-1 v presledkih, ki niso daljši od 2 let.

Datum zadnjega periodičnega preverjanja in ime laboratorija, ki ga je opravil, morata biti zabeležena in
podana v zapisniku o meritvah.

6 Metode – Zaporedni koraki

6.1 1. korak: Analiza dela

Analiza dela mora dati dovolj podatkov o delu in o obravnavanih delavcih, tako da je mogoče izbrati
ustrezno strategijo merjenja in načrtovati meritve. Analiza dela se opravi v skladu s točko 7.

6.2 2. korak: Izbira strategije meritev

Strategijo meritev je treba izbrati med strategijo za opravilo ali za delovno mesto ali kot celodnevno meritev,
kot je določeno v točki 8. Če je prikladno, se lahko uporabi več kot ena strategija (glej točko B.6).

6.3 3. korak: Meritve

Osnovna merska količina mora biti L . Dodatno je treba meriti še L , kadar je to potrebno.
p,A,eqT p,Cpeak
Meritev mora biti skladna z izbrano strategijo, kot je določeno v eni od točk 9, 10 ali 11, ter mora
ustrezati zahtevam v točki 12.

6.4 4. korak: Obravnava napak pri meritvi in negotovosti

Vire napak in negotovosti, ki lahko vplivajo na rezultat, je treba ocenjevati v skladu s točkama 13 in 14.

6.5 5. korak: Izračun in predstavitev rezultatov in negotovosti

Izračuna se L , kot je določeno za izbrano strategijo (glej točke 9, 10 in 11), in negotovost, kot je
EX,8h
določeno v dodatku C. Rezultati in negotovosti se lahko izračunajo z uporabo preglednice v tem
mednarodnem standardu.

Rezultati morajo biti predstavljeni, kot to določa točka 15. V dodatkih D, E in F so praktični primeri za
opravilo, za delovno mesto oz. za celodnevne meritve.

7 Analiza dela

7.1 Uvod

Analiza dela je potrebna v vsakem primeru. Zagotavljati mora podatke, potrebne za:
10

---------------------- Page: 13 ----------------------

SIST EN ISO 9612 : 2009
a) opis dejavnosti podjetja in delovnih mest obravnavanih delavcev;
b) opredelitev skupine delavcev z enako izpostavljenostjo hrupu (glej 7.2), če je to potrebno;
c) ugotovitev nazivnega delovnika za vsakega zaposlenega oz. skupino;
d) določitev posameznih opravil, ki jih obsega delovno mesto, če je to potrebno;
e) identifikacijo morebitnih pomembnih hrupnih dogodkov;
f) izbiro strategije meritev;
g) načrt merjenja.
Delo je treba analizirati s poudarkom na proizvodnji, postopku, organizaciji, delavcih in dejavnostih.

Meritve se lahko opravijo z uporabo strategij za opravilo, za delovno mesto ali kot celodnevne meritve.
Ne glede na strategijo je bistveno zaznati vse dogodke, ki so pomembni za izpostavljenost hrupu, in
zagotoviti, da so ti upoštevani v načrtu merjenja. Primer kontrolnika glej v dodatku A.

OPOMBA: Vrstni red upoštevanja zgornje postavke je lahko odvisen od kompleksnosti razmer na terenu. Postavke so zelo
povezane in je zato lahko postopek v kompleksnih razmerah iterativen, tj. več podatkov o enem predmetu lahko
povzroči nov opis ali novo definiranje drugih.

7.2 Definiranje skupin enake izpostavljenosti hrupu

Zahtevnost meritev se da zmanjšati z opredelitvijo skupin z enako izpostavljenostjo hrupu (homogenih
skupin). To so skupine delavcev, ki opravljajo enako delo in so po pričakovanju podobno izpostavljene
hrupu med trajanjem delovnika. Če se uporablja, je treba skupino enake izpostavljenosti hrupu, ki jo
lahko sestavljajo en ali več delavcev, jasno opredeliti.

OPOMBA: Skupine enake izpostavljenosti hrupu (homogene skupine) imenujejo v ZDA tudi skupine podobne izpostavljenosti
hrupu.

Skupine enake izpostavljenosti hrupu je mogoče definirati na več načinov. Mogoče je npr. opredeliti
takšno skupino glede na naziv delovnega mesta, funkcijo, področje dela ali poklic. Druga možnost je
določiti skupine s pomočjo analize dela glede na kriterije proizvodnje, postopke ali dejavnosti pri delu.

Na kateri koli način so skupine definirane, naj se to preveri z delavci in preddelavci s posvetom in na
koncu z oceno rezultatov meritev; glej 10.4.

7.3 Določitev nazivnega dne

Nazivni dan, vključno z delom in odmori, se določi po posvetu z delavci in vodstvom. Delo je treba
proučiti, da se dobi pregled in razumevanje vseh dejavnikov, ki lahko vplivajo na izpostavljenost
hrupu. Več podrobnosti glej v dodatku A.

Vprašanja, ki jih je treba obravnavati, so:
a) opravila (vsebina in trajanje) in spremembe znotraj njih;
b) glavni viri hrupa in hrupna območja dela;
c) vzorec dela in vsi pomembni hrupni dogodki, ki vplivajo na spreminjanje ravni hrupa;
d) število in trajanje odmorov, sestankov itd. in ali jih je treba šteti kot del nazivnega delovnika.

Meritve je treba načrtovati tako, da se zagotovi, da so vključeni vsi pomembni hrupni dogodki.
Zabeležiti je treba vsakega od dogodkov, ko je do njega prišlo, njegovo naravo, trajanje in pogostost v
času delovnika. Primer kontrolnika, kako se zagotovi, da se pomembni hrupni dogodki odkrijejo med
analizo dela, je v dodatku A.

V nekaterih primerih se delo in posledično izpostavljenost hrupu spreminjata iz dneva v dan, tako da ni
tipične dnevne izpostavljenosti, npr. pri delavcih, ki delajo vsak dan na drugih mestih ali delih. V teh
11

---------------------- Page: 14 ----------------------

SIST EN ISO 9612 : 2009
primerih se lahko nazivni dan opredeli z razmerami pri delu, ki poteka več dni, npr. v enem tednu. Glej
tudi opombe v 3.2 in 3.3.

Vsi kazalniki, ki opredeljujejo delo z vidika hrupa, morajo biti prepoznani, ovrednoteni in zabeleženi.
Primeri takih kazalnikov so: tip proizvodnje v procesu, gradiva, količine, debelina obdelovanca,
nastavitev, hitrost in število v to delo vključenih delavcev.

Če je namen meritev ocena dolgotrajnega tveganja za okvare sluha delavcev, mora biti izbrani nazivni
dan reprezen
...

SLOVENSKI STANDARD
oSIST prEN ISO 9612:2007
01-julij-2007
$NXVWLND'RORþDQMHL]SRVWDYOMHQRVWLKUXSXYGHORYQHPRNROMX,QåHQLUVNDPHWRGD
,62',6
Acoustics - Determination of occupational noise exposure - Engineering method
(ISO/DIS 9612:2007)
Acoustique - Détermination de l'exposition au bruit en milieu de travail - Méthode
d'expertise (ISO/DIS 9612:2007)
Ta slovenski standard je istoveten z: prEN ISO 9612
ICS:
13.140 Vpliv hrupa na ljudi Noise with respect to human
beings
oSIST prEN ISO 9612:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
DRAFT
prEN ISO 9612
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2007
ICS 13.140

English Version
Acoustics - Determination of occupational noise exposure -
Engineering method (ISO/DIS 9612:2007)
Acoustique - Détermination de l'exposition au bruit en
milieu de travail - Méthode d'expertise (ISO/DIS 9612:2007)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 211.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 9612:2007: E
worldwide for CEN national Members.

---------------------- Page: 2 ----------------------
prEN ISO 9612:2007 (E)




Foreword

This document (prEN ISO 9612:2007) has been prepared by Technical Committee ISO/TC 43
"Acoustics" in collaboration with Technical Committee CEN/TC 211 "Acoustics", the
secretariat of which is held by DS.

This document is currently submitted to the parallel Enquiry.


Endorsement notice

The text of ISO/DIS 9612:2007 has been approved by CEN as prEN ISO 9612:2007 without
any modifications.

2

---------------------- Page: 3 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 9612
ISO/TC 43/SC 1 Secretariat: DS
Voting begins on: Voting terminates on:
2007-03-29 2007-08-29
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Acoustics — Determination of occupational noise exposure —
Engineering method
Acoustique — Détermination de l'exposition au bruit en milieu de travail — Méthode d'expertise
[Revision of first edition (ISO 9612:1997)]
ICS 13.140

ISO/CEN PARALLEL ENQUIRY
The CEN Secretary-General has advised the ISO Secretary-General that this ISO/DIS covers a subject
of interest to European standardization. In accordance with the ISO-lead mode of collaboration as
defined in the Vienna Agreement, consultation on this ISO/DIS has the same effect for CEN
members as would a CEN enquiry on a draft European Standard. Should this draft be accepted, a
final draft, established on the basis of comments received, will be submitted to a parallel two-month FDIS
vote in ISO and formal vote in CEN.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
© International Organization for Standardization, 2007

---------------------- Page: 4 ----------------------
ISO/DIS 9612
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall
not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the
unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user's country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, photocopying,
recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO's
member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
©
ii ISO 2007 – All rights reserved

---------------------- Page: 5 ----------------------
ISO/DIS 9612
Contents Page
Foreword .vi
Introduction.vii
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Instrumentation .3
4.1 Sound level meters and personal sound exposure meters .3
4.2 Calibrator.4
4.3 Periodic verification .4
5 Methodology – Chronological steps .4
5.1 Step 1: Work analysis .4
5.2 Step 2: Selection of the measurement strategy .5
5.3 Step 3: Measurements .5
5.4 Step 4: Error handling and uncertainties.5
5.5 Step 5: Calculation and presentation of results and uncertainty.5
6 Work analysis .5
6.1 Introduction.5
6.2 Identifying homogeneous noise exposure groups.6
6.3 Description of a nominal day .6
7 Selection of basic measurement strategies .6
7.1 General .6
7.2 Basic strategies.7
8 Strategy 1 – Task-based measurement.7
8.1 Splitting the nominal day.7
8.2 Measurement of L for work tasks .8
pAeq,T
8.3 Calculation of contribution from each task to daily noise exposure level.10
8.4 Determination of daily noise exposure level .10
9 Strategy 2 – Job-based measurement.11
9.1 Introduction.11
9.2 Measurement plan – Number, duration and distribution of measurements .11
9.3 Measurements .12
9.4 Determination of daily noise exposure levels by job for workers in a homogenous
exposure group .12
9.5 Validation of the measurement result .12
10 Strategy 3 – Full day measurement.12
10.1 Introduction.12
10.2 Observing work activities and monitoring measurements.13
10.3 Measurements .13
10.4 Determination of daily noise exposure level .13
11 Measurements and calculations.14
11.1 Selection of instrumentation.14
11.2 Calibration check.14
11.3 Instrument worn by the worker.14
11.4 Integrating sound level meter .15
12 Sources of uncertainty.15
12.1 General.15
© ISO 2007 – All rights reserved iii

---------------------- Page: 6 ----------------------
ISO/DIS 9612
12.2 Mechanical impacts on microphone. 16
12.3 Wind and airflows . 16
12.4 Relevant and non-relevant sound contributions. 17
13 Calculation of measurement uncertainties and presentation of the final results. 17
14 Information to be reported. 17
Annex A (informative) Symbols and abbreviated terms. 20
Annex B (informative) Example of a check-list to ensure that significant events are detected
during the work analysis. 22
Annex C (informative) Guide to the selection of measurement strategy . 23
C.1 General. 23
C.2 Strategy 1 – Task-based measurement . 23
C.3 Strategy 2 – Job-based measurement. 23
C.4 Differences and similarities between task-based and job-based measurement . 24
C.5 Strategy 3 – Full day measurement . 24
C.6 Using more than one measurement strategy . 25
C.7 Selection of measurement strategy for different work patterns. 25
Annex D (normative) Evaluation of measurement uncertainties . 27
D.1 General. 27
D.2 Determination of the expanded combined uncertainty for the task-based method. 28
D.2.1 Functional relationship for the task-based method. 28
D.2.2 Contribution to measurement uncertainty and uncertainty budget. 29
D.2.3 Calculation of the combined standard uncertainty, u, and the expanded uncertainty U. 30
D.3 Determination of the expanded uncertainty for the job-based method and the full day
method. 31
D.3.1 Functional relationship for the job-based method.31
D.3.2 Contribution to measurement uncertainty and uncertainty budget. 31
D.3.3 Uncertainty contribution c u associated to job sampling . 32
1 1
D.3.4 Calculation of the combined standard uncertainty, u, and the expanded uncertainty, U . 33
D.3.5 Uncertainty calculation for the full day method . 33
D.4 Standard uncertainty for the measuring instrumentation used, u . 34
2
D.5 Standard uncertainty due to imperfect selection of measurement positions u . 34
3
Annex E (informative) An example showing the calculation of daily noise exposure level using the
task-based measurements. 35
E.1 Step 1: Work analysis. 35
E.2 Step 2: Selection of strategy . 36
E.3 Step 3: Measurements. 36
E.4 Step 4: Error handling . 36
E.5 Step 5: Calculation and presentation of the results and uncertainty. 36
E.5.1 Calculation of daily noise exposure level . 36
E.5.2 Calculation of standard uncertainty . 37
E.5.3 Conclusions . 38
Annex F (informative) An example showing the calculation of daily noise exposure level using the
job-based measurements . 39
F.1 General. 39
F.2 Step 1: Work analysis. 39
F.3 Step 2: Selection of strategy . 39
F.4 Step 3: Measurements. 39
F.5 Step 4: Error handling . 40
F.6 Step 5: Calculation and presentation of the results and uncertainty. 40
F.6.1 Calculation of daily noise exposure level and uncertainty . 40
F.6.2 Final result. 41
F.6.3 Conclusions . 41
Annex G (informative) An example showing the calculation of daily noise exposure level using
full day measurements. 42
G.1 General. 42
iv © ISO 2007 – All rights reserved

---------------------- Page: 7 ----------------------
ISO/DIS 9612
G.2 Step 1: Work analysis .42
G.3 Step 2: Selection of strategy .42
G.4 Step 3: Measurements .42
G.4.1 Measurement plan.42
G.4.2 Observing work activities and monitoring measurements.42
G.5 Step 4: Error handling.42
G.6 Step 5: Calculation and presentation of results and uncertainty.42
G.6.1 Measurement results.42
G.6.2 Calculation of daily noise exposure level.42
G.6.3 Calculation of uncertainty .42
G.6.4 Conclusions .42
Bibliography.42

© ISO 2007 – All rights reserved v

---------------------- Page: 8 ----------------------
ISO/DIS 9612
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 9612 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
This second edition cancels and replaces the first edition (ISO 9612:1997) which has been technically totally
revised.
vi © ISO 2007 – All rights reserved

---------------------- Page: 9 ----------------------
ISO/DIS 9612
Introduction
This International Standard provides a stepwise approach for the determination of noise exposure level at
work places from measurements. The procedure contains the following major steps: work analysis, selection
of measurement strategy, measurements, error handling and uncertainty evaluations, calculations and
presentation of results. The standard describes three different measurement strategies, i.e. task-based
measurement, job-based measurement and full day measurement. The choice of the measurement strategy
depends on the complexity of the work situation and the purpose of measurements. A guide on the selection
of strategy is given.
This International Standard recognizes the use of hand-held sound level meters as well as personal sound
exposure meters. The methods described, optimize the effort required for obtaining a given accuracy.
© ISO 2007 – All rights reserved vii

---------------------- Page: 10 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 9612

Acoustics — Determination of occupational noise exposure —
Engineering method
1 Scope
This International Standard specifies an engineering method for measuring workers’ exposure to noise in a
working environment and calculating the noise exposure level. This standard describes three different
strategies for measurement. This method will be useful where a determination of noise exposure to
engineering precision grade is required, for example, for detailed noise exposure studies or epidemiological
studies in to the cause of hearing damage or other adverse effects.
The measuring process requires observation and analysis of the noise exposure conditions so that the quality
of the measurements can be controlled. This International Standard provides methods for estimating the
uncertainty of the results.
This International Standard is not intended for assessment of masking of oral communication or assessment
of infrasound, ultrasound and non-auditory effects of noise. It does not apply to the measurement of the noise
exposure of the protected ear when hearing protectors are worn.
Results of the measurements performed in accordance with this International Standard may provide useful
information when defining priorities for noise control measures.
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.
ISO 1999, Acoustics – Determination of occupational noise exposure and estimation of noise-induced hearing
impairment
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
IEC 60942, Electroacoustics – Sound calibrators
IEC 61672-1, Electroacoustics – Sound level meters – Part 1: Specifications
IEC 61252, Electroacoustics – Specifications for personal sound exposure meters
1)
ISO Guide 98:1995, Guide to the expression of uncertainty in measurement

1) Formerly known as Guide to the expression of uncertainty in measurement (GUM).
© ISO 2007 – All rights reserved 1

---------------------- Page: 11 ----------------------
ISO/DIS 9612
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply:
3.1
equivalent continuous A-weighted sound pressure level
L
pAeq,T
level, in decibels, given by the equation:
T

1
2
pt()dt

A

T
0

L = 10lg dB
pTAeq, 2

p
0



where
T is the period over which the average is taken;
p is the A-weighted sound pressure;
A
p , is the reference value, p = 20 µPa.
0 0
3.2
noise exposure level normalized to a nominal 8 h working day
L
EX,8h
level, in decibels, given by the equation:

T
e
LL=+10lg dB
EX,8h pTAeq, 
e
T
0
where
L is the equivalent continuous A-weighted sound pressure level;
pAeq,T
e
T is the effective duration of the working day;
e
T is the reference duration, T = 8 h.
0 0
NOTE 1 If the effective duration of the working day T is equal to 8 h then L equals L . The quantity “noise
e EX,8h Aeq,8h
p
exposure level normalized to a nominal 8 h working day” may also be called “daily noise exposure level”.
NOTE 2 If the exposure averaged over n days is desired, for example if noise exposure levels normalized to a nominal
8 h working day for weekly exposures are considered, the average value of L , in decibels, over the whole period may
EX,8h
be determined from the values of (L ) for each day, using the following equation:
EX,8h
i
n
1 01,L×()
EX,8h
i
L = 10lg 10 dB

EX,8h
k
i=1
The value of k is chosen according to the purpose of the averaging process: it will be equal to n if an average value is
desired; it will be a conventional fixed number if the exposure is to be normalized to a nominal number of days (for
example, k = 5 will lead to a daily noise exposure level normalized to a nominal week of 5 eight-hour working days).
3.3
nominal day
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.