SIST EN ISO 14509-1:2008
(Main)Small craft - Airborne sound emitted by powered recreational craft - Part 1: Pass-by measurement procedures (ISO 14509-1:2008)
Small craft - Airborne sound emitted by powered recreational craft - Part 1: Pass-by measurement procedures (ISO 14509-1:2008)
This part of ISO 14509 specifies the conditions for obtaining reproducible and comparable measurement results of the maximum sound pressure level of airborne sound generated during the passage of powered recreational craft of up to 24 m length of hull, including inboards, stern drives, personal watercraft (PWC) and outboard motors. It also specifies standard craft based type tests for stern drives with integral exhaust systems and for outboard motors. It also specifies the procedure to be followed if, in addition to the maximum sound pressure level, the determination of the sound exposure level is desired.
Kleine Wasserfahrzeuge - Von motorgetriebenen Sportbooten abgestrahlter Luftschall - Teil 1: Vorbeifahrtmessungen (ISO 14509-1:2008)
Dieser Teil von ISO 14509 legt die Bedingungen für reproduzierbare und vergleichbare Messungen des
maximalen Schalldruckpegels fest, der während der Vorbeifahrt von motorgetriebenen Sportbooten von bis zu
24 m Länge erzeugt wird. Eingeschlossen sind Boote mit Einbaumotor, Boote mit Z-Antrieb, Wassermotorräder
(Jet-Ski) und Außenbordmotoren. Er legt darüber hinaus Abnahmeprüfungen mit einem Normboot
für Z-Antriebe mit integriertem Auspuffsystem und für Außenbordmotoren fest. In Anhang A ist ein Verfahren
beschrieben, nach dem der Schallexpositionspegel zu messen ist, falls seine Bestimmung zusätzlich zum
maximalen Schalldruckpegel gewünscht ist.
ANMERKUNG Für Schallemissionsmessungen an anderen als den oben beschriebenen Booten gilt ISO 2922.
Das in diesem Teil von ISO 14509 beschriebene akustische Messverfahren ist von der Genauigkeitsklasse
„Laborverfahren“ (Genauigkeitsklasse 2).
Petits navires - Bruit aérien émis par les bateaux de plaisance motorisés - Partie 1: Méthodes de mesure pour l'essai de passage (ISO 14509-1:2008)
L'ISO 14509-1:2008 spécifie les conditions d'obtention de résultats de mesures reproductibles et comparables relatifs au niveau maximum de pression acoustique du bruit aérien provoqué lors du passage de bateaux de plaisance motorisés dont la coque ne dépasse pas 24 m de longueur, y compris les moteurs intérieurs, les moteurs à embase de propulsion arrière, les scooters de mer (PWC) et les moteurs hors-bord. Elle spécifie également les essais de type basés sur des bateaux standard pour les moteurs à embase arrière de propulsion avec système d'échappement intégré et pour les moteurs hors-bord. Elle spécifie enfin les procédures à observer lorsque l'on souhaite déterminer le niveau d'exposition sonore en plus du niveau maximal de pression sonore.
La classe de précision des modes opératoires d'essais acoustiques spécifiés dans l'ISO 14509-1:2008 est la classe d'ingénierie (classe 2).
Mala plovila - Merjenje zvoka v zraku, ki ga oddajajo motorizirana rekreacijska plovila - 1. del: Postopki merjenja pri vožnji mimo (ISO 14509-1:2008)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 14509-1:2008
01-december-2008
1DGRPHãþD
SIST EN ISO 14509:2001
SIST EN ISO 14509:2001/A1:2004
Mala plovila - Merjenje zvoka v zraku, ki ga oddajajo motorizirana rekreacijska
plovila - 1. del: Postopki merjenja pri vožnji mimo (ISO 14509-1:2008)
Small craft - Airborne sound emitted by powered recreational craft - Part 1: Pass-by
measurement procedures (ISO 14509-1:2008)
Kleine Wasserfahrzeuge - Von motorgetriebenen Sportbooten abgestrahlter Luftschall -
Teil 1: Vorbeifahrtmessungen (ISO 14509-1:2008)
Petits navires - Bruit aérien émis par les bateaux de plaisance motorisés - Partie 1:
Méthodes de mesure pour l'essai de passage (ISO 14509-1:2008)
Ta slovenski standard je istoveten z: EN ISO 14509-1:2008
ICS:
17.140.30 Emisija hrupa transportnih Noise emitted by means of
sredstev transport
47.080 ýROQL Small craft
SIST EN ISO 14509-1:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 14509-1:2008
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SIST EN ISO 14509-1:2008
EUROPEAN STANDARD
EN ISO 14509-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2008
ICS 17.140.30; 47.080 Supersedes EN ISO 14509:2000
English Version
Small craft - Airborne sound emitted by powered recreational
craft - Part 1: Pass-by measurement procedures (ISO 14509-
1:2008)
Petits navires - Bruit aérien émis par les bateaux de Kleine Wasserfahrzeuge - Von motorgetriebenen
plaisance motorisés - Partie 1: Méthodes de mesure pour Sportbooten abgestrahlter Luftschall - Teil 1:
l'essai de passage (ISO 14509-1:2008) Vorbeifahrtmessungen (ISO 14509-1:2008)
This European Standard was approved by CEN on 24 August 2008.
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: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14509-1:2008: E
worldwide for CEN national Members.
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SIST EN ISO 14509-1:2008
EN ISO 14509-1:2008 (E)
Contents Page
Foreword.3
Annex ZA (informative) Relationship between this International Standard and the Essential
Requirements of EU Directive 94/25/EC as amended by 2003/44/EC.4
2
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SIST EN ISO 14509-1:2008
EN ISO 14509-1:2008 (E)
Foreword
This document (EN ISO 14509-1:2008) has been prepared by Technical Committee ISO/TC 188 "Small craft"
in collaboration with Technical Committee CEN/SS T01 “Shipbuilding and maritime structures” the secretariat
of which is held by CMC.
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 April 2009, and conflicting national standards shall be withdrawn at the
latest by April 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.
This document supersedes EN ISO 14509:2000.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EC Directive.
For relationship with EC Directive, see informative Annex ZA, which is an integral part of this document.
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 14509-1:2008 has been approved by CEN as a EN ISO 14509-1:2008 without any
modification.
3
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SIST EN ISO 14509-1:2008
EN ISO 14509-1:2008 (E)
Annex ZA
(informative)
Relationship between this International Standard and the Essential
Requirements of EU Directive 94/25/EC as amended by 2003/44/EC
This International Standard has been prepared under a mandate given to CEN by the European Commission
to provide one means of conforming to Essential Requirements of the New Approach Directive 94/25/EC as
amended by Directive 2003/44/EC.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a
presumption of conformity with the corresponding Essential Requirements of that Directive and associated
EFTA regulations.
Table ZA.1 — Correspondence between this International Standard and Directive 94/25/EC as
amended by 2003/44/EC
Clause(s)/sub-clause(s) of Essential requirements (ERs) of EU Qualifying remarks/Notes
this International Standard Directive 94/25/EC as amended by
2003/44/EC
All clauses Annex 1.C, Essential requirements for ISO 14509-1 defines a boat pass-
noise emissions Clause 1.1 by test for measurement of noise
emissions of recreational craft
WARNING: Other requirements and other EU Directives may be applicable to the products falling within the
scope of this standard.
4
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SIST EN ISO 14509-1:2008
INTERNATIONAL ISO
STANDARD 14509-1
First edition
2008-10-01
Small craft — Airborne sound emitted
by powered recreational craft —
Part 1:
Pass-by measurement procedures
Petits navires — Bruit aérien émis par les bateaux de plaisance
motorisés —
Partie 1: Méthodes de mesure pour l'essai de passage
Reference number
ISO 14509-1:2008(E)
©
ISO 2008
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SIST EN ISO 14509-1:2008
ISO 14509-1:2008(E)
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Published in Switzerland
ii © ISO 2008 – All rights reserved
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SIST EN ISO 14509-1:2008
ISO 14509-1:2008(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 1
4 Symbols. 3
5 Measurement quantity. 3
6 Measurement uncertainty. 3
7 Measuring equipment. 5
8 Test site specifications and environmental conditions. 5
9 Test course, microphone positions and measurement distance . 6
10 Operating conditions. 8
11 Test procedure. 9
12 Test report. 9
13 Standard craft specifications for outboard motor type tests according to Clause 10 . 10
14 Standard craft specifications for type tests for stern drives with integral exhaust systems
according to Clause 10. 11
Annex A (normative) Measurement of the sound exposure level. 12
Annex B (informative) Example of test report form . 16
Bibliography . 18
Figures
Figure 1 — Position of the microphone and test course. 7
Figure 2 — Microphone position and heights. 7
Tables
Table 1 — Standard deviation of reproducibility of individual sources of measurement. 4
Table 2 — Variability for a coverage probability of 90 %. 4
Table 3 — Correction for background sound pressure level, L″ , for monitoring tests. 6
pAS
Table 4 — Standard craft specifications . 10
Table 5 — Standard craft specifications for petrol engines. 11
Table 6 — Standard craft specifications for diesel engines. 11
Table A.1 — Standard deviation of reproducibility of individual sources of measurement. 12
Table A.2 — Variability for a coverage probability of 90 % . 13
Table A.3 — Correction for background sound exposure level, L″ , for monitoring tests . 14
AE
© ISO 2008 – All rights reserved iii
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SIST EN ISO 14509-1:2008
ISO 14509-1:2008(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 14509-1 was prepared by Technical Committee ISO/TC 188, Small craft.
This first edition of ISO 14509-1 cancels and replaces ISO 14509:2000, which has been technically revised. It
also incorporates the Amendment ISO 14509:2000/Amd.1:2004.
ISO 14509 consists of the following parts, under the general title Small craft — Airborne sound emitted by
powered recreational craft:
⎯ Part 1: Pass-by measurement procedures
⎯ Part 2: Sound assessment using reference craft
⎯ Part 3: Sound assessment using calculation and measurement procedures
iv © ISO 2008 – All rights reserved
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SIST EN ISO 14509-1:2008
INTERNATIONAL STANDARD ISO 14509-1:2008(E)
Small craft — Airborne sound emitted by powered recreational
craft —
Part 1:
Pass-by measurement procedures
1 Scope
This part of ISO 14509 specifies the conditions for obtaining reproducible and comparable measurement
results of the maximum sound pressure level of airborne sound generated during the passage of powered
recreational craft of up to 24 m length of hull, including inboards, stern drives, personal watercraft (PWC) and
outboard motors. It also specifies standard craft based type tests for stern drives with integral exhaust
systems and for outboard motors. It also specifies the procedure to be followed if, in addition to the maximum
sound pressure level, the determination of the sound exposure level is desired.
NOTE For craft other than those specified above, ISO 2922 is applicable for sound emission measurements.
The accuracy grade of the acoustical test procedures specified in this part of ISO 14509 is engineering grade
(grade 2).
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 8665, Small craft — Marine propulsion reciprocating internal combustion engines — Power measurements
and declarations
ISO 8666:2002, Small craft — Principal data
ISO 10087, Small craft — Craft identification — Coding system
IEC 60942, Electroacoustics — Sound calibrators
IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
type test for recreational craft
type test
measurement performed to prove that the sound of the craft in motion, or of the outboard motor when using a
standard craft, or of the stern drive with integral exhaust system when using a standard craft, complies with
sound specifications or prescribed limits
NOTE See also definition of “acceptance test” in ISO 2922.
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SIST EN ISO 14509-1:2008
ISO 14509-1:2008(E)
3.2
monitoring test for recreational craft
monitoring test
measurement performed in order to check that the sound of the craft in motion, or of the outboard motor when
using any craft, or of the stern drive with integral exhaust system when using any craft, is still within prescribed
limits and that no noticeable changes have occurred since the acceptance on initial delivery or after
modification, as applicable
NOTE 1 Subsequent type testing can also be required in the case of a significant change.
NOTE 2 See also definition of “monitoring test” in ISO 2922.
3.3
maximum A-frequency weighted sound pressure level with time weighting S for recreational craft
maximum AS-weighted sound pressure level
L
pASmax
maximum sound pressure level achieved from measurement of the passage of the craft under specified
operating conditions measured with frequency weighting A and with time weighting S (slow) according to
IEC 61672-1
NOTE It is expressed in decibels (dB).
3.4
A-weighted sound exposure
E
A,T
integral of the square of the A-weighted sound pressure, p, over a stated time interval or event of duration T
(starting at t and ending at t )
1 2
t
2
2
E = pt dt (1)
()
A,T A
∫
t
1
2
NOTE 1 Unit: pascal squared second, Pa s.
2
NOTE 2 By practical limitations of the measuring instruments, p is always understood to denote the square of a
frequency-weighted and frequency-band-limited sound pressure. The application of a specific frequency weighting as
specified in IEC 61672-1 is indicated by an appropriate subscript, e.g. E denotes the A-weighted sound exposure over
A,1h
one hour.
NOTE 3 When applied to a single event of impulsive or intermittent sound, the quantity is called “single event sound
exposure” and the symbol E is used without subscript.
NOTE 4 This definition applies only for the optional measurement of sound exposure levels according to Annex A.
NOTE 5 Adapted from ISO/TR 25417:2007, 2.6.
3.5
A-weighted sound exposure level
L
E,A,T
ten times the logarithm to the base 10 of the ratio of the A-weighted sound exposure, E , to a reference
A,T
value, E , expressed in decibels
0
⎛⎞E
A,T
L = 10 lg dB (2)
⎜⎟
ET,A,
⎜⎟
E
⎝⎠0
2 −10
NOTE 1 The reference value, E , is (20 µPa) s = 4 × 10 Pa s.
0
NOTE 2 The application of a specified frequency weighting as specified in IEC 61672-1 is indicated by an appropriate
subscript, e.g. L denotes the A-weighted sound exposure level over one hour.
E,A,T,1h
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SIST EN ISO 14509-1:2008
ISO 14509-1:2008(E)
NOTE 3 When applied to a single event of impulsive or intermittent sound, the quantity is called “single event sound
exposure level” and the symbol L is used without further subscript.
E
NOTE 4 In this part of ISO 14509, the sound exposure level is to characterize the emission of the source and not the
noise impact on people exposed to the sound.
NOTE 5 This definition applies only for the optional measurement of sound exposure level according to Annex A.
NOTE 6 Adapted from ISO/TR 25417:2007, 2.6.
3.6
background noise for recreational craft
background noise
noise from all sources other than the craft under test
EXAMPLE Noise from waves splashing on the measuring craft or the shore, other craft or equipment, and wind
effects.
3.7
stern-drive
propulsion unit with the engine inboard and the transmission/drive located external to the hull
3.8
stern-drive with integral exhaust systems
stern-drive where the exhaust gases are expelled through the transmission/drive
4 Symbols
L′ maximum AS-weighted sound pressure level during the passage, expressed in decibels (dB);
pASmax
L″ AS-weighted background sound pressure level, expressed in decibels (dB);
pAS
L L′ after applying background noise correction according to 8.3 and distance correction
pASmax pASmax
according to 9.2, expressed in decibels (dB);
L′ A-weighted sound exposure level during the passage, expressed in decibels (dB);
AE
L″ A-weighted background sound exposure level, expressed in decibels (dB);
AE
L L′ after applying background noise correction according to A.5 and distance correction according
AE AE
to A.6, expressed in decibels (dB).
5 Measurement quantity
The quantity to be measured during the passage of the craft is the maximum AS-weighted sound pressure
level, L′ .
pASmax
From this quantity, the maximum AS-weighted sound pressure level, L , is determined by applying the
pASmax
background noise correction and distance correction, if applicable.
6 Measurement uncertainty
The measurement procedure specified in the following clauses is affected by several parameters
(e.g. measurement system uncertainty, environmental conditions, craft course uncertainty) that can lead to
variation in the level recorded for a given craft.
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SIST EN ISO 14509-1:2008
ISO 14509-1:2008(E)
In the absence of sufficient experimental data on the overall uncertainty, the uncertainty associated with this
part of ISO 14509 has been evaluated by the procedure given in the Guide to the expression of uncertainty in
measurement (GUM) (see Bibliography), where each individual source of uncertainty is identified and
quantified based upon existing statistical data or engineering judgment.
The individual sources of uncertainty identified, with their standard deviations, are given in Table 1.
Table 1 — Standard deviation of reproducibility of individual sources of measurement
Individual standard deviations of the maximum
Individual sources of uncertainty AS-weighted sound pressure level, L
ASmax
dB
Distance effects 0,3
Measuring equipment 1,0
Environmental conditions 1,5
Operator effects 0,2
Test site variations 1,0
These individual sources of uncertainty are grouped as follows.
a) Run-to-run: the variations expected within a single test series.
b) Day-to-day: the variations expected within the same test site, but over more than a single test series and
including a) above.
c) Site-to-site: the variation expected across different test sites and test personnel and including a) and b)
above.
The expanded uncertainty for the combined standard uncertainties for these three groups, for a coverage
probability of 90 %, is given in Table 2.
Table 2 — Variability for a coverage probability of 90 %
Variability case Expanded uncertainty
dB
Run-to-run 0,3
Day-to-day 1,8
Site-to-site 2,1
NOTE In addition to the above uncertainties, a further uncertainty needs to be considered in the case of multi-
engined craft. If the sound of a specific multi-engined craft is dominated by exhaust noise, the phasing of its engines,
when running at nominally the same engine speed, can have a significant effect upon the vessel’s pass by noise. Extreme
examples of maximum AS-weighted sound pressure levels of up to 6 dB of the variability have been recorded.
The uncertainties considered in this part of ISO 14509 do not cover the uncertainties associated with the
variation in the production process for a specific craft.
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SIST EN ISO 14509-1:2008
ISO 14509-1:2008(E)
7 Measuring equipment
7.1 Equipment specifications
The instrumentation system, including microphones and cables (which shall be used according to the
manufacturer’s specifications), and including the windscreen recommended by the manufacturer and the
overall electroacoustic performance of any additional measuring equipment, including for example a tape
recorder and/or level recorder, shall meet the requirements for a class 1 instrument specified in IEC 61672-1.
NOTE Sound level meters with “maximum hold” capabilities are preferred.
When a tape recorder is used for the measurements, the dynamic range of the instrumentation shall be
consistent with the measured signal.
A wind speed anemometer which has an uncertainty of less than ± 10 % shall be used.
An engine speed tachometer which has an uncertainty of less than ± 2 % shall be used.
7.2 Equipment calibration
A class 1 sound calibrator which meets the requirements of IEC 60942 shall be used.
The overall acoustic performance of the measurement equipment shall be checked with the sound calibrator
according to the instructions of its manufacturer at the beginning and at the end of each series of measurements,
at least every four hours during testing and at the beginning and end of each measurement day.
At intervals of no longer than two years, the sound level meter shall undergo laboratory verification for
compliance with IEC 61672-1. The date of the last verification of compliance with IEC 61672-1 shall be
recorded.
The sound calibrator used for calibration of the sound level meter shall undergo laboratory verification every
year with traceability to a laboratory, using national standards.
8 Test site specifications and environmental conditions
8.1 Test site specifications
Within 30 m around the craft under test and the microphone, there shall be no large surfaces (e.g. retaining
walls, building façades, rocks, bridges) from which sound can be reflected back to the microphone.
In the vicinity of the microphone, there shall be no obstacles which could disturb the sound field. Therefore, no
person shall be between the microphone and the sound source, and any observers shall be in such a position
that any influence on the meter reading is avoided.
The area between the craft under test and the measurement microphone shall be open water and free from
any sound absorbing or sound reflecting objects that can affect the measurement.
At the test course, the depth of water shall be sufficient for normal operation of the craft.
NOTE Shallow water can increase the reading of the pass-by sound pressure level.
8.2 Environmental conditions
8.2.1 The wind velocity in the test area during the pass-by shall not exceed 7 m/s.
8.2.2 Tests shall not be carried out in conditions of rain or other precipitation.
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SIST EN ISO 14509-1:2008
ISO 14509-1:2008(E)
8.2.3 The wave height in the test area during the pass-by shall not exceed H according to Equation (3) or
0,1 m, whichever is the greater.
H = L /50 (3)
wl
where L is the length of the waterline according to ISO 8666.
wl
NOTE The sound of any wave impact (slamming) could lead to a considerable increase of the measured sound
pressure level.
8.3 Background noise
8.3.1 General
A measurement shall be invalid if changes in the background noise affect the applicable reading.
8.3.2 Type tests
For type tests, the AS-weighted background sound pressure level, L″ , shall be at least 10 dB below the
pAS
maximum AS-weighted sound pressure level, L′ , obtained during the passage of the craft.
pASmax
8.3.3 Monitoring tests
For monitoring tests, the AS-weighted background sound pressure level, L″ , shall be at least 6 dB below
pAS
the maximum AS-weighted sound pressure level, L′ , obtained during the passage of the craft. The
pASmax
reading shall then be corrected as shown in Table 3.
Table 3 — Correction for background sound pressure level, L″ , for monitoring tests
pAS
Values in decibels
Increase in the indication of the AS-weighted sound Correction to be applied to the reading of
pressure level obtained during the passage of the craft, the AS-weighted sound pressure level, L′ ,
pASmax
L′ − L″ obtained during the passage of the craft
pASmax pAS
W 10 0
6 to 9 −1
9 Test course, microphone positions and measurement distance
9.1 General
9.1.1 The test course to be followed shall be a straight line such that the distance between the microphone
+2
and the side of the craft nearest to the microphone when passing it shall be 25 m .
( )
0
The microphone shall be orientated to the path of the craft in accordance with the manufacturer’s
recommendation for the microphone and associated equipment type.
NOTE Figure 1 gives information on the test site dimensions.
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SIST EN ISO 14509-1:2008
ISO 14509-1:2008(E)
Dimensions in metres
Key
1 craft
2 microphone
a
Craft course line.
Figure 1 — Position of the microphone
...
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