Acoustics - Noise from shooting ranges - Part 1: Determination of muzzle blast by measurement (ISO 17201-1:2018)

This document specifies a method to determine the acoustic source energy of the muzzle blast for calibres of less than 20 mm or explosive charges of less than 50 g TNT equivalent. It is applicable at distances where peak pressures less than 1 kPa (equivalent to a peak sound pressure level of 154 dB) are observed. The source energy, directivity of the source and their spectral structure determined by this procedure can be used as input data to sound propagation programmes, enabling the prediction of shooting noise in the neighbourhood of shooting ranges. Additionally, the data can be used to compare sound emission from different types of guns or different types of ammunition used with the same gun.
This document is applicable to guns used in civil shooting ranges but it can also be applied to military guns. It is not applicable to the assessment of hearing damage or sound levels in the non-linear region.
Suppressors and silencers are not taken into consideration in this document.

Akustik - Geräusche von Schießplätzen - Teil 1: Bestimmung des Mündungsknalls durch Messung (ISO 17201-1:2018)

Dieses Dokument legt ein Verfahren zur Bestimmung der akustischen Schallenergie des Mündungsknalls für Kaliber kleiner als 20 mm und Treibladungen von weniger als 50 g TNT Äquivalent fest. Das Verfahren ist in Entfernungen anwendbar, in denen Spitzenwerte der Schalldrücke von weniger als 1 kPa (äquivalent zu einem Spitzenschalldruckpegel von 154 dB) beobachtet werden. Die nach diesem Verfahren ermittelte Schallenergie, die Richtwirkung der Quelle und deren spektrale Zusammensetzung können als Eingangsdaten für Schall¬ausbreitungsprogramme verwendet werden, mit denen die Prognose von Schießgeräuschen in der Nachbarschaft von Schießplätzen ermöglicht wird. Zusätzlich können die Daten zum Vergleich der Schallemission verschiedener Arten von Schusswaffen oder verschiedener Arten von Munition mit derselben Waffe verwendet werden.
Dieses Dokument ist anwendbar für Schusswaffen ziviler Schießplätze und kann auch auf militärische Schusswaffen angewendet werden. Es ist nicht anwendbar zur Beurteilung von Gehörschädigungen oder Schall¬pegeln innerhalb des nichtlinearen Bereichs.
Suppressoren und Schalldämpfer werden in diesem Dokument nicht berücksichtigt.

Acoustique - Bruit des stands de tir - Partie 1: Mesurage de l´énergie sonore en sortie de bouche (ISO 17201-1:2018)

Le présent document spécifie une méthode permettant de déterminer l'énergie acoustique émise en sortie de bouche pour des armes de calibres inférieurs à 20 mm ou des charges explosives de moins de 50 g d'équivalent TNT. Elle est applicable à des distances où les valeurs de crête de pression acoustique observées sont inférieures à 1 kPa (équivalent à un niveau de pression acoustique de crête de 154 dB). L'énergie sonore émise, la directivité de la source et leur structure spectrale, déterminées par ce mode opératoire, peuvent être utilisées en tant que données d'entrée pour les modes de propagation du son permettant la prédiction du bruit généré par les tirs au voisinage des stands de tir. En outre, les données peuvent servir à comparer le bruit émis par différents types d'armes ou différents types de munitions utilisées par la même arme.
Le présent document concerne les armes utilisées dans les stands de tir, mais elle peut également s'appliquer aux armes à usage militaire. Elle n'est pas applicable pour les besoins d'une évaluation des dommages auditifs ou des niveaux sonores dans la zone non linéaire.
Les suppresseurs et silencieux ne sont pas pris en considération dans le présent document.

Akustika - Hrup s strelišč - 1. del: Določanje poka potisnih plinov iz ustja strelnih orožij z merjenjem (ISO 17201-1:2018)

Ta dokument določa metodo za določanje energije akustičnega vira poka potisnih plinov iz ustja strelnih orožij za kalibre, manjše od 20 mm, ali eksplozivne naboje, enakovredne manj kot 50 g TNT. Uporablja se pri razdaljah, pri katerih so vršni tlaki manjši od 1 kPa (enako vršni ravni zvočnega tlaka 154 dB). Energijo vira, usmerjenost vira in njegovo spektralno strukturo, določeno s tem postopkom, je mogoče uporabiti kot vhodne podatke za programe širjenja zvoka, kar omogoča napoved hrupa streljanja v bližini strelišč. Poleg tega je mogoče podatke uporabiti za primerjavo zvočnih emisij različnih vrst strelnega orožja ali različnih vrst streliva, uporabljenega pri istem strelnem orožju.
Ta dokument se uporablja za strelno orožje, ki se uporablja na civilnih streliščih, vendar ga je mogoče uporabiti tudi za vojaško
strelno orožje. Ne uporablja se za ocenjevanje poškodb sluha ali ravni zvoka v nelinearnem območju.
Dušilci v tem dokumentu niso upoštevani.

General Information

Status
Published
Publication Date
18-Dec-2018
Technical Committee
Drafting Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
19-Dec-2018
Completion Date
19-Dec-2018

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SLOVENSKI STANDARD
SIST EN ISO 17201-1:2019
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SIST EN ISO 17201-1:2005
SIST EN ISO 17201-1:2005/AC:2009

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Acoustics - Noise from shooting ranges - Part 1: Determination of muzzle blast by

measurement (ISO 17201-1:2018)

Akustik - Geräusche von Schießplätzen - Teil 1: Bestimmung des Mündungsknalls durch

Messung (ISO 17201-1:2018)

Acoustique - Bruit des stands de tir - Partie 1: Mesurage de l´énergie sonore en sortie de

bouche (ISO 17201-1:2018)
Ta slovenski standard je istoveten z: EN ISO 17201-1:2018
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
95.020 Vojaštvo na splošno Military in general
97.220.10 Športni objekti Sports facilities
SIST EN ISO 17201-1:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 17201-1:2019
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SIST EN ISO 17201-1:2019
EN ISO 17201-1
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2018
EUROPÄISCHE NORM
ICS 17.140.20; 95.020; 97.220.10 Supersedes EN ISO 17201-1:2005
English Version
Acoustics - Noise from shooting ranges - Part 1:
Determination of muzzle blast by measurement (ISO
17201-1:2018)

Acoustique - Bruit des stands de tir - Partie 1: Akustik - Geräusche von Schießplätzen - Teil 1:

Mesurage de l´énergie sonore en sortie de bouche (ISO Bestimmung des Mündungsknalls durch Messung (ISO

17201-1:2018) 17201-1:2018)
This European Standard was approved by CEN on 12 November 2018.

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-CENELEC 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-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17201-1:2018 E

worldwide for CEN national Members.
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SIST EN ISO 17201-1:2019
EN ISO 17201-1:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 17201-1:2019
EN ISO 17201-1:2018 (E)
European foreword

This document (EN ISO 17201-1:2018) 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 DIN.

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 June 2019, and conflicting national standards shall be

withdrawn at the latest by June 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 17201-1:2005.

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,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 17201-1:2018 has been approved by CEN as EN ISO 17201-1:2018 without any

modification.
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SIST EN ISO 17201-1:2019
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SIST EN ISO 17201-1:2019
INTERNATIONAL ISO
STANDARD 17201-1
Second edition
2018-11
Acoustics — Noise from shooting
ranges —
Part 1:
Determination of muzzle blast by
measurement
Acoustique — Bruit des stands de tir —
Partie 1: Mesurage de l´énergie sonore en sortie de bouche
Reference number
ISO 17201-1:2018(E)
ISO 2018
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SIST EN ISO 17201-1:2019
ISO 17201-1:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 17201-1:2019
ISO 17201-1:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Gun and ammunition ....................................................................................................................................................................................... 5

4.1 General ........................................................................................................................................................................................................... 5

4.2 Gun .................................................................................................................................................................................................................... 5

4.3 Ammunition ............................................................................................................................................................................................... 6

4.4 Ballistic parameters ............................................................................................................................................................................ 7

4.5 Test situation ............................................................................................................................................................................................ 8

4.6 Other features .......................................................................................................................................................................................... 8

5 Basic concept for measurement and analysis ........................................................................................................................ 8

5.1 General ........................................................................................................................................................................................................... 8

5.2 Quantity to be measured .............................................................................................................................................................10

5.3 Angular source energy distribution level .....................................................................................................................10

5.4 Interpolated angular source energy distribution level .....................................................................................11

5.5 Source energy level ..........................................................................................................................................................................11

5.6 Directivity .................................................................................................................................................................................................11

6 Measurement site .............................................................................................................................................................................................12

6.1 Site ..................................................................................................................................................................................................................12

6.2 Weather conditions ..........................................................................................................................................................................12

7 Measurement planning ...............................................................................................................................................................................12

7.1 General remarks .................................................................................................................................................................................12

7.2 Gun .................................................................................................................................................................................................................12

7.3 Measurement position...................................................................................................................................................................12

7.4 Measurement equipment ............................................................................................................................................................13

7.5 Dealing with projectile sound .................................................................................................................................................13

8 Calibration and validation .......................................................................................................................................................................13

9 Measurement procedures ........................................................................................................................................................................14

9.1 General ........................................................................................................................................................................................................14

9.2 Ground reflection correction ...................................................................................................................................................14

10 Control of measurement layout .........................................................................................................................................................14

11 Measurement uncertainty .......................................................................................................................................................................15

11.1 General ........................................................................................................................................................................................................15

11.2 Empirical part .......................................................................................................................................................................................15

12 Report ...........................................................................................................................................................................................................................16

Annex A (informative) Small arms glossary ...............................................................................................................................................17

Annex B (informative) Example ..............................................................................................................................................................................28

Annex C (informative) Guidance on the measurement uncertainty .................................................................................36

Bibliography .............................................................................................................................................................................................................................39

© ISO 2018 – All rights reserved iii
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SIST EN ISO 17201-1:2019
ISO 17201-1:2018(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.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.

This second edition cancels and replaces the first edition (ISO 17201-1:2005), which has been technically

revised. It also incorporates the Technical Corrigendum ISO 17201-1:2005/Cor 1:2009.

The main changes compared to the previous edition are as follows:
— the complete document has been editorially revised;

— 5.1, especially Figure 3 and the attached formula have been technically revised;

— Annex A (informative) "Small arms glossary" has been revised editorially;
— Annex B (informative) has been technically revised;
— references have been updated.
A list of all parts in the ISO 17201 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved
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ISO 17201-1:2018(E)
Introduction

The initiative to prepare a standard on impulse noise from shooting ranges was taken by AFEMS, the

Association of European Manufacturers of Sporting Ammunition, in April 1996 by the submission of

a formal proposal to CEN. After consultation in CEN in 1998, CEN/TC 211, Acoustics asked ISO/TC 43/

SC 1, Noise to prepare the ISO 17201 series.

To obtain reliable data for the prediction of shooting sound levels at a reception point, the energy of

sound emission produced by the muzzle blast is needed. The muzzle blast is produced by the propellant

gas expelled from the barrel of a weapon; in most cases the gas has a supersonic fluid speed. Close to the

muzzle, the sound pressure is very high and cannot be described with linear acoustics. For the purpose

of this document, the non-linear region is defined by the observation of a peak sound pressure level

of 154 dB or more. This document defines how the sound source energy and directivity of the muzzle

blast can be obtained from the measurement of sound exposure levels and how these measurements

are to be carried out. The source energy, its directivity and spectral structure can be used as input for

sound propagation models for environmental noise assessment. This cannot be used for calculations of

sound exposure levels close to the weapon, for instance to estimate injury to people or animals.

© ISO 2018 – All rights reserved v
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SIST EN ISO 17201-1:2019
INTERNATIONAL STANDARD ISO 17201-1:2018(E)
Acoustics — Noise from shooting ranges —
Part 1:
Determination of muzzle blast by measurement
1 Scope

This document specifies a method to determine the acoustic source energy of the muzzle blast for

calibres of less than 20 mm or explosive charges of less than 50 g TNT equivalent. It is applicable at

distances where peak pressures less than 1 kPa (equivalent to a peak sound pressure level of 154 dB)

are observed. The source energy, directivity of the source and their spectral structure determined by

this procedure can be used as input data to sound propagation programmes, enabling the prediction of

shooting noise in the neighbourhood of shooting ranges. Additionally, the data can be used to compare

sound emission from different types of guns or different types of ammunition used with the same gun.

This document is applicable to guns used in civil shooting ranges but it can also be applied to military

guns. It is not applicable to the assessment of hearing damage or sound levels in the non-linear region.

Suppressors and silencers are not taken into consideration in this document.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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.

IEC 60942, Electroacoustics — Sound calibrators
IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications

ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in

me a s ur ement (GUM: 1995)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
sound pressure
difference between instantaneous total pressure and static pressure
Note 1 to entry: The sound pressure is expressed in pascals (Pa).

Note 2 to entry: Static pressure is the pressure that exists in the absence of sound waves.

Note 3 to entry: This definition applies to a medium allowing a non-zero mean flow in the atmosphere.

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ISO 17201-1:2018(E)

Note 4 to entry: This definition is technically in accordance with ISO 80000-8:— , item 8-2.2.

Note 5 to entry: For the definition of "static pressure" see ISO 80000-8:—, item 8-2.1, with the difference of

allowing non-zero mean flow.
3.2
sound pressure level

ten times the logarithm to the base 10 of the ratio of the square of the root-mean-squared sound

pressure, p , to the square of a reference value, p
rms 0
rms
L =10lg dB (1)
Note 1 to entry: The sound pressure level is expressed in decibels (dB).
Note 2 to entry: The sound pressure is expressed in pascals (Pa).

Note 3 to entry: For sound in air and other gases, the reference sound pressure is given by p = 20 μPa.

Note 4 to entry: The sound pressure level can be frequency weighted and time weighted.

Note 5 to entry: This definition is technically in accordance with ISO 80000-8:—, item 8-15.

[SOURCE: ISO/TR 25417:2007, 2.2, modified — “the sound pressure, p” has been replaced with “the root-

mean-squared sound pressure, p ”; the wording “where the reference value, p , is 20 μPa” has been

rms 0

removed; the original NOTE 1 and 2 have been removed; Note 1, 2, 3, 4 and 5 to entry have been added.]

3.3
peak sound pressure
peak
maximum absolute sound pressure (3.1) during a stated time interval
Note 1 to entry: The peak sound pressure is expressed in pascals (Pa).

[SOURCE: ISO/TR 25417:2007, 2.4, modified — The word “greatest” has been replaced with “maximum”;

the word “certain” has been replaced with “stated”; NOTE 2 has been removed.]
3.4
peak sound pressure level
p,peak

ten times the logarithm to the base of 10 of the ratio of the square of the peak sound pressure, p (3.3)

peak
to the square of the reference value, p
peak
L =10lg dB (2)
p,peak
Note 1 to entry: The reference value is given by p = 20 μPa.
Note 2 to entry: The peak sound pressure level is expressed in decibels (dB).

Note 3 to entry: Peak sound pressure should be determined with a detector as defined in IEC 61672-1; IEC 61672-

2 only specifies the accuracy of a detector using C-weighting.

[SOURCE: ISO/TR 25417:2007, 2.5, modified — The wording “where the reference value, p , is 20 μPa”

has been removed; the original NOTE has been removed; Note 1, 2 and 3 to entry have been added.]

1) Under preparation.
2 © ISO 2018 – All rights reserved
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3.5
event duration

stated time interval, long enough to encompass all significant sound of a stated event

Note 1 to entry: The event duration is expressed in seconds (s).
3.6
sound exposure

integral of the square of the sound pressure, p (3.1), over a stated time interval or event duration, T (3.5),

starting at t and ending at t
1 2
Ep= ()ttd (3)

Note 1 to entry: The sound exposure is expressed in pascal-squared seconds (Pa s).

[SOURCE: ISO/TR 25417:2007, 2.6, modified — The original NOTE 1 to 4 have been removed; Note 1 to

entry has been added.]
3.7
sound exposure level
E,T

ten times the logarithm to the base 10 of the ratio of the sound exposure, E (3.6), to a reference value, E

T 0
L =10lg dB (4)
ET,
Note 1 to entry: The sound exposure level is expressed in decibels (dB).

Note 2 to entry: For sound in air and other gases, the reference value is given by E = 400 μPa s.

Note 3 to entry: This definition is technically in accordance with ISO 80000-8:—, item 8-17.

[SOURCE: ISO/TR 25417:2007, 2.7, modified — The original NOTE 1 to 3 have been removed; Note 1, 2

and 3 to entry have been added.]
3.8
source energy
total sound source energy of the event
Note 1 to entry: The source energy is expressed in joules (J).
3.9
source energy level

ten times the logarithm to the base 10 of the ratio of source energy, Q (3.8), to the reference source

energy, Q
 
L =10lg dB (5)
 
 
Note 1 to entry: The source energy level is expressed in decibels (dB).
−12
Note 2 to entry: The reference value is given by Q = 10 J.
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3.10
angular source energy distribution
S (α)

acoustic energy radiated from the muzzle blast into the far field, per unit solid angle

Note 1 to entry: The acoustic energy radiated by the muzzle blast within a narrow cone centred on the direction

α (3.14) is:
S α = (6)
where
Q is the sound energy (3.8);
Ω is the solid angle expressed in steradians.

Note 2 to entry: The angular source energy distribution, S (α), is expressed in joules per steradians (J sr ).

Note 3 to entry: Rotational symmetry is assumed around the line with α = 0.
3.11
interpolated angular source energy distribution
S α

continuous function in α of the source energy distribution S α (3.10) derived by using a defined

interpolation method

Note 1 to entry: The interpolated angular source energy distribution, S α , is expressed in joules per steradian

(J sr ).
3.12
angular source energy distribution level
L (α)

angular source energy distribution (3.10), given by ten times the logarithm to base 10 of the ratio of

angular source energy distribution, S α (3.10) to the reference value, S
q q
 
S α
 
L α =10lg dB (7)
 
 0 

Note 1 to entry: The angular source energy distribution level, L (α), is expressed in decibels (dB).

−12 −1
Note 2 to entry: The reference value is given by S = 10 J sr .
3.13
interpolated angular source energy distribution level
L α

continuous function in α of the angular source energy distribution level, L (α) (3.12), derived by using a

defined interpolation method

Note 1 to entry: The interpolated angular source energy distribution level is expressed in decibels (dB).

3.14
angle alpha
angle between the line of fire and the line from the muzzle to the receiver
Note 1 to entry: The angle alpha is expressed in radians in all formulae.
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3.15
angle beta

angle describing the rotation around the line of fire, anticlockwise from the view of the shooter

Note 1 to entry: The angle beta is expressed in radians in all formulae.
3.16
angle gamma
angle describing the inclination of the line of fire from the horizontal plane
Note 1 to entry: The angle gamma is expressed in radians in all formulae.
Note 2 to entry: See Figure 3.
3.17
angle delta
angle constituted by the projection of angle α on the horizontal plane
Note 1 to entry: The angle delta is expressed in radians in all formulae.
Note 2 to entry: See Figure 3.
3.18
directivity
D(α)

difference between the angular source energy distribution level (3.12) of the source under test and the

source energy distribution level of a monopole source with the same acoustic source energy

Note 1 to entry: The directivity is expressed in decibels (dB).
3.19
muzzle distance
distance measured from the muzzle to the microphone point
Note 1 to entry: The muzzle distance is expressed in metres (m).
Note 2 to entry: See Figure 3.
4 Gun and ammunition
4.1 General

The information given in 4.2 to 4.6 is needed to unambiguously define the weapon plus ammunition

combination for which the sound exposure level of the muzzle blast is estimated. All terms have the

meanings given in Reference [14] and Annex A.
4.2 Gun
The following features shall be stated:
— description or brand name;
— type of gun (shot gun, rifle, revolver, pistol, etc.);
— calibre or gauge;
— barrel bore;
© ISO 2018 – All rights reserved 5
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ISO 17201-1:2018(E)
— barrel length.
The following feature should be stated:

— number, type and disposition of barrels (side-to-side, superposed, drilling, etc.).

If present, special features such as the following shall be mentioned:
— flame shield;
— muzzle brake.
Special features such as the following sh
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