SIST EN ISO 3095:2013

Acoustics - Railway applications - Measurement of noise emitted by railbound vehicles (ISO 3095:2013)

This International Standard specifies measurement methods and conditions to obtain reproducible and comparable exterior noise emission levels and spectra for all kinds of vehicles operating on rails or other types of fixed track, hereinafter conventionally called ?unit?. This International Standard is applicable to type testing of units. It does not include all the instructions to characterize the noise emission of the other infrastructure related sources (bridges, crossings, switching, impact noise, curving noise, etc.).

Bahnanwendungen - Akustik - Messung der Geräuschemission von spurgebundenen Fahrzeugen (ISO 3095:2013)

Diese Europäische Norm legt die Messverfahren und -bedingungen fest, um reproduzierbare und vergleichbare Außengeräuschpegel und -spektren für alle Arten spurgebundener Fahrzeuge zu gewinnen, die auf Schienen oder anderen Arten fest verlegter Gleise verkehren, hier nachfolgend üblicherweise „Einheit“ genannt.
Diese Norm ist anwendbar für die Typprüfung von Einheiten. Sie umfasst nicht all jene Vorschriften mit denen die Geräuschemission der anderen infrastrukturbezogenen Quellen (Brücken, Bahnübergänge, Weichen, Stoßgeräusche, Kurvengeräusche usw.) bestimmt werden.
Diese Norm ist nicht anwendbar auf
-   die Geräuschemission von arbeitenden Gleisbaumaschinen,
-   die Beurteilung der Umweltbelastung,
-   die Beurteilung der Geräuscheinwirkung,
-   das Geräusch der Warnsignale.
Die Ergebnisse können z. B. benutzt werden,
-   um das von Zügen abgestrahlte Außengeräusch zu charakterisieren,
-   um die Geräuschemission von verschiedenen Einheiten auf einem bestimmten Gleisabschnitt zu vergleichen,
-   um grundlegende Quelldaten für Züge zu erheben.
Die für die Typprüfung in dieser Norm festgelegten Verfahren haben die Genauigkeitsklasse 2 (mit Fehler-grenzen von  2 dB), das ist die für die Zwecke der Geräuschangabe bevorzugte Genauigkeitsklasse, wie in EN ISO 12001 bestimmt. Wenn die Prüfbedingungen (z. B. Fahrzeug- und/oder Gleiszustand, Mess-bedingungen) gelockert werden, z. B. um gewöhnliche Züge am Gleis zu überwachen, haben die Ergebnisse folglich nicht mehr die Genauigkeitsklasse 2.
Die für Beschleunigungs- und Bremsprüfungen festgelegten Verfahren haben die Genauigkeitsklasse 3 (siehe EN ISO 12001).

Acoustique - Applications ferroviaires - Mesurage du bruit émis par les véhicules circulant sur rails (ISO 3095:2013)

L'ISO 3095:2013 spécifie la méthode et les conditions de mesurage pour obtenir des niveaux et spectres d'émission de bruit extérieur reproductibles et comparables pour tous les types de véhicules ferroviaires circulant sur des rails ou d'autres types de voie fixe, ci-après appelés par convention «élément».
L'ISO 3095:2013 est applicable à l'essai de type des éléments. Elle n'inclut pas toutes les instructions qui visent à caractériser l'émission de bruit des autres sources liées à l'infrastructure (les ponts, les passages à niveau, les aiguillages, le bruit d'impact, le bruit en courbe, etc.).
L'ISO 3095:2013 n'est pas applicable:
- au bruit à l'émission des éléments de maintenance des voies lors de leurs phases de travail,
- à l'évaluation de l'impact sur l'environnement,
- à l'évaluation de la gêne due au bruit,
- aux bus guidés,
- aux bruits de signaux d'avertissement.
Les résultats peuvent être utilisés, par exemple:
- pour caractériser le bruit extérieur émis par les unités,
- pour comparer l'émission de bruit de divers éléments sur une section de voie particulière,
- pour recueillir des données de source de base pour les trains.

Akustika - Železniške naprave - Merjenje hrupa, ki ga oddajajo tirna vozila (ISO 3095:2013)

Ta mednarodni standard določa merilne metode in pogoje za pridobivanje ponovljivih in primerljivih ravni in spektrov zunanjega hrupa, ki ga oddajajo različna tirna vozila (v nadaljevanju »enota«). Ta mednarodni standard se uporablja za tipsko preskušanje enot. Standard ne vključuje vseh navodil za označevanje hrupa, ki ga oddajajo drugi viri infrastrukture (mostovi, prehodi, stikalna oprema, udarni zvok, zvok pri zavijanju itd.).

General Information

• Status: Published
• Public Enquiry End Date: 31-Jul-2010
• Publication Date: 11-Sep-2013
• ICS: 17.140.30 - Noise emitted by means of transport
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: IŽNP - Reilway applications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-Sep-2013
• Due Date: 09-Nov-2013
• Completion Date: 12-Sep-2013
• Directive: 2008/57/EC - Directive 2008/57/EC of the European Parliament and of the Council of 17 June 2008 on the interoperability of the rail system within the Community (Recast)
• Directive: 96/48/EC - Interoperability of the trans-European high-speed rail system
• Mandate: M/334 - Mandate for programming and standardisation addressed to CEN, CENELEC and ETSI in the field of the Interoperability of the trans-european conventional rail system
• Ref Project: EN ISO 3095:2013 - Acoustics - Railway applications - Measurement of noise emitted by railbound vehicles (ISO 3095:2013)

Relations

• Replaces: SIST EN ISO 3095:2005 - Railway applications - Acoustics - Measurement of noise emitted by railbound vehicles (ISO 3095:2005)
• Effective Date: 14-Aug-2013

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 3095:2013
01-oktober-2013
1DGRPHãþD
SIST EN ISO 3095:2005
Akustika - Železniške naprave - Merjenje hrupa, ki ga oddajajo tirna vozila (ISO
3095:2013)

Acoustics - Railway applications - Measurement of noise emitted by railbound vehicles

(ISO 3095:2013)
Bahnanwendungen - Akustik - Messung der Geräuschemission von spurgebundenen
Fahrzeugen (ISO 3095:2013)

Acoustique - Applications ferroviaires - Mesurage du bruit émis par les véhicules

circulant sur rails (ISO 3095:2013)
Ta slovenski standard je istoveten z: EN ISO 3095:2013
ICS:
17.140.30 Emisija hrupa transportnih Noise emitted by means of
sredstev transport
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
SIST EN ISO 3095:2013 en,fr

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

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SIST EN ISO 3095:2013
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SIST EN ISO 3095:2013
EUROPEAN STANDARD
EN ISO 3095
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2013
ICS 17.140.30; 45.020 Supersedes EN ISO 3095:2005
English Version
Acoustics - Railway applications - Measurement of noise emitted
by railbound vehicles (ISO 3095:2013)

Acoustique - Applications ferroviaires - Mesurage du bruit Bahnanwendungen - Akustik - Messung der

émis par les véhicules circulant sur rails (ISO 3095:2013) Geräuschemission von spurgebundenen Fahrzeugen (ISO

3095:2013)
This European Standard was approved by CEN on 1 May 2013.

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, 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: Avenue Marnix 17, B-1000 Brussels

© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3095:2013: E

worldwide for CEN national Members.
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SIST EN ISO 3095:2013
EN ISO 3095:2013 (E)
Contents Page

Foreword ..............................................................................................................................................................3

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SIST EN ISO 3095:2013
EN ISO 3095:2013 (E)
Foreword

This document (EN ISO 3095:2013) has been prepared by Technical Committee CEN/TC 256 “Railway

applications”, the secretariat of which is held by DIN, in collaboration with Technical Committee ISO/TC 43

"Acoustics".

This European Standard shall be given the status of a national standard, either by publication of an identical

text or by endorsement, at the latest by February 2014, and conflicting national standards shall be withdrawn

at the latest by February 2014.

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 3095:2005.

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 EU Directive.

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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Endorsement notice

The text of ISO 3095:2013 has been approved by CEN as EN ISO 3095:2013 without any modification.

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SIST EN ISO 3095:2013
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SIST EN ISO 3095:2013
INTERNATIONAL ISO
STANDARD 3095
Third edition
2013-08-01
Acoustics — Railway applications
— Measurement of noise emitted by
railbound vehicles
Acoustique — Applications ferroviaires — Mesurage du bruit émis
par les véhicules circulant sur rails
Reference number
ISO 3095:2013(E)
ISO 2013
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SIST EN ISO 3095:2013
ISO 3095:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

All rights reserved. Unless otherwise specified, 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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
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SIST EN ISO 3095:2013
ISO 3095:2013(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Instrumentation and calibration ......................................................................................................................................................... 5

4.1 Instrumentation ..................................................................................................................................................................................... 5

4.2 Calibration .................................................................................................................................................................................................. 5

5 Stationary test ......................................................................................................................................................................................................... 5

5.1 General ........................................................................................................................................................................................................... 5

5.2 Environmental conditions ............................................................................................................................................................. 5

5.3 Track conditions .................................................................................................................................................................................... 6

5.4 Vehicle conditions ................................................................................................................................................................................ 6

5.5 Measurement positions ................................................................................................................................................................... 7

5.6 Measured quantities ........................................................................................................................................................................... 8

5.7 Test procedure ......................................................................................................................................................................................... 8

5.8 Data processing ...................................................................................................................................................................................... 9

6 Constant speed test .........................................................................................................................................................................................10

6.1 Environmental conditions ..........................................................................................................................................................10

6.2 Track conditions .................................................................................................................................................................................11

6.3 Vehicle conditions .............................................................................................................................................................................13

6.4 Measurement positions ................................................................................................................................................................16

6.5 Measured quantities ........................................................................................................................................................................17

6.6 Test procedure ......................................................................................................................................................................................17

6.7 Data processing ...................................................................................................................................................................................20

7 Acceleration test from standstill .......................................................................................................................................................21

7.1 General ........................................................................................................................................................................................................21

7.2 Environmental conditions ..........................................................................................................................................................21

7.3 Track conditions .................................................................................................................................................................................22

7.4 Vehicle conditions .............................................................................................................................................................................22

7.5 Maximum level method ................................................................................................................................................................23

7.6 Averaged level method ..................................................................................................................................................................25

8 Braking test .............................................................................................................................................................................................................26

8.1 Environmental conditions ..........................................................................................................................................................26

8.2 Track conditions .................................................................................................................................................................................27

8.3 Vehicle conditions .............................................................................................................................................................................27

8.4 Measurement positions ................................................................................................................................................................27

8.5 Measurement quantity ..................................................................................................................................................................28

8.6 Test procedure ......................................................................................................................................................................................28

8.7 Data processing ...................................................................................................................................................................................28

9 Quality of the measurements ...............................................................................................................................................................29

9.1 Deviations from the requirements ......................................................................................................................................29

9.2 Measurement tolerances .............................................................................................................................................................29

9.3 Measurement spread ......................................................................................................................................................................29

9.4 Measurement uncertainties ......................................................................................................................................................29

10 Test report ................................................................................................................................................................................................................29

Annex A (normative) Method to characterize the impulsive character of the noise .......................................31

Annex B (normative) Tests at constant speed — Special cases ..............................................................................................32

Annex C (normative) Method to assess acceptable small deviations from acoustic rail

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SIST EN ISO 3095:2013
ISO 3095:2013(E)

roughness requirements ...........................................................................................................................................................................37

Annex D (informative) Guidance for light rail vehicles measurement ...........................................................................39

Annex E (informative) Comparability of test situations in terms of acoustic rail roughness .................43

Annex F (informative) Additional measurements ...............................................................................................................................46

Annex G (informative) Quantification of measurement uncertainties according to ISO/

[8]

IEC Guide 98-3:2008 ................................................................................................................................................................................47

Bibliography .............................................................................................................................................................................................................................52

iv © ISO 2013 – All rights reserved
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SIST EN ISO 3095:2013
ISO 3095:2013(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. 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. 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.

The committee responsible for this document is the European Committee for Standardization (CEN) in

collaboration with Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise, in accordance

with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 3095:2005), which has been

technically revised.
© ISO 2013 – All rights reserved v
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SIST EN ISO 3095:2013
ISO 3095:2013(E)
Introduction

Railway exterior noise is encountered both along open track and in and around depots, stops, stations

and other holding locations. It includes a number of different physical sources such as rolling noise,

impact noise, traction noise, aerodynamic noise, curving noise, braking noise, horn noise and noise from

auxiliary equipment and other components. The noise for any given train type strongly depends on the

rolling stock design, operating conditions and the track type and condition.

Rolling noise is one of the main sources which contain a significant and sometimes dominant noise

contribution from the track. This International Standard is intended to characterize the noise emission

from the unit, minimizing the influence of the track.
vi © ISO 2013 – All rights reserved
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SIST EN ISO 3095:2013
INTERNATIONAL STANDARD ISO 3095:2013(E)
Acoustics — Railway applications — Measurement of noise
emitted by railbound vehicles
1 Scope

This International Standard specifies measurement methods and conditions to obtain reproducible and

comparable exterior noise emission levels and spectra for all kinds of vehicles operating on rails or other

types of fixed track, hereinafter conventionally called “unit”.

This International Standard is applicable to type testing of units. It does not include all the instructions

to characterize the noise emission of the other infrastructure related sources (bridges, crossings,

switching, impact noise, curving noise, etc.).
This International Standard is not applicable to:
— the noise emission of track maintenance units while working;
— environmental impact assessment;
— noise immission assessment;
— guided buses;
— warning signal noise.
The results may be used, for example:
— to characterize the exterior noise emitted by units;
— to compare the noise emission of various units on a particular track section;
— to collect basic source data for units.

NOTE 1 The type testing procedures specified in this International Standard are of engineering grade (grade 2),

that is the preferred one for noise declaration purposes, as defined in ISO 12001. If test conditions (e.g. vehicle

and/or track conditions, measuring conditions) are relaxed (e.g. as done for trackside monitoring of in-service

trains), then the results are no longer of engineering grade.

NOTE 2 The procedures specified for accelerating and decelerating tests are of survey grade, see ISO 12001.

NOTE 3 Additional guidance is provided in Annex D for measurements in the specific case of light rail vehicles.

2 Normative references

The following referenced documents, in whole or in part, are normatively referenced in this document

and are indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

IEC 60942:2003, Electroacoustics — Sound calibrators

IEC 61260:1995, Electroacoustics — Octave-band and fractional-octave-band filters

IEC 61260:1995/Amd. 1:2001, Electroacoustics — Octave-band and fractional-octave-band filters —

Amendment 1
IEC 61672-1:2002, Electroacoustics — Sound level meters — Part 1: Specifications

IEC 61672-2:2003, Electroacoustics — Sound level meters — Part 2: Pattern evaluation tests

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SIST EN ISO 3095:2013
ISO 3095:2013(E)

EN 15461:2011, Railway applications — Noise emission — Characterization of the dynamic properties of

track sections for pass by noise measurements (includes Amdendment 1:2010)

EN 15610:2009, Railway applications — Noise emission — Rail roughness measurement related to rolling

noise generation

ISO/IEC 17025:2005, General requirements for the competence of testing and calibration laboratories

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
train

single vehicle or a number of coupled vehicles/units operating on a guided ground transport system

Note 1 to entry: See Table 1.
Table 1 — Definitions of rolling stock formations
Articulated Non-articulated
Vehicle - see unit. Vehicle - any single car on its running gear.

Unit - minimum operational formation of articulated Unit - minimum operational formation comprising of

cars. one or more vehicles coupled together.

Train - refers to any formation which may operate in Train - refers to any formation which may operate

service, it may comprise of one or more units coupled in-service, may be either a single unit or one or more

together. units coupled together.
[SOURCE: EN 13452-1:2003]
3.2
car
single non-articulated element of a railbound vehicle or unit
3.3
type test for noise emission of railbound units

one or more tests performed to prove that a product is capable of conforming to all relevant requirements

of a specification

[SOURCE: ISO 12576-1:2001, 3.27, modified — for noise emission of railbound units has been added.]

3.4
environmental impact assessment test

measurement performed for collecting data to be used in a prediction method for environmental assessment

3.5
acoustic rail roughness
r(x)

variation of the height of the rail running surface associated with rolling noise excitation, expressed as

a function of distance x along the rail
Note 1 to entry: Acoustic rail roughness is expressed in µm.
[SOURCE: EN 15610:2009]
2 © ISO 2013 – All rights reserved
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SIST EN ISO 3095:2013
ISO 3095:2013(E)
3.6
acoustic roughness spectrum
r()λ
amplitude of the acoustic roughness expressed as a function of the wavelength λ

Note 1 to entry: Acoustic roughness spectrum is expressed in μm and usually presented in terms of acoustic

roughness level L in dB re 1 μm.
[SOURCE: EN 15610:2009]
3.7
track decay rate

rate of attenuation of vibration amplitude of either vertical or lateral bending wave motion in the rail as

a function of the distance along the rail

Note 1 to entry: It is represented by a one-third octave spectrum of values expressed in decibels per metre (dB/m)

representing attenuation over distance.
[SOURCE: EN 15461:2011 and Amd. 1:2010]
3.8
test section
specific section of track associated with a particular set of measurements
[SOURCE: EN 15610:2009]
3.9
reference track section

portion of track on which the track decay rates and the acoustic roughness levels are controlled

3.10
sound pressure
difference between instantaneous total pressure and static pressure
Note 1 to entry: The quantity refers also to the rms value.
[SOURCE: ISO 80000-8:2007]
3.11
sound pressure level
 
L =10 lg dB
 
 0 

where p is the sound pressure and the reference value in airborne acoustics is p = 20 μPa.

Note 1 to entry: Because of practical limitations of the measuring instruments, p is always understood to denote

the square of a frequency-weighted, frequency-band-limited or time weighted sound pressure or both. If specific

frequency and time weightings, as specified in IEC 61672-1:2002, or specific frequency bands or both are applied,

this should be indicated by appropriate subscripts.

[SOURCE: ISO 80000-8:2007, modified — year added to IEC 61672-1 in Note 1 to entry]

3.12
AF-weighted sound pressure level history
L (t)
pAF

A-weighted sound pressure level as a function of time with time weighting F (fast)

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SIST EN ISO 3095:2013
ISO 3095:2013(E)
3.13
AF-weighted maximum sound pressure level
pAFmax

maximum value of the A-weighted sound pressure level determined during the measurement time

interval T by using time weighting F (fast)
[SOURCE: IEC 61672-1:2002]
3.14
A-weighted equivalent continuous sound pressure level
pAeq,T
A-weighted sound pressure level given by the following Formula:
 2 
1 p(t)
 
L =10lg dt dB
p,Aeq T
∫ 2
 T 
 
where
L is the A-weighted equivalent continuous sound pressure level in dB;
pAeq,T
T is the measurement time interval in s;
p (t) is the A-weighted instantaneous sound pressure at running time t in Pa;
p is the reference sound pressure; p = 20 μPa.
0 0
Note 1 to entry: Adapted from ISO 1996-1:2003.
3.15
impulsive sound

noise characterized by one or more brief bursts of sound pressure and is such that the duration of a

single impulsive noise is usually less than 1 s
Note 1 to entry: Adapted from ISO 1996-1:2003.
Note 2 to entry: This definition does not apply to a whole pass-by event.

Note 3 to entry: Examples of impulsive noise sources: Blowoff valves, relay switches.

3.16
intermittent sound

noise that occurs at regular or irregular time intervals and is such that the duration of each such

occurrence is more than about 5 s
Note 1 to entry: Adapted from ISO 1996-1:2003.
Note 2 to entry: This definition does not apply to a whole pass-by event.

Note 3 to entry: Intermittence should be assessed relatively to the duration of the event.

Note 4 to entry: Examples: compressor, cooling fans.
3.17
tonal sound

sound characterized by a single frequency component or narrow-band components that emerge audibly

from the total sound
[SOURCE: ISO 1996-1:2003]
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SIST EN ISO 3095:2013
ISO 3095:2013(E)
4 Instrumentation and calibration
4.1 Instrumentation

Each component of the instrumentation system shall meet the requirements for a class 1 instrument

specified in IEC 61672-1:2002.

In the case of measurements of survey grade this requirement is relaxed to class 2 instruments.

The sound calibrator shall meet the requirements of class 1 according to IEC 60942:2003.

Microphones with free field characteristics shall be used. A suitable microphone windscreen shall

always be used.

Where one-third octave frequency band analysis is required, the filters shall meet the requirements of

class 1, according to IEC 61260:1995.

The compliance of the calibrator with the requirements of IEC 60942:2003 shall be verified at least

once a year. The compliance of the instrumentation system with the requirements of IEC 61672-1:2002

and IEC 61672-2:2003 shall be verified at least every 2 years. The date of the last verification of the

compliance with the relevant standards shall be recorded.
4.2 Calibration

Before and after each series of measurements, a sound calibrator shall be applied to the microphone(s) for

verifying the calibration of the entire measuring system at
...