Acoustics - Noise emitted by machinery and equipment - Engineering method for the determination of emission sound pressure levels in situ at the work station and at other specified positions using sound intensity (ISO 11205:2003)

This International Standard specifies an engineering method (grade 2 accuracy) to determine the emission sound pressure level of machines in situ, at the work station or at other specified positions, using sound intensity. It is an alternative to ISO 11201, ISO 11202 and ISO 11204 for in situ measurements. It is applicable to all kinds of test environments provided that the requirements on background noise and field indicators are fulfilled. This International Standard is applicable to equipment emitting stationary broadband noise. The noise can differ between operational cycles and can be with or without discrete frequency or narrow band components.

Akustik - Geräuschabstrahlung von Maschinen und Geräten - Verfahren der Genauigkeitsklasse 2 zur Bestimmung von Emissions-Schalldruckpegeln am Arbeitsplatz und an anderen festgelegten Orten unter Einsatzbedingungen aus Schallintensitätsmessungen (ISO 11205:2003)

Diese Internationale Norm legt ein Verfahren der Genauigkeitsklasse 2 fest, um aus Schallintensitäts-messungen den Emissions-Schalldruckpegel von Maschinen am Arbeitsplatz oder an anderen festgelegten Orten unter Einsatzbedingungen zu bestimmen. Sie stellt als Alternative zu ISO 11201, ISO 11202 und ISO 11204 eine Möglichkeit zur Messung unter Einsatzbedingungen dar. Sie ist für alle Arten von Prüf-umgebungen anwendbar, vorausgesetzt, die Anforderungen an das Fremdgeräusch und die Feldindikatoren sind erfüllt.
Diese Internationale Norm gilt für Geräte, die stationäres breitbandiges Geräusch abstrahlen. Das Geräusch kann innerhalb von Arbeitszyklen variieren und kann tonale oder schmalbandige Anteile enthalten.

Acoustique - Bruits émis par les machines et les équipements - Méthode d'expertise pour la détermination par intensimétrie des niveaux de pression acoustique d'émission in situ au poste de travail et en d'autres positions spécifiées (ISO 11205:2003)

L'ISO 11205:2003 spécifie une méthode d'expertise (précision de Classe 2) pour la détermination par intensimétrie du niveau de pression acoustique d'émission in situ, au poste de travail ou en d'autres positions spécifiées. Elle peut se substituer aux normes ISO 11201, ISO 11202 et ISO 11204 relatives aux mesurages in situ. Elle est applicable à tous les types d'environnements d'essai pour autant que les exigences liées au bruit de fond et aux indicateurs de champ soient respectées.
L'ISO 11205:2003 s'applique aux équipements émettant des bruits stables à large bande. Le bruit peut varier entre les cycles de fonctionnement et peut ou non comprendre des composantes à fréquence discrète ou en bande étroite.

Akustika - Emisija hrupa naprav in opreme - Inženirska metoda za ugotavljanje emisijske ravni zvočnega tlaka na mestu delovanja in na drugih opredeljenih mestih z merjenjem jakosti zvoka (ISO 11205:2003)

General Information

Status
Published
Public Enquiry End Date
19-Jun-2009
Publication Date
12-Oct-2009
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-Aug-2009
Due Date
02-Nov-2009
Completion Date
13-Oct-2009

Relations

Buy Standard

Standard
SIST EN ISO 11205:2009
English language
27 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 11205:2009
01-november-2009
1DGRPHãþD
SIST EN ISO 11205:2004
SIST EN ISO 11205:2004/AC:2006
$NXVWLND(PLVLMDKUXSDQDSUDYLQRSUHPH,QåHQLUVNDPHWRGD]DXJRWDYOMDQMH
HPLVLMVNHUDYQL]YRþQHJDWODNDQDPHVWXGHORYDQMDLQQDGUXJLKRSUHGHOMHQLK
PHVWLK]PHUMHQMHPMDNRVWL]YRND ,62

Acoustics - Noise emitted by machinery and equipment - Engineering method for the

determination of emission sound pressure levels in situ at the work station and at other

specified positions using sound intensity (ISO 11205:2003)
Akustik - Geräuschabstrahlung von Maschinen und Geräten - Verfahren der

Genauigkeitsklasse 2 zur Bestimmung von Emissions-Schalldruckpegeln am Arbeitsplatz

und an anderen festgelegten Orten unter Einsatzbedingungen aus
Schallintensitätsmessungen (ISO 11205:2003)

Acoustique - Bruits émis par les machines et les équipements - Méthode d'expertise

pour la détermination par intensimétrie des niveaux de pression acoustique d'émission in

situ au poste de travail et en d'autres positions spécifiées (ISO 11205:2003)
Ta slovenski standard je istoveten z: EN ISO 11205:2009
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
SIST EN ISO 11205:2009 en

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

---------------------- Page: 1 ----------------------
SIST EN ISO 11205:2009
---------------------- Page: 2 ----------------------
SIST EN ISO 11205:2009
EUROPEAN STANDARD
EN ISO 11205
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2009
ICS 17.140.01 Supersedes EN ISO 11205:2003
English Version
Acoustics - Noise emitted by machinery and equipment -
Engineering method for the determination of emission sound
pressure levels in situ at the work station and at other specified
positions using sound intensity (ISO 11205:2003)

Acoustique - Bruits émis par les machines et les Akustik - Geräuschabstrahlung von Maschinen und

équipements - Méthode d'expertise pour la détermination Geräten - Verfahren der Genauigkeitsklasse 2 zur

par intensimétrie des niveaux de pression acoustique Bestimmung von Emissions-Schalldruckpegeln am

d'émission in situ au poste de travail et en d'autres Arbeitsplatz und an anderen festgelegten Orten unter

positions spécifiées (ISO 11205:2003) Einsatzbedingungen aus Schallintensitätsmessungen (ISO

11205:2003)
This European Standard was approved by CEN on 27 July 2009.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the

official versions.

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

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11205:2009: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 11205:2009
EN ISO 11205:2009 (E)
Contents Page

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

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 98/37/EC ..............................................................................................4

Annex ZB (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 2006/42/EC ..........................................................................................5

---------------------- Page: 4 ----------------------
SIST EN ISO 11205:2009
EN ISO 11205:2009 (E)
Foreword

The text of ISO 11205:2003 has been prepared by Technical Committee ISO/TC 43 “Acoustics” of the

International Organization for Standardization (ISO) and has been taken over as EN ISO 11205:2009 by

Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DS.

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

text or by endorsement, at the latest by February 2010, and conflicting national standards shall be withdrawn

at the latest by February 2010.

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 11205:2003.

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 Directives.

For relationship with EU Directives, see informative Annexes ZA and ZB, which are integral parts 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 11205:2003 has been approved by CEN as a EN ISO 11205:2009 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 11205:2009
EN ISO 11205:2009 (E)
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC

This European Standard has been prepared under a mandate given to CEN by the European Commission

and the European Free Trade Association to provide a means of conforming to Essential Requirements of the

New Approach Directive 98/37/EC, amended by 98/79/EC on machinery.

Once this standard is cited in the Official Journal of the European Union 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 confers, within the limits of the scope of this standard, a presumption of conformity with the

relevant Essential Requirements of that Directive and associated EFTA regulations.

WARNING - Other requirements and other EU Directives may be applicable to the product(s) falling within the

scope of this standard.
---------------------- Page: 6 ----------------------
SIST EN ISO 11205:2009
EN ISO 11205:2009 (E)
Annex ZB
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC

This European Standard has been prepared under a mandate given to CEN by the European Commission

and the European Free Trade Association to provide a means of conforming to Essential Requirements of the

New Approach Directive 2006/42/EC on machinery.

Once this standard is cited in the Official Journal of the European Union 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 confers, within the limits of the scope of this standard, a presumption of conformity with the

relevant Essential Requirements of that Directive and associated EFTA regulations.

WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within

the scope of this standard.
---------------------- Page: 7 ----------------------
SIST EN ISO 11205:2009
---------------------- Page: 8 ----------------------
SIST EN ISO 11205:2009
INTERNATIONAL ISO
STANDARD 11205
First edition
2003-11-15
Acoustics — Noise emitted by machinery
and equipment — Engineering method
for the determination of emission sound
pressure levels in situ at the work station
and at other specified positions using
sound intensity
Acoustique — Bruits émis par les machines et les équipements —
Méthode d'expertise pour la détermination par intensimétrie des
niveaux de pression acoustique d'émission in situ au poste de travail et
en d'autres positions spécifiées
Reference number
ISO 11205:2003(E)
ISO 2003
---------------------- Page: 9 ----------------------
SIST EN ISO 11205:2009
ISO 11205:2003(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

© ISO 2003

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2003 — All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 11205:2009
ISO 11205:2003(E)
Contents Page

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

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

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

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

4 Measurement uncertainty..................................................................................................................... 3

5 Principle ................................................................................................................................................. 4

6 Instrumentation ..................................................................................................................................... 4

6.1 General................................................................................................................................................... 4

6.2 Calibration.............................................................................................................................................. 4

7 Installation and operation of the source............................................................................................. 5

7.1 General................................................................................................................................................... 5

7.2 Location of the machine....................................................................................................................... 5

7.3 Mounting of the machine...................................................................................................................... 5

7.4 Auxiliary equipment.............................................................................................................................. 6

7.5 Operation of the machine under test .................................................................................................. 6

8 Test procedure ...................................................................................................................................... 7

8.1 Applicability........................................................................................................................................... 7

8.2 Measurement time interval................................................................................................................... 7

8.3 Measurements ....................................................................................................................................... 8

8.4 Wind and gas flows............................................................................................................................... 9

8.5 Criteria for qualification of the measurement .................................................................................... 9

8.6 Criterion for background noise ........................................................................................................... 9

8.7 Frequency range of measurements .................................................................................................... 9

8.8 Evaluation of the measurement result................................................................................................ 9

9 Information to be recorded ................................................................................................................ 10

9.1 General................................................................................................................................................. 10

9.2 Machine under test ............................................................................................................................. 10

9.3 Test conditions.................................................................................................................................... 10

9.4 Acoustic environment ........................................................................................................................ 10

9.5 Instrumentation ................................................................................................................................... 10

9.6 Location of specified positions ......................................................................................................... 11

9.7 Noise data ............................................................................................................................................ 11

10 Information to be reported ................................................................................................................. 11

Annex A (normative) Criterion for the adequacy of the direction of the sound intensity vector............. 12

Annex B (normative) Procedure for frequencies higher than 5 000 Hz ...................................................... 14

Annex C (normative) Procedure in case the measurement fails to qualify................................................ 15

Annex D (informative) Example of a test table .............................................................................................. 16

Bibliography ..................................................................................................................................................... 17

© ISO 2003 — All rights reserved iii
---------------------- Page: 11 ----------------------
SIST EN ISO 11205:2009
ISO 11205:2003(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 11205 was prepared by Technical Committee ISO/TC 43, Accoustics, Subcommittee SC 1, Noise.

iv © ISO 2003 — All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 11205:2009
INTERNATIONAL STANDARD ISO 11205:2003(E)
Acoustics — Noise emitted by machinery and equipment —
Engineering method for the determination of emission sound
pressure levels in situ at the work station and at other specified
positions using sound intensity
1 Scope

This International Standard specifies an engineering method (grade 2 accuracy) to determine the emission

sound pressure level of machines in situ, at the work station or at other specified positions, using sound

intensity. It is an alternative to ISO 11201, ISO 11202 and ISO 11204 for in situ measurements. It is applicable

to all kinds of test environments provided that the requirements on background noise and field indicators are

fulfilled.

This International Standard is applicable to equipment emitting stationary broadband noise. The noise can

differ between operational cycles and can be with or without discrete frequency or narrow band components.

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 7574-1, Acoustics — Statistical methods for determining and verifying stated noise emission values of

machinery and equipment — Part 1: General considerations and definitions

ISO 12001, Acoustics — Noise emitted by machinery and equipment — Rules for the drafting and

presentation of a noise test code
IEC 60942:2003, Electroacoustics — Sound calibrators

IEC 61043:2003, Electroacoustics — Instruments for the measurement of sound intensity — Measurements

with pairs of pressure sensing microphones
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
sound intensity

time-averaged instantaneous flow of sound energy per unit of area and per unit time in the direction of the

local instantaneous acoustic particle velocity in a temporally stationary sound field

1 G
I = lim pt( )u(t) dt
T →∞ T
© ISO 2003 — All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 11205:2009
ISO 11205:2003(E)
where
p(t) is the instantaneous sound pressure at a point, in pascals;

ut() is the associated instantaneous particle velocity at the same point, in metres per second;

T is the integration period, in seconds;

NOTE The sound intensity is a vectorial quantity. It is expressed in watts per square metre.

3.2
sound intensity vector
xyz
vector sum of three measured orthogonal intensity components
NOTE It is expressed in watts per square metre.
3.3
level of the sound intensity vector
Ixyz

ten times the logarithm to the base 10 of the ratio of the modulus of the sound intensity vector to the reference

intensity I , in decibels, as given by
xyz
L = 10 lg dB
Ixyz
0
−12 2
NOTE The reference sound intensity is I = 10 W/m .
3.4
sound field pressure-intensity indicator or field indicator
pIxyz

difference, in decibels, between the time-averaged measured sound pressure level, L' , and the level of the

sound intensity vector, L , given by
Ixyz
F = L' – L
pIxyz p Ixyz

NOTE 1 When the indicator is determined for each of the Cartesian coordinates x, y and z, it is denoted F , F and

pIx pIy
F respectively.
pIz
NOTE 2 In ISO 9614-1 the notation F is used.
3.5
pressure-residual intensity index
pI0

difference, in decibels, between the indicated sound pressure level and the sound intensity level when the

intensity probe is placed and oriented in a sound field such that the sound intensity is zero

EXAMPLE This can be achieved in an acoustic coupler, or other suitable unit that has been designed for the probe

so that the microphones are transverse to the direction of propagation of plane sound waves.

3.6
emission sound pressure level

sound pressure level at a specified position near a machine, when the machine is in operation under specified

operating and mounting conditions on a reflecting plane surface, excluding the effects of background noise as

well as the effect of reflections other than those from the plane or planes permitted for the purpose of the test

NOTE It is expressed in decibels.
2 © ISO 2003 — All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 11205:2009
ISO 11205:2003(E)
3.7
specified position

position defined in relation to a machine, including, but not limited to, an operator’s position

NOTE The position can be a single, fixed point, or a combination of points along a path or on a surface located at a

specified distance from the machine, as described in the relevant test code, if any. Positions located in the vicinity of a

work station, or in the vicinity of an unattended machine, may be identified as “bystander positions”.

3.8
dynamic capability index

difference, in decibels, between the pressure-residual intensity index and the bias error factor, K

L=−δ K
d0pI
NOTE The value of K is 10 dB in this International Standard.
3.9
hemi-free field intensity correction

correction to account for the fact that the sound intensity level is slightly smaller than the sound pressure level

in a hemi-free field
NOTE 1 In this International Standard, K = 1 dB.

NOTE 2 By introducing this correction, the risk of a small systematic underestimate of the emission sound pressure

level is minimized, see references [9] to [16] in the Bibliography. K is frequency independent and thus also valid for

A-weighted sound pressure levels with the notation K .
4 Measurement uncertainty

A single value of an emission sound pressure level of a noise source determined according to the procedures

of this International Standard is likely to differ from the true value at a fixed position by an amount within the

range of the measurement uncertainty. The uncertainty in measurements of emission sound pressure levels

arises from several factors which affect the results, some associated with environmental conditions in the

measurement room and others with experimental techniques. A method for the determination of the

measurement uncertainty from information on the various influence parameters is specified in the GUM.

Until more specific knowledge is available, the estimation of the measurement uncertainty might be based on

existing information on the standard deviations of reproducibility and repeatibility according to ISO 7574-1.

Extensive measurement data are necessary in order to establish standard deviations of reproducibility and

repeatability of emission sound pressure levels at individual positions; in any case, these standard deviations

are likely to vary considerably between the many types of different machinery and equipment to which this

International Standard is applied. It is therefore not possible to provide information that is universally

applicable, and reference can only be made to noise test codes for relevant data on individual types of

machines.

A typical value for the standard deviation of reproducibility is given in Table 1. From this, and with additional

information on the standard deviation of repeatibility, the total standard deviation and an estimate of the

expanded measurement uncertainty for a coverage probability of approximately 95 % corresponding to a

coverage factor of two, may be derived, as indicated.
© ISO 2003 — All rights reserved 3
---------------------- Page: 15 ----------------------
SIST EN ISO 11205:2009
ISO 11205:2003(E)

Table 1 — Measurement uncertainty of the A-weighted emission sound pressure level

a b
Total standard deviation Expanded
Reproducibility Repeatability standard
standard deviation, σ , deviation, σ , for an uncertainty
RA rA
for a stable source unstable source
dB dB dB dB
22 22
1,5 σσ+ 2σσ+
RrAA RrAA

Found by different operators using different equipment measuring the same machine in different environments. This value includes

a small repeatability standard deviation (σ ≈ 0,5 dB).

Found by the same operator measuring the same machine in the same environment using the same equipment (only to be used

if σ > 0,5 dB).

If frequencies above 5 000 Hz dominate the A-weighted level, σ may be greater, see Annex B.

95 % confidence under the assumption of a Gaussian distribution.

NOTE The value of the measurement uncertainty has been taken from References [11], [12], [15], [16] and [17] in the

Bibliography.
5 Principle

The basic principle of the test method is that the sound intensity in a diffuse sound field is small (theoretically it

should be zero) and that the sound pressure level equals the sound intensity level in a free progressive wave.

The test method assumes that sound which has been reflected will add up to a diffuse sound field. The direct

sound from the machine under test will not be part of the diffuse sound field but constitute the free progressive

wave.

These assumptions will not be fulfilled if sound intensities from different parts of the machine with similar

magnitude will meet at the probe and, to some extent, cancel each other. In such cases, the sound intensity

will become smaller and, assuming uncorrelated summation, the sound pressure will become greater. In such

cases, the level of the sound intensity vector will underestimate the emission sound pressure level. By adding

K to deal with the underestimate of the floor reflection and, for large machines, by requiring that the sound

field pressure-intensity indicator meets the criterion specified in 8.5 the underestimate will be negligible.

6 Instrumentation
6.1 General
−12 2

The intensity-measuring instrumentation shall be able to measure intensity levels re 10 W/m in decibels in

octave or one-third-octave bands. The instrument, including the probe, shall comply with a Class 1 instrument

in accordance with IEC 61043:2003. If the probe does not have a flat frequency response above 5 000 Hz,

see Annex B.

The residual pressure-intensity index δ of the microphone probe and analyser shall be higher than

pI0
F + 10 dB in each octave or one-third-octave band.
6.2 Calibration

The compliance of the instrumentation system with the requirements of IEC 61043 shall be verified

periodically in a manner that is traceable to appropriate standards.

During each series of measurements, the instrument and the probe shall be calibrated at least at one

frequency in the range from 200 Hz to 1 000 Hz in accordance with the calibration procedure.

4 © ISO 2003 — All rights reserved
---------------------- Page: 16 ----------------------
SIST EN ISO 11205:2009
ISO 11205:2003(E)

The following field checks to test the instrument shall be made before each series of measurements.

a) Carry out a field check according to the instrument manufacturer's specifications.

If no field check is specified by the instrument manufacturer, check the instrumentation according to b)

and c):

b) Sound pressure level: Check each pressure microphone of the intensity probe for sound pressure level

using a Class 1 calibrator in accordance with IEC 60942:2003.

c) Intensity: Calibrate using an intensity calibrator. If such a calibrator is not available or if the probe

construction does not allow it, make a check as follows. Place the intensity probe, oriented towards the

most important source of sound emission, at a position where the noise from the machine is characteristic

for that machine. The intensity probe should be mounted on a stand to retain the same position while

carrying out the measurement check. Measure the intensity. Reverse the direction of the intensity probe

180° in the same position as the first measurement and measure the intensity
...

Questions, Comments and Discussion

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