IEC 61672-2:2013

Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests

IEC 61672-2:2013 provides details of the tests necessary to verify conformance to all mandatory specifications given in IEC 61672-1 for time-weighting sound level meters, integrating-averaging sound level meters, and integrating sound level meters. Pattern-evaluation tests apply for each channel of a multi-channel sound level meter, as necessary. Tests and test methods are applicable to class 1 and class 2 sound level meters. The aim is to ensure that all laboratories use consistent methods to perform pattern-evaluation tests. This second edition cancels and replaces the first edition published in 2003. This second edition constitutes a technical revision, the main technical changes with regard to the previous edition concern conformance to specifications which is now demonstrated when measured deviations from design goals do not exceed the applicable acceptance limits, and when the uncertainty of measurement does not exceed the corresponding maximum permitted uncertainty, with both uncertainties determined for a coverage probability of 95 %. In this document, references to IEC 61672-1, IEC 61672-2, and IEC 61672-3 refer to the second editions unless stated otherwise. Procedures for the pattern-evaluation testing of sound level meters designed to conform to the specifications of IEC 61672-1:2002 were given in IEC 61672-2:2003.

Electroacoustique - Sonomètres - Partie 2: Essais d'évaluation d'un modèle

La CEI 61672-2:2013 donne des détails concernant les essais nécessaires pour vérifier la conformité à toutes les spécifications obligatoires données dans la CEI 61672-1 pour les sonomètres à pondération temporelle, les sonomètres intégrateurs-moyenneurs, et les sonomètres intégrateurs. Les essais d'évaluation d'un modèle s'appliquent, si nécessaire, à chaque canal d'un sonomètre à plusieurs canaux. Les essais et les méthodes d'essai sont applicables aux sonomètres de classe 1 et de classe 2. Le but est de s'assurer que tous les laboratoires utilisent des méthodes cohérentes pour effectuer les essais d'évaluation d'un modèle. Cette seconde édition annule et remplace la première édition parue en 2003. Elle constitue une révision technique qui inclut des modifications techniques majeures concernant démonstration de la conformité aux spécifications. Elle est maintenant démontrée lorsque les écarts mesurés par rapport aux valeurs nominales ne dépassent pas les limites d'acceptation applicables, et lorsque l'incertitude de mesure ne dépasse pas l'incertitude maximale autorisée correspondante, les deux incertitudes étant déterminées pour une probabilité de couverture de 95 %. Dans ce document, les références aux CEI 61672-1, CEI 61672-2, et CEI 61672-3 s'entendent pour les deuxièmes éditions, sauf indication contraire. Les procédures pour réaliser les essais d'évaluation d'un modèle de sonomètres conçus pour être conformes aux spécifications de la CEI 61672-1:2002 ont été données dans la CEI 61672-2:2003.

General Information

• Status: Published
• Publication Date: 29-Sep-2013
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.140.50 - Electroacoustics
• Technical Committee: TC 29 - Electroacoustics
• Drafting Committee: MT 4 - TC 29/MT 4
• Current Stage: PPUB - Publication issued
• Start Date: 30-Sep-2013
• Completion Date: 30-Sep-2013

Relations

• Amended By: IEC 61672-2:2013/AMD1:2017 - Amendment 1 - Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests
• Effective Date: 05-Sep-2023
• Revises: IEC 61672-2:2003 - Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61672-2 ®
Edition 2.0 2013-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Sound level meters –
Part 2: Pattern evaluation tests

Electroacoustique – Sonomètres –
Partie 2: Essais d'évaluation d'un modèle

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 IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
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IEC 61672-2 ®
Edition 2.0 2013-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Sound level meters –

Part 2: Pattern evaluation tests

Electroacoustique – Sonomètres –

Partie 2: Essais d'évaluation d'un modèle

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX W
ICS 17.140.50 ISBN 978-2-8322-1080-2

– 2 – 61672-2 © IEC:2013
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Submission for testing . 7
5 Marking of the sound level meter and information in the Instruction Manual . 8
6 Mandatory facilities and general requirements . 8
7 Environmental, electrostatic, and radio-frequency tests . 10
7.1 General . 10
7.2 Uncertainties for measurements of environmental test conditions . 11
7.3 Influence of static pressure . 11
7.4 Limits on air temperature, relative humidity and static pressure . 12
7.5 Acclimatization requirements for tests of the influence of air temperature and
relative humidity . 12
7.6 Abbreviated test of the combined influence of air temperature and relative
humidity . 12
7.7 Influence of air temperature . 14
7.8 Influence of relative humidity . 15
7.9 Influence of electrostatic discharges . 16
7.10 Influence of a.c. power-frequency and radio-frequency fields. 17
7.10.1 Sound signal . 17
7.10.2 AC power-frequency tests . 17
7.10.3 Radio-frequency tests . 17
8 Radio-frequency emissions and public power supply disturbances. 19
9 Electroacoustical performance tests . 20
9.1 General . 20
9.2 Indication at the calibration check frequency . 21
9.3 Directional response . 21
9.4 Tests of frequency weightings with acoustical signals . 23
9.4.1 General . 23
9.4.2 Windscreen corrections . 24
9.4.3 Free-field tests . 24
9.4.4 Comparison coupler tests . 25
9.4.5 Conformance . 26
9.4.6 Random incidence . 26
9.5 Tests of frequency weightings with electrical signals . 27
9.5.1 General . 27
9.5.2 First alternative test procedure (variable input signal level). 27
9.5.3 Second alternative test procedure (constant input signal level) . 27
9.5.4 Conformance . 28
9.5.5 Frequency weightings C or Z at 1 kHz . 28
9.6 Corrections for the effect of reflections from the case of a sound level meter
and diffraction around a microphone . 28
9.7 Corrections to obtain free-field or random-incidence sound levels . 29
9.8 Level linearity . 30
9.8.1 Tests at an air temperature near the reference air temperature . 30
9.8.2 Tests at elevated air temperature . 31

61672-2 © IEC:2013 – 3 –
9.9 Under-range indication . 31
9.10 Self-generated noise level . 31
9.11 Decay time constants for time weightings F and S . 32
9.12 Toneburst response for sound level meters that measure time-weighted
sound level . 32
9.13 Toneburst response for sound level meters that measure sound exposure
level or time-averaged sound level . 33
9.14 Response to sequences of repeated tonebursts for sound level meters that
measure time-averaged sound level . 34
9.15 Overload indication . 34
9.16 C-weighted peak sound level . 35
9.17 Reset . 36
9.18 Electrical output . 36
9.19 Timing facilities . 36
9.20 Crosstalk in multi-channel sound level meter systems . 36
9.21 Power supply . 36
10 Pattern evaluation report . 37
Bibliography . 38

– 4 – 61672-2 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
SOUND LEVEL METERS –
Part 2: Pattern evaluation tests

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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misinterpretation by any end user.
4) In order to promote inter
...

IEC 61672-2 ®
Edition 2.1 2017-04
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Sound level meters –
Part 2: Pattern evaluation tests

Electroacoustique – Sonomètres –
Partie 2: Essais d'évaluation d'un modèle

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 IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

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3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
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A propos de l'IEC
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Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

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Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC 61672-2 ®
Edition 2.1 2017-04
COONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Sound level meters –

Part 2: Pattern evaluation tests

Electroacoustique – Sonomètres –

Partie 2: Essais d'évaluation d'un modèle

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-4211-7

IEC 61672-2 ®
Edition 2.1 2017-04
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Electroacoustics – Sound level meters –
Part 2: Pattern evaluation tests

Electroacoustique – Sonomètres –
Partie 2: Essais d'évaluation d'un modèle

– 2 – IEC 61672-2:2013+AMD1:2017 CSV
© IEC 2017
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Submission for testing . 7
5 Marking of the sound level meter and information in the Instruction Manual . 8
6 Mandatory facilities and general requirements . 8
7 Environmental, electrostatic, and radio-frequency tests . 10
7.1 General . 10
7.2 Uncertainties for measurements of environmental test conditions . 11
7.3 Influence of static pressure . 11
7.4 Limits on air temperature, relative humidity and static pressure . 12
7.5 Acclimatization requirements for tests of the influence of air temperature and
relative humidity . 12
7.6 Abbreviated test of the combined influence of air temperature and relative
humidity . 12
7.7 Influence of air temperature . 14
7.8 Influence of relative humidity . 15
7.9 Influence of electrostatic discharges . 16
7.10 Influence of a.c. power-frequency and radio-frequency fields. 17
7.10.1 Sound signal . 17
7.10.2 AC power-frequency tests . 17
7.10.3 Radio-frequency tests . 17
8 Radio-frequency emissions and public power supply disturbances. 19
9 Electroacoustical performance tests . 20
9.1 General . 20
9.2 Indication at the calibration check frequency . 21
9.3 Directional response . 22
9.4 Tests of frequency weightings with acoustical signals . 23
9.4.1 General . 23
9.4.2 Windscreen corrections . 24
9.4.3 Free-field tests . 24
9.4.4 Comparison coupler tests . 25
9.4.5 Conformance . 26
9.4.6 Random incidence . 26
9.5 Tests of frequency weightings with electrical signals . 27
9.5.1 General . 27
9.5.2 First alternative test procedure (variable input signal level). 27
9.5.3 Second alternative test procedure (constant input signal level) . 28
9.5.4 Conformance . 28
9.5.5 Frequency weightings C or Z at 1 kHz . 28
9.6 Corrections for the effect of reflections from the case of a sound level meter
and diffraction around a microphone . 28
9.7 Corrections to obtain free-field or random-incidence sound levels . 29
9.8 Level linearity . 30
9.8.1 Tests at an air temperature near the reference air temperature . 30

© IEC 2017
9.8.2 Tests at elevated air temperature . 31
9.9 Under-range indication . 31
9.10 Self-generated noise level . 31
9.11 Decay time constants for time weightings F and S . 32
9.12 Toneburst response for sound level meters that measure time-weighted
sound level . 32
9.13 Toneburst response for sound level meters that measure sound exposure
level or time-averaged sound level . 33
9.14 Response to sequences of repeated tonebursts for sound level meters that
measure time-averaged sound level . 34
9.15 Overload indication . 35
9.16 C-weighted peak sound level . 35
9.17 Reset . 36
9.18 Electrical output . 36
9.19 Timing facilities . 36
9.20 Crosstalk in multi-channel sound level meter systems . 36
9.21 Power supply . 36
10 Pattern evaluation report . 37
Bibliography . 38

– 4 – IEC 61672-2:2013+AMD1:2017 CSV
© IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
SOUND LEVEL METERS –
Part 2: Pattern evaluation tests
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldw
...