IEC 60942:2017
(Main)Electroacoustics - Sound calibrators
Electroacoustics - Sound calibrators
IEC 60942:2017 specifies the performance requirements for three classes of sound calibrator: class LS (Laboratory Standard), class 1 and class 2. Acceptance limits are smallest for class LS and greatest for class 2 instruments. Class LS sound calibrators are normally used only in the laboratory; class 1 and class 2 are considered as sound calibrators for field use. A class 1 sound calibrator is primarily intended for use with a class 1 sound level meter and a class 2 sound calibrator primarily with a class 2 sound level meter, as specified in IEC 61672-1. The acceptance limits for class LS sound calibrators are based on the use of a laboratory standard microphone, as specified in IEC 61094-1, for demonstrations of conformance to the requirements of this document. The acceptance limits for class 1 and class 2 sound calibrators are based on the use of a working standard microphone, as specified in IEC 61094-4, for demonstrations of conformance to the requirements of this document. This fourth edition cancels and replaces the third edition published in 2003, of which it constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) deletion of the class designations, class LS/C, class 1/C and class 2/C;
b) addition of two further class designations, class LS/M and class 1/M, specifically for pistonphones;
c) addition of an amended criterion for assessing conformance to a specification: conformance is now demonstrated when (a) measured deviations from design goals do not exceed the applicable acceptance limits and (b) the uncertainty of measurement does not exceed the corresponding maximum-permitted uncertainty;
d) modification to the short-term level fluctuation test of the sound pressure level stability;
e) change to some environmental test conditions to avoid icing;
f) addition of an alternative test for immunity to radio-frequency fields using transverse electromagnetic (TEM) waveguides.
Electroacoustique - Calibreurs acoustiques
L'IEC 60942:2017 spécifie les exigences de performance de trois classes de calibreurs acoustiques: la classe LS (Laboratory Standard, étalon de laboratoire), la classe 1 et la classe 2. Les limites d'acceptation les plus faibles concernent la classe LS et les plus élevées concernent les appareils de classe 2. Les calibreurs acoustiques de classe LS ne sont normalement utilisés qu'en laboratoire; les appareils de classe 1 et de classe 2 sont considérés comme des calibreurs acoustiques utilisés sur le terrain. Un calibreur de classe 1 est prévu pour être utilisé principalement avec un sonomètre de classe 1 et un calibreur de classe 2 est prévu pour être utilisé principalement avec un sonomètre de classe 2, tel qu'il est spécifié dans l'IEC 61672-1. Les limites d'acceptation concernant les calibreurs de classe LS pour démontrer la conformité avec les exigences du présent document sont basées sur l'utilisation d'un microphone étalon de laboratoire spécifié dans l'IEC 61094-1. Les limites d'acceptation concernant les calibreurs acoustiques de classe 1 et 2 pour démontrer la conformité avec les exigences du présent document sont basées sur l'utilisation d'un microphone étalon de travail spécifié dans l'IEC 61094-4. Cette quatrième édition annule et remplace la troisième édition parue en 2003, dont elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) suppression des désignations de classe, classe LS/C, classe 1/C et classe 2/C;
b) ajout de deux autres désignations de classes, les classes LS/M et 1/M, spécifiquement destinées aux pistonphones;
c) ajout d'un critère modifié pour évaluer la conformité avec une spécification: désormais, la conformité est démontrée lorsque (a) les écarts mesurés par rapport aux valeurs nominales ne dépassent pas les limites d'acceptation applicables et (b) l'incertitude de mesure ne dépasse pas l'incertitude de mesure maximale admise correspondante;
d) modification de l'essai de fluctuation du niveau à court terme de la stabilité du niveau de pression acoustique;
e) modification de certaines conditions applicables aux essais d'environnement pour éviter la formation de givre;
f) ajout d'une variante d'essai pour l'immunité aux champs aux fréquences radioélectriques, faisant appel aux guides d'ondes électromagnétiques transverses (TEM).
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IEC 60942 ®
Edition 4.0 2017-11
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INTERNATIONAL
STANDARD
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Electroacoustics – Sound calibrators
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IEC 60942 ®
Edition 4.0 2017-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Electroacoustics – Sound calibrators
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.140.50; 33.100.20 ISBN 978-2-8322-5135-5
– 2 – IEC 60942:2017 RLV © IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 10
4 Reference environmental conditions . 12
5 Requirements . 12
5.1 General . 12
5.2 Adaptors . 16
5.3 Sound pressure level . 16
5.3.1 General . 16
5.3.2 Generated sound pressure level . 16
5.3.3 Short-term level fluctuation . 16
5.3.4 Sound pressure level over range of supply voltage . 17
5.4 Frequency . 18
5.4.1 General . 18
5.4.2 Frequency of sound generated by the sound calibrator . 18
5.5 Influence of static pressure, air temperature and humidity . 18
5.6 Total distortion + noise . 20
5.7 Power supply requirements . 21
5.8 Specification and calibration of microphones . 21
5.8.1 Microphone models and adaptors . 21
5.8.2 Microphone sensitivity level . 21
5.9 Electromagnetic compatibility . 22
5.9.1 General . 22
5.9.2 Radio-frequency emissions . 22
5.9.3 Electrostatic discharges . 22
5.9.4 Immunity to power- and radio-frequency fields . 22
6 Instrument marking and documentation . 23
6.1 Marking of the sound calibrator . 23
6.2 Individual calibration chart for a class LS sound calibrator . 24
6.3 Instruction manual . 24
Annex A (normative) Pattern evaluation tests . 26
A.1 Introduction General . 26
A.2 Submission for test . 27
A.3 Principal values . 27
A.4 Marking of the sound calibrator and supplied documentation . 27
A.5 Performance tests at and around reference environmental conditions . 27
A.5.1 General . 27
A.5.2 Orientation . 28
A.5.3 Ambient noise . 28
A.5.4 Microphone specification . 28
A.5.5 Sound pressure level . 28
A.5.6 Sound pressure level stability – Short-term level fluctuation . 30
A.5.7 Frequency . 31
A.5.8 Total distortion + noise . 32
A.6 Environmental tests . 33
A.6.1 General . 33
A.6.2 Influence of static pressure . 34
A.6.3 Acclimatization requirements for tests of the influence of variations in
air temperature and relative humidity . 35
A.6.4 Abbreviated test of influence of air temperature and humidity combined . 35
A.6.5 Influence of air temperature . 38
A.6.6 Influence of relative humidity . 39
A.6.7 Influence of air temperature and humidity combined . 40
A.7 Electromagnetic compatibility . 41
A.7.1 General . 41
A.7.2 Radio-frequency emissions . 42
A.7.3 Electrostatic discharges . 42
A.7.4 Immunity to power- and radio-frequency fields . 43
Annex B (normative) Periodic tests . 45
B.1 Introduction General . 45
B.2 Submission for test . 46
B.3 Preliminary inspection . 46
B.4 Performance tests . 46
B.4.1 Orientation . 46
B.4.2 Ambient noise . 46
B.4.3 Environmental conditions . 46
B.4.4 Additional equipment . 47
B.4.5 Microphone specification . 47
B.4.6 Sound pressure level . 47
B.4.7 Frequency . 49
B.4.8 Total distortion + noise . 49
B.5 Calibration of the sound calibrator with other models of microphone . 50
B.6 Documentation . 50
Annex C (normative) Format for the Pattern evaluation report . 52
C.1 Introduction General . 52
C.2 Marking . 52
C.3 Submission for test . 52
C.4 Pattern evaluation report content . 52
Annex D (informative) Relationship between tolerance interval, corresponding
acceptance interval and the maximum-permitted uncertainty of measurement . 93
Annex E (informative) Example assessments of conformance to specifications of this
document . 94
E.1 General . 94
E.2 Conformance criteria . 94
E.3 Example test results . 94
Bibliography . 97
Figure D.1 – Relationship between tolerance interval, corresponding acceptance
interval and the maximum-permitted uncertainty of measurement . 93
Figure E.1 – Examples of assessment of conformance . 96
– 4 – IEC 60942:2017 RLV © IEC 2017
Table 1 – Sound calibrator classes and designations . 14
Table 2 – Tolerance Acceptance limits for sound pressure level and short-term level
fluctuation, at and around reference environmental conditions . 17
Table 3 – Tolerance Acceptance limits for the effect of supply voltage on sound
pressure level, under reference environmental conditions . 18
Table 4 – Tolerance Acceptan
...
IEC 60942 ®
Edition 4.0 2017-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Sound calibrators
Électroacoustique – Calibreurs acoustiques
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
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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.
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Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 60942 ®
Edition 4.0 2017-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Sound calibrators
Électroacoustique – Calibreurs acoustiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50; 33.100.20 ISBN 978-2-8322-5049-5
– 2 – IEC 60942:2017 © IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 10
4 Reference environmental conditions . 12
5 Requirements . 12
5.1 General . 12
5.2 Adaptors . 14
5.3 Sound pressure level . 15
5.3.1 General . 15
5.3.2 Generated sound pressure level . 15
5.3.3 Short-term level fluctuation . 15
5.3.4 Sound pressure level over range of supply voltage . 16
5.4 Frequency . 16
5.4.1 General . 16
5.4.2 Frequency of sound generated by the sound calibrator . 16
5.5 Influence of static pressure, air temperature and humidity . 17
5.6 Total distortion + noise . 18
5.7 Power supply requirements . 19
5.8 Specification and calibration of microphones . 19
5.8.1 Microphone models and adaptors . 19
5.8.2 Microphone sensitivity level . 19
5.9 Electromagnetic compatibility . 20
5.9.1 General . 20
5.9.2 Radio-frequency emissions . 20
5.9.3 Electrostatic discharges . 20
5.9.4 Immunity to power- and radio-frequency fields . 20
6 Instrument marking and documentation . 21
6.1 Marking of the sound calibrator . 21
6.2 Individual calibration chart for a class LS sound calibrator . 22
6.3 Instruction manual . 22
Annex A (normative) Pattern evaluation tests . 24
A.1 General . 24
A.2 Submission for test . 24
A.3 Principal values . 25
A.4 Marking of the sound calibrator and supplied documentation . 25
A.5 Performance tests at and around reference environmental conditions . 25
A.5.1 General . 25
A.5.2 Orientation . 25
A.5.3 Ambient noise . 25
A.5.4 Microphone specification . 26
A.5.5 Sound pressure level . 26
A.5.6 Sound pressure level stability – Short-term level fluctuation . 27
A.5.7 Frequency . 28
A.5.8 Total distortion + noise . 29
A.6 Environmental tests . 30
A.6.1 General . 30
A.6.2 Influence of static pressure . 30
A.6.3 Acclimatization requirements for tests of the influence of variations in
air temperature and relative humidity . 32
A.6.4 Abbreviated test of influence of air temperature and humidity combined . 32
A.6.5 Influence of air temperature . 35
A.6.6 Influence of relative humidity . 36
A.6.7 Influence of air temperature and humidity combined . 37
A.7 Electromagnetic compatibility . 38
A.7.1 General . 38
A.7.2 Radio-frequency emissions . 38
A.7.3 Electrostatic discharges . 39
A.7.4 Immunity to power- and radio-frequency fields . 40
Annex B (normative) Periodic tests . 42
B.1 General . 42
B.2 Submission for test . 43
B.3 Preliminary inspection . 43
B.4 Performance tests . 43
B.4.1 Orientation . 43
B.4.2 Ambient noise . 43
B.4.3 Environmental conditions . 43
B.4.4 Additional equipment . 43
B.4.5 Microphone specification . 44
B.4.6 Sound pressure level . 44
B.4.7
...
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