SIST EN IEC 60942:2018

SLOVENSKI STANDARD
SIST EN IEC 60942:2018
01-maj-2018
1DGRPHãþD
SIST EN 60942:2004
Elektroakustika - Kalibratorji za zvokomere (IEC 60942:2017)
Electroacoustics - Sound calibrators (IEC 60942:2017)
Ta slovenski standard je istoveten z: EN IEC 60942:2018
ICS:
17.140.50 Elektroakustika Electroacoustics
SIST EN IEC 60942:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60942:2018

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SIST EN IEC 60942:2018


EUROPEAN STANDARD EN IEC 60942

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2018
ICS 17.140.50; 33.100.20 Supersedes EN 60942:2003
English Version
Electroacoustics - Sound calibrators
(IEC 60942:2017)
Électroacoustique - Calibreurs acoustiques Elektroakustik - Schallkalibratoren
(IEC 60942:2017) (IEC 60942:2017)
This European Standard was approved by CENELEC on 2018-01-03. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60942:2018 E

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SIST EN IEC 60942:2018
EN IEC 60942:2018 (E)

European foreword
The text of document 29/962/FDIS, future edition 4 of IEC 60942, prepared by IEC/TC 29
"Electroacoustics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 60942:2018.

The following dates are fixed:
• latest date by which the document has to be (dop) 2018-10-03
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2021-01-03
• latest date by which the national
standards conflicting with the
document have to be withdrawn

This document supersedes EN 60942:2003.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60942:2017 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60942:2003 NOTE Harmonized as EN 60942:2003 (not modified).
IEC 61094-2:2009 NOTE Harmonized as EN 61094-2:2009 (not modified).

2

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SIST EN IEC 60942:2018
EN IEC 60942:2018 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.

NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.

NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 60050-801 1994 International Electrotechnical Vocabulary - -
(IEV) -- Chapter 801: Acoustics and
electroacoustics
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) -- Part EN 61000-4-2 2009
4-2: Testing and measurement techniques
- Electrostatic discharge immunity test
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) -- Part EN 61000-4-3 2006
4-3: Testing and measurement techniques
- Radiated, radio-frequency,
electromagnetic field immunity test
IEC 61000-4-20 2010 Electromagnetic compatibility (EMC) -- Part EN 61000-4-20 2010
4-20: Testing and measurement
techniques - Emission and immunity
testing in transverse electromagnetic
(TEM) waveguides
IEC 61000-6-1 2005 Electromagnetic compatibility (EMC) -- Part EN 61000-6-1 2007
6-1: Generic standards - Immunity for
residential, commercial and light-industrial
environments
IEC 61000-6-2 2005 Electromagnetic compatibility (EMC) -- Part EN 61000-6-2 2005
6-2: Generic standards - Immunity for
industrial environments
- -  + corrigendum Sep. 2005
IEC 61000-6-3 2006 Electromagnetic compatibility (EMC) -- Part EN 61000-6-3 2007
6-3: Generic standards - Emission
standard for residential, commercial and
light-industrial environments
+ A1 2010  + A1 2011
- -  + AC 2012
IEC 61094-1 2000 Measurement microphones -- Part 1: EN 61094-1 2000
Specifications for laboratory standard
microphones
IEC 61094-4 1995 Measurement microphones -- Part 4: EN 61094-4 1995
Specifications for working standard
microphones
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SIST EN IEC 60942:2018
EN IEC 60942:2018 (E)
IEC 61094-5 -  Measurement microphones - Part 5: EN 61094-5 -
Methods for pressure calibration of working
standard microphones by comparison
IEC 61672-1 -  Electroacoustics - Sound level meters -- EN 61672-1 -
Part 1: Specifications
CISPR 16-1-1 -  Specification for radio disturbance and EN 55016-1-1 -
immunity measuring apparatus and
methods -- Part 1-1: Radio disturbance and
immunity measuring apparatus -
Measuring apparatus
CISPR 16-2-3 2016 Specification for radio disturbance and EN 55016-2-3 2017
immunity measuring apparatus and
methods - Part 2-3: Methods of
measurement of disturbances and
immunity - Radiated disturbance
measurements
CISPR 22 2008 Information technology equipment - Radio EN 55022 2010
disturbance characteristics - Limits and
methods of measurement
ISO/IEC Guide 98-3 2008 Uncertainty of measurement - Part 3: - -
Guide to the expression of uncertainty in
measurement (GUM:1995)
ISO 266 1997 Acoustics - Preferred frequencies EN ISO 266 1997
ISO/IEC Guide 99 -  International vocabulary of metrology - - -
Basic and general concepts and
associated terms (VIM)


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SIST EN IEC 60942:2018



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



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 60942:2018
– 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

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IEC 60942:2017 © IEC 2017 – 3 –
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 Frequency . 45
B.4.8 Total distortion + noise . 45
B.5 Calibration of the sound calibrator with other models of microphone . 46
B.6 Documentation . 46
Annex C (normative) Pattern evaluation report . 48
C.1 General . 48
C.2 Marking . 48
C.3 Submission for test . 48
C.4 Pattern evaluation report content . 48
Annex D (informative) Relationship between tolerance interval, corresponding
acceptance interval and the maximum-permitted uncertainty of measurement . 50
Annex E (informative) Example assessments of conformance to specifications of this
document . 51
E.1 General . 51
E.2 Conformance criteria . 51
E.3 Example test results . 51
Bibliography . 54

Figure D.1 – Relationship between tolerance interval, corresponding acceptance
interval and the maximum-permitted uncertainty of measurement . 50
Figure E.1 – Examples of assessment of conformance . 53

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SIST EN IEC 60942:2018
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Table 1 – Sound calibrator classes and designations . 13
Table 2 – Acceptance limits for sound pressure level and short-term level fluctuation,
at and around reference environmental conditions . 16
Table 3 – Acceptance limits for the effect of supply voltage on sound pressure level,
under reference environmental conditions . 16
Table 4 – Acceptance limits for frequency, at and around reference environmental
conditions . 17
Table 5 – Acceptance limits for sound pressure level, over the specified range of
environmental conditions . 18
Table 6 – Acceptance limits for frequency, over the specified range of environmental
conditions . 18
Table 7 – Maximum total distortion + noise . 19
Table A.1 – Maximum-permitted uncertainty of measurement for a coverage probability
of 95 %, for sound pressure level and short-term level fluctuation at and around
reference environmental conditions . 28
Table A.2 – Maximum-permitted uncertainty of measurement for a coverage probability
of 95 % for frequency, at and around reference environmental conditions . 29
Table A.3 – Maximum-permitted uncertainty of measurement for a coverage probability
of 95 % for total distortion + noise, over the appropriate range of environmental
conditions . 30
Table A.4 – Maximum-permitted uncertainty of measurement for a coverage probability
of 95 %, for sound pressure level, over the specified range of environmental conditions . 32
Table A.5 – Maximum-permitted uncertainty of measurement for a coverage probability
of 95 % for frequency, over the specified range of environmental conditions . 35
Table E.1 – Examples of assessment of conformance . 52

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SIST EN IEC 60942:2018
IEC 60942:2017 © IEC 2017 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTROACOUSTICS – SOUND CALIBRATORS

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,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60942 has been prepared by IEC technical committee 29:
Electroacoustics, in cooperation with the International Organization of Legal Metrology
(OIML).
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;

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SIST EN IEC 60942:2018
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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.
The text of this International Standard is based on the following documents:
FDIS Report on voting
29/962/FDIS 29/969/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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SIST EN IEC 60942:2018
IEC 60942:2017 © IEC 2017 – 7 –
INTRODUCTION
Sound calibrators are designed to produce one or more known sound pressure levels at one
or more specified frequencies when coupled to specified models of microphone in specified
configurations, for example, with or without protective grid. The sound pressure level
generated by some sound calibrators depends on the static pressure.
Sound calibrators have two principal applications:
a) the determination of the electroacoustical pressure sensitivity of specified models of
microphone in specified configurations;
b) checking or adjusting the overall sensitivity of acoustical measuring devices or systems.

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ELECTROACOUSTICS – SOUND CALIBRATORS



1 Scope
This document 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.
To promote consistency of testing of sound calibrators and ease of use, this document
contains three normative annexes – Annex A "Pattern evaluation tests", Annex B "Periodic
tests", Annex C "Pattern evaluation report", and two informative Annexes – Annex D
"Relationship between tolerance interval, corresponding acceptance interval and the
maximum-permitted uncertainty of measurement" and Annex E "Example assessments of
conformance to specifications of this document".
This document does not include requirements for equivalent free-field or random-incidence
sound pressure levels, such as can be used in the overall sensitivity adjustment of a sound
level meter.
A sound calibrator can provide other funct
...