SIST EN 61094-2:2009/A1:2022

Electroacoustics - Measurement microphones - Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique (IEC 61094-2:2009/AMD1:2022)

No scope available

Elektroakustik - Messmikrofone - Teil 2: Primärverfahren zur Druckkammer-Kalibrierung von Laboratoriums-Normalmikrofonen nach der Reziprozitätsmethode (IEC 61094-2:2009/AMD1:2022)

Electroacoustique - Microphones de mesure - Partie 2: Méthode primaire pour l'étalonnage en pression des microphones étalons de laboratoire par la méthode de réciprocité (IEC 61094-2:2009/AMD1:2022)

Elektroakustika - Merilni mikrofoni - 2. del: Primarna metoda za kalibriranje tlaka laboratorijskih standardnih mikrofonov z recipročno tehniko - Dopolnilo A1 (IEC 61094-2:2009/AMD1:2022)

General Information

• Status: Published
• Publication Date: 03-Apr-2022
• ICS: 17.140.50 - Electroacoustics
• ICS: 33.160.50 - Accessories
• Technical Committee: I11 - Imaginarni 11
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 25-Mar-2022
• Due Date: 30-May-2022
• Completion Date: 04-Apr-2022
• Ref Project: EN 61094-2:2009/A1:2022 - Electroacoustics - Measurement microphones - Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique

Relations

• Amends: SIST EN 61094-2:2009 - Electroacoutstics - Measurement microphones - Part 2: Primary method for the pressure calibration of laboratory standard microphones by the reciprocity technique (IEC 61094-2:2009)
• Effective Date: 24-Nov-2020

Overview

EN 61094-2:2009/A1:2022 (IEC 61094-2:2009/AMD1:2022) is a CLC/CENELEC amendment to the international standard for electroacoustics that defines the primary method for pressure calibration of laboratory standard microphones by the reciprocity technique. This document updates methods, corrections and uncertainty considerations used in high-accuracy microphone calibration and is intended for use in national and international acoustic metrology.

Key topics and technical requirements

• Reciprocity technique for pressure calibration - the standard formalizes the primary reciprocity method used to derive the pressure sensitivity of laboratory standard microphones.
• Heat-conduction and viscosity corrections - introduces expanded treatments for heat conduction and viscous effects in couplers and cavities, including guidance on applying a complex correction factor (Δ) to coupler volume or cross-sectional area.
• Frequency-domain validity ranges - provides practical ranges where low-frequency and plane-wave solutions are valid (examples in the amendment: plane-wave coupler correction valid roughly 1 000–3 450 Hz; broad-band transfer-admittance validity approximately 175–1 150 Hz for typical couplers).
• Coupler and cavity modelling - updates to acoustic transfer admittance calculations, including use of transmission line theory for medium frequencies and notes on modelling limits at coupler ends.
• Influence of leakage and pressure equalization - new subclause on leakage effects at low frequencies and requirements to calculate effects if controlled leakage (e.g., capillary) is used.
• Acoustic impedance of microphones - expanded guidance on heat conduction and pressure-equalizing tube contributions to microphone acoustic impedance and diaphragm compliance (noting different effects for microphone types).
• Uncertainty components and traceability - revised table entries and references for uncertainty contributors (leakage, static pressure, temperature corrections, polarizing voltage references updated).
• Annexes and reference data - includes Annex A with low-frequency and broad-band solutions, tabulated Δ values (Table A.1) for validation, and updated bibliographic references.

Applications and who uses this standard

• Metrology and calibration laboratories performing primary pressure calibrations of laboratory standard microphones.
• National measurement institutes (NMIs) and accredited calibration bodies seeking traceable microphone sensitivity measurements.
• Microphone and acoustic transducer manufacturers validating reference microphones and compliance.
• Research institutions and consultants in electroacoustics, environmental noise, and sound measurement systems that require high-accuracy microphone calibration procedures.

Related standards and keywords

• Related family: IEC/EN 61094 series (measurement microphones).
• Important keywords for search and discovery: electroacoustics, measurement microphones, reciprocity calibration, pressure calibration, laboratory standard microphones, acoustic impedance, coupler correction, uncertainty, EN 61094-2, IEC 61094-2, CENELEC A1.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2022
Elektroakustika - Merilni mikrofoni - 2. del: Primarna metoda za kalibriranje tlaka
laboratorijskih standardnih mikrofonov z recipročno tehniko - Dopolnilo A1 (IEC
61094-2:2009/AMD1:2022)
Electroacoustics - Measurement microphones - Part 2: Primary method for pressure
calibration of laboratory standard microphones by the reciprocity technique (IEC 61094-
2:2009/AMD1:2022)
Elektroakustik - Messmikrofone - Teil 2: Primärverfahren zur Druckkammer-Kalibrierung
von Laboratoriums-Normalmikrofonen nach der Reziprozitätsmethode (IEC 61094-
2:2009/AMD1:2022)
Electroacoustique - Microphones de mesure - Partie 2: Méthode primaire pour
l'étalonnage en pression des microphones étalons de laboratoire par la méthode de
réciprocité (IEC 61094-2:2009/AMD1:2022)
Ta slovenski standard je istoveten z: EN 61094-2:2009/A1:2022
ICS:
17.140.50 Elektroakustika Electroacoustics
33.160.50 Pribor Accessories
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61094-2:2009/A1

NORME EUROPÉENNE
EUROPÄISCHE NORM March 2022
ICS 17.140.50
English Version
Electroacoustics - Measurement microphones - Part 2: Primary
method for pressure calibration of laboratory standard
microphones by the reciprocity technique
(IEC 61094-2:2009/AMD1:2022)
Electroacoustique - Microphones de mesure - Partie 2: Elektroakustik - Messmikrofone - Teil 2: Primärverfahren
Méthode primaire pour l'étalonnage en pression des zur Druckkammer-Kalibrierung von Laboratoriums-
microphones étalons de laboratoire par la méthode de la Normalmikrofonen nach der Reziprozitätsmethode
réciprocité (IEC 61094-2:2009/AMD1:2022)
(IEC 61094-2:2009/AMD1:2022)
This amendment A1 modifies the European Standard EN 61094-2:2009; it was approved by CENELEC on 2022-03-11. CENELEC
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment 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 amendment 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61094-2:2009/A1:2022 E

European foreword
The text of document 29/1108/FDIS, future IEC 61094-2/AMD1, prepared by IEC/TC 29
"Electroacoustics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022-12-11
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-03-11
document have to be withdrawn
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61094-2:2009/AMD1:2022 was approved by CENELEC as
a European Standard without any modification.

IEC 61094-2 ®
Edition 2.0 2022-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Electroacoustics – Measurement microphones –

Part 2: Primary method for pressure calibration of laboratory standard

microphones by the reciprocity technique

Électroacoustique – Microphones de mesure –

Partie 2: Méthode primaire pour l’étalonnage en pression des microphones

étalons de laboratoire par la méthode de la réciprocité

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-1074-5

– 2 – IEC 61094-2:2009/AMD1:2022
© IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
MEASUREMENT MICROPHONES –
Part 2: Primary method for pressure calibration of laboratory
standard microphones by the reciprocity technique

AMENDMENT 1
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 document may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 61094-2:2009 has been prepared by IEC technical committee 29:
Electroacoustics.
The text of this Amendment is based on the following documents:
Draft Report on voting
29/1108/FDIS 29/1112/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.

IEC 61094-2:2009/AMD1:2022 – 3 –
© IEC 2022
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under 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.
___________
5.5 Heat-conduction correction
Add, after the second existing paragraph, the following new paragraph:
At medium frequencies, transmission line theory, Equation (4), is applied to account for plane
wave propagation in the coupler, but the influence of heat conduction at the ends of the coupler
cannot be modelled accurately as impedances at the end surfaces. However, it can be
demonstrated that, at frequencies
...