prEN IEC 61094-9:2025

SLOVENSKI STANDARD
01-junij-2025
Elektroakustika - Merilni mikrofoni - 9. del: Specifikacije za prenos standardnih
mikrofonov
Electroacoustics - Measurement microphones - Part 9: Specifications for transfer
standard microphones
Ta slovenski standard je istoveten z: prEN IEC 61094-9:2025
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.

29/1198/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61094-9 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-04-11 2025-07-04
SUPERSEDES DOCUMENTS:
29/1175/NP, 29/1178/RVN
IEC TC 29 : ELECTROACOUSTICS
SECRETARIAT: SECRETARY:
Denmark Ms Lise Aagesen
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
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clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Electroacoustics - Measurement microphones - Part 9: Specifications for transfer standard
microphones
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
this electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee
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without permission in writing from IEC.

29/1198/CDV - 2 - IEC CDV 61094-9 ED1 © IEC 2025
1 CONTENTS
3 FOREWORD . 3
4 INTRODUCTION . 5
5 1 Scope . 6
6 2 Normative references . 6
7 3 Terms and definitions . 7
8 4 Reference environmental conditions . 7
9 5 Classification of transfer standard microphone . 7
10 5.1 General . 7
11 5.2 Transfer standard type designation . 7
12 6 Characteristics of transfer standard microphones . 8
13 6.1 General . 8
14 6.2 Sensitivity . 8
15 6.3 Effective load volume . 8
16 6.4 Upper limit of the dynamic range . 8
17 6.5 Lower limit of the dynamic range . 9
18 6.6 Static pressure dependence of microphone sensitivity . 9
19 6.7 Temperature dependence of microphone sensitivity . 9
20 6.8 Humidity dependence of microphone sensitivity . 9
21 6.9 Electrical insulation properties . 9
22 6.10 Stability of microphone sensitivity . 10
23 6.11 Pressure-equalizing leakage . 10
24 7 Specifications . 10
25 7.1 Mechanical dimensions . 10
26 7.2 Electroacoustic specifications . 12
27 7.3 Identification markings . 13
29 Figure 1 – Mechanical configuration of microphones . 11
31 Table 1 – Nominal mechanical dimensions and tolerances for transfer standard
32 microphones in Figure 1 . 12
33 Table 2 – Electroacoustic specifications for transfer standard microphones . 13
IEC CDV 61094-9 ED1 © IEC 2025 - 3 - 29/1198/CDV
38 INTERNATIONAL ELECTROTECHNICAL COMMISSION
39 ____________
41 ELECTROACOUSTICS – MEASUREMENT MICROPHONES
43 Part 9: Specifications for transfer standard microphones
47 FOREWORD
48 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
49 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
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70 6) All users should ensure that they have the latest edition of this publication.
71 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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75 Publications.
76 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
77 indispensable for the correct application of this publication.
78 9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
79 patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
80 respect thereof. As of the date of publication of this document, [IEC had not received notice of (a) patent(s),
81 which may be required to implement this document. However, implementers are cautioned that this may not
82 represent the latest information, which may be obtained from the patent database available at
83 https://patents.iec.ch [and/or] www.iso.org/patents. IEC shall not be held responsible for identifying any or all
84 such patent rights.
85 IEC 61094-9 has been prepared by of IEC technical committee 29: Electroacoustics. It is an
86 International Standard.
87 The text of this International Standard is based on the following documents:
Draft Report on voting
XX/XX/FDIS XX/XX/RVD
89 Full information on the voting for its approval can be found in the report on voting indicated in
90 the above table.
29/1198/CDV - 4 - IEC CDV 61094-9 ED1 © IEC 2025
91 The language used for the development of this International Standard is English.
92 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
93 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
94 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
95 described in greater detail at www.iec.ch/publications.
96 The committee has decided that the contents of this document will remain unchanged until the
97 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
98 specific document. At this date, the document will be
99 • reconfirmed,
100 • withdrawn,
101 • replaced by a revised edition, or
102 • amended.
IEC CDV 61094-9 ED1 © IEC 2025 - 5 - 29/1198/CDV
104 INTRODUCTION
105 In establishing specifications for acoustic measuring instrumentation, it has been useful to
106 introduce a designation system for measurement microphones depending on their intended use.
107 Laboratory standard microphones have been specified principally for establishing primary
108 measurement standards and working standard microphones have been specified for
109 generalised use as part of a practical measurement systems.
110 However, in a study of the application of standards for measurement microphones, sound
111 calibrators and sound level meters, it was decided that a further designation would be useful
112 for measurement microphones with an intermediate specification, for microphones capable of
113 producing comparable results when coupled to a given sound calibrator or comparison coupler.
114 This part of IEC 61094 therefore provides specifications for transfer standard microphones
115 intended to meet this purpose. The specification covers the frequency range 10 Hz to 1 250 Hz.
116 This range covers the lower frequency part of the specification of frequency weightings of sound
117 level meters in IEC 61672-1. At higher frequencies, an LS2 microphone can be used for
118 calibration of calibrators and as reference in comparison couplers.
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121 ELECTROACOUSTICS – MEASUREMENT MICROPHONES
123 Part 9: Specifications for transfer standard microphones
126 1 Scope
127 This part of IEC 61094 specifies the geometrical configuration and essential electroacoustic
128 characteristics for condenser microphones used as transfer standards for the dissemination of
129 measurement traceability for sound pressure and for sound pressure measurements of high
130 accuracy.
131 The specifications are intended to optimise reproducibility in pressure sensitivity calibration of
132 measurement microphones by comparison in couplers and when the measurement microphones
133 are coupled to a given sound calibrator or comparison coupler, in the range of nominal
134 frequencies from 10 Hz to 1 250 Hz, when using the transfer standard microphone as a
135 reference device.
136 The specifications do not ensure that a transfer standard microphone can be used above
137 1 250 Hz, because the presence of a grid causes the reproducibility in the intended use to
138 deteriorate. Some specifications for transfer standard microphones at higher frequencies are
139 included because they are necessary for the intended use.
140 This part of IEC 61094 also supplements the mnemonic system established in IEC 61094-1 for
141 classifying measurement microphones, to include transfer standard microphones.
142 2 Normative references
143 The following documents are referred to in the text in such a way that some or all of their content
144 constitutes requirements of this document. For dated references, only the edition cited applies.
145 For und
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