EN 61094-3:1995

Measurement microphones - Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique

Applies to laboratory standard microphones meeting the requirements of IEC 61094-1. The principles of the method are applicable to other types of microphones. In particular, microphones which fulfil the requirements of IEC 61094-1, when fitted with a special adaptor, may also be calibrated according to this standard when the adaptor is removed. Specifies a primary method of determining the free-field sensitivity so as to establish a reproducible and accurate basis for the measurement of sound pressure under free-field conditions.[]This publication supersedes IEC 60486.

Meßmikrofone - Teil 3: Primärverfahren zur Freifeld-Kalibrierung von Laboratoriums-Normalmikrofonen nach der Reziprozitätsmethode

Microphones de mesure - Partie 3: Méthode primaire pour l'étalonnage en champ libre des microphones étalons de laboratoire par la méthode de réciprocité

S'applique aux microphones étalons de laboratoire répondant aux prescriptions de la CEI 61094-1. Les principes de la méthode sont applicables à d'autres types de microphones. En particulier, les microphones qui répondent aux prescriptons de la CEI 61094-1, quand ils sont munis d'un adaptateur spécial, peuvent aussi être étalonnés selon cette norme quand l'adapteur est enlevé. Spécifie une méthode primaire de détermination de l'efficacité en champ libre de manière à établir une base reproductible et exacte pour la mesure de la pression acoustique dans des conditions de champ libre.[]Cette norme remplace la CEI 60486.

Measurement microphones - Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique (IEC 61094-3:1995)

General Information

• Status: Withdrawn
• Publication Date: 11-Dec-1995
• Withdrawal Date: 31-Aug-1996
• ICS: 17.140.50 - Electroacoustics
• ICS: 33.160.50 - Accessories
• Technical Committee: CLC/SR 29 - Electroacoustics
• Drafting Committee: IEC/TC 29 - IEC_TC_29
• Parallel Committee: IEC/TC 29 - IEC_TC_29
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 19-Jul-2019
• Completion Date: 19-Jul-2019
• Ref Project: SIST EN 61094-3:2002 - Measurement microphones -- Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique

Relations

• Replaced By: EN 61094-3:2016 - Electroacoustics - Measurement microphones - Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61094-3:2002
01-september-2002
Measurement microphones - Part 3: Primary method for free-field calibration of
laboratory standard microphones by the reciprocity technique (IEC 61094-3:1995)
Measurement microphones -- Part 3: Primary method for free-field calibration of
laboratory standard microphones by the reciprocity technique
Meßmikrofone -- Teil 3: Primärverfahren zur Freifeld-Kalibrierung von Laboratoriums-
Normalmikrofonen nach der Reziprozitätsmethode
Microphones de mesure -- Partie 3: Méthode primaire pour l'étalonnage en champ libre
des microphones étalons de laboratoire par la méthode de réciprocité
Ta slovenski standard je istoveten z: EN 61094-3:1995
ICS:
17.140.50 Elektroakustika Electroacoustics
33.160.50 Pribor Accessories
SIST EN 61094-3:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61094-3:2002

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SIST EN 61094-3:2002

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SIST EN 61094-3:2002

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SIST EN 61094-3:2002

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SIST EN 61094-3:2002

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SIST EN 61094-3:2002
CEI
NORME
IEC
INTERNATIONALE
1094-3
INTERNATIONAL
Première édition
STANDARD
First edition
1995-11
Microphones de mesure
Partie 3:
Méthode primaire pour l'étalonnage en champ libre
des microphones étalons de laboratoire
par la méthode de réciprocité
Measurement microphone
Part 3:
Primary method for free-field calibration
of laboratory standard microphones
by the reciprocity technique
de reproduction réservés — Copyright — all rights reserved
© CEI 1995 Droits
No part of this publication may be reproduced or utilized in
Aucune partie de cette publication ne peut être reproduite ni
any form or by any means, electronic or mechanical,
utilisée sous quelque forme que ce soit et par aucun pro-
including photocopying and microfilm, without permission
cédé, électronique ou mécanique, y compris la photocopie et
in writing from the publisher.
les microfilms, sans l'accord écrit de l'éditeur.
Suisse
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For price, see current catalogue

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SIST EN 61094-3:2002
1094-3 ©IEC:1995 - 3 -
CONTENTS
Page
FOREWORD 5
Clause
1 Scope 7
2 Normative references 7
3 Definitions 7
3.1 Reciprocal microphone 7
3.2 Phase angle of free-field sensitivity of a microphone 9
3.3 Acoustic centre of a microphone 9
3.4 Equivalent point-transducer 9
3.5 Electrical transfer impedance 9
3.6 Acoustical transfer impedance 9
3.7 Principal axis of a microphone 9
3.8 Free-field conditions 9
9
4 Reference environmental conditions
5 Principles of free-field calibration by reciprocity 11
11
5.1 General principle
11
5.2 Basic expressions
13
5.3 Insert voltage technique
13
5.4 Free-field receiving characteristics of a microphone
5.5 Free-field transmitting characteristics of a microphone 15
17
5.6 Reciprocity procedure
17
5.7 Final expressions for the free-field sensitivity
6 Factors influencing the free-field sensitivity 19
6.1 General 19
19
6.2 Polarizing voltage
19
6.3 Ground shield reference configuration
19
6.4 Acoustic conditions
21
6.5 Position of the acoustic centre of a microphone
6.6 Dependence on environmental conditions 21
23
7 Calibration uncertainty components
23
7.1 General
7.2 Electrical transfer impedance 23
23
7.3 Attenuation of sound in air
7.4 Deviations from ideal field conditions 25
25
7.5 Polarizing voltage
25
7.6 Physical quantities
25
7.7 Uncertainty on free-field sensitivity level
Annexes
27
A Values for the position of the acoustic centres of microphones.
Values of the air attenuation coefficients 29
B
33
C Environmental influence on the sensitivity of microphones

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SIST EN 61094-3:2002
1094-3 ©IEC:1995 - 5 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
MEASUREMENT MICROPHONES
Part 3: Primary method for free-field calibration
of laboratory standard microphones
by the reciprocity technique
FOREWORD
1) The IEC (Inte rnational Electrotecnical Commission) is a world-wide organization for standardization comprising all national
electrotechnical Committees (IEC National Committees). The object of the IEC is to promote international cooperation on
all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities,
the IEC publ
...