IEC 61094-5:2016

Electroacoustics - Measurement microphones - Part 5: Methods for pressure calibration of working standard microphones by comparison

IEC 61094-5:2016 is applicable to working standard microphones with removable protection grids meeting the requirements of IEC 61094-4 and to laboratory standard microphones meeting the requirements of IEC 61094-1. This part of IEC 61094 describes methods of determining the pressure sensitivity by comparison with either a laboratory standard microphone or another working standard microphone with known sensitivity in the respective frequency range. This edition cancels and replaces the first edition published in 2001. This edition constitutes a technical revision.

Electroacoustique - Microphones de mesure - Partie 5: Méthodes pour l'étalonnage en pression par comparaison des microphones étalons de travail

L'IEC 61094-5:2016 s'applique aux microphones étalons de travail dotés d'une grille de protection amovible satisfaisant aux exigences de l'IEC 61094-4 et aux microphones étalons de laboratoire satisfaisant aux exigences de l'IEC 61094-1. La présente norme décrit des méthodes de détermination de l'efficacité en pression par comparaison avec un microphone étalon de laboratoire ou un autre microphone étalon de travail dont l'efficacité dans la plage de fréquences concernée est connue. Cette édition annule et remplace la première édition parue en 2001. Cette édition constitue une révision technique.

General Information

• Status: Published
• Publication Date: 29-May-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.140.50 - Electroacoustics
• Technical Committee: TC 29 - Electroacoustics
• Drafting Committee: WG 5 - TC 29/WG 5
• Current Stage: PPUB - Publication issued
• Start Date: 31-Jul-2016
• Completion Date: 30-May-2016

Relations

• Revises: IEC 61094-5:2001 - Measurement microphones - Part 5: Methods for pressure calibration of working standard microphones by comparison
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61094-5 ®
Edition 2.0 2016-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Measurement microphones –
Part 5: Methods for pressure calibration of working standard microphones
by comparison
Électroacoustique – Microphones de mesure –
Partie 5: Méthodes pour l'étalonnage en pression par comparaison des
microphones étalons de travail

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IEC 61094-5 ®
Edition 2.0 2016-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Measurement microphones –

Part 5: Methods for pressure calibration of working standard microphones

by comparison
Électroacoustique – Microphones de mesure –

Partie 5: Méthodes pour l'étalonnage en pression par comparaison des

microphones étalons de travail

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-3434-1

– 2 – IEC 61094-5:2016 © IEC 2016
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 6
4 Reference environmental conditions . 7
5 Principles of pressure calibration by comparison . 7
5.1 Principles . 7
5.1.1 General principle . 7
5.1.2 General principles using simultaneous excitation . 7
5.1.3 General principles using sequential excitation . 8
5.2 Measuring the output voltages of the microphones . 8
6 Factors influencing the pressure sensitivity . 8
6.1 General . 8
6.2 Microphone pressure equalization mechanism . 8
6.3 Polarising voltage . 9
6.4 Reference shield configuration . 9
6.5 Pressure distribution over the diaphragms . 9
6.6 Dependence on environmental conditions . 10
6.7 Validation . 10
7 Calibration uncertainty components . 10
7.1 General . 10
7.2 Sensitivity of the reference microphone . 10
7.3 Measurements of microphone output . 11
7.4 Differences between the sound pressure at the test microphone and that at
the reference microphone . 11
7.5 Acoustic impedances of the microphones . 11
7.6 Microphone separation distance . 11
7.7 Microphone capacitance . 11
7.8 Microphone configuration during calibration . 11
7.9 Uncertainty on pressure sensitivity level . 12
Annex A (informative)  Examples of couplers and jigs for simultaneous excitation . 13
A.1 A coupler for use with WS2 microphones at frequencies up to 10 kHz . 13
A.2 A jig for use with WS2 or WS3 microphones at frequencies up to 20 kHz . 14
Annex B (informative) Examples of couplers for sequential excitation . 16
B.1 A coupler for use with LS1 microphones at frequencies up to 8 kHz . 16
B.2 A coupler for use with WS2 microphones at frequencies up to 16 kHz . 16
Annex C (informative) Determining the open-circuit sensitivity of a measurement
microphone without using the insert-voltage method . 18
Annex D (informative) Typical uncertainty analysis . 19
D.1 Introduction . 19
D.2 Analysis . 19
D.3 Combined and expanded uncertainties . 21
Bibliography . 22

Figure A.1 – A coupler for use with WS2 microphones . 13

Figure A.2 – A jig fitted with an LS2 and WS2 microphone . 14
Figure A.3 – Example arrangement of LS2 and WS2 microphones in a jig . 14
Figure A.4 – Example arrangement of LS2 and WS3 microphones in a jig . 14
Figure B.1 – A coupler for use with LS1 microphones . 16
Figure B.2 – A coupler for use with WS2 microphones . 17

Table A.1 – Calculated corrections to be added to the sensitivity level of the WS3
microphone when using the arrangement in Figure A.4 . 15
Table D.1 – Example uncertainty budget . 20

– 4 – IEC 61094-5:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS – MEASUREMENT MICROPHONES –

Part 5: Methods for pressure calibration of working
standard microphones by comparison

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