IEC 61094-2:2009
Current
The latest, up-to-date edition.
Electroacoustics - Measurement microphones - Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique
Hardcopy , PDF
English - French
20-02-2009
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Reference environmental conditions
5 Principles of pressure calibration by reciprocity
5.1 General principles
5.1.1 General
5.1.2 General principles using three microphones
5.1.3 General principles using two microphones and an
auxiliary sound source
5.2 Basic expressions
5.3 Insert voltage technique
5.4 Evaluation of the acoustic transfer impedance
5.5 Heat-conduction correction
5.6 Capillary tube correction
5.7 Final expressions for the pressure sensitivity
5.7.1 Method using three microphones
5.7.2 Method using two microphones and an auxiliary
sound source
6 Factors influencing the pressure sensitivity of microphones
6.1 General
6.2 Polarizing voltage
6.3 Ground-shield reference configuration
6.4 Pressure distribution over the diaphragm
6.5 Dependence on environmental conditions
6.5.1 Static pressure
6.5.2 Temperature
6.5.3 Humidity
6.5.4 Transformation to reference environmental conditions
7 Calibration uncertainty components
7.1 General
7.2 Electrical transfer impedance
7.3 Acoustic transfer impedance
7.3.1 General
7.3.2 Coupler properties
7.3.3 Microphone parameters
7.4 Imperfection of theory
7.5 Uncertainty on pressure sensitivity level
Annex A (normative) Heat conduction and viscous losses
in a closed cavity
Annex B (normative) Acoustic impedance of a capillary tube
Annex C (informative) Examples of cylindrical couplers for
calibration of microphones
Annex D (informative) Environmental influence on the
sensitivity of microphones
Annex E (informative) Methods for determining microphone
parameters
Annex F (informative) Physical properties of humid air
IEC 61094-2:2009 is applicable to laboratory standard microphones meeting the requirements of IEC 61094-1 and other types of condenser microphone having the same mechanical dimensions and specifies a primary method of determining the complex pressure sensitivity so as to establish a reproducible and accurate basis for the measurement of sound pressure. This second edition cancels and replaces the first edition published in 1992. This second edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- an update of Clause 6 to fulfil the requirements of ISO/IEC Guide 98-3;
- an improvement of the heat conduction theory in Annex A;
- a revision of Annex F: Physical properties of humid air.
| Committee |
TC 29
|
| DevelopmentNote |
Supersedes IEC 60327. (12/2001) Stability Date: 2018. (09/2017)
|
| DocumentType |
Standard
|
| Pages |
99
|
| PublisherName |
International Electrotechnical Committee
|
| Status |
Current
|
| Supersedes |
| Standards | Relationship |
| ASA/ANSI S1.15 PART 2:2021 | Identical |
| NF EN 61094-2 : 2009 | Identical |
| GOST R IEC 61094-2 : 2011 | Identical |
| NEN EN IEC 61094-2 : 2009 | Identical |
| BS EN 61094-2:2009 | Identical |
| EN 61094-2:2009 | Identical |
| DIN EN 61094-2:2009-09 | Identical |
| I.S. EN 61094-2:2009 | Identical |
| ASA/ANSI S1.15:2021/Part 2/IEC 61094-2:2009(R2026) | Identical |
| BS EN 60317-33:2016 | Identical |
| BS EN 60974-7:2005 | Identical |
| PN EN 61094-2 : 2010 | Identical |
| UNE-EN 61094-2:2009 | Identical |
| I.S. EN 61094-2:1994 | Identical |
| NEN 11094-2 : 1994 | Identical |
| CEI EN 61094-2 : 2014 | Identical |
| UNE-EN 61094-2:2011 | Identical |
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