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GB/T 20441.6-2017 English PDF

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GB/T 20441.6-2017: Electroacoustics -- Measurement microphones -- Part 6: Electrostatic actuators for determination of frequency response
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GB/T 20441.6-2017English519 Add to Cart 4 days [Need to translate] Electroacoustics -- Measurement microphones -- Part 6: Electrostatic actuators for determination of frequency response Valid GB/T 20441.6-2017

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Basic data

Standard ID GB/T 20441.6-2017 (GB/T20441.6-2017)
Description (Translated English) Electroacoustics -- Measurement microphones -- Part 6: Electrostatic actuators for determination of frequency response
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard A59
Classification of International Standard 17.140.50
Word Count Estimation 26,268
Date of Issue 2017-11-01
Date of Implementation 2018-05-01
Quoted Standard IEC 61094-1; IEC 61094-2; IEC 61094-3; IEC 61094-5; ISO/IEC GUIDE EXPRESS-1995
Adopted Standard IEC 61094-6-2004, IDT
Regulation (derived from) National Standard Announcement 2017 No. 29
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies: 1. Electrostatic exciter for the design of conductive diaphragm microphones; 2. Confirmation of electrostatic exciter; 3. Determining the response of the microphone electrostatic exciter. This section applies to the electrostatic actuator applications, including the following: 1. Detection of microphone frequency response changes in technology; 2. Determination of the environment on the microphone response of the technology; 3. In the absence of professional acoustic test equipment, according to The type of microphone used, and the predetermined corrections for the electrostatic actuator used to determine the free field response or the sound pressure response of the microphone; 4. a technique applied to high frequencies that can not be covered by acoustic excitation calibration methods.

GB/T 20441.6-2017: Electroacoustics -- Measurement microphones -- Part 6: Electrostatic actuators for determination of frequency response


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Electroacoustics. Measurement microphones. Part 6. Electrostatic actuators for determination of frequency response ICS 17.140.50 A59 National Standards of People's Republic of China Electro - acoustic measuring microphones Part 6. Electrostatic exciter for measuring frequency response Part 6.Electrostaticactuatorsfordeterminationoffrequencyresponse (IEC 61094-6.2004, IDT) Posted.2017-11-01 2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Foreword Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Reference environmental conditions 2 5 Electrostatic exciter works 2 5.1 Overview 2 5.2 static pressure 3 5.3 Electrostatic exciter response 4 6 Electrostatic exciter design 5 6.1 Overview 5 6.2 Design 5 7 Confirm 6 7.1 Overview 6 7.2 Measurement repeatability 6 7.3 Coherence of a given type of electrostatic actuator 6 7.4 Electrostatic exciter response level and sound pressure response level of the consistency of the difference 6 8 Electrostatic exciter response measurement 7 8.1 Electrostatic exciter response measurement system 7 8.2 uncertainty component 8 9 Electrostatic exciter application 9 9.1 Overview 9 9.2 Measurement system frequency response test 9 9.3 Measurement of microphone environmental characteristics of measuring system 9 9.4 Determination of free-field frequency response and sound pressure frequency response 9 9.5 Electrostatic exciter vhf response measurement 10 Appendix A (informative) Example of electrostatic actuator design 11 A.1 Electrostatic exciter for WS1 type microphones 11 A.2 Electrostatic exciter for WS2 microphone 12 A.3 Electrostatic exciter that forms integral part of the boot Appendix B (Informative) Electrostatic exciter response measuring device 14 Appendix C (Informative) Typical Uncertainty Analysis 15 C.1 Introduction 15 C.2 Analysis 15 C.3 Synthesis Uncertainty and Extended Uncertainty 16 Appendix D (Informative) Typical Measurement Microphone free field, the difference between the sound pressure and the electrostatic actuator response 18 Figure 1 principle of the microphone and electrostatic actuator 3 Fig.2 lumped parameter model of the measuring microphone excited by the electrostatic exciter 5 Figure A.1 Example of electrostatic exciter for WS1 type microphone Figure A.2 Example 12 of electrostatic exciter for WS2 type microphones Figure A.3 Example of an electrostatic exciter that forms an integral part of a microphone boot Figure A.4 Example of electrostatic exciter in conjunction with weather protection 13 Figure B.1 Typical device for measuring the response of a microphone electrostatic actuator 14 Figure D.1 shows an example of the difference between the relative sound pressure frequency response and the electrostatic exciter frequency response of four different types of measuring microphones. WS1P (a) and WS1F (b) with a nominal sensitivity of -26dB (referenced to 1V/Pa) and nominal sensitivity Is WS2P (c) and WS2F (d) 18 of -38dB (referenced to 1V/Pa) Figure D.2 WS1, WS2 and WS3 Microphones Relative Free-field Frequency Response vs. Electrostatic Exciter Frequency Response Without Guard Example of difference between 18 Figure D.3 WS2 microphone relative free-field frequency response and electrostatic exciter frequency response with model-related shield Example 19 of the difference Figure D.4 Add the model-dependent free field and electrostatic actuator difference shown in Figure D.3 to the microphone's electrostatic actuator response Example 19 b) of obtaining a relative free-field frequency response on a) Table C.1 Uncertainty 16

Foreword

GB/T 20441 "electro-acoustic measuring microphone" is divided into 8 parts. --- Part 1. Laboratory standard microphone specifications; --- Part 2. The primary method of reciprocal sound pressure calibration of laboratory standard microphones; --- Part 3. Reciprocal technique for the free field calibration of laboratory standard microphones method; --- Part 4. Working standard microphone specifications; --- Part 5. Working standard microphone sound pressure calibration comparison method; --- Part 6. Electrostatic exciters used to determine the frequency response; --- Part 7. Laboratory standard microphone free field and sound pressure field sensitivity of the difference between; --- Part 8. Determination of working standard microphones free field sensitivity comparison method. This section GB/T 20441 Part 6. This section drafted in accordance with GB/T 1.1-2009 given rules. This section uses the translation method is equivalent to using the international standard IEC 61094-6.2004 "Measuring microphones Part 6. Used to determine the frequency of sound Should be the electrostatic actuator. " The documents of our country that are consistent with the corresponding international documents that are normative references in this section are as follows. --- GB/T 20441.1-2010 Electroacoustics measuring microphones Part 1. Laboratory Standard Microphone Specification (IEC 61094-1.2000, IDT); --- GB/T 20441.3-2010 Electro-acoustic measuring microphone Part 3. The use of reciprocity technology laboratory standard microphone The free-field calibration of the primary method (IEC 61094-3.1995, IDT); --- JJF1059.1-2012 Evaluation and Expression of Uncertainty in Measurement (ISO /IEC GUIDE98-3.2008 Uncertainty ofmeasurement-Part 3.Guidetotheexpressionofuncertaintyinmeasurement). This section made the following editorial changes. --- For ease of reference, an increase of 9.2 in the reference document "IEC 61672-1" footnote. Please note that some of this document may be patentable. The issuing agencies of this document do not bear the responsibility of identifying these patents. This part is proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This part of the National Electroacoustic Standardization Technical Committee (SAC/TC23) centralized. This section is drafted. Hengyang Hengyi Electric Co., Ltd., Beijing reputation Acoustic Technology Co., Ltd., Hangzhou Aihua Instrument Co., Ltd. Third Institute of China Electronics Technology Group Corporation, China Institute of Metrology. The main drafters of this section. Liu Xiang Heng, Tan Teng, Wu Qunli, Zhang Shaodong, Han Jie, Niu Feng. Electro - acoustic measuring microphones Part 6. Electrostatic exciter for measuring frequency response

1 Scope

GB/T 20441 provisions of this section. --- Electrostatic exciters with conductive diaphragm microphone design guidelines; --- Electrostatic exciter confirmation method; --- Determination of microphone electrostatic actuator response method. This section applies to electrostatic exciter applications, including the following. --- Detection of microphone frequency response changes in technology; --- Determination of the impact of the environment on the microphone response technology; --- In the absence of professional acoustic test equipment, according to the type of microphone used and the use of electrostatic actuator pre-determined Correction of the microphone to determine the free field response or sound pressure response of the technology; --- Applied to the acoustic excitation calibration methods can not be covered by high-frequency technology.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. IEC 61094-1 Measurement Microphone Part 1. Laboratory Standard Microphone Specification (Measurement Microphones- Part 1.Specifications for laboratory standard microrophones) IEC 61094-2 Measurement microphones - Part 2. Primary method of sound pressure calibration of laboratory standard microphones using reciprocity techniques (Measurementmicrophones-Part 2.Primarymethodforpressurecalibrationoflaboratorystandard microphonesbythereciprocitytechnique) IEC 61094-3 Measurement microphones Part 3. Primary side calibration of free-field calibration of laboratory standard microphones using reciprocity techniques (Measurementmicrophones-Part 3.Primarymethodforfree-fieldcalibrationoflaboratorystand- ardmicrophonesbythereciprocitytechnique) IEC 61094-5 Measurement microphones Part 5. Working standard Microphone sound pressure calibration comparison method (Measurementmi- crophones-Part 5.Methodsforpressurecalibrationofworkingstandardrophonesbycompari- son ISO /IEC GUIDEEXPRESS.1995 Measurement Uncertainty Guide [Guidetotheexpressionofuncer- taintyinmeasurement (GUM)]

3 Terms and definitions

IEC 61094-1 defines the following terms and definitions apply to this document. 3.1 Electrostatic exciter electrostaticactuator A device for determining the frequency response of a microphone comprising a conductive rigid plate placed near the microphone diaphragm,

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