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Working Standard Microphones(Free-field Comparison Method)
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Basic data
| Standard ID | JJG 1172-2019 (JJG1172-2019) |
| Description (Translated English) | Working Standard Microphones(Free-field Comparison Method) |
| Sector / Industry | Metrology & Measurement Industry Standard |
| Classification of Chinese Standard | A59 |
| Classification of International Standard | 17.140 |
| Word Count Estimation | 22,274 |
| Date of Issue | 2019 |
| Date of Implementation | 2020-03-31 |
| Issuing agency(ies) | State Administration for Market Regulation |
JJG 1172-2019: Working Standard Microphones(Free-field Comparison Method)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Verification Regulation of Working Standard Microphone (Free Field Comparison Method))
National Measurement Verification Regulations of the People's Republic of China
Working standard microphone
(Free field comparison method)
Published on December 31,.2019
2020-03-31 Implementation
Issued by the State Administration of Market Supervision and Administration
Working standard microphone (free field comparison method)
Verification regulations
Centralized unit. National Acoustic Metrology Technical Committee
Drafting unit. Chinese Academy of Metrology
Shenzhen Institute of Metrology and Quality Inspection
Zhejiang Academy of Metrology
Fujian Academy of Metrology
This regulation is entrusted to the National Acoustic Measurement Technical Committee for interpretation
Drafters of this regulation.
Feng Xiujuan (Chinese Academy of Metrology)
He Longbiao (Chinese Academy of Metrology)
Niu Feng (Chinese Academy of Metrology)
Guoqing Zhang (Shenzhen Institute of Metrology and Quality Inspection)
Qiu Jianmin (Zhejiang Institute of Metrology)
Li Qun (Fujian Institute of Metrology)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2 References (1)
3 Terms and units of measurement (1)
3.1 Working standard microphone (2)
3.2 Reference microphone (2)
3.3 Monitoring microphone (2)
4 Overview (2)
5 Measurement performance requirements (2)
5.1 Free field sensitivity level (2)
5.2 Frequency response of sensitivity level (2)
6 General technical requirements (3)
6.1 Logo (3)
6.2 Factory data (3)
7 Control of measuring instruments (3)
7.1 Verification conditions (3)
7.2 Verification items (4)
7.3 Verification method (5)
7.4 Processing of verification results (7)
7.5 Verification period (7)
Appendix A. Amendment of environmental parameters with reference to the free field sensitivity level of the microphone (8)
Appendix B. Internal page format of verification certificate and verification result notification (9)
Appendix C Examples of measurement uncertainty assessment (11)
Introduction
This regulation is based on the rules and format given in JJF1002-2010 "Rules for Compiling National Measurement Verification Regulations"
prepared by.
This regulation refers to the international standard IEC 61094-8.2012 "Electroacoustic Measurement Microphone Part 8.Determination
"Comparison of free-field sensitivity for standard microphones" and GB/T 20441.4-2006 "Measurement Microphones Part 4"
Points. Working Standard Microphone Specification".
Published JJG 1019-2007 "Working Standard Microphone (Coupling Cavity Comparison Method)", JJG 175-2015
"Working Standard Microphone (Electrostatic Exciter Method)" and this regulation replace JJG 175-1998 "Test Capacitance
"Microphone", this regulation replaces the content of the free field comparison method in JJG 175-1998 "Testing Condenser Microphones".
This regulation is issued for the first time.
Verification Regulation of Working Standard Microphone (Free Field Comparison Method)
1 Scope
This regulation is applicable to meet GB/T 20441.4-2006 "Measurement Microphone Part 4.Working Standard Sound Transmission
The first verification, follow-up verification and in-use inspection of the working standard microphones specified in the "Microphone Specification".
2 Reference documents
This regulation refers to the following documents.
JJG 175-2015 working standard microphone (electrostatic exciter method)
JJF1001 General Measurement Terms and Definitions
JJG 1019-2007 working standard microphone (coupling cavity comparison method)
JJF1034 Terms and Definitions of Acoustic Measurement Terms
JJF1059.1 Evaluation and expression of measurement uncertainty
JJF1147 Calibration Specification for Acoustic Characteristics of Anechoic Room and Semi-anechoic Room
GB/T 3102.7 Acoustic quantities and units
GB/T 3947 Acoustic terms
GB/T 15173-2010 Electroacoustic Acoustic Calibrator
GB/T 20441.3-2010 Electroacoustic measurement microphones Part 3.Use reciprocity technology for laboratory
Primary method of free field calibration of standard microphone
GB/T 20441.4-2006 Measurement microphones Part 4.Specifications of working standard microphones
IEC 61094-2 Electroacoustic Measurement Microphone Part 2.Using Reciprocity Technology to Transmit Laboratory Standard Sound
The original method of the sound pressure calibration of the instrument (Electroacoustics-Measurementmicrophones-Part 2.Pri-
marymethodforpressurecalibrationoflaboratorystandardmicrophonesbythereciproc-
itytechnique)
IEC 61094-3 Electroacoustic Measurement Microphone Part 3.Using Reciprocity Technology to Transmit Laboratory Standard Sound
The primary method of free field calibration of the instrument (Electroacoustics-Measurementmicrophones-Part 3.
Primarymethodforfree-fieldcalibrationoflaboratorystandardmicrophonesbythereci-
procitytechnique)
IEC 61094-8.2012 Electroacoustic measurement microphones Part 8.Determination of working standard microphone free field
Sensitivity comparison method (Electroacoustics-Measurementmicrophones-Part 8.Methodsfor
determiningthefree-fieldsensitivityofworkingstandardmicrophonesbycomparison)
For dated references, only the dated versions are applicable to this Regulation; for those without dates
The latest version (including all amendments) is applicable to this regulation.
3 Terms and units of measurement
This regulation adopts the quantity and unit specified in GB/T 3102.7.
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