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JJG 277-2017: Reference Sound Sources
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
JJG 277-2017	English	559	Add to Cart	4 days [Need to translate]	Reference Sound Sources
JJG 277-1998	English	359	Add to Cart	3 days [Need to translate]	Verification regulation of reference sound source
JJG 277-1981	English	RFQ	ASK	3 days [Need to translate]	Verification Regulation of Reference Sound Source

JJG 277-2017: Reference Sound Sources

---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.
(Standard sound source verification procedures) National metrological verification regulations of the People's Republic of China Standard sound source Published on.2017-11-20 2018-05-20 Implementation The State Administration of Quality Supervision, Inspection and Quarantine issued Standard Sound Source Certification Procedure Replacing JJG 277-1998 Integral Unit. National Acoustic Measurement Technical Committee Drafted by. China Academy of Metrology Hubei Institute of Measurement and Measurement Technology Henan Institute of Metrology Wuxi Jixing Auto Acoustic Parts Technology Co., Ltd. This procedure entrusts the National Acoustic Measurement Technical Committee to explain Drafters of this regulation. Niu Feng (China Institute of Metrology) Yao Qiuping (Hubei Provincial Measurement and Measurement Technology Research Institute) Wei Ping (Henan Provincial Institute of Metrology) He Longbiao (China Institute of Metrology) Huang Wei (Wuxi Jixing Auto Acoustic Parts Technology Co., Ltd.) Feng Xiujuan (China Institute of Metrology)

table of Contents

Introduction (II) 1 Scope (1) 2 References (1) 3 Terms and units of measure (1) 3.1 Free sound field above a reflective surface (2) 3.2 Semi-anechoic chamber (2) 3.3 Measuring surface (2) 3.4 Surface Sound Pressure Level (2) 3.5 Sound Power Level (2) 3.6 Directivity Index (2) 3.7 Test frequency range (3) 4 Overview (3) 5 Metrological performance requirements (3) 5.1 Band Sound Power Level and A-weighted Sound Power Level (3) 5.2 Directivity Index (3) 5.3 Short-term stability of sound power output (3) 6 General technical requirements (3) 6.1 Signs (3) 6.2 Dimensions (4) 6.3 Delivery Technical Data (4) 7 Measuring Instruments Control (4) 7.1 Verification conditions (4) 7.2 Verification Projects (5) 7.3 Verification Methods (5) 7.4 Processing of verification results (8) 7.5 Certification Period (9) Appendix A Method for synthesizing A-weighted sound power levels using octave or 1/3 octave sound power levels (10) Appendix B Microphone position diagram (12) Appendix C Internal Page Format of Notification of Verification Certificate and Verification Results (14)

Introduction

This regulation is based on rules and formats given in JJF1002-2010 "Rules for the preparation of national metrological verification regulations" prepared by. This procedure mainly refers to the international standard ISO 6926.2016 for acoustics. Standard Sound Source Performance and Calibration Requirements, ISO 3745.2012 Acoustics and Sound Pressure Determination of Noise Source Sound Power Level Acoustic Energy Level Anechoic Room and Semi-anechoic Chamber Precision Method and ISO 3741.2010 Sound source sound power level and sound energy level reverberation chamber precision method. This regulation is an amendment to JJG 277-1998 "Standard Sound Source", compared with JJG 277-1998, it is mainly revised The content of the reservation is as follows. --- Added reference files; --- Added terms and units of measure; --- Removed the effect of the change in the power supply voltage; ---According to the international standard ISO 6926.2016 Acoustics for the performance of standard sound sources for sound power level determination And calibration requirements, modified the requirements of each measurement feature. --- Expands the frequency application range of the standard acoustic source of the semi-anechoic chamber method, extending from 100Hz to 10000Hz 50Hz ~.20000Hz, and gives the requirements of the measurement characteristics at the extended frequency. --- According to the international standard ISO 3745.2012 "acoustic sound pressure method to determine the sound power level and acoustic energy of noise sources Anechoic chamber and semi-anechoic chamber precision method, modifying the number of microphones on the hemispherical measurement surface in a semianeospheric chamber and Location, and in Appendix B, the method of layout of other measurement paths is given; introduced in the calculation formula of sound power level New environmental corrections. --- According to the international standard ISO 3741.2010 "acoustic sound pressure method to determine the sound power level and acoustic energy of noise sources Level reverberation room precision method, modified the relevant content of the test in the reverberation room. The previous version of this regulation was released. ---JJG 277-1998; ---JJG 277-1981. Standard Sound Source Certification Procedure

1 Scope

This procedure is applicable to the first verification, subsequent verification and in-use inspection of standard sound sources.

2 references

This procedure refers to the following documents. JJG 176-2005 Sound Calibrator JJG 449-2014 Octave and Fractional Octave Filters JJF1001-2011 Universal Measurement Terms and Definitions JJF1034-2005 Acoustic Measurement Terms Terms and Definitions JJF1288-2011 Multichannel Acoustic Analyzer Calibration Specification GB/T 3102.7-1993 Acoustic quantities and units GB/T 3947-1996 Acoustic terms GB/T 17247.1-2000 Acoustic outdoor sound attenuation - Part 1. Calculation of atmospheric sound absorption GB/T 20441.4-2006 Measurement microphones Part 4. Working standard microphone specifications ISO 3741.2010 Acoustics - Sound pressure method for the determination of sound power levels and sound energy levels of noise sources - Reverberation room method (Acoustics-Determinationofsoundpowerlevelsandsoundenergylevelsofnoise sourcesusingsoundpressure-Precisionmethodsforreverberationtestrooms) ISO 3745.2012 Acoustics - Sound pressure method for the determination of sound power levels and acoustic energy levels of noise sources Anechoic chambers and semi-anesthesias Acoustics-Determinationofsoundpowerlevelsandsoundenergylevelsof noisesourcesusingsoundpressure-Precisionmethodsforanechoicroomsandhemi-ane- Choicrooms) ISO 6926.2016 Acoustics - Performance and calibration requirements for standard sound sources for sound power level determination (Acous- tics-Requirementsfortheperformanceandcalibrationofreferencesoundsourcesused Forthedeterminationofsoundpowerlevels) For dated references, only the dated version applies to this procedure; any undated references The latest version (including all amendments) is applicable to this procedure.

3 Terms and units of measure

This procedure uses the quantities and units specified in GB/T 3102.7-1993. Terms and definitions defined in JJF1001-2011, JJF1034-2005, and GB/T 3947-1996 Applicable to this procedure. Based on needs, this regulation cites the following terms in ISO 6926.2016 and ISO 3745.2012 and definition. ...