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JJG 778-2019: Noise Level Statistical Analyzers
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JJG 778: Historical versions

Std IDVersionUSDBuyDeliver [PDF] inTitle (Description)
JJG 778-2019English799 Add to Cart 6 days [Need to translate] Noise Level Statistical Analyzers
JJG 778-2005EnglishRFQ ASK 5 days [Need to translate] Verification regulation of noise level statistical analyzers
JJG 778-1992English319 Add to Cart 3 days [Need to translate] Verification Regulation of Noise Level Statistical Analyzers

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Basic data

Standard ID JJG 778-2019 (JJG778-2019)
Description (Translated English) Noise Level Statistical Analyzers
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A59
Classification of International Standard 17.140
Word Count Estimation 37,399
Date of Issue 2019
Date of Implementation 2020-03-31
Issuing agency(ies) State Administration for Market Regulation

JJG 778-2019: Noise Level Statistical Analyzers


---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 Noise Statistics Analyzer) National Measurement Verification Regulations of the People's Republic of China Noise Statistics Analyzer Published on December 31,.2019 2020-03-31 Implementation Issued by the State Administration of Market Supervision and Administration Verification Regulation of Noise Statistics Analyzer Replace JJG 778-2005 Centralized unit. National Acoustic Metrology Technical Committee Drafting unit. Chinese Academy of Metrology Hunan Acoustic Instrument Control Technology Co., Ltd. Hangzhou Aihua Instrument Co., Ltd. State-owned 4380 Factory Jiaxing Branch Fujian Academy of Metrology This regulation is entrusted to the National Acoustic Measurement Technical Committee for interpretation Drafters of this regulation. Niu Feng (Chinese Academy of Metrology) Liu Xiangheng (Hunan Acoustic Instrument Control Technology Co., Ltd.) Xu Huan (Chinese Academy of Metrology) Xiong Wenbo (Hangzhou Aihua Instrument Co., Ltd.) Shu Guohua (State-owned 4380 Factory Jiaxing Branch) 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 Terminology (1) 3.2 Unit of measurement (2) 4 Overview (2) 5 Measurement performance requirements (3) 5.1 Indication sound level adjustment (3) 5.2 Frequency weighting (3) 5.3 linear (4) 5.4 Self-generated noise (4) 5.5 Time weighting F and S (4) 5.6 Sudden pronunciation response (4) 5.7 Repeated burst pronunciation response (5) 5.8 Calculation function (6) 6 General technical requirements (6) 6.1 Logo (6) 6.2 Functional requirements (6) 6.3 Appearance and power supply (6) 7 Control of measuring instruments (6) 7.1 Verification conditions (6) 7.2 Verification items (7) 7.3 Verification method (8) 7.4 Processing of verification results (16) 7.5 Verification period (16) Appendix A Maximum allowable measurement uncertainty (17) Appendix B. Other methods of frequency-weighted acoustic signal testing (18) Appendix C. Internal page format of the verification certificate and verification result notice (20) Appendix D Evaluation Examples of Measurement Uncertainty (30)

Introduction

This regulation is based on the rules and format given in JJF1002-2010 "Rules for Compiling National Measurement Verification Regulations" prepared by. This specification refers to the international standard IEC 61672-1.2013 "Electroacoustic Sound Level Meter Part 1.Specification" And IEC 61672-3.2013 "Electroacoustic Sound Level Meter Part 3.Periodic Test", and also refer to IEC 61672-2. 2013 "Electroacoustic Sound Level Meter Part 2.Type Evaluation Test". This regulation replaces JJG 778-2005 "Noise Statistics Analyzer". Compared with JJG 778-2005, the main technology The changes are as follows. --- Added the definition of the terms "cumulative percentage sound level" and "time average sound level"; ---The "tolerance" of each measurement characteristic value is modified to "acceptance limit", and the qualified judgment is modified to the measured value and design The deviation of the target does not exceed the applicable acceptance limit, and the measurement uncertainty does not exceed the applicable maximum allowable measurement uncertainty Degree --- Deleted the content of flat frequency response and overload indication; --- Modified the static pressure conditions in the verification environmental conditions; --- Increased the requirements for the amplitude sweep performance of the audio signal generator; --- The "visual inspection" in the verification project was changed to "general technical requirements"; --- Deleted the "Instruction Manual" in the verification project; --- Modified indication sound level adjustment, frequency weighting, level linearity, spontaneous noise, burst pronunciation response, repeated burst Verification method of sound response and calculation function; --- Added appendix "Other methods of frequency weighted acoustic signal test". The release of previous versions of this regulation. ---JJG 778-2005; ---JJG 778-1992. Verification Regulation of Noise Statistics Analyzer

1 Scope

This regulation is applicable to the first verification, subsequent verification and in-use inspection of level 1 and level 2 noise statistical analyzers.

2 Reference documents

This regulation refers to the following documents. JJG 176-2005 Sound Calibrator JJG 188-2017 sound level meter JJG 482-2017 laboratory standard microphone (free field reciprocity method) JJG 790-2005 Laboratory standard microphone (Coupling cavity reciprocity method) JJF1001-2011 General Measurement Terms and Definitions JJG 1019-2007 working standard microphone (coupling cavity comparison method) JJF1034-2005 Acoustic metrology terms and definitions JJF1059.1-2012 Evaluation and expression of measurement uncertainty JJF1147-2006 Specification for acoustic characteristics calibration of anechoic and semi-anechoic rooms JJF1293-2011 Calibration Specification for Electrostatic Exciter GB/T 3102.7 Acoustic quantities and units GB/T 3222.1-2006 Description, measurement and evaluation of acoustic environmental noise Part 1.Basic parameters And evaluation methods GB/T 3947-1996 Acoustic terms GB/T 17312 Sound Level Meter Random Incident and Diffusion Field Calibration IEC 61672-1.2013 Electroacoustic Sound Level Meter Part 1.Specification (Electroacoustics-Sound levelmeters-Part 1.Specifications) IEC 61672-2.2013 Electroacoustic sound level meter Part 2.Type evaluation test (Electroacous- tics-Soundlevelmeters-Part 2.Patternevaluationtests) IEC 62585 Electroacoustics Method for Determining the Correction Value of the Sound Field Meter Free Field Response (Electroacoustics- Methodstodeterminecorrectionstoobtainthefree-fieldresponseofasoundlevelmeter) 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

3.1 Terminology JJF1001-2011, JJF1034-2005, JJG 188-2017 and GB/T 3947-1996 The following terms and definitions apply to this regulation. 3.1.1 Cumulative percentage sound level percentilelevels ...

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