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JJG 1095-2024 English PDF

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JJG 1095-2024: Verification Regulation of Environmental Noise Automatic Monitors
Status: Valid

JJG 1095: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 1095-2024English859 Add to Cart 6 days [Need to translate] Verification Regulation of Environmental Noise Automatic Monitors Valid JJG 1095-2024
JJG 1095-2014English699 Add to Cart 5 days [Need to translate] Verification Regulation of Environmental Noise Automatic Monitors Valid JJG 1095-2014

Basic data

Standard ID JJG 1095-2024 (JJG1095-2024)
Description (Translated English) Verification Regulation of Environmental Noise Automatic Monitors
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 42,432
Date of Issue 2024-09-18
Date of Implementation 2025-03-18
Issuing agency(ies) State Administration for Market Regulation

JJG 1095-2024: Verification Regulation of Environmental Noise Automatic Monitors

---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.
National Metrology Verification Regulations of the People's Republic of China Verification procedures for automatic environmental noise monitoring instruments Released on 2024-09-18 2025-03-18 Implementation The State Administration for Market Regulation issued Environmental noise automatic monitoring instrument Verification procedures Replace JJG 1095-2014 Responsible unit. National Acoustic Metrology Technical Committee Main drafting unit. Zhejiang Institute of Metrology China National Institute of Metrology Hangzhou Aihua Intelligent Technology Co., Ltd. Participating in the drafting. Hubei Institute of Metrology and Testing Technology Guangdong Institute of Metrology This regulation is entrusted to the National Acoustic Metrology Technical Committee for interpretation. The main drafters of this regulation are. Yao Lei (Zhejiang Institute of Metrology) Niu Feng (China National Institute of Metrology) Xiong Wenbo (Hangzhou Aihua Intelligent Technology Co., Ltd.) Participating drafters. Qiu Jianmin (Zhejiang Institute of Metrology) Yao Qiuping (Hubei Institute of Metrology and Testing Technology) Li Minyi (Guangdong Institute of Metrology) Zhang Zhikai (Zhejiang Institute of Metrology)

Table of contents

Introduction (II) 1 Scope(1) 2 References(1) 3 Terminology and units of measurement (1) 4 Overview(1) 5 Metrological performance requirements (2) 5.1 Indicator sound level adjustment (2) 5.2 Frequency Weighting (2) 5.3-level linearity(3) 5.4 Self-generated noise (3) 5.5 Time weighting F and S (3) 5.6 Tone burst response (3) 5.7 Repeated tone burst response (4) 5.8 Overload indication (4) 5.9 C-weighted peak sound level (4) 5.10 Calculation function (5) 5.11 Relative attenuation at the filter center frequency (5) 5.12 Relative attenuation of filters (5) 5.13 Filter order linearity (5) 6 General technical requirements(5) 6.1 Marking, instructions and functional inspection (5) 6.2 Appearance(5) 7 Measuring instrument control (6) 7.1 Verification conditions (6) 7.2 Verification Items (7) 7.3 Verification methods (8) 7.4 Processing of verification results (17) 7.5 Verification cycle (17) Appendix A Maximum allowable measurement uncertainty (18) Appendix B Format of the inner pages of the verification certificate and verification result notification (20) Appendix C Measurement Uncertainty Evaluation Examples (32) Appendix D Other methods for frequency-weighted acoustic signal testing (35)

Introduction

JJF1001-2011 "General metrological terms and definitions", JJF1002-2010 "Rules for the preparation of national metrological verification procedures", JJF1059.1-2012 "Evaluation and Expression of Uncertainty in Measurement" together constitute the basic series of specifications for the formulation of this regulation. Reference is made to GB/T 3785.1-2023 "Electroacoustic Sound Level Meters Part 1.Specifications", GB/T 3785.2-2023 "Electroacoustic Sound Level Meters Part 1.Specifications" GB/T 3785.3-2018 "Electroacoustic Sound Level Meters Part 2.Type Evaluation Test" and GB/T 3785.3-2018 "Electroacoustic Sound Level Meters Part 3. Division. Cycle Test. This regulation replaces JJG 1095-2014 "Verification Regulation for Automatic Environmental Noise Monitors". Compared with the previous version, the main technical changes are as follows. ---The "tolerance" of each technical indicator is changed to "acceptance limit". And the qualified judgment is changed to the measured value and the set value. The deviation of the measured target does not exceed the applicable acceptance limit and the measurement uncertainty does not exceed the maximum allowable measurement uncertainty in Table A.1. Measurement uncertainty. --- Modified the verification of indicated sound level adjustment, self-generated noise, level linearity, C-weighted peak sound level and overload indication Frequency and amplitude, tone burst response, duration of repeated tone burst response, calculation function, etc. --- Added verification of C and Z frequency weighting relative to A frequency weighting sound level indication. --- Added the content related to "Relative attenuation at the center frequency of the filter". --- Modified some of the original expressions of "relative attenuation of the filter" and "linear range of the filter". --- Modified some equipment requirements in "Measurement standards and main supporting equipment" and added "Microphone preamplifier The requirements for "sound level meter" and "digital frequency meter" have been revised, and the requirements for "sound level meter" have been deleted. --- Modified the “Test environment conditions”. --- Modified the name of Appendix A to "Maximum allowable measurement uncertainty" and updated the "Clause "No." and "Maximum permissible measurement uncertainty". --- Added Appendix D Other methods for frequency-weighted acoustic signal test. The previous versions of this regulation are as follows. ---JJG 1095-2014. Verification procedures for automatic environmental noise monitoring instruments

1 Scope

This regulation applies to level 1 and level 2 environmental noise automatic monitoring devices (also known as environmental noise automatic monitoring terminals, Initial calibration, subsequent calibration and in-use inspection of the monitoring instrument.

2 References

This regulation refers to the following documents. JJG 176 Verification Procedure for Sound Calibrators JJG 188-2017 Sound Level Meter Verification Procedure JJG 449-2014 Octave and fractional octave filter verification procedures JJG 482-2017 Verification Procedure for Laboratory Standard Microphone (Free Field Reciprocity Method) JJG 778-2019 Noise Statistical Analyzer Verification Procedure JJG 790-2005 Verification Procedure for Laboratory Standard Microphone (Coupled Cavity Reciprocity Method) JJG 1019-2007 Verification Procedure for Working Standard Microphone (Coupled Cavity Comparison Method) JJF1001-2011 General metrological terms and definitions JJF1034-2020 Acoustic Metrology Terms and Definitions JJF1293-2011 Electrostatic Actuator Calibration Specification GB/T 3102.7 Acoustic quantities and units GB/T 3947-1996 Acoustic terminology GB/T 17312-1998 Random-incidence and diffuse-field calibration of sound level meters For any referenced document with a date, only the version with the date is applicable to this Regulation; for any referenced document without a date, The latest version (including all amendments) shall apply to this regulation.

3 Terminology and units of measurement

JJG 188-2017, JJG 449-2014, JJG 778-2019, JJF1001-2011, JJF1034- The terms and definitions defined in GB/T 3947-1996 and GB/T 3947-1996 apply to this regulation. This specification adopts the acoustic quantities and units specified in GB/T 3102.7.

4 Overview

The monitoring instrument is composed of an outdoor microphone unit, a signal processing unit, a data recording and sending unit, and a display unit. The device is composed of a 24-hour continuous measurement of environmental noise without human supervision. Monitors are divided into two levels according to performance. Level 1 and Level 2.

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