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JJG 176-2022 English PDF

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JJG 176-2022: Sound Calibrators
Status: Valid

JJG 176: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 176-2022English799 Add to Cart 6 days [Need to translate] Sound Calibrators Valid JJG 176-2022
JJG 176-2005English959 Add to Cart 5 days [Need to translate] Verification regulation of sound calibrators Obsolete JJG 176-2005
JJG 176-1995English679 Add to Cart 5 days [Need to translate] Verification Regulation of Sound Calibrator Obsolete JJG 176-1995
JJG 176-1976EnglishRFQ ASK 3 days [Need to translate] (Chinese Industry Standard) Obsolete JJG 176-1976

Standard similar to JJG 176-2022

JJG 249   JJG 404   JJG 134   

Basic data

Standard ID JJG 176-2022 (JJG176-2022)
Description (Translated English) Sound Calibrators
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 36,374
Date of Issue 2022-04-29
Date of Implementation 2022-10-29
Issuing agency(ies) State Administration for Market Regulation

JJG 176-2022: Sound Calibrators

---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.
Sound Calibrators National Metrology Verification Regulations of the People's Republic of China sound calibrator Released on 2022-04-29 Implementation on 2022-10-29 Released by the State Administration for Market Regulation Acoustic Calibrator Verification Regulations Replace JJG 176-2005 Responsible unit. National Acoustic Metrology Technical Committee Main drafting unit. China Institute of Metrology Hunan Sound Instrument Measurement and Control Technology Co., Ltd. Participated in the drafting unit. Shanghai Institute of Metrology and Testing Technology Aviation Industry Beijing Great Wall Metrology and Testing Technology Research Institute This regulation entrusts the National Acoustic Metrology Technical Committee to be responsible for interpretation The main drafters of this regulation. Bai Ying (National Institute of Metrology) Liu Xiangheng (Hunan Shengyi Measurement and Control Technology Co., Ltd.) Qin Chaoqi (National Institute of Metrology) He Longbiao (National Institute of Metrology) Participating drafters. An Zhaoliang (Shanghai Institute of Metrology and Testing Technology) Zheng Aijian (Beijing Great Wall Metrology and Testing Technology Research Institute of Aviation Industry)

Table of contents

Introduction (Ⅱ) 1 Scope(1) 2 References(1) 3 Terms and units of measurement(1) 3.1 Terms and Definitions(1) 3.2 Quantities and units(3) 4 Overview(3) 5 Metrological performance requirements (3) 5.1 Sound pressure level(3) 5.2 Short-term level drift (4) 5.3 Frequency(4) 5.4 Total Distortion Noise(5) 6 General technical requirements (5) 6.1 Submitting a trial(5) 6.2 Signs and information (5) 6.3 Appearance and structure (6) 7 Measuring Instrument Control(6) 7.1 Test conditions (6) 7.2 Verification items (7) 7.3 Verification method (7) 7.4 Processing of verification results (14) 7.5 Verification period(15) 7.6 In-use inspection (15) Appendix A Target Measurement Uncertainty (16) Appendix B Correction Values of Commonly Used Standard Microphones (18) Appendix C Test Certificate and Test Result Notification Inner Page Format (19) Appendix D Example of Assessment of Measurement Uncertainty (23)

Introduction

JJF1002 "Rules for Writing National Metrology Verification Regulations", JJF1001 "General Metrology Terms and Definitions" and JJF1059.1 "Assessment and Expression of Measurement Uncertainty" together constitute the basic series supporting the revision of this regulation document. This regulation refers to IEC 60942.2017 "Electroacoustics-Sound Calibrator" (Electroacoustics-Sound calibrators). This regulation replaces JJG 176-2005 "Sound Calibrator". Compared with JJG 176-2005, the main technical changes The transformation is to change the qualification judgment rule, which is defined by "the absolute value of the measured deviation, including the measurement uncertainty, shall not exceed the applicable "tolerance" and changed to "The absolute value of the measured deviation shall not exceed the applicable acceptance limit, and the actual measurement uncertainty shall be does not exceed the corresponding target measurement uncertainty". In addition, there are some major technical changes as follows. a) Added the terms "pistonphone" and "acceptance limit" and their definitions (see 3.1.2 and 3.1.12); b) The unit names and symbols of the main measurement characteristics are added (see 3.2); c) The description of the performance level of the sound calibrator is added (see 4.2, 4.3); d) Deleted the general requirements in the measurement performance requirements (see 5.1 of the.2005 edition); e) Changed the requirements for short-term class drift (see 5.2, 5.1.2 of the.2005 edition); f) The measurement characteristic "total distortion" is changed to "total distortion noise" (see 5.4, 5.4 of the.2005 edition); g) Delete the requirements for materials and structures (see 6.1 of the.2005 edition); h) Added the requirements for submitting tests (see 6.1); i) The requirements for the instructions for use have been changed (see 6.2.2, 6.2.3 of the.2005 edition); j) Changed the frequency range and error requirements of some measurement standards and supporting equipment (see 7.1.1,.2005 version 7.1.1); k) Changed the relative humidity conditions and environmental noise requirements in the verification environment conditions (see 7.1.2,.2005 version 7.1.3); l) The "appearance inspection" and "instruction manual" in the verification method were changed and merged into "general technical requirements" Seek" (see 7.3.1, 7.3.1 and 7.3.2 of the.2005 edition); m) The calculation formula of the measured value of the sound pressure level has been changed [see formula (1), formula (1) of the.2005 edition]; n) The measurement time of the sound pressure level has been changed [see 7.3.2.2b), item 1) in 7.3.3.1 of the.2005 edition]; o) The content about the relative humidity correction value of the sound calibrator is deleted [see the column in 7.3.3.1 of the.2005 edition Item 6)]; p) The test method for short-term level drift has been changed (see 7.3.3, 7.3.4 of the.2005 edition); q) Add specific requirements for numerical rounding off (see 7.4.1); r) Added the method of inspection in use and the report of inspection results (see 7.6); s) Changed the target measurement uncertainty of short-term drift in the low frequency band (see Table A.2,.2005 edition Table A.1); t) Changed the target measurement uncertainty of frequency (see Table A.3, A.2 of the.2005 edition); u) Changed the inner page format of the verification certificate and verification result notification (see Appendix C,.2005 edition Appendix B). The release status of previous versions of this regulation. ---JJG 176-2005; ---JJG 176-1995; ---JJG 176-1984; ---JJG 176-1976. Acoustic Calibrator Verification Regulations

1 Scope

This regulation is applicable to the initial verification and follow-up verification of LS (laboratory standard) class, class 1 and class 2 sound calibrator and check in use.

2 References

This procedure references the following documents. JJG 175 working standard microphone (electrostatic actuator method) JJG 790 Laboratory standard microphone (coupled cavity reciprocity method) JJG 1019 Working Standard Microphone (Coupling Cavity Comparison Method) JJF1001-2011 general measurement terms and definitions JJF1034-2020 Acoustic Metrology Terms and Definitions JJF1059.1-2012 Evaluation and Expression of Measurement Uncertainty GB/T 3102.7-1993 Acoustic quantities and units GB/T 15173-2010 Electroacoustic sound calibrator GB/T 20441.1-2010 Electroacoustic measurement microphones Part 1.Specifications for laboratory standard microphones ISO /IEC Guide 98-4.2012 Uncertainty of measurement The role of measurement uncertainty in conformity assessment ment) For dated references, only the dated version applies to this regulation; for undated references document, its latest version (including all amendments) applies to this regulation.

3 Terminology and units of measurement

3.1 Terms and Definitions The following terms and definitions defined in JJF1001-2011, JJF1034-2020 and JJF1059.1-2012 apply used in this procedure. 3.1.1 Sound calibrator soundcalibrator A sine wave that produces a specified sound pressure level and a specified frequency when coupled to a specified type of microphone in the specified configuration sound pressure device. [Source. IEC 60942.2017,3.1] 3.1.2 Pistonphone Acoustic calibration that produces sound pressure in a fixed volume of air by the movement of one or more pistons with known volume velocities quasi-device.

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