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JJF 1842-2020 English PDF

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JJF 1842-2020: Calibration Specification for Fixed Audiometric Equipment in Sound Field
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Standard similar to JJF 1842-2020

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Basic data

Standard ID JJF 1842-2020 (JJF1842-2020)
Description (Translated English) Calibration Specification for Fixed Audiometric Equipment in Sound Field
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A53
Classification of International Standard 17.100
Word Count Estimation 18,134
Date of Issue 2020-07-02
Date of Implementation 2021-01-02
Quoted Standard JJG 176; JJF 1001; JJF 1034; JJF 1059.1-2012; GB/T 3102.7; GB/T 3947-1996; GB/T 4854.7-2008; GB/T 7341.1-2010; GB/T 16296.2-2016
Regulation (derived from) Announcement No. 29 (2020) of the State Administration for Market Regulation
Issuing agency(ies) State Administration for Market Regulation
Summary This standard applies to the calibration of fixed sound field audiometry equipment (hereinafter referred to as audiometry equipment).

JJF 1842-2020: Calibration Specification for Fixed Audiometric Equipment in Sound Field

---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.
(Calibration Specification for Fixed Sound Field Audiometer) National Metrology Technical Specifications of the People's Republic of China Calibration specification for fixed sound field audiometry equipment 2020-07-02 released 2021-01-02 implementation Issued by the State Administration for Market Regulation Calibration specification for fixed sound field audiometry equipment Focal point. National Technical Committee of Acoustics Measurement Main drafting unit. Shanghai Institute of Metrology and Testing Technology China Institute of Metrology Institute of Otorhinolaryngology, Chinese People's Liberation Army General Hospital Participating in the drafting unit. Shaanxi Normal University Zhejiang Institute of Metrology Fujian Institute of Metrology Shenzhen Institute of Metrology and Quality Inspection This specification entrusts the National Acoustics Metrology Technical Committee to be responsible for interpretation The main drafters of this specification. Deng Zheng (Shanghai Institute of Metrology and Testing Technology) Zhong Bo (China Institute of Metrology) Ji Fei (Institute of Otorhinolaryngology, Chinese People's Liberation Army General Hospital) Participating drafters. Wu Shengju (Shaanxi Normal University) Yao Lei (Zhejiang Institute of Metrology) Li Qun (Fujian Institute of Metrology) Zhang Guoqing (Shenzhen Institute of Metrology and Quality Inspection)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Terms and measurement units (1) 3.1 Howl (1) 3.2 Reference points (1) 3.3 Fixed sound field audiometry equipment (1) 4 Overview (2) 5 Measurement characteristics (2) 5.1 Sound pressure level error of sound field audiometry signal (2) 5.2 Harmonic distortion(2) 5.3 Linear error of sound field audiometry signal level (2) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Measurement standards and other equipment (2) 7 Calibration items and calibration methods (3) 7.1 Calibration items (3) 7.2 Calibration method (3) 8 Calibration result expression (5) 8.1 Calibration data processing (5) 8.2 Calibration certificate (5) 8.3 Evaluation of Uncertainty of Calibration Results (5) 9 Recalibration interval (5) Appendix A Reference threshold sound pressure levels for free field and diffuse field audiometry (6) Appendix B. Contents and recommended format of calibration certificate (7) Appendix C Examples of Uncertainty Evaluation (11)

Introduction

JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1001-2011 "General Metrology Terms and Definitions "Evaluation and Representation of Measurement Uncertainty" and JJF 1059.1-2012 "Measurement Uncertainty Evaluation and Expression" together constitute the basis for supporting the formulation of this specification. Basic series of specifications. This specification refers to the national standard GB/T 4854.7-2008 "Acoustic Calibration Audiometry Reference Level Zero for Preparation Part 7.Reference Threshold for Free Field and Diffusion Field Audiometry, GB/T 16296.2-2016 "Sound Learn Audiometry Method Part 2.Sound Field Audiometry with Pure Tone and Narrowband Test Signals and National Metrological Verification Regulations JJG388-2012 "Pure tone audiometer for audiometry equipment". This specification is released for the first time. Calibration specification for fixed sound field audiometry equipment

1 Scope

This specification applies to the calibration of fixed sound field audiometry equipment (hereinafter referred to as audiometry equipment).

2 Reference documents

This specification refers to the following documents. JJG176 Sound Calibrator JJF 1001 General measurement terms and definitions JJF 1034 Acoustic Metrology Terms and Definitions JJF 1059.1-2012 Measurement Uncertainty Evaluation and Expression GB/T 3102.7 Acoustic quantities and units GB/T 3947-1996 Acoustic terms GB/T 4854.7-2008 Acoustic calibration of the reference zero level of audiometry equipment-Part 7.Reference threshold of free field and diffuse field audiometry GB/T 7341.1-2010 Electroacoustic Audiometry Equipment Part 1.Pure Tone Audiometer GB/T 16296.2-2016 Acoustic audiometry method Part 2.Sound field audiometry with pure tone and narrowband test signals For dated reference documents, only the dated version applies to this specification; for undated reference documents, The latest version (including all amendments) is applicable to this specification.

3 Terms and units of measurement

This specification adopts the quantities and units specified in GB/T 3102.7. JJG176, JJF 1001, JJF 1034, JJF 1059.1, GB/T 3947-1996, GB/T 4854.7- The following terms and definitions defined in.2008, GB/T 7341.1-2010 and GB/T 16296.2-2016 apply to this code. 3.1 Howl A pure tone whose frequency is sinusoidally modulated. Note. Rewrite GB/T 3947-1996, definition 12.10. 3.2 Reference points The center position of the subject's head (the midpoint of the connection between the center of the external auditory meatus of the two ears) during sound field audiometry is located on the reference axis of the sounding speaker of the audiometry equipment. Note. Rewrite GB/T 16296.2-2016, definition 3.3. 3.3 Fixed sound field audiometry equipment Hearing equipment for sound field listening of subjects in the listening room, consisting of one or more speakers fixedly placed in the listening room And the signal source, power amplifier, signal level controller and other components placed outside the listening room.

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