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JJG 798-2017: Mechanical Couplers for Measurement of Bone Vibrators
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
JJG 798-2017	English	419	Add to Cart	4 days [Need to translate]	Mechanical Couplers for Measurement of Bone Vibrators
JJG 798-1992	English	359	Add to Cart	3 days [Need to translate]	Verification Regulation of Standard artificial mastoids

JJG 798-2017: Mechanical Couplers for Measurement of Bone Vibrators

---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.
(Bone oscillator measurement force coupler verification procedures) National Metrology Verification Regulations of the People's Republic Bone vibration measuring force coupler Released on.2017-11-20 2018-05-20 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Replace JJG 798-1992 Focal Point. National Acoustic Metrology Technical Committee Main drafting unit. China Institute of Metrology Participated in drafting unit. Shanghai Institute of Metrology and Testing Technology Chinese People's Liberation Army Medical Acoustics Measurement and Research Station This procedure entrusts the National Acoustic Metrology Technical Committee to explain The main drafters of this procedure. Zhong Bo (China Institute of Metrology) Cai Chenguang (China Institute of Metrology) Participate in the drafters. Deng Wei (Shanghai Institute of Metrology and Testing Technology) Qi Fei (People's Liberation Army Medical Acoustics Measurement and Research Station) Feng Xiujuan (China Institute of Metrology)

table of Contents

Introduction (II) 1 Scope (1) 2 References (1) 3 terms and units of measurement (1) 3.1 Bone vibration device (1) 3.2 Force Coupler (1) 3.3 alternating vibration force level (1) 3.4 Force Impedance (2) 3.5 force impedance level (2) 3.6 Force sensitivity (2) 3.7 Force sensitivity level (2) 4 Overview (2) 5 Metrological performance requirements (2) 5.1 Force Impedance Level (2) 5.2 Force impedance phase angle (3) 5.3 Force sensitivity level (3) 6 General technical requirements (3) 6.1 Appearance (3) 6.2 Marks (3) 7 Measuring instrument control (3) 7.1 Verification conditions (4) 7.2 Verification project (4) 7.3 Verification method (5) 7.4 Processing of verification results (8) 7.5 Verification cycle (8) Appendix A Format of Internal Page of Verification Certificate and Verification Result Notice (9)

Introduction

This procedure is prepared in accordance with the requirements and format of JJF1002-2010 "Rules for the preparation of national metrological verification procedures", and According to JJF1059.1-2012 "Measurement Uncertainty Evaluation and Representation", the measurement uncertainty of the verification results is evaluated. This procedure mainly refers to IEC 60318-6.2007 Electroacoustic head and ear simulators Part 6. Bone vibration Force measuring coupler (Electroacoustics-Simulatorsofhumanheadandear-Part 6.Me- Mechanicalcouplerforthemeasurementofbonevibrators), for JJG 798-1992 Standard Simulation The mastoid was revised. Compared with JJG 798-1992, the main technical changes except editorial changes are as follows. --- Change the "standard simulated mastoid" to "bone oscillator measurement force coupler". --- Added "terms and units of measurement". --- Modified metering performance requirements. increased the two indicators of force impedance level and force impedance phase angle and their tolerances. ---In the "Metrics and main supporting equipment", replace the "measurement amplifier" with the "acoustic analyzer"; A charge amplifier and an LCR impedance meter have been added. --- In the "validation method", the verification method of the force impedance level and the force impedance phase angle is added. ---Modified the format of the page in the verification certificate/verification result notice. The previous versions of this procedure are released. ---JJG 798-1992. Bone vibrometer measurement force coupler verification procedure

1 Scope

This procedure applies to the first verification, subsequent verification and in-use inspection of the force coupler for bone vibrometer measurement.

2 reference files

This procedure refers to the following documents. JJG 338-2013 Charge Amplifier JJF1001-2011 General Measurement Terms and Definitions JJF1034-2005 Acoustic measurement terminology and definition GB/T 3102.7 Acoustics and units GB/T 3947 acoustic terminology GB/T 15951-1995 Bone vibration measuring force coupler Electroacoustic head and ear simulators - Part 6. Force coupling Electroacoustics-Simulatorsofhumanheadandear-Part 6.Mechanicalcoupler Forthemeasurementofbonevibrators) For dated references, only the dated version applies to this Code; any undated quotation The latest version (including all amendments) applies to this procedure.

3 terms and units of measure

This procedure uses the quantities and units specified in GB/T 3102.7. JJF1001-2011, JJF1034-2005 and GB/T 3947 define the following terms and definitions for this Procedure. 3.1 bone vibrator bonevibrator The electrical oscillation signal can be converted into mechanical vibration and can be coupled to the skull structure of the human head (usually with milk) Electromechanical transducers. [IEC 60318-6.2007, Definition 3.1] 3.2 Force coupler mechanicalcoupler A device capable of calibrating a bone vibrator that provides a gauge when coupled to a bone vibrator under conditions of a loaded static force Fixed force impedance. Its internal electromechanical transducer measures the alternating vibrational force between the bone vibrator and the force coupler contact surface. [IEC 60318-6.2007, definition 3.2] Note. It can also be called artificialmastoid. 3.3 alternating vibration force level alternatingforcelevel The square of the effective value of the alternating vibration force is divided by the square of the reference value (1μN), and the logarithm of the base 10 is used. ...