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JJF 1734-2018: Calibration Specification for Active Couplers
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JJF 1734-2018: Calibration Specification for Active Couplers

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Calibration Specification for Active Couplers National Metrology Technical Specification of the People's Republic Active Coupling Cavity Calibration Specification Published on.2018-12-25 2019-03-25 implementation State Market Supervisory Administration released Active Coupling Cavity Calibration Specification Focal Point. National Acoustic Metrology Technical Committee Drafting unit. Fujian Institute of Metrology China Institute of Metrology Shanghai Metrology and Testing Institute Guangzhou Institute of Metrology and Testing Technology Hangzhou Aihua Instrument Co., Ltd. This specification entrusts the National Acoustic Metrology Technical Committee to explain Drafters of this specification. Li Qun (Fujian Institute of Metrology) Niu Feng (China Institute of Metrology) Lin Xijian (Fujian Institute of Metrology) An Zhaoliang (Shanghai Metrology and Testing Institute) Zhou Changhua (Guangzhou Institute of Metrology and Measurement Technology) Xiong Wenbo (Hangzhou Aihua Instrument Co., Ltd.) He Longbiao (China Institute of Metrology)

table of Contents

Introduction (II) 1 Scope (1) 2 References (1) 3 Terms and units of measurement (1) 3.1 Coupling cavity (1) 3.2 Active Coupling Cavity (1) 3.3 Total distortion (1) 3.4 Working effective sound pressure level (1) 4 Overview (2) 5 Measurement characteristics (2) 5.1 total distortion (2) 5.2 Coupling end amplitude consistency (2) 5.3 Coupling phase consistency (2) 5.4 Working effective sound pressure level (2) 5.5 Short-term drift (2) 6 Calibration conditions (3) 6.1 Environmental conditions (3) 6.2 Measurement standards and other equipment (3) 7 Calibration items and calibration methods (3) 7.1 Calibration Project (3) 7.2 Calibration method (4) 8 Calibration result expression (7) 8.1 Calibration Record (7) 8.2 Calibration Data Processing (7) 8.3 Calibration Certificate (7) 8.4 Measurement uncertainty of calibration results (7) 9 re-study interval (7) Appendix A Contents of Calibration Record (8) Appendix B Contents of the calibration certificate (12) Appendix C Example of Measurement Uncertainty Evaluation (15)

Introduction

This specification is based on the rules and formats given in JJF 1071-2010 “Rules for the Preparation of National Metrology Calibration Specifications”. System, measurement uncertainty is assessed according to the requirements of JJF 1059.1-2012 "Evaluation and Representation of Measurement Uncertainty" Said. This specification is the first release. Active Coupling Cavity Calibration Specification

1 Scope

This specification is applicable to the calibration of the coupling cavity of the external audio signal generator with a frequency in the range of 10 Hz to 20 kHz.

2 reference files

This specification refers to the following documents. JJG176-2005 Acoustic Calibrator JJF 1001-2011 General Measurement Terms and Definitions JJF 1034-2005 Acoustic measurement terminology and definition JJF 1137-2005 Microphone Preamplifier Calibration Specification GB/T 2900.86-2009 Electrotechnical terminology acoustic and electroacoustic Common frequency in GB/T 3240 acoustic measurement GB/T 3947-1996 acoustic terminology GB/T 15173-2010 Electroacoustic Acoustic Calibrator IEC 61094-2.2009 Electroacoustic measuring microphones - Part 2. Reciprocal The basic method of pressure calibration by the microphone (ElectroacousticsmeasurementmicrophonesPart 2. Primarymethodforthepressurecalibrationoflaboratorystandardmicrophonesbythe Reciprocitytechnique) For dated references, only dated versions apply to this specification; undated quotations The latest version (including all amendments) applies to this specification.

3 terms and units of measure

JJF 1001-2011, JJF 1034-2005 and JJF 1059.1-2012 define the following terms and definitions Used in this specification. 3.1 Coupling cavity coupler A cavity that can be formed into a defined shape and size after the microphone is installed to provide acoustic coupling between the microphones Unit device. [IEC 61094-2.2009, definition 3.5] 3.2 Active coupling cavity activecoupler A coupling cavity that requires an external audio signal generator to be used in two microphone diaphragms when an external electrical signal is applied A device that produces a symmetrical sound field between them. 3.3 total distortion totaldistortion The percentage of the ratio of the rms value of all distortion components to the rms value of the entire signal. [GB/T 15173-2010, definition 3.9] 3.4 effective sound pressure level effectivesoundpressurelevel ...