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JJG 340-2017: Standard Hydrophones in the Frequency Range 1 Hz to 2 kHz(Closed-chamber Comparison Method)
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
JJG 340-2017	English	369	Add to Cart	4 days [Need to translate]	Standard Hydrophones in the Frequency Range 1 Hz to 2 kHz(Closed-chamber Comparison Method)
JJG 340-1999	English	599	Add to Cart	3 days [Need to translate]	Verification Regulation of Measuring Hydrophone in the Frequency Range 1Hz to 1000Hz
JJG 340-1984	English	RFQ	ASK	3 days [Need to translate]	(Chinese Industry Standard)

JJG 340-2017: Standard Hydrophones in the Frequency Range 1 Hz to 2 kHz(Closed-chamber Comparison Method)

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(1Hz ~ 2kHz standard hydrophone test procedures (airtight chamber comparison method)) National Metrology Verification Regulations of the People's Republic 1Hz~2kHz standard hydrophone (closed cavity comparison method) Range1Hzto2kHz (Closed-chamberComparisonMethod) Released on.2017-11-20 2018-05-20 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued 1Hz~2kHz standard hydrophone (closed cavity comparison method) verification procedure 2kHz (Closed-chamberComparisonMethod) Replace JJG 340-1999 Focal Point. National Acoustic Metrology Technical Committee Main drafting unit. China Shipbuilding Industry Corporation Seventh Five-Year Research Institute Participated in drafting unit. China Testing Technology Research Institute Institute of Acoustics This procedure entrusts the National Acoustic Metrology Technical Committee to explain The main drafters of this procedure. Xu Zhuohua (Seventh Five-Year Research Institute of China Shipbuilding Industry Corporation) Chen Yi (Seventh Five-Year Research Institute of China Shipbuilding Industry Corporation) Participate in the drafters. Huang Yongjun (Seventh Five-Year Research Institute of China Shipbuilding Industry Corporation) Sun Lei (China Testing Technology Research Institute) Mo Xiping (Institute of Acoustics, Chinese Academy of Sciences)

table of Contents

Introduction (II) 1 Scope (1) 2 References (1) 3 terms and units of measurement (1) 3.1 Hydrophone (1) 3.2 Reference Standard Hydrophone (1) 3.3 Sound pressure sensitivity (1) 3.4 Sound pressure sensitivity level (1) 3.5 Alternative Comparison Method (2) 3.6 Simultaneous comparison method (2) 4 Overview (2) 5 Metrological performance requirements (2) 5.1 Sound pressure sensitivity level (2) 5.2 Sound pressure sensitivity level frequency response (2) 6 General technical requirements (2) 6.1 Appearance (2) 6.2 Marks and instructions (2) 6.3 Normal work (2) 7 Measuring instrument control (3) 7.1 Verification conditions (3) 7.2 Verification items and verification methods (3) 7.3 Processing of verification results (7) 7.4 Verification cycle (7) Appendix A Format of Internal Page of Verification Certificate and Verification Result Notice (8) Appendix B Design and Sound Field Inspection of Closed Cavity (10)

Introduction

This procedure is prepared in accordance with the rules given in JJF1002-2010 "Rules for the preparation of national metrological verification procedures", and Evaluate and express measurement uncertainty according to JJF1059.1-2012 "Measurement Uncertainty Evaluation and Representation" analysis. The verification method of this regulation adopts the national standard GB/T 4130-2000 "Audio hydrophone low frequency calibration method" The closed cavity comparison method. This procedure replaces JJG 340-1999 "1Hz ~ 1000Hz measuring hydrophone". With JJG 340-1999 The main technical changes are as follows. --- Expanded the frequency range of the verification object, from the original 1Hz ~ 1kHz to 1Hz ~ 2kHz; --- Added reference files; --- Added general technical requirements. The previous versions of this procedure are released. ---JJG 340-1999 "1Hz ~ 1000Hz measuring hydrophone"; ---JJG 340-1984 "Low-frequency measurement hydrophone trial". 1Hz~2kHz standard hydrophone (closed cavity comparison method) verification procedure

1 Scope

This procedure is applicable to standard hydrophones used in the frequency range of 1 Hz to 2 kHz. The first verification, subsequent verification and inspection in use.

2 reference files

This procedure refers to the following documents. JJG 449-2014 octave and fractional octave filter JJF1001-2011 General Measurement Terms and Definitions JJF1034-2005 Acoustic measurement terminology and definition GB/T 3102.7-1993 The amount and unit of acoustics GB/T 3947-1996 acoustic terminology GB/T 4130-2000 Acoustic hydrophone low frequency calibration method 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 relevant terms in JJF1001-2011, JJF1034-2005, GB/T 3947-1996 and definition. This procedure uses the quantities and units specified in GB/T 3102.7-1993. 3.1 hydrophone hydrophone An electroacoustic transducer for receiving a hydroacoustic signal. Note. due to different working principles, characteristics and construction, there are sound pressure, sound pressure gradient, undirected, pointed, piezoelectric, optical fiber, etc. Listener. [GB/T 3947-1996, definition 7.81] 3.2 reference standard hydrophone referencestandardhydrophone A stable, absolutely calibrated transducer for hydroacoustic metrology. Often used as a reference for establishing sound pressure in water The standard is used to pass the sound pressure value. 3.3 Sound pressure sensitivity pressuresensitivity The ratio of the open circuit voltage at the output of the receiving transducer to the actual sound pressure acting on the receiving surface of the transducer. Symbol. Mp. Unit. V/Pa. [JJF1034-2005, definition 3.63] 3.4 Sound pressure sensitivity level pressuresensitivitylevel The base 10 logarithm of the ratio of the magnitude of the sound pressure sensitivity to the reference value is multiplied by 20. ...