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JJG 185-2017: Standard Hydrophones in the Frequency Range 500 Hz to 1 MHz(Free-field Comparison Method)
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
JJG 185-2017	English	329	Add to Cart	3 days [Need to translate]	Standard Hydrophones in the Frequency Range 500 Hz to 1 MHz(Free-field Comparison Method)
JJG 185-2004	English	RFQ	ASK	3 days [Need to translate]	Locomotive speed meter testing procedures
JJG 185-1997	English	359	Add to Cart	3 days [Need to translate]	Verification Regulation of Measuring Hydrophone in the Frequency Range 500Hz to 1 MHz
JJG 185-1978	English	RFQ	ASK	3 days [Need to translate]	Verification Regulation of Standard Hydrophone (Grade II)

JJG 185-2017: Standard Hydrophones in the Frequency Range 500 Hz to 1 MHz(Free-field Comparison Method)

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(500Hz ~ 1MHz standard hydrophone test procedures (free field comparison method)) National Metrology Verification Regulations of the People's Republic 500Hz~1MHz standard hydrophone (free field comparison method) Range500Hzto1MHz (Free-fieldComparisonMethod) Released on.2017-11-20 2018-05-20 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued 500Hz~1MHz standard hydrophone (free field comparison method) verification procedure Replace JJG 185-1997 Focal Point. National Acoustic Metrology Technical Committee Drafted by. China Testing Technology Research Institute Institute of Acoustics China Shipbuilding Industry Corporation Seventh Five-Year Research Institute Shenzhen Institute of Metrology and Quality Inspection This procedure entrusts the National Acoustic Metrology Technical Committee to explain Drafters of this procedure. Sun Lei (China Testing Technology Research Institute) Mo Xiping (Institute of Acoustics, Chinese Academy of Sciences) Zhao Han (Seventh Five-Year Research Institute of China Shipbuilding Industry Corporation) Zhang Guoqing (Shenzhen Metrology and Quality Inspection Institute)

table of Contents

Introduction (II) 1 Scope (1) 2 References (1) 3 terms and units of measurement (1) 3.1 Hydrophone (1) 3.2 Standard hydrophone (1) 3.3 Free field sensitivity (1) 3.4 Free field sensitivity level (2) 3.5 Free field comparison method (2) 3.6 Electrical Transfer Impedance Mode (2) 3.7 Reference Center (2) 4 Overview (2) 5 Metrological performance requirements (2) 5.1 Free field sensitivity level (2) 5.2 Free field sensitivity level frequency response (2) 6 General technical requirements (3) 6.1 Appearance (3) 6.2 Marking and ex-factory information (3) 6.3 Normal work (3) 7 Measuring instrument control (3) 7.1 Verification conditions (3) 7.2 Verification project (4) 7.3 Verification method (5) 7.4 Processing of verification results (7) 7.5 Verification cycle (7) Appendix A Format of Internal Page of Verification Certificate and Verification Result Notice (8)

Introduction

This procedure is a revision of JJG 185-1997 "500Hz ~ 1MHz measuring hydrophone". The basis for this revision is the IEC 60565.2006 "Water Acoustic Hydrophone in the frequency range of 0.01 Hz to 1 MHz. calibration". Compared with JJG 185-1997, the main revisions are. --- The name of the procedure was changed to "500Hz~1MHz standard hydrophone (free field comparison method)"; --- The terms used are based on the terms and definitions in JJF1001-2011 General Terms and Definitions; ---Add reference files; --- Increase general technical requirements; --- Remove the sensitivity (response) level and sensitivity (response) conversion table. The previous versions of this procedure were released as follows. ---JJG 185-1997. 500Hz~1MHz standard hydrophone (free field comparison method) verification procedure

1 Scope

This procedure applies to the first verification and follow-up of standard hydrophones used in the frequency range of 500 Hz to 1 MHz. Verification and inspection in use.

2 reference files

This procedure refers to the following documents. 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 IEC 60565.2006 Hydroacoustic hydrophone calibration from 0.01 Hz to 1 MHz (Underwater) acoustics-Hydrophone-Calibrationinthefrequencyrange0.01Hzto1MHz) 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. Note. Unless otherwise stated, all voltage values in this specification refer to the effective value. 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 standard hydrophone standardhydrophone 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. [GB/T 3947-1996, definition 7.82] 3.3 Free field sensitivity free-fieldsensitivity Receiving the open circuit voltage at the output of the transducer, and presenting itself at the center of the transducer before the introduction of the transducer in the sound field The ratio of the sound pressure from the field. ...