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JJG 1175-2021 English PDF

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US$399.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 1175-2021: (Verification Regulations of 200Hz～5kHz Standard Hydrophone (Average Method of Complex Moving Weights))
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 1175-2021	399	Add to Cart	4 days	(Verification Regulations of 200Hz～5kHz Standard Hydrophone (Average Method of Complex Moving Weights))	Valid

Similar standards

GB/T 3222.2 GB/T 3222.1 JJG 188 JJG 1182 JJG 1183 JJF 1175

Basic data

Standard ID: JJG 1175-2021 (JJG1175-2021)
Description (Translated English): (Verification Regulations of 200Hz��5kHz Standard Hydrophone (Average Method of Complex Moving Weights))
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A59
Word Count Estimation: 20,219
Issuing agency(ies): State Administration for Market Regulation

JJG 1175-2021: (Verification Regulations of 200Hz～5kHz Standard Hydrophone (Average Method of Complex Moving Weights))

---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.
(Verification Regulations of.200Hz～5kHz Standard Hydrophone (Average Method of Complex Moving Weights)) People's Republic of China National Metrological Verification Regulations 200Hz~5kHz standard hydrophone (complex moving weight average method) Published on 2021-07-28 2022-01-28 Implementation Released by the State Administration for Market Regulation 200Hz~5kHz standard hydrophone (Complex Moving Weight Average Method) Verification Procedure AveragingMethod) Focal Point. National Acoustic Metrology Technical Committee Main drafting unit. The 715th Research Institute of China Shipbuilding Industry Corporation Institute of Acoustics, Chinese Academy of Sciences Participating in the drafting unit. CSIC Haisheng Technology Co., Ltd. This regulation is entrusted to the National Acoustic Metrology Technical Committee to be responsible for the interpretation The main drafters of this regulation. Ping Zihong (The 715th Research Institute of China Shipbuilding Industry Corporation) Zhao Han (715th Research Institute of China Shipbuilding Industry Corporation) Mo Xiping (Institute of Acoustics, Chinese Academy of Sciences) Participating drafters. Jia Guanghui (No.715 Research Institute of China Shipbuilding Industry Corporation) Song Shuping (CSIC Haisheng Technology Co., Ltd.)

content

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Terms and units of measurement(1) 4 Overview(2) 5 Measurement performance requirements (2) 5.1 Free-field sensitivity levels(2) 5.2 Frequency Response of Free Field Sensitivity Stage(2) 6 General technical requirements (2) 6.1 Appearance(2) 6.2 Marks and Factory Instructions(2) 6.3 Normal working (2) 7 Measuring Instrument Control(2) 7.1 Verification Conditions (2) 7.2 Verification items and verification methods (3) 7.3 Processing of Verification Results(10) 7.4 Verification period(10) Appendix A Format of Inner Pages of Verification Certificate and Verification Result Notification (11) Appendix B Complex Moving Weight Averaging (CMWA) (13)

Introduction

JJF1002-2010 "Rules for the Compilation of National Metrological Verification Regulations", JJF1001-2011 "General Metrology Terms and Definition" and JJF1059.1-2012 "Measurement Uncertainty Evaluation and Representation" together constitute support for the formulation of this regulation The basic series of specifications. The verification method of this regulation refers to GB/T 3223-1994 "Free Field Calibration Method of Acoustic Underwater Acoustic Transducer" The specified free-field calibration method. This regulation is based on JJF1002-2010 "Rules for the Compilation of National Metrological Verification Regulations" The rules given are compiled and evaluated and evaluated according to the requirements of JJF1059.1-2012 "Measurement Uncertainty Evaluation and Representation". Indicates measurement uncertainty. Compared with GB/T 3223-1994 and JJG 1017-2007, the main technical differences are as follows. --- Under the same sound field conditions, the lower limit of the test frequency is extended from 1kHz down to.200Hz; ---Added the content of testing hydrophone free-field sensitivity based on complex moving weight average method. This regulation is published for the first time. 200Hz~5kHz standard hydrophone (Complex Moving Weight Average Method) Verification Procedure

1 Scope

This regulation applies to standard hydrophones (using complex moving weights) used in the frequency range of.200Hz~5kHz. Average method) initial verification, subsequent verification and in-use inspection.

2 Reference documents

This procedure cites the following documents. JJG 449-2014 Octave and Fractional Octave Filters JJG 1017-2007 1kHz~1MHz standard hydrophone JJF1001 General Metrology Terms and Definitions JJF1034 Acoustic Metrology Terms and Definitions GB/T 3102.7 Acoustic Quantities and Units GB/T 3223-1994 Acoustic underwater acoustic transducer free field calibration method GB/T 3947 Acoustic terminology For dated citations, only the dated version applies to this Regulation; for undated citations The latest version (including all amendments) applies to this regulation.

3 Terminology and units of measurement

This regulation adopts the relevant terms and definitions in JJF1001, JJF1034 and GB/T 3947. This regulation adopts the quantity and unit specified in GB/T 3102.7. Taking the transmitting transducer-tank-receiving hydrophone as a system, the transmitting transducer is excited by a complex linear frequency sweep signal It is a method to analyze the transfer impedance of the system by using the weight average. Note. In the process of analyzing the transfer impedance, the analysis bandwidth is designed according to the propagation delay characteristics of the sound wave in different paths. The anti-function performs multiple weight averaging processing in different bandwidths to reduce the influence of reflected signals, so as to achieve low-frequency conditions. Obtain the direct sound signal. 3.2 free-field[soundpressure]sensitivity The open-circuit voltage at the output of the hydrophone is the same as the voltage that existed at the acoustic center of the hydrophone before it was introduced into the free-field sound field. Complex ratio of instantaneous voltages. Note. The unit is V/Pa. 3.3 free-field[soundpressure]sensitivitylevel The ratio of the magnitude of the free field sensitivity to the reference sensitivity is the base 10 logarithm multiplied by 20. Note. The unit is dB, and the reference value is 1V/μPa. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 1175-2021_English be delivered?

Answer: Upon your order, we will start to translate JJG 1175-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJG 1175-2021_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 1175-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.