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JJF 1954-2021 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.
JJF 1954-2021: Calibration Specification for Volume Sound Sources
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1954-2021	399	Add to Cart	4 days	Calibration Specification for Volume Sound Sources	Valid

Similar standards

GB/T 3222.1 JJF 1234 JJF 1396 JJF 1956 JJF 1957 JJF 1955

Basic data

Standard ID: JJF 1954-2021 (JJF1954-2021)
Description (Translated English): Calibration Specification for Volume Sound Sources
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A57
Word Count Estimation: 17,191
Issuing agency(ies): State Administration for Market Regulation

JJF 1954-2021: Calibration Specification for Volume Sound Sources

---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.
Calibration Specification for Volume Sound Sources National Metrology Technical Specification of the People's Republic of China Volume Sound Source Calibration Specification Published on 2021-12-28 2022-06-28 Implementation Released by the State Administration for Market Regulation Volume Sound Source Calibration Specification Focal Point. National Acoustic Metrology Technical Committee Drafting unit. China Institute of Metrology Wuxi Jixing Automotive Acoustic Parts Technology Co., Ltd. Beijing Prestige Sound Technology Co., Ltd. Aviation Industry Beijing Great Wall Metrology and Testing Technology Research Institute This specification is entrusted to the National Acoustic Metrology Technical Committee to be responsible for the interpretation Drafters of this specification. Niu Feng (China Institute of Metrology) Zheng Yunshan (China Institute of Metrology) Qin Chaoqi (China Institute of Metrology) Huang Wei (Wuxi Jixing Automotive Acoustic Components Technology Co., Ltd.) Wu Qunli (Beijing Prestige Sound and Electric Technology Co., Ltd.) Song Shaozhi (Beijing Prestige Sound Technology Co., Ltd.) Zhang Bingyi (Beijing Great Wall Metrology and Testing Technology Research Institute of Aviation Industry)

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Terms and units of measurement(1) 4 Overview(2) 5 Metrology Characteristics(2) 5.1 Sound power level(2) 5.2 Volume acceleration sensitivity(2) 6 Calibration Conditions(2) 6.1 Environmental conditions (2) 6.2 Measurement standards and other equipment(2) 7 Calibration items and calibration methods (3) 7.1 Calibration items(3) 7.2 Calibration method(3) 8 Expression of calibration results (5) 8.1 Calibration data processing(5) 8.2 Measurement uncertainty of calibration results(5) 8.3 Calibration certificate(5) 9 Recalibration interval(5) Appendix A Internal Page Format of Calibration Certificate(6) Appendix B Microphone Location Diagram (8) Appendix C Measurement Uncertainty Evaluation Example(9)

Introduction

This specification is compiled according to the rules given in JJF 1071-2010 "Rules for Compilation of National Metrology Calibration Specifications". This specification gives the measurement of sound power level according to JJF 1059.1-2012 "Measurement Uncertainty Evaluation and Representation" Example of the evaluation of uncertainty. This specification is published for the first time. Volume Sound Source Calibration Specification

1 Scope

This specification applies to the calibration of the acoustic performance of volume sound sources.

2 Reference documents

This specification references the following documents. JJG175 Working Standard Microphone (Electrostatic Exciter Method) JJG176 Acoustic Calibrator JJG277 standard sound source JJG449 Octave and Fractional Octave Filters JJF 1001 General Metrology Terms and Definitions JJF 1034 Acoustic Metrology Terms and Definitions JJF 1288 Calibration Specification for Multi-Channel Acoustic Analyzers GB/T 3102.7 Acoustic Quantities and Units GB/T 3785.1 Electroacoustic Sound Level Meter Part 1.Specification For dated references, only the dated version applies to this specification; for undated references The latest version (including all amendments) applies to this specification.

3 Terminology and units of measurement

This specification adopts the quantities and units specified in GB/T 3102.7. Terms and definitions defined in JJF 1001, JJF 1034 and JJG277 and the following apply to this specification. 3.1 volume acceleration volumeacceleration Qac The particle normal acceleration of the sound source sound hole is multiplied by the area of the sound hole. Note. The unit is cubic meters per second squared (m3/s2). 3.2 Sva The output voltage value of the volume sound source under the unit volume acceleration. 1 The voltage value is given by the voltage measured by the built-in sensor of the volume sound source. The internal sensor of the volume sound source may be a microphone, or Possibly an accelerometer. 2 The unit is volts squared per cubic meter [V/(m3/s2)]. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJF 1954-2021_English be delivered?

Answer: Upon your order, we will start to translate JJF 1954-2021_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 JJF 1954-2021_English with my colleagues?

Answer: Yes. The purchased PDF of JJF 1954-2021_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.