JJF 1468-2014 English PDF

US$399.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJF 1468-2014: Calibration Specification for Omnidirectional Sound Sources
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1468-2014	399	Add to Cart	3 days	Calibration Specification for Omnidirectional Sound Sources	Valid

Similar standards

GB/T 3222.2   GB/T 3222.1   JJG 188   JJG 1190   JJF 2012   JJF 1467   

Basic data

Standard ID: JJF 1468-2014 (JJF1468-2014)
Description (Translated English): Calibration Specification for Omnidirectional Sound Sources
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A59
Classification of International Standard: 17.140
Word Count Estimation: 17,179
Date of Issue: 6/15/2014
Date of Implementation: 9/15/2014
Quoted Standard: JJG 449-2001; JJF 1001-2011; JJF 1034-2005; GB 3102.5; GB 3102.7; GB/T 6882-2008
Adopted Standard: ISO 3382-1-2009, NEQ
Regulation (derived from): The State Administration of Quality Supervision, Inspection and Quarantine Notice No. 64 of 2014
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine
Summary: This Standard specifies the calibration of non-directional sound sources in areas such as architectural acoustics testing purposes.

JJF 1468-2014: Calibration Specification for Omnidirectional 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 Omnidirectional Sound Sources People's Republic of China National Metrology Technical Specifications Non-directional sound source calibration specification Issued on. 2014-06-15 2014-09-15 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Non-directional sound source calibration specification Focal point. the National Committee of the acoustic measurement technology Drafting units. China Testing Technology Research Institute Hangzhou Aihua Instrument Co., Ltd. Zhejiang Institute of Metrology Shenzhen Academy of Metrology and Quality Inspection This specification metering commissioned National Technical Committee is responsible for interpreting acoustics Drafters of this specification. E treatment group (China Testing Technology Research Institute) Sun Lei (China Testing Technology Research Institute) Qian Lijun (Hangzhou Aihua Instrument Co., Ltd.) Yao Lei (Zhejiang Institute of Metrology) Pu Zhiqiang (China Testing Technology Research Institute) Li Zhi (Shenzhen Academy of Metrology and Quality Inspection)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2. References (1) 3 terminology and units of measurement (1) Directivity factor of 3.1 (1) 3.2 directivity index (1) 4 Overview (1) 5 Metrological characteristics (1) 5.1 directivity index (1) Sound power level 5.2 rated power (2) 5.3 fluctuation band (2) 5.4 Input impedance (2) Calibration Condition 6 (2) 6.1 environmental conditions (2) 6.2 standards and other measuring equipment (2) 7 calibration items and calibration methods (3) 7.1 calibration items (3) 7.2 Calibration method (3) 8 calibration results expression (6) 8.1 Calibration Data Processing (6) 8.2 calibration certificate (6) 8.3 calibration measurement uncertainty (6) 9 Recalibration interval (6) Appendix A calibration certificate (7) Appendix B Measurement Uncertainty Example (9)

Introduction

Rules and norms of the grid based JJF 1071-2010 "national measurement calibration specifications write rules" given Style establishment. In the absence of non-directional sound source of national and international standards, this specification with reference to the national standards GB/T 6882-2008 "Determination of sound power levels of noise sources anechoic and semi-anechoic chamber using sound pressure Precision methods" GB/T 19889.4-2005 "Acoustics Measurement of sound insulation of building elements and buildings - Part 4. Airborne sound between rooms Unit measuring room acoustics sound argument 1. "2009 and the international standard ISO 3382-1" in situ measurements of sound insulation Score. Workspace "(Acoustics-Measurementofroomacousticparameters-Part 1. Per- formancespaces). This specification is the first release. Non-directional sound source calibration specification

1 Scope

This instruction applies to areas such as building acoustics test non-directional sound source used for calibration. 2. References This specification refers to the following documents. JJG449-2001 octave and 1/3 octave filters JJF 1001-2011 common measurement terms and definitions JJF 1034-2005 acoustic measurement terminology and definitions GB 3102.5 Quantities and units of electricity and magnetism GB 3102.7 Quantities and units of acoustics GB/T 6882-2008 Determination of sound pressure level noise power anechoic and semi-anechoic chamber Precision methods For dated references, only the dated edition applies to this specification; undated reference documents Member, the latest edition (including any amendments) applies to this specification.

3 terminology and units of measurement

JJF 1001-2011, JJF 1034-2005 and JJF 1059.1-2012 defined and following terms and definitions applicable Used in the present specification. This specification uses quantities and units GB 3102.5 and GB 3102.7 prescribed. Directivity factor of 3.1 (Rθ) directivityfactor A transmitting transducer frequency sound pressure square on its axis some distant point radiated with the same sound power, After the same acoustic frequency point source instead of the transducer at the same point on the pressure generated by the square of the ratio. Note. The definition refers to the distance where the surface is full of football divergent conditions. 3.2 directivity index (DI) directivityindex Directivity factor of the base 10 of 10 times the logarithm. Note. in decibels (dB).

4 Overview

Non-directional sound source means emits sound waves of the same magnitude in all directions for a class of the sound source, usually by multiple properties Substantially the same as a speaker. For sound insulation, auditorium acoustics, reverberation time and absorption coefficient or reflection coefficient measurement The amount of required acoustic sound pressure level emitted generally much larger than the background noise level of the room.

5 Metrological characteristics

5.1 directivity index Error directivity index generally does not exceed the range listed in Table 1 and Table 2. ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJF 1468-2014_English be delivered?

Answer: Upon your order, we will start to translate JJF 1468-2014_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJF 1468-2014_English with my colleagues?

Answer: Yes. The purchased PDF of JJF 1468-2014_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.