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JJF 1468-2014: Calibration Specification for Omnidirectional Sound Sources
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Calibration Specification for Omnidirectional Sound Sources
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JJF 1468-2014
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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.
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