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JJF 1147-2006

JJF 1147-2006_English: PDF (JJF1147-2006)
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JJF 1147-2006English529 Add to Cart 4 days Calibration specfication for acoustic performance of anechoic rooms and hemi-anechoic rooms JJF 1147-2006 Valid JJF 1147-2006

BASIC DATA
Standard ID JJF 1147-2006 (JJF1147-2006)
Description (Translated English) Calibration specfication for acoustic performance of anechoic rooms and hemi-anechoic rooms
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A59
Word Count Estimation 22,240
Date of Issue 2006-05-23
Date of Implementation 2006-08-23
Quoted Standard JJF 1001-1998; JJF 1059-1999; JJG 176-2005; JJG 449-2001; GB/T 3102.7-1993; GB/T 3947-1996; GB/T 17247.1-2000; ISO 3745-2003; IEC 61094-4 -1995
Drafting Organization China measure Scientific Academy
Administrative Organization National Technical Committee on Acoustic Measurement
Issuing agency(ies) State Administration of Quality Supervision, Inspection and Quarantine
Summary This standard applies to anechoic and semi-anechoic chamber acoustic characteristics to identify and evaluate.

JJF 1147-2006
Calibration specfication for acoustic performance of anechoic rooms and hemi-anechoic rooms
National Metrology Technical Specification of the People's Republic
Calibration specifications for acoustic characteristics of anechoic chambers and semi-anechoic chambers
Released on.2006-05-23
Implementation of.2006-08-23
The General Administration of Quality Supervision, Inspection and Quarantine issued
Anechoic chamber and semi-anechoic chamber
Acoustic characteristic calibration specification
This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine on May 23,.2006, and
Implemented on August 23,.2006.
Focal Point. National Acoustic Metrology Technical Committee
Drafted by. China Institute of Metrology
Institute of Acoustics
Shanghai Institute of Metrology and Testing Technology
This specification is interpreted by the National Acoustic Metrology Technical Committee.
Drafters of this specification.
Zhang Meizhen (China Institute of Metrology)
Chen Jianlin (China Institute of Metrology)
Liu Ke (School of Acoustics, Chinese Academy of Sciences)
Gu Jianxiu (Shanghai Institute of Metrology and Testing Technology)
Zheng Xiaotong (China Institute of Metrology)
Shuai Zhengping (China Institute of Metrology)
Bai Hao (China Institute of Metrology)
table of Contents
1 range (1)
2 Citations (1)
3 terms and units of measurement (1)
4 Overview (1)
5 Measurement characteristics (1)
5.1 Frequency range and spatial range of free sound field (1)
5.2 Noise floor (2)
6 Calibration conditions (2)
6.1 Environmental conditions (2)
6.2 Calibrators and other equipment (2)
7 Calibration items and calibration methods (3)
7.1 Calibration Project (3)
7.2 Calibration method (4)
8 Calibration result expression (8)
8.1 Calibration Data Processing (8)
8.2 Calibration Certificate (8)
8.3 Evaluation of uncertainty of calibration results (8)
9 re-study interval (8)
Appendix A Test Sound Source Selection and Directivity Measurement (9)
Appendix B Calculation of Acoustic Absorption by Air (10)
Appendix C Contents of the calibration certificate (12)
Appendix D Example of Evaluation of Uncertainty of Calibration Results (14)
Calibration specifications for acoustic characteristics of anechoic chambers and semi-anechoic chambers
1 Scope
This specification applies to the determination and evaluation of the acoustic characteristics of the anechoic chamber and the semi-anechoic chamber.
2 Citations
This specification refers to the following documents
JJF 1001-1998 General Terms and Definitions
JJF 1059-1999 "Measurement Uncertainty Evaluation and Representation"
JJG176-2005 "Acoustic Calibrator"
JJG449-2001 "octave and 1/3 octave filter"
GB/T 3102.7-1993 "Amount and unit of acoustics"
GB/T 3947-1996 "Acoustic terminology"
GB/T 17247.1-2000 "Attenuation of outdoor propagation - Part 1. Calculation of atmospheric sound absorption"
ISO 3745-2003 Acoustics-Determinationofsoundpowerlevelsofnoisesourcesus-
ingsoundpressure-Precisionmethodsforanechoicandhemi-an-
Echoicrooms
IEC 61094-4.1995 Measurementmicrophones-Part 4.Specificationsforworking
Standardmicrophones
Use of this specification should be done with the current valid version of the above cited documents.
3 terms and units of measure
This specification adopts the relevant terms and definitions in GB/T 3947-1996 and JJF 1001-1998 and GB/T.
The quantities and units specified in 3102.7-1993.
4 Overview
The anechoic chamber is equipped with high-efficiency sound absorbing materials or sound absorbing members on all sides of the room, so that the boundary can effectively absorb the incident sound.
A room in which the indoor space is basically a free sound field; the semi-anechoic chamber is an anechoic chamber with a reflecting surface on one side,
Quasi-half free field space, that is, a space above the reflecting surface that is a free sound field. Attenuation chambers and semi-anechoic chambers are widely used
Measurement of acoustic performance of various