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JJF 1228-2009 English PDF

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JJF 1228-2009: Calibration Specification for Sound Power Meters
Status: Valid

JJF 1228: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJF 1228-2009English579 Add to Cart 5 days [Need to translate] Calibration Specification for Sound Power Meters Valid JJF 1228-2009
JJF 1228-1990English279 Add to Cart 3 days [Need to translate] Operating Technical Norm for Gas Flow Primary Standard in the Range from 30 to 120 m3/h Obsolete JJF 1228-1990

PDF similar to JJF 1228-2009


Standard similar to JJF 1228-2009

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Basic data

Standard ID JJF 1228-2009 (JJF1228-2009)
Description (Translated English) Calibration Specification for Sound Power Meters
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A59
Classification of International Standard 17.140
Word Count Estimation 25,228
Date of Issue 2009-07-10
Date of Implementation 2009-10-10
Quoted Standard GB/T 3120.7-1993; GB/T 4129-2003; GB/T 6882-2008; JJF 1001-1998; JJF 1034-2005; JJF 1059-1999; JJG 176-2005; JJG 188-2002; JJG 499-2001
Regulation (derived from) AQSIQ Announcement No. 78 of 2009
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine
Summary This standard applies to the surface by measuring the surface of a known sound pressure level and surface area measurements are translated into sound power level sound power meter calibration.

JJF 1228-2009: Calibration Specification for Sound Power Meters

---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 Sound Power Meters People's Republic of China National Metrology Technical Specifications Sound power meter calibration specification Posted 2009-07-10 2009-10-10 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Sound power meter calibration specification JJF 1228 2009 This specification by the State Administration of Quality Supervision, Inspection and Quarantine July 10, 2009 for approval and self From October 10, 2009 into effect. Focal point. the National Committee of the acoustic measurement technology The main drafting units. China Testing Technology Research Institute Participated in the drafting. Shenzhen Academy of Metrology and Quality Inspection This specification by the responsible National Technical Committee acoustic measurement interpretation The main drafters of this specification. Pu Zhiqiang (China Testing Technology Research Institute) Sun Lei (China Testing Technology Research Institute) Drafters participate. Cai Weiping (Shenzhen Academy of Metrology and Quality Inspection)

table of Contents

1 Scope (1) 2. Referenced Documents (1) 3 terminology and units of measurement (1) 4 Overview (1) 5 Metrological characteristics (2) Sensitivity of the machine to change the amount of 5.1 (2) 5.2 filter characteristic (2) 5.3 Frequency weighting (3) 5.4 Linear (4) 5.5 measuring surface area and background noise correction verification (4) 5.6 average calculation verification (4) 5.7 Crosstalk (4) 5.8 RMS Features (4) 6 calibration conditions (5) Environmental conditions 6.1 (5) 6.2 Standard device and other measuring equipment (5) 7 calibration items and calibration methods (6) 7.1 calibration items (6) 7.2 Calibration method (6) 8 calibration results expression (10) 8.1 Calibration data processing (10) 8.2 calibration certificate (10) 8.3 calibration measurement uncertainty (10) 9 Recalibration interval (10) Appendix A calibration certificate (11) Appendix B Uncertainty Evaluation Examples (14) Sound power meter calibration specification

1 Scope

This standard applies to the measurement surface by a known sound pressure level and measuring the surface area on the surface in terms of sound power level Acoustic power meter calibration.

2 Citations

This specification references the following documents. GB/T 3102.7-1993 Quantities and units of acoustics Performance and calibration of GB/T 4129-2003 Acoustics Determination of sound power levels for standard sound source requirements Determination of sound power levels of noise sources anechoic and semi-anechoic chamber Precision method GB/T 6882-2008 Acoustics sound pressure JJF 1001-1998 common measurement terms and definitions JJF 1034-2005 acoustic measurement terminology and definitions JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement JJG176-2005 sound calibrators JJG188-2002 Sound Level Meter JJG449-2001 octave and 1/3 octave filters When using this specification it should be noted that using the currently valid version of the documents cited.

3 terminology and units of measurement

This specification uses quantities and units GB/T 3102.7-1993 prescribed. This specification uses JJF 1001-1998, and the following terms and definitions relating to the JJF 1034-2005. 3.1 surface sound pressure level Lp surfacesoundpressurelevelLp Microphone positions on the measurement surface of all, by the time the background noise corrected average sound pressure level of the average energy. 3.2 Measuring surface S measurementsurface Area S, and surround sound source arranged on top of it imaginary surface measuring point.

4 Overview

Sound power meter from the microphone, preamp, range control, amplify, filter, A-weighted, RMS detector, A/D conversion, computing, control and display components. Sound power meter by measuring surface sound source into account the average sound pressure level Operators obtain sound power levels of noise sources. Calculated as follows. LW = Lp 10lg (SS0) C (1) Where. LW --- sound power level of the sound source, dB (reference value 1pW); Measuring surface sound pressure level Lp --- sphere, dB (reference value 20μPa);

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