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JJG 992-2004 English PDF

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US$709.00 · In stock
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JJG 992-2004: Verification Regulation of the Measurement Instruments of Sound Intensity
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 992-2004	709	Add to Cart	5 days	Verification Regulation of the Measurement Instruments of Sound Intensity	Valid

Similar standards

GB/T 3222.2 GB/T 3222.1 JJG 188 JJG 921 JJG 778 JJG 991

Basic data

Standard ID: JJG 992-2004 (JJG992-2004)
Description (Translated English): Verification Regulation of the Measurement Instruments of Sound Intensity
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A59
Classification of International Standard: 17.140
Word Count Estimation: 27,246
Date of Issue: 2004-09-21
Date of Implementation: 2004-12-21
Quoted Standard: 2004 technical regulations issued by national metrology (industrial measurement 2005 Volume 15, Issue 1)
Regulation (derived from): 2004 technical regulations issued by national metrology (industrial measurement 2005 Volume 15, Issue 1)
Issuing agency(ies): State Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to the use of sound pressure on a microphone, 2 and 2X level of sound intensity measuring instrument initial verification, testing and use of follow-up inspection.

JJG 992-2004: Verification Regulation of the Measurement Instruments of Sound Intensity

---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.
Verification Regulation of the Measurement Instruments of Sound Intensity National Metrology Verification Regulations of the People's Republic Sound intensity measuring instrument Released on.2004-09-21 Implementation of.2004-12-21 The General Administration of Quality Supervision, Inspection and Quarantine issued Sound intensity measuring instrument verification procedure This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 21,.2004, and Implemented on December 21,.2004. Focal Point. National Acoustic Metrology Technical Committee Drafting unit. Institute of Acoustics, Chinese Academy of Sciences Beijing Labor Protection Science Research Institute Oriental Vibration and Noise Technology Institute Hengyang Instrument Electric Equipment Co., Ltd. The Third Research Institute of China Electronics Technology Group Corporation This procedure entrusts the National Acoustic Metrology Technical Committee to explain Drafters of this procedure. Liu Ke (School of Acoustics, Chinese Academy of Sciences) Li Yimin (Institute of Oriental Vibration and Noise Technology) Ding Hui (Beijing Labor Protection Science Research Institute) Liu Xiangheng (Hengyang Instrument Electric Equipment Co., Ltd.) Pan Yuewu (The Third Institute of China Electronics Technology Group Corporation)

1 Scope (1) 2 Citations (1) 3 terms and units of measurement (1) 3.1 Sound pressure level (1) 3.2 Instantaneous sound intensity (1) 3.3 Sound intensity (1) 3.4 Sound intensity level (2) 3.5 Sound Intensity Probe (2) 3.6 Reference point of the probe (2) 3.7 Probe Shaft (2) 3.8 Reference direction (2) 3.9 Nominal spacing of probe microphones (2) 3.10 residual sound intensity (2) 3.11 Sound pressure - residual sound intensity index (2) 3.12 Dynamic Capability Index (3) 3.13 Scope of work (3) 3.14 Working in real time (3) 4 Overview (3) 5 Metrological performance requirements (3) 5.1 Frequency range (3) 5.2 Filtering (3) 5.3 A-weighting (4) 5.4 Time average (4) 5.5 Crest Factor Processing (5) 5.6 Sound pressure frequency response and sound intensity frequency response (5) 5.7 Sound pressure - residual sound intensity index (6) 6 General technical requirements (6) 6.1 Marking, nameplate and instruction manual (6) 6.2 Mark (7) 7 Measuring instrument control (7) 7.1 Verification conditions (7) 7.2 Verification project (8) 7.3 Verification method (8) 7.4 In-use inspection (10) 7.5 Processing of verification results (10) 7.6 Verification cycle (10) Appendix A Example of Uncertainty in Measurement Results (11) Appendix B Format of verification certificate and verification result page (16) Sound intensity measuring instrument verification procedure

1 Scope

This procedure is applicable to the first verification and follow-up of sound intensity microphones for Class 1, 2 and 2X sound intensity measuring instruments. Verification and in-use inspection.

2 Citations

This procedure refers to the following documents. GB/T 3102.7-1993 "Amount and unit of acoustics" GB/T 3241-1998 "octave and fractional octave filter" GB/T 16404-1996 - Determination of sound power levels of noise sources - Part 1 the amount" GB/T 16404.2-1999 "Acoustic power intensity method - Determination of sound power level of noise sources - Part 2. Scanning measurement" GB/T 17561-1998 "Sound pressure microphone with sound intensity measuring instrument for measurement" GB/T 6882-1986 "Determination of sound power levels of acoustic noise sources - anechoic chamber and semi-anechoic chamber precision method" JJG 176-1995 "Acoustic Calibrator Calibration Procedure" JJG 188-2002 "Sound Level Meter Verification Regulations" JJG 449-2001 "Vertical and 1/3 octave filter verification procedures" When using this procedure, care should be taken to use the current valid version of the above cited documents.

3 terms and units of measure

This procedure uses and references the definitions of terms in GB/T 16404 and GB/T 17561. This procedure uses the quantities and units specified in GB/T 3102.7. 3.1 Sound pressure level (soundpressurelevel) The ratio of the sound pressure to the reference sound pressure is 20 times the base 10 logarithm, the reference sound pressure is 20 μPa, and the sound pressure level is used. Bay indicates that the symbol is dB. 3.2 Instantaneous sound intensity (instantaneoussoundintensity) At a certain point in the sound field, the unit time passes through the sound energy per unit area perpendicular to the direction of the particle velocity. The instantaneous sound intensity at a point in the sound field is a vector equal to the product of the instantaneous sound pressure at that point and the instantaneous particle velocity. I(t)=p(t)·u(t) (1) Where. I(t)---instantaneous sound intensity, W/m2; p(t)---instantaneous sound pressure, Pa; u(t)--- Instantaneous particle velocity, m/s. 3.3 Sound intensity (soundintensity) The average value of the instantaneous sound intensity in a steady state sound field over a certain time T. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 992-2004_English be delivered?

Answer: Upon your order, we will start to translate JJG 992-2004_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJG 992-2004_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 992-2004_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.