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GB/T 6881.2-2017 English PDF

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Q: Should I purchase the latest version GB/T 6881.2-2017?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 6881.2-2017 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$599.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 6881.2-2017: Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Engineering methods for small movable sources in reverberant fields -- Part 1: Comparison method for a hard-walled test room
Status: Valid

GB/T 6881.2: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 6881.2-2017	599	Add to Cart	4 days	Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Engineering methods for small movable sources in reverberant fields -- Part 1: Comparison method for a hard-walled test room	Valid
GB/T 6881.2-2002	639	Add to Cart	3 days	Acoustics -- Determination of sound power levels of noise sources -- Engineering methods for small, movable sources in reverberant field -- Part 1: Comparison method for hard-walled test rooms	Obsolete

Similar standards

GB/T 3222.2 GB/T 6882 GB/T 4854.7 GB/T 3241.2 GB/T 6881

Basic data

Standard ID: GB/T 6881.2-2017 (GB/T6881.2-2017)
Description (Translated English): Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Engineering methods for small movable sources in reverberant fields -- Part 1: Comparison method for a hard-walled test room
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A59
Classification of International Standard: 17.140
Word Count Estimation: 30,357
Date of Issue: 2017-11-01
Date of Implementation: 2018-05-01
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 6881.2-2017: Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Engineering methods for small movable sources in reverberant fields -- Part 1: Comparison method for a hard-walled test room

---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.
Acoustics-Determination of sound power levels and sound energy levels of noise sources using sound pressure-Engineering methods for small movable sources in reverberant fields-Comparison method for a hard-walled test room ICS 17.140 A59 National Standards of People's Republic of China Replacing GB/T 6881.2-2002 Acoustics sound pressure measurement of sound power level and noise source Sound energy level reverberation field small mobile Sound source engineering hard wall test room comparison method (ISO 3743-1.2010, Acoustics-Determinationofsoundpower levels and methodsforsmalmovablesourcesinreverberantfields-Part 1.Comparison methodforahard-waledtestroom, IDT) 2017-11-01 Release.2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Preface Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms and definitions 2 4 test room and measured sound source size 4 5 instruments and measuring equipment 6 6 Definition, location, installation and operation of the sound source under test 6 7 measurement method 8 Determination of sound power levels and sound energy levels Uncertainty of measurement 12 Data record 15 11 Test Report 16 Appendix A (Normative) Sound power levels and sound energy levels under standard meteorological conditions 17 Appendix B (normative) with the octave band sound power level and sound energy level calculation A weighted sound power level and sound energy level 18 Appendix C (Informative) Measurement Uncertainty Information Guide 19 References 26

Foreword

GB/T 6881 "Acoustics sound pressure method to determine the noise source sound power level and sound energy level" consists of the following 3 parts. --- GB/T 6881.1 Reverberation chamber precision method; --- GB/T 6881.2 small movable sound source reverberation field hard wall test room comparison method; --- GB/T 6881.3 reverb yard small movable sound source method dedicated reverberation test room method. This section GB/T 6881 Part 2. This section drafted in accordance with GB/T 1.1-2009 given rules. This Part replaces GB/T 6881.2-2002 "Acoustics sound pressure method for the determination of noise source sound power level reverberant small medium-sized movable sound source Engineering Law Part 1. Hard wall test room comparison method ", and GB/T 6881.2-2002 compared to the main technical content changes are as follows. --- Added some terms and definitions (see Chapter 3); --- Increased sound energy level measurement methods (see 8.2); --- Refine the content of measurement uncertainty, add the corresponding appendix (see Chapter 9 and Appendix C); --- Refined benchmarks set requirements (see 4.1 and 4.2); --- Increase the standard sound source and other equipment calibration requirements (see 5.2); --- Added meteorological conditions related to the amendment (see Appendix A); --- Added A-weighted sound energy level calculation (see Appendix B). This section uses the translation method identical with ISO 3743-1.2010 "Acoustics sound pressure method for the determination of sound power level and sound energy level Small movable sound reverb site - Part 1. Hardwall test room comparison method ". The documents of our country that are consistent with the corresponding international documents that are normative references in this section are as follows. Acoustics - Performance and calibration requirements of standard sound sources for the determination of sound power levels (ISO 6926-1). 1999, IDT); --- GB/T 6379 (all parts) Accuracy of measurement methods and results (accuracy and precision) [ISO 5725 Minute)]. This section is proposed by the Chinese Academy of Sciences. This part of the National Acoustic Standardization Technical Committee (SAC/TC17) centralized. This section is responsible for the drafting unit.Zhejiang University, Chinese Academy of Sciences Institute of Acoustics, Shenzhen Zhongya Electrical and Mechanical Industry Co., Ltd., Tongji University, Beijing Institute of Labor Protection, China Institute of Metrology, Anhui Vocational and Technical College, Hefei University of Technology. The main drafters of this section. Zhai Guoqing, Li Zhenguang, Cheng Mingkun, Lu Yadong, Tian Jing, Fang Qingchuan, Yu Wuzhou, Mao Dongxing, Lee Hyo Kwan, He Long standard, Bao Junyao, Li Zhiyuan, Xu Xin, Yin 铫. This part replaces the standards previously issued as. --- GB/T 6881.2-2002.

Introduction

This section corresponds to ISO 3740 [15] ~ ISO 3747 [21] GB/T 6881.1, GB/T 6881.2, GB/T 6881.3, GB/T 3767, GB/T 3768 and GB/T 16538 series of one of the standards. This series of standards specifies the identification of machines, equipment and their components The various methods of sound power level and sound energy level. According to the test to determine the sound power level or sound energy level and the choice of test equipment Test Methods. GB/T 14367 [6] provides a general guide to the choice of method. GB/T 14367 [6], GB/T 6881.1 [3], Only GB/T 6881.3 [4], GB/T 3767 [1], GB/T 6882 [5], GB/T 3768 [2] and GB/T 16538 [10] General principles for the operation and installation of machines and equipment. It is necessary to establish test specifications for various types of sound sources in order to provide information on installation, Load and operating conditions of the detailed requirements, get the conditions of sound power level or sound energy level. GB/T 6881 This section gives the method is based on the measured noise source octave sound pressure level and calibration of the standard frequency doubler Cheng sound pressure level comparison. The A-weighted sound power level or sound energy level can be calculated from the octave sound pressure level. This method applies to have a certain Acoustic properties of small portable test equipment in the lab. Depending on the nature of the noise emitted by the source, the measured noise can be measured in the test chamber Source sound power level or sound energy level. Due to the way in which they are operated and installed, this type of test chamber is not suitable for large fixed equipment. In GB/T 16538 [10] describes how to use this method in the field to determine the sound power or acoustic energy level of a device or machine. The method specified in this part of IEC 60388 allows the determination of the sound power level for each band and/or A-weighted sound power level. The method given in this part of ISO 9001 GB/T 6881 meets Level 2 accuracy (Engineering level) as defined in ISO /Request more accurate Degree, can refer to the appropriate part of GB/T 14367 [6] or GB/T 16404 [7] [9]. If you do not meet the relevant standards GB/T 6881 in this section Then the other standard GB/T 6881 series or the appropriate part of GB/T 16404 [7] [9] may be used. Acoustics sound pressure measurement of sound power level and noise source Sound energy level reverberation field small mobile Sound source engineering hard wall test room comparison method

1 Scope

1.1 Overview This section GB/T 6881 specifies the noise source sound power level or sound energy level method. The method by measuring and comparing safety The sound pressure level emitted by the sound source under test (machine or equipment) and the calibrated standard sound source in a hardwall test chamber of the specified characteristics is measured from the measured The sound pressure level of the sound source is calculated as the octave sound power level of the sound source (or as a burst sound or sound energy level in the case of transient noise). A weighted sound power level Or A-weighted sound energy level is calculated from octave band sound level. 1.2 noise and noise source type This section applies to GB/T 19052-2003 defined in the various types of noise (steady-state, non-steady-state, ups and downs, Burst sound, etc.). The sound source under test can be a device, a machine, a component or an accessory. The maximum size of the sound source to be measured is related to the size of the room used for acoustic measurements (See 4.2). 1.3 test environment This part of the measurement environment is a hard wall test chamber with specified acoustic characteristics. 1.4 Measurement Uncertainty This section gives the octave band and A-weighted sound power level, the sound energy level of uncertainty. Uncertainty in line with GB/T 19052- 2003 level 2 accuracy (engineering level) requirements.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. Electroacoustics Octave and Fractional Octave Filters (IEC 61260.1995, IDT) GB/T 3241-2010 GB/T 3785.1-2010 Electroacoustic sound level meter Part 1. Specification (IEC 61672-1.2002, IDT) GB/T 15173-2010 Electroacoustic sound calibrator (IEC 60942.2003, IDT) GB/T 19052-2003 acoustic machinery and equipment emitted noise and noise testing specifications drafting and presentation (ISO 12001.1996, IDT) ISO 5725 (all parts) Accuracy (accuracy and precision) of measurement methods and results [Accuracy (trueness and pre- cision) ofmeasurementmethodsandresults] ISO 6926 Acoustics Performance and calibration requirements for standard sound sources for sound power level determination (Acoustics-Requirements fortheperformanceandcalibrationofreferencesoundsforthedeterminationofsoundpower levels Uncertainty of measurement of ISO /IEC Guide98-3 - Part 3. Guidelines for the expression of uncertainty in measurement [Uncertaintyof ......

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Question 1: How long will the true-PDF of GB/T 6881.2-2017_English be delivered?

Answer: Upon your order, we will start to translate GB/T 6881.2-2017_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 6881.2-2017_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 6881.2-2017_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.

Question 5: Should I purchase the latest version GB/T 6881.2-2017?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 6881.2-2017 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.