GB/T 6881.3-2002 English PDF

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GB/T 6881.3-2002: Acoustics -- Determination of sound power levels of noise sources-using sound pressure -- Engineering methods for small, movable sources in reverberant fields -- Part 2: Methods for special reverberation test rooms
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 6881.3-2002	504	Add to Cart	4 days	Acoustics -- Determination of sound power levels of noise sources-using sound pressure -- Engineering methods for small, movable sources in reverberant fields -- Part 2: Methods for special reverberation test rooms	Valid

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GB/T 4214.3   GB/T 4214.8   GB/T 4214.9   GB/T 4214.21   GB/T 4214.17   GB/T 6881   

Basic data

Standard ID: GB/T 6881.3-2002 (GB/T6881.3-2002)
Description (Translated English): Acoustics. Determination of sound power levels of noise sources-using sound pressure. Engineering metheds for small, movable sources in reverberant fields. Part 2: Methods for special reverberation test rooms
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Z32
Classification of International Standard: 17.140.01
Word Count Estimation: 22,221
Date of Issue: 2002-03-26
Date of Implementation: 2002-12-01
Older Standard (superseded by this standard): GB/T 6881-1986
Quoted Standard: GB/T 3241-1998; GB/T 3785-1983; GB/T 4129-1995; GB/T 6881.1-2002; GB/T 6881.2-2002; GB/T 6882-1986; GB/T 14573.1-1993; GB/T 14573.4-1993; GB/T 15173-1994; GB/T 17181-1997; GB/T 18698-2002; GBJ 47-1983
Adopted Standard: ISO 3743-2-1994, IDT
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China
Summary: This standard specifies a small movable determine sound power levels of noise sources Engineering method is relatively simple. This measurement is necessary to consider the sound source is placed within a predetermined frequency range specifically designed reverberation time room. Sound source under test A-weighted sound power level is done by a single microphone position measurement to determine the A-weighted sound pressure level, not by summing octave SPL. Direct method avoids the need to use the standard sound source, but require special reverberation test rooms. Direct method based on the premise: You can use the test chamber space and time to get the average sound pressure level sound source sound power level emitted. Choose special reverberation test room features, so the measured sound power output of the device to be small. Special provisions to the test chamber microphone and the sound source position number of locations. Special reverberation chamber design guidelines in Appendix B. In addition to direct methods, but also tells a comparison method (see 8. 3). However, because the GB/T 6881. 2 comparative law limits the test chamber requires less obviously, so when special reverberation test rooms inconvenience applications, it is recommended to use GB/T 6881. 2 comparative law.

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