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Standards GB - Chinese national standards - Page 8471
Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
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GB 6879-1986
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Specifications of 30 channels pulse code modulation multiplex equipment at 2048 kbit/s
WITHDRAWN published on 1.1.1986
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GB/T 688-1992
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Chemical reagents;Carbon tetra-chloride
WITHDRAWN published on 1.9.1992
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GB 6880-1986
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Measuring methods of 30 channels pulse code modulation multiplex equipment at 2048 kbit/s
WITHDRAWN published on 1.1.1986
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GB/T 6881-1986
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Acoustics--Determination of sound power levels of noise sources--Precision methods and engineering methods for reverberation rooms
WITHDRAWN published on 13.9.1986
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GB/T 6881.1-2002
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Acoustics—Determination of sound power levels of noise sources using sound pressure—Precision methods for reverberation rooms
WITHDRAWN published on 26.3.2002
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GB/T 6881.2-2002
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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
WITHDRAWN published on 26.3.2002
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GB/T 6881.3-2002
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Acoustics--Determination of sound power levels of noise sources-using sound pressure--Engineering methods for smallmovable sources in reverberant fields--Part 2:Methods for special reverberation test rooms
WITHDRAWN published on 26.3.2002
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GB/T 6882-1986
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Acoustics—Determination of sound power levels of noise sources—Precision methods for anechoic and semi-anechoic rooms
WITHDRAWN published on 13.9.1986
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GB/T 6882-2008
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Acoustics—Determination of sound power levels of noise sources using pressure—Precision methods for anechoic and hemi-anechoic rooms
WITHDRAWN published on 2.7.2008
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GB 6883-1986
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Wire, bar or tube drawing dies-as sintered pellets of hard metal (cemented carbide)
WITHDRAWN published on 1.1.1986
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