Standards GB - Chinese national standards - Page 7548

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GB/T 7341.3-1998 WITHDRAWN

Audiometers Part 3:Auditory test signals of short duration for audiometric and neuro-otological purposes

WITHDRAWN published on 8.5.1998

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GB/T 7342-1987 WITHDRAWN

IEC provisional reference coupler for the calibration of earphones used in audiometry

WITHDRAWN published on 28.2.1987

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GB/T 7343-1987 WITHDRAWN

the frequency range of 10 kHz to 30 MHz Methods of measurement of the suppression characteristics of passive radio inerference filters and suppression components over

WITHDRAWN published on 2.3.1987

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