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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
Design margin and abuse tests for electronic measuring instruments
WITHDRAWN published on 3.9.1991
Selected format:Requirements for long haul optical fiber cable systems joined to national public telecommunication network
WITHDRAWN published on 4.9.1991
Selected format:General specification for 8MHz (1800ch) carrier systems on standardized 2.6/9.5mm cable pairs
WITHDRAWN published on 4.9.1991
Selected format:General specification for 4MHz (960ch) carrier systems on standardized 1.2/2.4mm cable pairs
WITHDRAWN published on 4.9.1991
Selected format:Test charts of reflection for television Multiple test chart
WITHDRAWN published on 4.9.1991
Selected format:Test charts of reflection for television Registration test chart B
WITHDRAWN published on 4.9.1991
Selected format:Test charts of reflection for television Circular zone test chart
WITHDRAWN published on 4.9.1991
Selected format:Test charts of reflection for television Radiation stripe test chart
WITHDRAWN published on 4.9.1991
Selected format:Test charts of reflection for television Area test chart
WITHDRAWN published on 4.9.1991
Selected format:Test charts of reflection for television Grayscale test chart A
WITHDRAWN published on 4.9.1991
Selected format:Latest update: 2026-01-21 (Number of items: 2 257 297)
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