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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
Methods of measuremant for radio equipment used in satellite earth stations--Part 2:Measurements for sub-systems--Section four:Up and down converters
Standard published on 31.3.1989
Selected format:Methods of measurement for radio equipment used in satellite earth stations--Part 2:Measurements for sub-systems--Section seven:Frequency demodulators--Section eight:Frequency demodulators
Standard published on 31.3.1989
Selected format:Rotating electrical machines—Part 34:AC adjustable speed rolling mill motors
Standard published on 3.12.2025
Selected format:Blank detail specification for variable tuning capacitors type A in electronic equipments
Standard published on 31.3.1989
Selected format:Blankdetail specification for variable tuning capacitors type A fitted with integralpreset capacitors type C in electronic equipments
Standard published on 31.3.1989
Selected format:Blank detail specification for variable trimmer capacitors type B in electronic equipments
Standard published on 31.3.1989
Selected format:Blank detail specification for variable preset capacitors type C in electronic equipments
Standard published on 31.3.1989
Selected format:Fixed capacitors for use in electronic equipment--Sectional specification--Fixed capacitors of ceramic dielectric class 3
Standard published on 31.3.1989
Selected format:Fixed capacitors for use in electronic equipment--Blank detail specification:Fixed capacitors of ceramic dielectric class 3--Assessment level E
Standard published on 31.3.1989
Selected format:Test methods for the properties of piezoelectric ceramics--Quasi-static testfor piezoelectric strain content d33
Standard published on 31.3.1989
Selected format:Latest update: 2026-06-03 (Number of items: 2 281 391)
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