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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
Electromechanical components for electronic equipment—Basic testing procedures and measuring methods—Part 25-1: Test 25a: Crosstalk ratio
Standard published on 9.3.2021
Selected format:Electromechanical components for electronic equipment—Basic testing procedures and measuring methods—Part 25-2: Test 25b: Attenuation (insertion loss)
Standard published on 9.3.2021
Selected format:Electromechanical components for electronic equipment—Basic testing procedures and measuring methods—Part 25-3: Test 25c: Rise time degradation
Standard published on 9.3.2021
Selected format:Electromechanical components for electronic equipment—Basic testing procedures and measuring methods—Part 25-4: Test 25d: Propagation delay
Standard published on 9.3.2021
Selected format:Electromechanical components for electronic equipment—Basic testing procedures and measuring methods—Part 25-5Test 25e: Return loss
Standard published on 9.3.2021
Selected format:Electromechanical components for electronic equipment—Basic testing procedures and measuring methods—Part 25-6Test 25fEye pattern and jitter
Standard published on 28.4.2020
Selected format:Electromechanical components for electronic equipment—Basic testing procedures and measuring methods—Part 25-7: Test 25g: Impedance, reflection coefficient, and voltage standing wave ratio (VSWR)
Standard published on 9.3.2021
Selected format:Electromechanical components for electronic equipment—Basic testing procedures and measuring methods—Part 25-9: Signal integrity testsTest 25i: Alien crosstalk
Standard published on 28.4.2020
Selected format:Electromechanical components for electronic equipment--Basic testing procedures and measuring methods--Part 3:Current-carrying capacity tests
Standard published on 26.12.1997
Selected format:Electromechanical components for electronic equipment--Basic testing procedures and measuring methods--Part 4:Dynamic stress tests
Standard published on 26.12.1997
Selected format:Latest update: 2026-07-05 (Number of items: 2 286 116)
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