Standards GB - Chinese national standards - Page 5140

Blank detail specification for case-rated bipolar transistors for low-frequency amplification

Standard published on 9.7.1996

Dimensions of outlines for semiconductor discrete devices

Standard published on 27.3.1987

Dimensions of outlines for discrete semiconductor devices
Execute Date: october 2026

Standard published on 31.3.2026

Acoustics—Statistical distribution of hearing thresholds related to age and gender

Standard published on 1.8.2025

Acoustics--Pure tone air conductionthreshold audio-metry--For hearing conservation purposes

Standard published on 27.3.1987

Acoustics--Hearing protectors--Part 1:Subjective method for the measurement of sound attenuation

Standard published on 13.5.2004

Acoustics—Hearing protectors—Part 1: Subjective method for the measurement of sound attenuation
Execute Date: september 2026

Standard published on 27.2.2026

Acoustics--Hearing protectors--Part 2:Estimation of effective A-weighted sound pressure levels when hearing protectors are worn

Standard published on 24.8.1999

Acoustics—Hearing protectors—Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn
Execute Date: september 2026

Standard published on 27.2.2026

Acoustics - Hearing protectors - Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture

Standard published on 30.12.2011