GB/T 21271-2026 Vacuum technology—Noise measurement for vacuum pumps

GB/T 21271-2007 Vacuum technology—Noise measurement for vacuum pumps

GB/T 3241-1998 Octave-band and fractional-octave-band filters GB/T 3241-2010 Electroacoustics—Octave-band and fractional-octave-band filters GB/T 3241.1-2025 Electroacoustics—Octave-band and fractional-octave-band filters—Part 1:Specifications GB/T 3241.2-2025 Electroacoustics—Octave-band and fractional-octave-band filters—Part 2:Pattern evaluation tests GB/T 3785.1-2023 Electroacoustics—Sound level meters—Part 1:Specifications GB/T 4129-2003 Acoustics—Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels GB/T 4129-2025 Acoustics—Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels GB/T 14574-2000 Acoustics—Declaration and verification of noise emission values of machinery and equipment GB/T 17248.2-1999 Acoustics—Noise emitted by machinery and equipment—Measurement of emission sound pressure levels at a work station and at other specified positions—Engineering method in an essentially free field over a reflecting plane GB/T 17248.2-2018 Acoustics—Noise emitted by machinery and equipment—Determination of emission sound pressure levels at a work station and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections GB/T 17248.3-1999 Acoustics—Noise emitted by machinery and equipment—Measurement of emission sound pressure levels at a work station and at other specified positions—Survey method in situ GB/T 17248.3-2018 Acoustics—Noise emitted by machinery and equipment—Determination of emission sound pressure levels at a work station and at other specified positions applying approximate environmental corrections ISO 11203/Amd 1