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GB - Chinese national standards
Page 1406
GB/T 21226-2007 (03/12/2007)
Semiconductor convertors - Identification code for convertor connections
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 406.10 EUR more info
GB/T 21227-2021 (21/05/2021)
AC loss measurements—Magnetometer methods for hysteresis loss in superconducting multifilamentary composites
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 373.50 EUR more info
GB/T 21228.1-2007 (14/11/2007)
Acoustics - Sound-scattering properties of surfaces - Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 319.20 EUR more info
GB/T 21228.2-2023 (23/05/2023)
Acoustics—Sound-scattering properties of surfaces—Part 2Measurement of the directional diffusion coefficient in a free field
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 417.00 EUR more info
GB/T 21229-2007 (14/11/2007)
Acoustics - Determination of sound power levels of noise from air-terminal devices,air-terminal units,dampers and valves by measurement in a reverberation room
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 362.70 EUR more info
GB/T 21230-2014 (03/09/2014)
AcousticsDetermination of occupational noise exposureEngineering method
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 840.40 EUR more info
GB/T 21231.1-2018 (15/03/2018)
Acoustics—Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices—Part 1: Airborne noise measurement
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 786.10 EUR more info
GB/T 21231.2-2018 (15/03/2018)
Acoustics—Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices—Part 2: Structure-borne vibration measurements
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 536.40 EUR more info
GB/T 21232-2007 (14/11/2007)
Acoustics - Guidelines for noise control in offices and workrooms by means of acoustical screens
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 384.40 EUR more info
GB/Z 21233-2007 (14/11/2007)
Acoustics - Assessment of noise annoyance by means of social and socio-acoustics surveys
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 340.90 EUR more info
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