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GB - Chinese national standards
Page 1381
GB/T 21224-2007 (03/12/2007)
Methods of test for the evaluation of water treeing in insulating materials
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 568.80 USD more info
GB/T 21225-2007 (03/12/2007)
Emergency power supply with inverter
Available languages: English, Chinese
Available design: electronic design (pdf), Print design
from 1 030.80 USD more info
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 448.80 USD 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 412.80 USD 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 352.80 USD 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 460.80 USD 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 400.80 USD 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 928.80 USD 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 868.80 USD 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 592.80 USD more info
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