semi-anechoic lab
TRANSCRIPT
Semi-Anechoic Lab
IntroductionSystem noise level is requested in some restricted field uses such as medical term. Noise source comes from operating components & devices and also by their resonance. The capability of Semi-Anechoic chamber is to set an environment to isolate external noise in order to measure the sound generated from system. With the test, it can be found the noise source in order to create a solution to meet the noise requirement.
Test product: System
Features:Semi-Anechoic chamber, follows ISO-3745 regulation
to set a free sound field environment.
GRAS Microphone: Expertise of noise sensor vendor.
Software DSP Italy (DSP Signal analyzing software).
Satisfy inverse square frequency: 136Hz~20kHz.
Sound insulation≧50dB.
Inside Sound insulation ≦15dB(A).
Low noise product becomes even more popular nowadays. By testing in the Semi-Anechoic chamber, it can be easy to find the noise source and create a solution for it.
Acoustic Enclosures Type
Inner Size
Semi-Anechoic Chamber
250cmL x 250cmW x 250cmH
Outside Size
Insulation
395cmL x 395cmW x 348cmH
floating floor.Electro galvanized steel(SECC),surface treatment
Compact Absorbers
Polymer Absorption wedge (Taiwan)
Acoustic Doors Pressured door, only can be open outside 4 layers of Rubber Packing
Standard Semi-Anechoic Chamber ISO3745
Rectifier 1KW 110V to 110V 1:1.
Cable Belden (USA)
Apparatus GRAS Low Noise Microphone System IEA EA-2 Electro-Acoustic Integrated SystemSoftware DSP
Acoustic Enclosures Type
Semi-Anechoic Chamber
Hz dB
1/3Octave Band Frequency
Allowable differences
≦630800 to 5000≧6300
±2.5±2.0±3.0
EUT
Microphone PreAmplifier
System Software
Acoustic IntegratedSystem
Noise Test