Mis on mõõtmine ja ettevaatusabinõud müra detektor
Müra seire on the monitoring activity of the sound and its sound sources that interfere with people's study, work and life. These include: noise monitoring of different functional areas of the city, road traffic noise monitoring, regional environmental noise monitoring and noise source monitoring, etc. The noise monitoring results analysis the current situation and changing trend of noise pollution, and also basic data for the planning, management and comprehensive improvement of noise pollution.
Üldiselt väljendatud kui A-kaalutud heli tase, the main instrumendid kasutatud on heli tase meeter ja spekter analüsaator. The results of noise monitoring are used to analyze the status quo and changing trend of noise pollution, and also provide basic data for planning, management and comprehensive improvement of noise pollution.
The noise tester is an instrument used for noise detection and testing in public places such as work sites and squares. Noise pollution is one the the most influal environmental pollution. Higher detsibel noise can even cause serious damage to human eardrums, resulting in deafness. The application of the noise tester can provide the detsibellid of the noise so that relevant measures can take to control and the the noise. the the mõõtühik ühik heli tase is detsibell. the professionaalne müra tester on a väga tundlik andur, kõrge täpsus, lai rakendus vahemik, ja saab olla laialdaselt kasutada in müra mõõtmine erinevates keskkondades.
Müra mõõtmine mõõteriistad kasutamine müra as a mõõtmine of a test signaal:
Noise is used as a test signal to measure satelliidid, and noise is used as a test signaal to realize wide-spectrum and dynamic measurement of the system. Üldiselt, Gaussi valge müra is kasutatakse as the test signaal, its tõenäosus tihedus funktsioon is Gaussi (obeys normal distribution), and its võimsus tihedus spekter is lame (in a sagedus riba palju laiem kui see uuritud).
For example, in the multi-carrier multiplexing system, the noise load test is carried out to estimate the intermodulation distortion and the spurious background noise caused by the communication in other channels in the system. By adding white noise to the system to simulate the actual pass-through of all channels, and through a band-stop filter to keep the channel under test in an idle state. Then, a band-pass filter is used at the receiving end to measure the background noise of the idle channel to simulate the actual working state of the system.
