Lub hauv paus ntsiab lus ntawm lub suab ntsuas, cov cai tswj xyuas, kev txheeb xyuas cov qauv hauv cov qauv uas muaj feem xyuam
Noise meter, tseem hu ua suab ntsuas ntsuas, yog ib qho cuab yeej uas tuaj yeem ntsuas lub suab nrov ntawm cov suab nrov, suab nrov hauv tsev thiab suab nrov, thiab lwm yam, kwv yees raws li cov yam ntxwv ntawm tib neeg pob ntseg.
Lub suab nrov yog hais txog lub suab siab (dB) lossis qib suab nrov (phon) ntsuas nrog lub suab ntsuas ntsuas thiab kho kom hnov lus.
Raws li qhov tseeb ntawm lub suab ntsuas ntsuas ntsuas 1000Hz ntshiab lub suab raws li tus qauv, hauv xyoo 1960, lub suab ntsuas ntsuas tau muab faib ua ob pawg hauv ntiaj teb, ib qho hu ua precision suab ntsuas ntsuas, thiab lwm qhov hu ua suab nrov zoo tib yam. meter.
Peb lub teb chaws kuj siv txoj kev no. Feem ntau muaj peb hom suab nrov sib txuas: A, B, thiab C. Lub suab nrov A-hnyav yog simulate cov yam ntxwv zaus ntawm tib neeg lub pob ntseg mus rau lub suab nrov qis qis dua 55 decibels; B-hnyav suab qib yog simulate cov yam ntxwv zaus ntawm 55-85 decibels ntawm nruab nrab-siv suab nrov; C-weighted suab theem yog simulate zaus cov yam ntxwv ntawm high-siv suab nrov yam ntxwv.
Txij li thaum xyoo 1970s, qee lub tebchaws tau qhia txog plaub hom, uas tau muab faib ua Hom 0, Hom 1, Hom 2 thiab Hom 3. Lawv qhov tseeb yog ±0. 4dB, ±0.7dB, ±1.0dB, thiab ±1.5dB, feem.
Raws li cov khoom siv hluav taws xob sib txawv siv los ntawm lub suab ntsuas ntsuas, nws tuaj yeem muab faib ua AC hom thiab DC hom suab ntsuas ntsuas nrog cov roj teeb qhuav, thiab tom kawg kuj tuaj yeem nqa tau. Portable muaj qhov zoo ntawm qhov me me, lub teeb yuag thiab yooj yim siv rau ntawm qhov chaw.
Feem ntau, nws yog tsim los ntawm microphone, amplifier, attenuator, hnyav network, detector, qhia meter thiab fais fab mov.
(1) Microphone Nws yog ib qho cuab yeej uas hloov lub suab siab teeb liab mus rau hauv lub teeb liab voltage, los yog lub microphone, thiab yog lub sensor. Cov microphones feem ntau yog siv lead ua, electret, txav coil, thiab condenser.
(2) Amplifiers thiab attenuators Ntau yam khoom siv hauv tsev thiab txawv teb chaws uas nrov nyob rau tam sim no siv ob-theem amplifiers nyob rau hauv amplification circuit, uas yog, input amplifier thiab cov zis amplifier, thiab lawv txoj haujlwm yog los ua kom lub zog hluav taws xob tsis muaj zog.
(3) Weighting network Weighting network feem ntau muaj peb hom: A, B, thiab C. Lub suab nrov A-hnyav yog simulate cov yam ntxwv zaus ntawm tib neeg lub pob ntseg kom qis qis qis qis dua 55 decibels; B-weighted suab theem yog simulate zaus tus yam ntxwv ntawm 55-85 decibels ntawm nruab nrab-siv suab nrov; C-weighted suab theem yog simulate zaus cov yam ntxwv ntawm high-siv suab nrov yam ntxwv.
(4) Geophone thiab qhov taw qhia meter Yuav kom pom cov teeb liab amplified los ntawm lub ntsuas, lub geophone kuj tseem xav tau los hloov cov teeb liab hloov pauv sai sai rau hauv qhov hloov pauv qeeb DC voltage teeb liab.
