Ib qho kev taw qhia rau qee yam ntawm cov suab nrov qib ntsuas
1. Integral suab theem ntsuas
Rau cov suab nrov tsis nyob ruaj ruaj, nws yuav tsum ntsuas qhov sib npaug ntawm qhov sib npaug ntawm lub suab nrov Leq, txhais tau tias: nyob rau hauv lub suab teb ntawm ib qho chaw taw tes, nrog rau qee lub sij hawm lub zog nruab nrab txoj kev, kev hloov pauv hauv ntau qhov sib txawv A suab theem, mus rau qib A suab nruab nrab yog qhov loj ntawm lub suab nrov thaum lub sijhawm ntawd.
Kev sib koom ua ke ntawm lub suab ntsuas tuaj yeem tso ncaj qha rau qhov sib npaug ntawm lub suab sib npaug ntawm cov suab nrov ntsuas hauv qee lub sijhawm ntsuas hauv daim ntawv digital. Kev ua tau zoo yuav tsum ua tau raws li qhov yuav tsum tau ua ntawm IEC804 thiab GB / T17181 tus qauv. Daim duab schematic yog qhia nyob rau hauv daim duab 2, uas yog tsim los ntawm microphone, preamplifier, zaus hnyav amplifier, ntau yam conversion, overload indication circuit, logarithmic detector thiab DC amplifier, A/D converter, microprocessor, memory, LCD zaub, key input. vaj huam sib luag, siv calibration teeb liab thiab fais fab mov, interface Circuit Court thiab lwm yam.
Integral Sound Level Meter Schematic Diagram
Microphone: electret test condenser microphone, hloov lub suab teeb liab mus rau hauv hluav taws xob teeb liab, nrog zoo stability, dav zaus teb thiab hais txog.
Preamplifier: nrog siab input impedance thiab cov zis impedance tsawg, nws plays lub luag hauj lwm ntawm impedance conversion.
Kev suav suav amplification, ntau yam hloov pauv, overload indication circuit: qhov no ntawm lub Circuit Court yog los ntawm lub preamplifier los ua kom lub zog tsis muaj zog kom ncav cuag qee qhov amplitude, ntau yam hloov pauv Circuit Court raws li kev tswj hwm ntawm microprocessor, kom ntseeg tau tias tag nrho cov amplifier hauv kev ntsuas. ntau yam yuav undistorted kom muaj kev cuam tshuam qhov loj ntawm cov input teeb liab hloov. Thaum lub teeb liab tshaj qhov ntsuas qhov ntsuas ntawm qhov tam sim no ntau dhau qhov taw qhia Circuit Court cia li tswj lub teeb overload los qhia qhov
Logarithmic detector thiab DC amplifier: Nws yog txhawm rau txheeb xyuas tus nqi RMS ntawm AC teeb liab los ntawm AC amplifier uas sib haum mus rau qhov ntsuas suab thiab ua kom nrov nrov hauv ib qho kev faib ua feem, kom DC amplifier outputs ib linearly hloov DC voltage sib xws mus ntsuas suab theem.
A / D converter, microprocessor, nco, interface Circuit Court: cov khoom no tsim ua tiav microcontroller system, microprocessor nyob rau hauv kev tswj ntawm qhov kev pab cuam nco, A / D converter rau timed sampling, thiab tsis siv neeg ntsuas, thaum lub ntsuas ntsuas tau muab cia rau hauv lub cim xeeb thiab tso zis rau lub tshuab luam ntawv lossis microcomputer los ntawm lub interface Circuit Court.
Zaub ib feem thiab vaj huam sib luag: LCD zaub tuaj yeem tso saib thiab tso tawm lub moos, hom kev ua haujlwm, ntsuas cov ntaub ntawv, zaus thiab lwm yam ntsuas ntsuas thiab ntsuas ntsuas, lub vaj huam sib luag muab cov lus qhia tswj interface, raws li kev ntsuas ntsuas, hom kev ua haujlwm, tswj Cov teeb liab yog nkag mus rau microprocessor kom ua tiav lub suab nrov ntsuas thiab ntsuas.
Siv cov teeb liab calibration thiab fais fab mov: powered los ntawm lub roj teeb (los yog sab nraud input) ib tug zoo voltage hloov dua siab tshiab rau hauv qhov yuav tsum tau muaj qhov zoo thiab tsis zoo voltage, lub luag hauj lwm rau lub hwj chim mov ntawm tag nrho cov tshuab. Thiab tsim ib qho kev siv teeb liab raws li kev ntsuas hluav taws xob sab hauv.
