Kev ntsuas kev ntsuas thiab multimeter's AC zaus teb
Cov multimeter tsis tuaj yeem ntsuas DC voltage (DCV), AC voltage (ACV), DC tam sim no (DCA), AC tam sim no (ACA), tsis kam (Ω), diode rau pem hauv ntej voltage poob (VF), transistor emitter tam sim no amplification yam ( hrg), kuj tseem tuaj yeem ntsuas qhov capacitance (C), conductance (ns), qhov kub thiab txias (T), zaus (f), thiab ntxiv cov ntaub ntawv buzzer (BZ) rau kev kuaj xyuas qhov txuas ntxiv ntawm kab, txoj kev siv hluav taws xob tsawg los ntsuas cov ntaub ntawv tiv thaiv ( L0Ω). Qee cov twj paj nruag kuj muaj inductance iav, teeb liab iav, AC / DC tsis siv neeg hloov dua siab tshiab muaj nuj nqi, thiab capacitance iav tsis siv neeg ntau yam hloov pauv.
Feem ntau hais lus, txoj kev ntsuas ntawm multimeter feem ntau yog rau kev ntsuas ntawm AC cov cim. Peb txhua tus paub tias muaj ntau hom AC teeb liab thiab ntau yam teeb meem nyuaj, thiab nrog rau kev hloov ntawm zaus ntawm AC teeb liab, ntau zaus cov lus teb tshwm sim, uas cuam tshuam rau kev ntsuas ntawm multimeter. Feem ntau muaj ob txoj hauv kev rau multimeters los ntsuas AC signals: tus nqi nruab nrab thiab qhov tseeb RMS ntsuas. Kev ntsuas tus nqi nruab nrab yog feem ntau rau cov ntshiab sine tsis, nws siv txoj kev kwv yees thiab nruab nrab los ntsuas AC cov cim, tab sis rau cov tsis muaj sine wave signals, yuav muaj qhov yuam kev loj.
Nyob rau tib lub sijhawm, yog tias lub teeb liab sine yoj muaj kev cuam tshuam kev sib raug zoo, nws qhov kev ntsuas qhov yuam kev kuj tseem yuav hloov pauv, thiab qhov tseeb RMS ntsuas yog xam qhov tam sim no thiab qhov hluav taws xob los ntawm kev muab cov txiaj ntsig siab tshaj plaws ntawm lub waveform los ntawm 0. 707 los xyuas kom meej tias qhov distortion thiab suab kaw lus raug nyeem hauv . Nyob rau hauv txoj kev no, yog tias koj xav tau kom pom cov ntaub ntawv digital zoo tib yam, qhov ntsuas nrog tus nqi nruab nrab multimeter yuav tsis ua tiav qhov ntsuas qhov tseeb. Tib lub sijhawm, cov lus teb zaus ntawm AC teeb liab kuj tseem tsim nyog, thiab qee qhov tuaj yeem siab txog 100KHz.
Txoj Kev Txhim Kho ntawm Digital Multimeter
Kev sib xyaw ua ke: Lub handheld digital multimeter siv ib-chip A / D converter, thiab peripheral Circuit Court yog yooj yim, yuav tsum tau tsuas yog ob peb pab chips thiab cov khoom. Nrog lub advent ntawm nplooj siab chips rau ib tug-chip digital multimeters, ib tug tag nrho functional tsis siv neeg ntau yam digital multimeter tuaj yeem tsim siv ib leeg IC, uas tsim kom muaj txiaj ntsig zoo rau kev tsim kom yooj yim thiab txo cov nqi.
Kev siv hluav taws xob tsawg: cov khoom siv digital tshiab feem ntau siv CMOS loj-teev kev sib txuas ntawm A / D converters, thiab lub zog siv ntawm tag nrho lub tshuab yog tsawg heev.
