Multimeter ntsuas thiab AC zaus teb
Digital 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 tam sim no amplification yam ntawm lub emitter (hrg), tab sis kuj ntsuas lub capacitance (C), conductivity (ns), kub (T), zaus (f), thiab ntxiv mus xyuas cov kab tawm ntawm Buzzer cov ntaub ntawv (BZ), uas tsis muaj zog txoj kev ntsuas cov ntaub ntawv kuj. (L0Ω). Qee qhov ntsuas kuj muaj cov ntaub ntawv inductive, cov ntaub ntawv teeb liab, AC / DC tsis siv neeg hloov dua siab tshiab muaj nuj nqi, cov ntaub ntawv capacitance tsis siv neeg hloov pauv ntau yam ua haujlwm.
Feem ntau hais lus, txoj kev ntsuas ntawm multimeter feem ntau yog rau kev ntsuas ntawm AC cov cim, peb txhua tus paub tias ntau hom AC teeb liab thiab ntau yam nyuaj, thiab nrog rau kev hloov ntawm zaus ntawm AC teeb liab, muaj ntau yam. ntawm cov lus teb zaus, cuam tshuam rau kev ntsuas ntawm multimeter. Kev ntsuas ntawm AC teeb liab los ntawm multimeter feem ntau muaj ob txoj kev: qhov nruab nrab tus nqi thiab qhov tseeb RMS ntsuas. Kev ntsuas tus nqi yog feem ntau rau cov ntshiab sine yoj, uas siv qhov kev kwv yees ntawm txoj kev nruab nrab los ntsuas AC teeb liab, thaum lub teeb liab tsis yog sine yoj yuav muaj qhov yuam kev loj.
Meanwhile, yog hais tias harmonic cuam tshuam tshwm sim nyob rau hauv lub sine yoj teeb liab, qhov kev ntsuas qhov yuam kev kuj yuav hloov tau zoo heev, thaum qhov tseeb RMS ntsuas, uas siv lub instantaneous ncov nqi ntawm lub waveform multiplied los ntawm 0.707 los xam cov tam sim no thiab voltage. , xyuas kom meej kev nyeem ntawv nyob rau hauv distorted thiab nrov tshuab. Qhov no txhais tau hais tias yog tias koj xav tau kuaj cov ntaub ntawv digital cov teeb liab, koj yuav tsis tau txais qhov ntsuas qhov tseeb nrog qhov nruab nrab multimeter. Tib lub sijhawm cov lus teb zaus ntawm AC teeb liab tseem cuam tshuam, qee qhov tuaj yeem siab txog 100KHz.
Txoj kev loj hlob ntawm digital multimeter
Kev sib xyaw ua ke: handheld digital multimeter siv ib lub nti A / D converter, lub peripheral Circuit Court yog qhov yooj yim, tsuas yog ib qho me me ntawm cov chips thiab cov khoom siv. Nrog rau kev qhia tas mus li ntawm monolithic digital multimeter tshwj xeeb nti, kev siv ib daim IC tuaj yeem ua tiav kev ua tiav ntawm qhov tsis siv neeg ntau yam ntawm digital multimeter, kom yooj yim rau kev tsim thiab txo cov nqi los tsim cov txiaj ntsig zoo.
Kev siv hluav taws xob tsawg: tus tshiab digital multimeter feem ntau lees txais CMOS loj-teev kev sib koom ua ke A / D converter, tag nrho lub tshuab siv hluav taws xob tsawg heev.
