Xaiv thiab siv Digital Multimeter: Kev Ntsuas Kev Qhia
Analog multimeters muaj qhov kev nyeem ntawv tsawg, tab sis lub pointer txav yog intuitive. Nws lub viav vias nrawm thiab amplitude feem ntau tuaj yeem cuam tshuam qhov loj ntawm qhov ntsuas qhov ntsuas (xws li kuaj pom me ntsis ntawm lub tsheb npav TV (SDL) thaum lub sijhawm xa cov ntaub ntawv). Digital multimeters muab kev nyeem ncaj qha ncaj qha, tab sis qhov hloov pauv sai thiab tsis zoo ntawm tus lej tuaj yeem nyuaj ua raws qhov pom.
Analog multimeters feem ntau muaj ob lub roj teeb: 1.5V roj teeb uas tsis muaj hluav taws xob thiab lub roj teeb 9V lossis 15V high-voltage. Cov tshuaj ntsuam dub yog qhov zoo txheeb ze rau cov hlau lead liab. Digital multimeters feem ntau siv ib lub roj teeb 6V lossis 9V. Hauv hom kev tiv thaiv, analog multimeters tso zis ntau dua tam sim no dua li cov digital. Lub × 1Ω ntau tuaj yeem tsim lub suab meej "nias" los ntawm tus neeg hais lus, thiab × 10kΩ ntau tuaj yeem ua rau lub teeb pom kev zoo (LED).
Hauv hom hluav taws xob, analog multimeters muaj qhov tsis kam sab hauv thiab qis ntsuas qhov tseeb. Tej zaum lawv yuav tsis ntsuas qhov tseeb nyob rau hauv high-voltage, tsawg-tam sim no daim ntaub ntawv vim hais tias lawv cov kev tiv thaiv nyob rau hauv lub Circuit Court nyob rau hauv lub xeem (xws li, qhov ntsuas acceleration voltage ntawm TV CRT yuav qis dua tus nqi tiag). Cov multimeters digital muaj cov input impedance siab heev nyob rau hauv voltage hom, tsawg kawg yog nyob rau hauv lub megaohm ntau yam, yog li ntawd lawv siv me ntsis cuam tshuam rau lub ntsuas Circuit Court. Txawm li cas los xij, lawv cov zis impedance siab heev ua rau lawv muaj kev cuam tshuam rau qhov induced voltages, thiab kev nyeem ntawv tej zaum yuav tsis tseeb nyob rau hauv ib puag ncig uas muaj zog electromagnetic cuam tshuam.
Hauv cov ntsiab lus, analog multimeters yog tsim rau ntsuas high-tam sim no, high-voltage analog circuits xws li TVs thiab suab amplifiers. Digital multimeters yog qhov zoo dua rau cov hluav taws xob qis, qis tam sim no digital circuits xws li pagers thiab xov tooj ntawm tes. Qhov no tsis yog kiag li; ob hom tuaj yeem xaiv raws li cov xwm txheej tiag tiag.
