Kev xaiv ntawm Analog Multimeters thiab Digital Multimeters
1. Kev nyeem ntawv qhov tseeb ntawm pointer meters yog qhov tsis zoo, tab sis cov txheej txheem ntawm pointer oscillation yog qhov yooj yim heev, thiab qhov amplitude ntawm nws cov oscillation ceev muaj peev xwm qee zaum objectively cuam tshuam qhov loj ntawm cov khoom ntsuas (xws li me ntsis jitter ntawm TV cov ntaub ntawv tsheb npav (SDL) thaum xa cov ntaub ntawv); Kev nyeem ntawv ntawm digital multimeter yog intuitive, tab sis cov txheej txheem ntawm kev hloov pauv digital zoo li ntxhov thiab nyuaj rau kev soj ntsuam.
2. Feem ntau muaj ob lub roj teeb nyob rau hauv ib lub ntsuas ntsuas, ib qho muaj qhov tsis tshua muaj hluav taws xob ntawm 1.5V thiab lwm qhov muaj qhov hluav taws xob siab ntawm 9V lossis 15V. Qhov kev sojntsuam dub yog lub davhlau ya nyob twg zoo txheeb ze rau qhov kev sojntsuam liab. Ib qho digital multimeter feem ntau siv 6V lossis 9V roj teeb. Nyob rau hauv hom tsis kam, cov zis tam sim no ntawm lub ntsuas ntsuas ntsuas yog qhov loj dua li ntawm cov ntsuas digital, siv R & TImes; 1 Ω hom tuaj yeem ua rau tus neeg hais lus tawm suab nrov "nias", siv R & TImes; Qhov 10k Ω ntau tuaj yeem ua rau lub teeb ci -emitting diode (LED).
3. Nyob rau hauv qhov hluav taws xob ntau, qhov kev tiv thaiv sab hauv ntawm lub ntsuas ntsuas ntsuas yog qhov me me piv rau digital multimeter, thiab qhov tseeb ntawm qhov ntsuas ntsuas yog qhov tsis zoo. Hauv qee qhov siab -voltage microcurrent qhov xwm txheej, nws tseem tsis tuaj yeem ntsuas qhov tseeb vim nws qhov kev tiv thaiv sab hauv tuaj yeem cuam tshuam rau qhov ntsuas hluav taws xob (piv txwv li, thaum ntsuas qhov nrawm ntawm lub TV cathode ray tube, qhov ntsuas tus nqi yuav qis dua li tus nqi tiag). Qhov kev tiv thaiv sab hauv ntawm qhov hluav taws xob ntau ntawm digital multimeter yog siab heev, yam tsawg kawg hauv megaohm ntau yam, thiab muaj kev cuam tshuam me ntsis ntawm qhov ntsuas hluav taws xob. Txawm li cas los xij, qhov tso zis ntau dhau impedance ua rau nws muaj kev cuam tshuam rau qhov cuam tshuam ntawm induced voltage, thiab cov ntaub ntawv ntsuas nyob rau hauv qee qhov xwm txheej uas muaj zog electromagnetic cuam tshuam yuav tsis raug.
4. Nyob rau hauv luv luv, pointer meters yog haum rau ntsuas analog circuits nrog kuj muaj tam sim no thiab high voltage, xws li TVs thiab suab amplifiers. Cov ntsuas hluav taws xob tsim nyog rau kev ntsuas qhov ntsuas hluav taws xob tsawg thiab tsis tshua muaj hluav taws xob tam sim no, xws li BP cov cav tov, xov tooj ntawm tes, thiab lwm yam. Tsis yog qhov tseeb, koj tuaj yeem xaiv lub ntsuas ntsuas ntsuas thiab lub ntsuas ntsuas digital raws li qhov xwm txheej.
