Yuav ua li cas yog txoj kev ntawm kev siv ib tug multimeter los ntsuam xyuas qhov zoo ntawm lub Circuit Court board
Lub multimeter tuaj yeem siv tsis tau tsuas yog ntsuas qhov tsis kam ntawm cov khoom ntsuas, tab sis kuj ntsuas qhov DC voltage. Qee qhov multimeters tuaj yeem ntsuas qhov tseem ceeb ntawm cov transistors thiab lub peev xwm ntawm capacitors. Nws yog ib qho ntawm cov kev txawj ntse tshaj plaws ntawm kev siv tshuab hluav taws xob kom ua tau zoo hauv kev siv multimeters. Multimeters muaj xws li pointer multimeters thiab digital multimeters.
Lub pointer multimeter yog ib qho kev ntsuas ntau yam nrog lub ntsuas lub taub hau raws li cov ntsiab lus tseem ceeb, thiab ntsuas tus nqi yog nyeem los ntawm tus pointer ntawm lub taub hau meter. Qhov ntsuas tus nqi ntawm digital multimeter yog ncaj qha tso tawm hauv daim ntawv digital los ntawm cov kua siv lead ua kua, uas yooj yim nyeem, thiab qee qhov kuj muaj lub suab nrov ua haujlwm. Multimeter yog ib lub 'meter' uas sib txuas lub voltmeter, ammeter thiab ohmmeter hauv ib lub taub hau.
Cov ntaub ntawv DC tam sim no ntawm multimeter yog ntau hom DC voltmeter. Qhov hluav taws xob ntau tuaj yeem nthuav dav los ntawm kev sib txuas ntawm qhov hluav taws xob kaw hluav taws xob faib hluav taws xob sib txuas nrog lub taub hau 'meter'. Cov ntaub ntawv DC voltage ntawm multimeter yog ntau yam DC voltmeter. Txuas lub voltage faib resistor nyob rau hauv series nrog lub 'meter' lub taub hau yuav nthuav nws voltage ntau yam. Qhov sib txawv voltage faib cov resistors muaj qhov sib txawv ntsuas qhov sib txawv.
1. Offline nrhiav tau
Ntsuas qhov ntsuas qhov zoo thiab qhov tsis zoo ntawm txhua tus pin ntawm IC nti thiab hauv av. Muab piv nrog IC nti zoo kom pom qhov yuam kev.
2. Kev tshawb nrhiav hauv online
Txoj kev tshawb pom ntawm DC tsis kam yog tib yam li kev tshawb nrhiav offline. Tab sis ua tib zoo mloog: Txhawm rau tshem tawm cov khoom siv hluav taws xob ntawm lub rooj tsav xwm hluav taws xob los kuaj, qhov hluav taws xob sab hauv ntawm multimeter yuav tsum tsis txhob siab dua 6V. Thaum ntsuas, xyuam xim rau qhov cuam tshuam ntawm qhov nruab nrab.
3. AC ua hauj lwm voltage xeem txoj kev
Siv lub multimeter nrog cov ntaub ntawv dB los ntsuas qhov kwv yees tus nqi ntawm AC voltage ntawm IC. Yog tias tsis muaj dB cov ntaub ntawv, ib qho 0.1-0.5μF kev rho tawm DC capacitor tuaj yeem txuas nrog cov khoom siv kuaj pom zoo. Txoj kev no yog tsim rau ICs nrog kev ua haujlwm tsawg zaus. Txawm li cas los xij, nws yuav tsum raug sau tseg tias cov teeb liab no yuav cuam tshuam los ntawm ntuj zaus thiab waveform, yog li cov ntaub ntawv ntsuas yog kwv yees qhov tseem ceeb.
4. Tag nrho txoj kev ntsuas tam sim no
Los ntawm kev ntsuas tag nrho tam sim no ntawm IC fais fab mov, qhov zoo ntawm IC tuaj yeem txiav txim siab. Txij li feem ntau ntawm cov ICs yog DC-coupled, thaum lub IC puas lawm (xws li PN junction breakdown los yog qhib Circuit Court), nws yuav ua rau cov theem tom ntej yuav saturated thiab txiav tawm, thiab tag nrho cov tam sim no yuav hloov. Yog li ntawd, kev ntsuas tag nrho tam sim no tuaj yeem txiav txim siab seb IC puas zoo lossis phem. Qhov voltage ntawm lub voj tsis kam yog ntsuas hauv online, thiab tus nqi tam sim no tuaj yeem suav tau.
