Yog vim li cas tus nqi tsis tshwm sim thaum ntsuas lub pem hauv ntej thiab rov qab tsis kam ntawm diode siv lub multimeter digital
Lub unidirectional conductivity ntawm lub diode yog conditional, uas yog, lub PN hlws ris ntawm lub diode yog rau pem hauv ntej biased ua ntej nws yuav qhib. Tsuas yog siv cov iav tiv thaiv los ntsuas qhov tsis kam, lub diode nws tus kheej tsis ua, yog li qhov ntsuas tsis tuaj yeem ntsuas. Lub diode iav ntawm lub multimeter yog tag nrho nrog voltage, feem ntau nyob ib ncig ntawm 1.5-2.8V. Thaum ntsuas lub diode, qhov hluav taws xob tau ntxiv rau ob qhov kawg ntawm lub diode kom PN hlws ris rau pem hauv ntej tsis ncaj ncees. Tsuas yog tom qab ntawd peb tuaj yeem pom txog 0.7V ntawm lub multimeter. Qhov hluav taws xob poob ua pov thawj tias lub diode zoo. Qhov kev tiv thaiv ntawm kwv yees li 10K ntsuas los ntawm lub ntsuas ntsuas ntsuas tsis raug, thiab cov txiaj ntsig tau los ntawm kev ntsuas cov diodes sib txawv kuj txawv.
Yuav ua li cas ntsuas diode nrog multimeter
Diodes yuav tsum tau ntsuas nrog lub diode ntau ntawm lub multimeter. Tig lub iav ntawm multimeter mus rau lub diode iav, ntxig cov hlau kuaj liab mus rau qhov zoo kawg, thiab cov xim dub coj mus rau qhov tsis zoo kawg.
Siv cov hlau kuaj liab thiab cov xim dub coj los kov ob lub electrodes ntawm diode nyob rau hauv kev sim. Yog hais tias lub diode qhia tau hais tias qhov hluav taws xob poob ntawm li 0.7V, nws txhais tau hais tias qhov kawg kov los ntawm cov hlau kuaj liab yog tus ncej zoo ntawm diode, thiab sab nraud yog tus ncej tsis zoo ntawm lub diode.
Hloov cov kev taw qhia ntawm diode nyob rau hauv kev sim, yog tias tus nqi hluav taws xob tsis tuaj yeem ntsuas tau, nws txhais tau hais tias cov hlau kuaj liab yog nyob rau hauv kev sib cuag nrog cathode ntawm diode, thiab cov hlau lead dub yog nyob rau hauv kev sib cuag nrog lub anode ntawm lub diode.
Tom qab ob qho kev ntsuas saum toj no, qhov zoo thiab qhov tsis zoo ntawm cov diode tuaj yeem lees paub, thiab qhov zoo ntawm diode tuaj yeem lees paub.
Thaum lub digital multimeter nyob rau hauv hom tsis kam, qhov voltage ntawm ob qhov kev xeem coj mus rau qis qis, uas yog qis dua li qhov hluav taws xob txuas ntxiv mus txog ntawm 0.6-0.7V ntawm cov silicon diodes zoo tib yam, thiab cov diodes yog nyob rau hauv lub xeev txiav tawm. Tus nqi kuj nyob rau hauv lub xeev txiav tawm yog loj heev, yog li thaum ntsuas lub diode nrog ib tug digital multimeter, txawm nws yog rau pem hauv ntej los yog thim rov qab, lub tso tawm tus nqi overflows. Tag nrho cov multimeters muaj lub diode ntsuas iav, uas yuav tsum tau siv los ntsuas rau pem hauv ntej thiab thim rov qab rau-tawm ntawm diode.
Tsis tas li ntawd, lub diode yog cov khoom tsis muaj kab, thiab tus nqi kuj tsis raug kho. Thaum lub pem hauv ntej conduction tsis kam ntawm lub diode yog ntsuas nrog cov iav tsis kam ntawm tus pointer multimeter, nws tuaj yeem pom tias tus nqi tsis kam ntawm cov iav sib txawv yog qhov sib txawv heev. Yog li ntawd, nws tsis yog qhov tsim nyog los siv lub multimeter los ntsuas qhov ntsuas tus nqi ntawm lub diode. Tsuav qhov kev coj mus rau pem hauv ntej thiab thim rov qab tuaj yeem ntsuas tau, lossis cov ncej zoo thiab qhov tsis zoo tuaj yeem raug qhov txawv, thiab seb puas muaj qhov tawg lossis hlawv, nws txaus. Tsis tas yuav tsum tau nyeem cov kev tawm tsam tshwj xeeb.
Cov multimeter digital muaj cov ntaub ntawv ntsuas diode rau kev ntsuas diodes. Yog tias koj yuav tsum tau siv cov ntaub ntawv tiv thaiv los ntsuas, lub diode muaj qhov tsis kam ntawm ntau tshaj kaum ntawm K nyob rau hauv qhov kev taw qhia rov qab, yog li lub 'meter' qhia tau hais tias muaj ntau dhau ntawm 1. Muaj ntau pua ohms mus rau ob peb K nyob rau hauv kev taw qhia pem hauv ntej, vim hais tias tus nqi kuj sib txawv vim hais tias qhov voltage thov rau ob qho kawg ntawm semiconductor diode yog txawv. Yog li ntawd, lub diode feem ntau yog ntsuas nrog cov ntaub ntawv tshwj xeeb. Qhov thim rov qab feem ntau yog 1 (dhau), thiab pem hauv ntej yog nruab nrab ntawm 300--750 (qhov no yog qhov tseeb qhov poob qis). Feem ntau ntawm lawv yog nyob ib ncig ntawm 600 (silicon) thiab qis dua 500 (germanium) hlab.
