Vim li cas cov digital multimeter kuj iav diode rau pem hauv ntej thiab thim rov qab tsis qhia qhov tseem ceeb
Lub unidirectional conducting yam ntxwv ntawm ib tug diode yog nyob rau hauv lub fact tias PN hlws ris ntawm lub diode yog rau pem hauv ntej biased ua ntej nws ua. 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. Multimeter diode iav yog nrog voltage feem ntau yog 1.5-2.8V los yog li ntawd, nyob rau hauv kev ntsuas lub diode yog tiag tiag qhov voltage ntawm ob sab ntawm lub diode, kom lub PN hlws ris rau pem hauv ntej bias, uas yog nyob rau hauv lub multimeter saib ib qho hluav taws xob poob ntawm 0.7V los yog li ntawd, 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.
Multimeter diode ntsuas txoj kev
Lub diode yuav tsum tau ntsuas nrog lub diode iav ntawm lub multimeter. Ntaus lub multimeter lub iav mus rau lub diode iav, tus cwj mem liab yog muab tso rau hauv qhov zoo kawg, thiab tus cwj mem dub tau muab tso rau hauv qhov tsis zoo kawg.
Hu rau ob lub electrodes ntawm ntsuas diode nrog cov cwj mem liab thiab dub, thiab yog tias lub diode pom qhov hluav taws xob poob ntawm txog 0.7V, nws txhais tau tias qhov kawg tiv tauj los ntawm tus cwj mem liab yog tus ncej zoo ntawm lub diode. , thiab lwm sab yog tus ncej tsis zoo ntawm lub diode.
Hloov cov kev taw qhia ntawm qhov ntsuas diode, yog tias tus nqi hluav taws xob tsis ntsuas, nws txhais tau tias tus cwj mem liab yog kov tus ncej tsis zoo ntawm diode thiab tus cwj mem dub yog kov tus ncej zoo ntawm lub diode.
Tom qab ob qho kev ntsuas saum toj no, koj tuaj yeem paub meej tias lub diode qhov zoo thiab qhov tsis zoo, thiab tuaj yeem paub meej tias lub diode zoo lossis phem.
Digital multimeter nyob rau hauv cov ntaub ntawv tsis kam, qhov voltage ntawm ob lub cwj mem yog qis, qis dua li cov silicon diode zoo tib yam 0.6-0.7V los yog zoo conduction voltage, lub diode nyob rau hauv lub xeev txiav tawm. . Tus nqi tsis kam ntawm lub xeev txiav tawm yog qhov loj heev, yog li thaum ntsuas lub diode nrog digital multimeter, txawm tias nws yog pem hauv ntej lossis thim rov qab, nws qhia tau tias tus nqi dhau. Digital multimeter muaj diode ntsuas iav, koj yuav tsum siv iav los ntsuas lub diode rau pem hauv ntej thiab thim rov qab rau thiab tawm.
Tsis tas li ntawd, lub diode yog ib qho tsis-linear tivthaiv, tus nqi kuj tsis tas, thaum lub pointer multimeter kuj cov ntaub ntawv los ntsuas lub diode rau pem hauv ntej conduction kuj, nws yuav pom, qhov sib txawv ntawm cov ntaub ntawv sib txawv kuj muaj nuj nqis heev. Yog li ntawd, kev ntsuas ntawm diode kuj tus nqi nrog ib tug multimeter tsis yog ib qho tseem ceeb, tsuav yog qhov kev ntsuas ntawm pem hauv ntej conduction, rov qab txiav tawm, los yog txheeb xyuas qhov zoo thiab tsis zoo ncej, kom paub qhov tawg los yog burnt tawm ntawm kab, muaj. tsis tas yuav tsum tau nyeem cov nqi tiv thaiv tshwj xeeb.
Digital multimeter muaj cov ntaub ntawv tshwj xeeb theem nrab siv los ntsuas lub diode. Yog tias koj yuav tsum siv cov ntaub ntawv tiv thaiv, lub diode thim rov qab kaum ntawm K lossis ntau dua tus nqi tiv thaiv, yog li cov lus qhia pom dhau 1. Xa mus rau ob peb puas ohms mus rau ob peb K, vim hais tias cov semiconductor diode voltage ntxiv rau qhov kawg ntawm qhov sib txawv kuj. cov nqi sib txawv. Yog li ntsuas lub diode feem ntau ntsuas nrog cov ntaub ntawv tshwj xeeb, thim rov qab feem ntau yog 1 (dhau), pem hauv ntej ntawm 300 - 750 (qhov no yog qhov tseeb qhov poob qis), feem ntau nyob rau hauv rau pua los yog li ntawd (silicon), 500 los yog tsawg dua. (germanium) tube.
