Txoj kev ntsuas semiconductor nrog multimeter
1. Diodes
Qhov qhib hluav taws xob hluav taws xob ntawm lub diode iav ntawm digital multimeter yog hais txog 2.8V, cov hlau kuaj liab txuas nrog qhov zoo, thiab cov hlau lead dub txuas nrog qhov tsis zoo. Thaum ntsuas, qhov tam sim no yog kwv yees li 1mA, thiab tus nqi tso tawm yog kwv yees tus nqi ntawm lub zog pem hauv ntej ntawm lub diode, thiab chav tsev yog mV los yog V. Qhov hluav taws xob pem hauv ntej poob ntawm silicon diode yog hais txog 0. 3 ~ 0.8V. Lub zog hluav taws xob rau pem hauv ntej poob ntawm germanium diode germanium yog li ntawm 0.1 ~ 0.3V. Thiab rau pem hauv ntej voltage poob ntawm lub diode nrog lub zog siab dua yog me dua. Yog tias qhov ntsuas tus nqi tsawg dua 0.1V, nws txhais tau hais tias lub diode tau tawg, thiab ob qho tib si rau pem hauv ntej thiab thim rov qab. Yog tias ob qho tib si rau pem hauv ntej thiab rov qab qhib, nws txhais tau hais tias PN kev sib tshuam ntawm lub diode qhib. Rau lub teeb-emitting diodes, lub diode emits lub teeb thaum ntsuas rau pem hauv ntej kev taw qhia, thiab lub raj voltage poob yog hais txog 1.7V.
2. Transistor
Lub triode muaj ob ntu PN, seem emission (be) thiab seem collector (bc), uas tuaj yeem ntsuas raws li txoj kev ntsuas diode. Nyob rau hauv qhov tseeb ntsuas, lub pem hauv ntej thiab rov qab voltage poob yuav tsum tau ntsuas ntawm txhua txhua ob pins, ib tug tag nrho ntawm 6 lub sij hawm, ntawm uas 4 zaug pom qhib Circuit Court, thiab tsuas yog 2 lub sij hawm qhia qhov voltage poob nqi, txwv tsis pub lub triode yog phem los yog ib tug. tshwj xeeb triode (xws li band-stop triodes, Darlington triodes, thiab lwm yam., tuaj yeem txawv ntawm cov triodes zoo tib yam los ntawm cov qauv). Hauv ob qhov kev ntsuas nrog qhov tseem ceeb, yog tias qhov ntsuas dub los yog cov hlau kuaj liab txuas nrog tib tus ncej, ces tus ncej no yog lub hauv paus, tus nqi ntsuas me me yog qhov sib sau, thiab qhov loj dua yog qhov emitter node, vim tias lub hauv paus tau raug txiav txim, Cov ntawv xov xwm tuaj yeem txiav txim siab tus neeg sau thiab emitter. Nyob rau tib lub sijhawm, nws tuaj yeem txiav txim siab: yog tias qhov kev ntsuam xyuas dub tau txuas nrog tib tus ncej, lub triode yog PNP hom; yog tias qhov kev ntsuam xyuas liab txuas nrog tib tus ncej, lub triode yog NPN hom; lub silicon tube nrog ib tug voltage poob ntawm txog 0.6V yog ib tug silicon raj, thiab ib tug nrog ib tug voltage poob ntawm txog 0.2V yog ib tug germanium raj. Tube.
Peb, thyristor:
Lub anode, cathode thiab tswj electrode ntawm thyristor yog qhib-circuited, raws li tus pin anode tuaj yeem txiav txim siab thiab seb lub thyristor puas tuaj yeem raug txiav txim. Kuj tseem muaj PN kev sib tshuam ntawm cov tswj hluav taws xob thiab cov cathode ntawm thyristor, tab sis muaj kev tiv thaiv tiv thaiv ntawm kev tswj electrode thiab cathode ntawm lub zog siab thyristor, thiab cov nqi tso tawm yog qhov hluav taws xob poob ntawm qhov tsis kam thaum ntsuas. .
4. Optocoupler
Ib sab ntawm lub optocoupler yog lub teeb-emitting diode, qhov hluav taws xob poob yog li 1V thaum ntsuas, thiab sab nraud yog triode, qee qhov tsuas yog coj tawm c thiab e, thiab cov lus qhia zoo thiab tsis zoo ntawm kev ntsuas raug txiav tawm. Yog tias tag nrho peb tus pins raug coj tawm, cov yam ntxwv ntsuas yog tib yam li saum toj no triode (feem ntau NPN raj). Thaum ib tug multimeter yog siv los ua tus diode coj mus tom ntej, lub sij hawm no, lwm multimeter yog siv los ntsuas qhov conduction voltage poob ntawm triode c rau e, uas yog hais txog 0.15V; disconnect lub multimeter txuas nrog lub diode, thiab triode c rau e raug txiav tawm, qhia tias optocoupler zoo
