HFE txhais li cas ntawm multimeter
HFE cov ntaub ntawv nyob rau hauv multimeter yog siv los ntsuas qhov tam sim no magnification ntawm cov siv lead ua triode, thiab tag nrho cov meters no muaj sockets rau ntsuas lub transistor. Cov ntaub ntawv hFE feem ntau yog siv los ntsuas tus nqi magnification. Ua ntej kev ntsuas, nws yuav tsum tau txiav txim siab seb lub triode yog PNP lossis NPN, thiab tib lub sijhawm txiav txim siab polarity ntawm txhua tus pin.
Yuav siv li cas: Thaum ntsuas, ntxig lub triode rau hauv qhov sib thooj polarity jack, thiab tom qab ntawd koj tuaj yeem nyeem qhov kev nthuav dav tam sim no ntawm triode.
Cov ntaub ntawv txuas ntxiv:
Lub taub hau ntawm multimeter yog rhiab heev galvanometer. Lub dial ntawm lub taub hau yog luam tawm nrog ntau yam cim, nplai cov cim thiab qhov tseem ceeb. Lub cim AV-Ω qhia tias ammeter yog multimeter uas tuaj yeem ntsuas tam sim no, voltage thiab tsis kam.
Muaj ntau lub nplai kab luam tawm ntawm lub xov tooj, cov uas ib qho cim nrog "Ω" ntawm sab xis yog cov kab hluav taws xob tsis sib haum, sab xis kawg yog xoom, sab laug kawg yog ∞, thiab qhov ntsuas tus nqi faib tsis sib npaug. Lub cim "-" lossis "DC" txhais tau hais tias ncaj qha tam sim no, "~" lossis "AC" txhais tau tias hloov pauv tam sim no, thiab "~" txhais tau tias cov kab sib faib los ntawm AC thiab DC. Ob peb kab ntawm tus lej nyob rau hauv kab kab yog qhov ntsuas qhov tseem ceeb sib raug rau cov haujlwm sib txawv ntawm tus xaiv hloov.
Yuav ua li cas lub multimeter ua haujlwm:
Lub hauv paus ntsiab lus ntawm multimeter yog siv lub rhiab magnetoelectric DC ammeter (microampere meter) ua lub taub hau meter. Thaum ib qho me me tam sim no dhau los ntawm lub taub hau meter, yuav muaj qhov qhia tam sim no. Txawm li cas los xij, lub taub hau 'meter' tsis tuaj yeem dhau qhov tam sim no loj, yog li qee qhov kev tiv thaiv yuav tsum tau txuas nrog nyob rau hauv parallel los yog series ntawm lub taub hau 'meter' kom shunt los yog txo qhov voltage, thiaj li ntsuas qhov tam sim no, voltage thiab kuj nyob rau hauv Circuit Court.
Hfe, PNP, NPN ntawm multimeter txhais li cas?
HFE yog cov ntawv luv ntawm qhov ncaj qha tam sim no amplification yam ntawm triode, uas yog tam sim no magnification ntawm triode; PNP thiab NPN sawv cev rau ob hom triodes.
When the triode is turned on, IE=(magnification +1)*IB has nothing to do with ICB. When ICB=0 ICB>0, there may be a problem with the triode, so when the triode is working normally, whether it is working in the amplification area or the saturation area ICB =0. When UEB>{{0}}.7V (silicon) (germanium 0.2V), RC/RB
Qhov sib txawv ntawm PNP transistor thiab NPN transistor yog tias cov lus qhia ntawm ob lub PN junctions tsis sib haum.
PNP yog ib hom cathode, uas yog, N junctions ntawm ob lub PN junctions yog kev cob cog rua raws li lub hauv paus, thiab lwm yam ob P junctions yog siv raws li lub collector thiab emitter feem; daim duab kab kos yog cim raws li ib tug triode nrog ib tug xub tig rau sab hauv. NPN yog qhov opposite.
