Ntawm multimeter, HFE txhais li cas?
HFE cov ntaub ntawv ntawm lub multimeter yog ntsuas cov siv lead ua transistor tam sim no amplification, thiab muaj cov sockets rau ntsuas cov siv lead ua transistor ntawm no hom 'meter'. hFE cov ntaub ntawv feem ntau yog siv los ntsuas qhov amplification ntawm -value, thiab ua ntej ntsuas, nws yuav tsum tau txiav txim siab tias lub transistor yog PNP lossis NPN hom, thiab tib lub sijhawm, nws yuav tsum txiav txim siab tias polarity ntawm txhua tus pin.
Kev Siv: Ntxig lub transistor rau hauv qhov sib thooj polarity thaum ntsuas, thiab koj tuaj yeem nyeem qhov tam sim no amplification ntawm transistor.
Lub taub hau multimeter yog ib qho rhiab ammeter. Lub dial ntawm lub taub hau yog luam tawm nrog ntau yam cim, nplai kab thiab tus lej muaj nuj nqis. Lub cim A a V a Ω qhia tias lub 'meter' yog ntau lub 'meter' uas tuaj yeem ntsuas tam sim no, voltage thiab tsis kam.
Lub dial yog luam tawm ntawm ntau qhov teev, sab xis kawg ntawm qhov cim "Ω" yog qhov ntsuas tsis sib haum, sab xis kawg yog xoom, sab laug kawg ntawm ∞, kev faib tawm ntawm qhov ntsuas qhov tsis sib xws. Lub cim "-" lossis "DC" rau qhov ncaj qha tam sim no, "~" lossis "AC" qhia AC, thiab "~" qhia txog kab sib faib los ntawm AC thiab DC. Ob peb kab ntawm cov lej nyob rau hauv kab kab yog qhov ntsuas qhov tseem ceeb sib xws rau qhov sib txawv zog ntawm tus xaiv hloov.
Multimeter txoj haujlwm ua haujlwm:
Lub hauv paus ntsiab lus ntawm multimeter yog siv lub rhiab magneto-electric DC ammeter (microammeter) ua lub taub hau meter. Thaum ib tug me me tam sim no hla lub taub hau, ib tug tam sim no qhia. Txawm li cas los xij, lub taub hau tsis tuaj yeem hla cov tam sim no loj, yog li qee qhov kev tiv thaiv yuav tsum tau txuas nrog nyob rau hauv parallel thiab series ntawm lub taub hau kom shunt los yog nqis mus rau qhov voltage, yog li ntsuas qhov tam sim no, voltage thiab tsis kam nyob rau hauv Circuit Court.
Multimeter ntawm hfe, PNP, NPN, lawv txhais li cas?
HFE yog lub triode DC tam sim no amplification yam abbreviation, yog lub triode tam sim no amplification; PNP thiab NPN yog sawv cev ntawm ob hom triodes.
Triode conduction IE = (amplification +1) * IB and ICB has no relationship, ICB = 0 ICB> 0, there may be a problem with the triode, so the triode in normal operation, regardless of whether it is working in the amplification or saturation ICB = 0. When UEB>{{0}}.7V (silicon) (germanium 0.2V), RC/RB < amplification, lub triode ua haujlwm nyob rau hauv cheeb tsam saturation, thiab vice versa, ua hauj lwm nyob rau hauv lub amplification cheeb tsam. Hauv cheeb tsam amplification.
Qhov sib txawv ntawm PNP-hom triode thiab NPN-hom triode yog tias cov kev taw qhia ntawm ob PN junctions tsis zoo ib yam.
PNP yog ib hom cathode, uas yog, ob lub PN junction N junction txuas nrog lub hauv paus, lwm qhov ob P junction collector thiab emitter; Daim duab kab kos tau sau tias yog xub xub sab hauv triode, NPN yog qhov sib txawv.
