Dab tsi yog hFE ntawm multimeter
hFE yog ib chav ntsuas ntsuas los txiav txim qhov nce tam sim no (lossis nce) uas lub transistor tuaj yeem muab tau. Hauv lwm lo lus, hFE yog qhov sib piv ntawm cov khoom siv tam sim no thiab cov khoom tso tawm tam sim no, thiab tuaj yeem siv los txiav txim siab seb qhov twg haum ib qho transistor rau ib lub voj voog lossis daim ntawv thov.
hFE ntawm ib lub multimeter yog ib qho tseem ceeb uas ntsuas qhov nce lossis txo qhov voltage ntawm ob lub ntsiab lus, hauv lwm lo lus, "tus nqi hFE ntawm ib lub multimeter qhia tias tam sim no lub transistor tuaj yeem ua haujlwm ntau npaum li cas ua ntej nws pib kub thiab poob." Piv txwv li: thaum lub input tam sim no yog ib volt ntawm point A thiab ib amp ntawm input tam sim no ntawm point B, cov zis voltage yuav yog ib amp zaug ib volt zaus hFE. Yog tias hFE yog 10, cov zis tam sim no yuav yog kaum amps.
hFE txhais
Txhawm rau rhuav tshem qhov kev sib npaug no, peb tuaj yeem pom tias Ic yog "cov khoom sau tam sim no" thiab Ib yog "piv tam sim no". Thaum ob nqe lus no tau muab faib ua ke, peb tau txais qhov nce tam sim no ntawm transistor, feem ntau hu ua hFE.
hfe txhais li cas?
hFE stands rau "Hybrid Direct Emitter". Nws tseem hu ua "forward beta" hauv qee kis. Lub sij hawm los ntawm qhov tseeb tias qhov piv ntawm nws sawv cev yog kev sib xyaw ntawm ob qhov kev ntsuas sib txawv: tshwj xeeb hauv paus tam sim no tsis kam thiab emitter tam sim no tsis kam. Lawv tau muab faib ua ke los tsim qhov peb paub ua hFE.
Qhov kuaj hFE yog dab tsi?
Kev ntsuas ntsuas qhov nce (lossis nce) ntawm lub transistor. Gain yog txhais raws li qhov piv ntawm cov teeb liab tso zis rau lub teeb liab input. Nws kuj yog feem ntau hu ua "beta" (β). Lub transistor ua raws li amplifier, nce qhov tam sim no los yog voltage ntawm nws cov zis txheeb ze rau nws cov tswv yim, thaum tuav ib tug tas li tso zis impedance. Txhawm rau txiav txim siab seb lub transistor puas ua tau zoo hauv daim ntawv thov, nws qhov nce yuav tsum tau sim thiab muab piv rau qhov xav tau rau daim ntawv thov ntawd. (1)
HFE xam li cas?
hFE yog xam los ntawm kev sib piv lub hauv paus tam sim no thiab cov khoom siv tam sim no. Ob qhov tam sim no tau muab piv nrog cov transistor tester uas tso cai rau koj los ntsuas cov transistor hauv nqe lus nug. Tus transistor tester tuav lub hauv paus tam sim no nyob rau theem tas li thiab tom qab ntawd ntsuas cov khoom siv tam sim no ntws los ntawm nws. Thaum koj muaj ob qhov kev ntsuas no, koj tuaj yeem suav hFE.
Txawm li cas los xij, muaj ob peb qhov tseem ceeb rau txoj kev kuaj koj cov transistors. Piv txwv li, koj yuav tsum paub tias yog tias koj ntsuas ib pawg ntawm cov transistors ua ke, lawv yuav cuam tshuam rau ib leeg kev nyeem ntawv. Qhov no txhais tau hais tias yog tias koj xav ntsuas qhov tseeb ntawm hFE qhov tseem ceeb ntawm koj cov transistors, nws yog qhov zoo tshaj los sim lawv ib zaug. Txawm hais tias qhov no tuaj yeem ua rau qeeb ntawm cov txheej txheem kuaj, nws kuj ua kom qhov tseeb ntawm cov txiaj ntsig.
tswv yim pom zoo
(1) Beta - https://economictimes.indiatimes.com/definition/beta
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