Qhov no yog li cas koj tuaj yeem kuaj lub transistor nrog multimeter
Ua ntej tshaj plaws, cov khoom siv digital multimeter "diode thiab buzzer" iav los txiav txim siab qhov zoo thiab qhov tsis zoo ntawm transistors thiab transistors yog PNP-hom lossis NPN-hom.
① digital multimeter hu rau "diode test" iav, tus cwj mem liab rau hauv (VΩ) jack, tus cwj mem dub rau hauv (COM) jack. Rau tus cwj mem liab nkag mus rau ko taw, lwm qhov ob txhais taw tsis kam tus nqi ntawm 611 Ω lossis 614 Ω, nws tau hais tias lub sijhawm no qhov kev ntsuas ntawm triode rau NPN-hom raj, 611 Ω ob peb tus nqi kuj me me ntawm cov khoom siv. ntawm lub triode, 614 Ω ntawm lub emitter ntawm lub triode teeb. Hloov pauv, tus cwj mem dub ntawm digital multimeter txuas nrog ko taw thiab qhov tseeb ob txhais taw yog nyob rau hauv 600Ω lossis yog li ntawm triode rau PNP-hom triode, lossis tus nqi tsis kam ntawm ib ko taw me me rau cov khoom siv ntawm triode, me ntsis ntawm tus nqi kuj rau lub emitter.
Yog hais tias peb taw nrog liab thiab dub cwj mem ntsuas, yuav ua li cas ntsuas tsis tau 600Ω kuj tus nqi ntawm lub triode, nws yog phem. Yog tias qhov ntsuas qhov ntsuas tsis zoo tsawg dua 600Ω ntau dhau lossis xoom, ua pov thawj tias triode tsis zoo.
Qee lub sij hawm txawm hais tias lawv tuaj yeem ntsuas tus nqi tsis kam ntawm lub triode ntawm 600Ω lossis yog li ntawd, lub sijhawm no kuj yuav tsum siv lub multimeter los ntsuas cov emitter thiab cov khoom sib sau ua ntej thiab thim rov qab tus nqi ntawm lawv, tsis zoo triode, e → c, c → e tus nqi kuj yog ∞ infinity, txwv tsis pub ua pov thawj tias lub triode muaj lus nug los hais.
Nco tseg; rau band damping diode thiab puag thiab emitter nrog damping kuj tshwj tsis yog.
② Rau kev txiav txim siab zoo ntawm PNP lossis NPN triode, lub sijhawm no koj tuaj yeem rub cov digital multimeter mus rau hFE thaiv, qhov thaiv no tau mob siab rau kev ntsuas ntawm lub zog qis triode jack. Ntxig peb ceg ntawm lub triode rau hauv tus lej raug, lub sijhawm no cov multimeter digital yuav qhia qhov kev nthuav dav ntawm triode ntsuas.
