Kuv tuaj yeem siv ntau dua ntawm multimeter?
Rau cov neeg nyeem thiab cov neeg tsim qauv, nws tsis yog ib qho teeb meem uas yuav tsum tau siv lub multimeter los ntsuas lub triode pins, tab sis qhov tseeb, lub multimeter tsis tuaj yeem ntsuas lub triode xwb, tab sis kuj txiav txim siab txog kev ua haujlwm ntawm triode. Cov teeb meem cuam tshuam tau piav qhia meej.
Piv txwv li, yog tias lub hwj chim amplifier tsis muaj qhov tso tawm, thiab ib qho ntawm cov triodes siv lub multimeter los ntsuas qhov voltage ntawm lub hauv paus thiab emitter li 0V ( ntsuas ntawm lub rooj tsav xwm Circuit Court), puas txhais tau tias lub triode yog puas lawm? Kev txiav txim los ntawm cov xwm txheej muab, nws tsis tuaj yeem txiav txim siab tias triode tawg raws li cov ntaub ntawv uas twb muaj lawm. Muaj ob lub ntsiab lus yuav tsum tau muab sau tseg ntawm no: qhov tso zis ntawm lub hwj chim amplifier xyuas kom meej seb lub triode yog siv los ua lub amplifier los yog lub raj hloov. Tsis tas li ntawd, yog tias nws yog siv los ua lub suab nrov, ces koj yuav tsum xub xyuas qhov kev tsis ncaj ncees ntawm lub raj (yog tias tsis muaj kev tsis ncaj ncees, lub hauv paus ntawm lub raj yuav tsum tsis zoo thaum nws ua haujlwm ib txwm).
So can a multimeter be used to judge whether the triode on the circuit board is good or bad? What will the voltage of each pole of the triode work in different stages such as amplification, saturation, and cut-off? Obviously, this method is for reference only. It is also necessary to detect the online resistance after power-off or even remove the triode and use a multimeter to detect it again. As for the voltage of each pole of the triode, in the enlarged state: Uc>Ub>Ue (PNP) or (Ue>Ub>Uc (NPN), nyob rau hauv lwm yam lus, lub emitter junction yog rau pem hauv ntej-biased thiab cov collector junction yog rov qab-biased. Saturated xeev: emitter junction rau pem hauv ntej bias; collector junction forward bias. Kev txiav tawm ntawm lub xeev: emitter junction thim rov qab bias; collector junction rov qab bias. Qhov tshwj xeeb voltage yog txiav txim siab raws li qhov xwm txheej tiag tiag, tab sis cov xwm txheej saum toj no yuav tsum tau ua kom tiav.
Cia peb tham luv luv txog txoj kev ntsuas lub triode nrog multimeter. Ua ntej ntawm tag nrho cov, tsis muaj disconnecting lub Circuit Court, koj muaj peev xwm ncaj qha siv cov ntaub ntawv voltage ntawm lub multimeter los txiav txim seb lub xeev lub transistor nyob rau hauv.
Ntsuas qhov voltage ntawm lub collector thiab lub emitter, uas yog hais txog {{0}}.3 ~ 0.6v thiab nyob rau hauv ib tug saturated lub xeev.
Ntsuas qhov voltage ntawm lub collector thiab lub emitter, uas yog yuav luag sib npaug ntawm lub hwj chim mov voltage thiab nyob rau hauv ib tug txiav-tawm lub xeev.
Ntsuas qhov voltage ntawm lub collector thiab lub emitter, nruab nrab ntawm 1.
Qhov hluav taws xob nruab nrab ntawm lub hauv paus thiab lub emitter yog 0, tab sis nws tsis paub meej tias lub triode puas tau nyob rau lub sijhawm no, thiab nws yuav tsum tau soj ntsuam raws li qhov xwm txheej tshwj xeeb.
Kuv vam tias tom qab nyeem tsab xov xwm no, koj tuaj yeem paub qee cov tswv yim ntawm kev siv multimeter rau kev ntsuas triode, thiab cov txheej txheem tsim yuav zoo dua.
