Yuav ua li cas siv multimeter los ntsuas qhov zoo ntawm transistors
Ua ntej, siv "diode thiab beep on / off" iav ntawm lub tshuab hluav taws xob digital los txiav txim siab qhov zoo ntawm transistor thiab seb nws yog hom PNP lossis NPN.
① Teem lub digital multimeter mus rau qhov "Diode Test" txoj hauj lwm, ntxig lub xov tooj liab rau hauv (V Ω) qhov (socket), thiab cov kev sojntsuam dub rau hauv lub qhov (COM). Rau qhov kev sojntsuam liab txuas nrog ib tus pin, yog tias qhov ntsuas qhov tseem ceeb ntawm lwm tus pins yog 611 Ω lossis 614 Ω, nws qhia tau tias qhov ntsuas ntsuas ntsuas yog NPN hom transistor. Tus nqi resistor ntawm 611 Ω yog ob peb ohms qis dua cov khoom ntawm lub transistor, thiab tus nqi resistor ntawm 614 Ω yog lub emitter ntawm lub transistor. Ntawm qhov tsis sib xws, qhov kev sojntsuam dub ntawm digital multimeter txuas nrog ib qho ntawm lwm ob tus pins ntawm lub transistor nrog qhov tsis kam ntawm ib ncig ntawm 600 Ω yog PNP hom transistor, lossis yog qhov qis dua tus pin lub collector ntawm transistor thiab siab dua. pin lub emitter.
Yog hais tias peb tus pins raug ntsuas nrog liab thiab dub sojntsuam, ib tug transistor nrog ib tug tsis kam ntawm 600 Ω ntsuas tsis tau, thiab nws yog xam tias yog faulty. Yog tias qhov ntsuas qhov ntsuas tsis zoo yog tsawg dua 600 Ω, uas yog ntau dhau lossis xoom, nws ua pov thawj tias qhov transistor no tsis raug.
Qee lub sij hawm, txawm hais tias tus nqi tsis kam ntawm lub transistor tuaj yeem ntsuas nyob ib puag ncig 600 Ω, nws yog ib qho tsim nyog yuav tsum siv lub tshuab multimeter los ntsuas qhov ntsuas rau pem hauv ntej thiab thim rov qab qhov tseem ceeb ntawm cov emitter thiab collector. Rau qhov tsis zoo ntawm cov transistor, qhov tseem ceeb ntawm qhov tsis kam ntawm e → c thiab c → e yog infinity, txwv tsis pub nws ua pov thawj tias muaj teeb meem nrog lub transistor.
Nco ntsoov; Tsuas yog diodes nrog damping thiab puag thiab emitter nrog damping resistors.
② Rau qhov txiav txim siab PNP lossis NPN transistor, lub tshuab hluav taws xob digital tuaj yeem rub mus rau hFE txoj haujlwm, uas yog lub qhov (socket) rau kev ntsuas hluav taws xob qis. Ntxig peb tus pins ntawm lub transistor nrog cov lej sib raug, thiab cov digital multimeter yuav tso saib qhov ua kom pom tseeb ntawm qhov ntsuas transistor.
