Kev ntsuas kev ua haujlwm ntawm Transistor nrog Multimeter
Piv txwv li, yog hais tias lub hwj chim amplifier tsis muaj cov zis thiab ib qho ntawm lawv tsuas yog ntsuas qhov voltage ntawm lub hauv paus thiab emitter li 0V ( ntsuas ntawm lub rooj tsavxwm Circuit Court), nws puas txhais tau tias lub transistor puas lawm? Los ntawm cov xwm txheej muab, nws tsis tuaj yeem txiav txim siab seb lub transistor puas yog raws li cov ntaub ntawv uas twb muaj lawm. Ob lub ntsiab lus yuav tsum tau muab sau tseg: lub hwj chim amplifier tso zis xyuas kom meej seb lub transistor yog siv raws li ib tug amplifier los yog ib tug hloov transistor. Tsis tas li ntawd, yog tias nws yog siv los ua ib qho amplifier, lub bias Circuit Court ntawm transistor yuav tsum tau kuaj ua ntej (yog tias tsis muaj qhov tsis ncaj ncees lawm Circuit Court, lub hauv paus ntawm transistor yuav tsum tsis zoo thaum ua haujlwm ib txwm).
Can a multimeter be used to determine the quality of transistors on a circuit board? What is the voltage at each pole of a transistor during different stages such as amplification, saturation, and cutoff? Obviously, this method can only be used as a reference. It is also necessary to cut off the power and test the online resistance, or even remove the multimeter from the transistor for retesting. As for the voltage at each pole of the transistor, in the amplified state: Uc>Ub>Ue (PNP) or (Ue>Ub>Uc (NPN), nyob rau hauv lwm yam lus, lub emitter junction yog zoo biased thiab cov collector junction yog tsis zoo biased. Txaus siab hais tias: Launch junction yog zoo biased; Lub collector junction yog zoo biased. Txiav tawm lub xeev: tso tawm kev sib tshuam rov qab kev tsis ncaj ncees; Lub collector junction yog rov qab biased. Qhov tshwj xeeb voltage nyob ntawm qhov xwm txheej tiag tiag, tab sis nws yuav tsum tau ua raws li cov xwm txheej saum toj no.
Cia peb tham luv luv txog txoj kev ntsuas ntawm multimeter rau transistor. Ua ntej, yam tsis muaj kev cuam tshuam lub Circuit Court, qhov voltage ntau ntawm multimeter tuaj yeem siv ncaj qha los txiav txim seb lub xeev twg lub transistor nyob hauv.
Ntsuas lub collector emitter voltage, uas yog kwv yees li ntawm 0.3 thiab 0.6 volts, thiab nyob rau hauv ib tug saturated lub xeev.
Ntsuas lub collector emitter voltage, uas yuav luag sib npaug rau qhov voltage thiab nyob rau hauv lub txiav -tawm lub xeev.
Ntsuas lub collector emitter voltage ntawm 1.0v thiab (lub hwj chim mov voltage-1) v, nyob rau hauv ntau yam amplification xeev.
Qhov voltage ntawm lub hauv paus thiab emitter yog 0, tab sis nws tsis tuaj yeem lees paub tias lub transistor puas nyob rau lub sijhawm no, thiab nws yuav tsum tau soj ntsuam raws li qhov xwm txheej tshwj xeeb.
