Digital multimeter rau kev tshawb pom ntawm diode-on voltages
Hauv cov iav no, tus cwj mem liab txuas nrog lub zog zoo sab hauv ntawm multimeter, thiab tus cwj mem dub txuas nrog lub zog tsis zoo ntawm lub multimeter. Kev sib txuas ntawm ob tus cwj mem thiab lub diode. Yog hais tias ntsuas raws li txoj kev sib txuas, qhov ntsuas diode yog ua, lub multimeter qhia lub diode qhov zoo conduction voltage, chav tsev yog mV. feem ntau zoo silicon diode zoo conduction voltage yuav tsum yog 500mV ~ 800mV, zoo germanium diode zoo conduction voltage yuav tsum yog 200mV ~ 300mV. yog tias "000" tshwm sim, nws txhais tau hais tias lub diode tawg thiab luv-circuits, yog tias "000" tshwm sim, nws txhais tau hais tias lub diode tawg. Yog tias "000" tshwm sim, nws txhais tau hais tias lub diode yog luv luv, yog tias "1" tshwm sim, nws txhais tau hais tias lub diode tsis muaj nyob rau pem hauv ntej. Yog tias "1" tshwm sim, nws txhais tau hais tias lub diode yog inverse cut-off, thiab yog tias "000" los yog lwm yam tseem ceeb tshwm sim, nws txhais tau hais tias lub diode tau inverse breakdown. Cov ntaub ntawv no tuaj yeem siv los txiav txim siab qhov zoo thiab tsis zoo triode thiab tus lej cim. Kev ntsuas, thawj tus cwj mem txuas nrog tus pin uas tau txheeb xyuas, lwm tus cwj mem txuas txuas txuas ntxiv mus rau ob tus pins ntxiv, yog tias ntsuas ob zaug nyob rau lossis tsis nyob, thiab tom qab ntawd hloov ob tus cwj mem thiab ntsuas, ob qho tib si tsis nyob lossis nyob rau. , nws tuaj yeem txiav txim siab tias qhov transistor zoo, thiab tuaj yeem txiav txim siab tias tus pin txheeb xyuas yog lub hauv paus ntawm lub transistor. Yog tias tus cwj mem liab txuas nrog lub hauv paus, tus cwj mem dub tau txuas nrog rau lwm tus ncej yog nyob rau, ces lub transistor yog NPN-hom, thiab rov qab, yog PNP-hom. Thaum kawg, sib piv qhov loj ntawm ob lub PN junction zoo conduction voltage, kev nyeem ntawv yog qhov loj dua, qhov kev nyeem ntawv yog me me bc junction, yog li cov neeg sau thiab emitter raug txheeb xyuas.
