Siv ib tug multimeter los ntsuas lub pem hauv ntej kuj ntawm lub diode, yog vim li cas txhua iav
Cov multimeter digital ntsuas tus nqi tsis kam, hloov cov teeb liab analog rau hauv cov teeb liab digital siv A / D hloov dua siab tshiab nti, thiab tom qab ntawd qhia qhov tshwm sim. Lub taub hau sib nqus lub deflection yog li cas tus nqi qhia ntawm tus pointer multimeter. Kev ntsuas cov ntaub ntawv tiv thaiv ntawm lub diode tau txais tsis muaj qhov tseem ceeb nyob rau hauv pem hauv ntej thiab thim rov qab cov lus qhia, txawm li cas los xij lub pointer multimeter ntsuas ntawm tib lub diode yielded kuj nyob rau hauv pem hauv ntej kev taw qhia, feem ntau yog vim li cas hauv qab no:
Diode ntsuas hauv Circuit Boards
Ua ntej tshaj, piv rau digital multimeter, qhov tso zis voltage ntawm cov iav tiv thaiv ntawm tus pointer multimeter yog txawv. Tus pointer multimeter qhov siab tshaj plaws tso zis voltage feem ntau yog 9 volts, thaum lub siab tshaj plaws tso zis voltage ntawm ib tug multimeter yog feem ntau 3 volts. Lawv txawv tsis tau tsuas yog nyob rau hauv cov zis voltages, tab sis kuj nyob rau hauv lub ntsuas zog peb siv thiab nyob rau hauv cov zis voltages lawv tus kheej. Cov khoom siv digital multimeter's resistance iav muaj qhov tso zis voltage ntau ntawm 1.0 volts rau 3.0 volts. Thaum muab piv rau digital multimeter, qhov tso zis voltage ntawm cov iav tiv thaiv ntawm tus pointer multimeter feem ntau yog siab dua.
Thaum cov zis hluav taws xob ntau dua li qhov diode tus nqi poob qis, lub diode tuaj yeem tig rau. Txawm li cas los xij, thaum lub digital multimeter qhov voltage poob qis dua tus nqi diode tus nqi poob qis, lub diode tsis tuaj yeem qhib, uas ua rau tsis muaj qhov kawg rau pem hauv ntej thiab thim rov qab thaum ntsuas lub diode.
Nws raug nquahu kom xaiv lub diode iav thaum siv digital multimeter los ntsuas lub diode qhov zoo. Cov digital multimeter's diode iav feem ntau ua haujlwm ntawm 2.6 volts, uas yog siab dua li lub diode tus nqi hluav taws xob rau pem hauv ntej thiab ua rau lub diode tig rau pem hauv ntej.
Cov ntaub ntawv digital multimeter tuaj yeem siv los txiav txim seb lub diode puas los ntawm kev ntsuas qhov tsis kam. Hauv qhov no, qhov kev txiav txim siab yuav tsum yog tias tus nqi tiv thaiv nyob rau hauv kev ntsuas pem hauv ntej muaj tus nqi, whereas tus nqi kuj nyob rau hauv qhov kev ntsuas rov qab yog infinite. Kev ntsuas qhov tshwm sim los ntawm tus pointer multimeter kuj zoo ib yam. Nws yog pov thawj tias lub diode tuaj yeem tawm mus rau qhov sib txawv yog tias qhov ntsuas tau nthuav tawm qhov kev tawm tsam ntawm qhov sib txawv.Yuav pom nws hauv qhov piv txwv no, peb xav tau cov cuab yeej tshwj xeeb. Siv lub multimeter los txiav txim seb lub diode puas muaj qhov tsis raug. Qhov thib ob, vim hais tias cov yam ntxwv ntawm cov diodes sib txawv, kuj tseem yuav muaj qhov sib txawv ntawm cov txiaj ntsig ntawm kev ntsuas cov diodes siv lub tshuab hluav taws xob digital thiab qhov kev tiv thaiv ntau yam ntawm tus pointer multimeter.In sib piv, qee qhov tshwj xeeb diodes, xws li high-voltage diodes. , muaj qhov cuam tshuam loj heev ntawm qhov poob ntawm ntau tshaj 0.7 volts. Txij li thaum peb cov multimeter muaj qhov tsis tshua muaj hluav taws xob tsis zoo uas tsis tuaj yeem ua rau lub diode dhau, tus nqi kuj yuav tshwm sim tsis kawg thaum ntsuas. Piv txwv li, tus nqi hluav taws xob poob qis ntawm cov raj silicon thiab cov raj germanium yog 0.3 volts rau 0.6 volts.
