Yuav ua li cas kuaj xyuas thiab daws cov teeb meem hloov hluav taws xob hauv cov zaus hloov pauv?
Lub tshuab hluav taws xob digital hloov pauv qhov ntsuas ntsuas tus nqi mus rau hauv lub teeb liab digital los ntawm A / D hloov dua siab tshiab nti, thiab tom qab ntawd qhia tus nqi tsis kam. Tus pointer multimeter qhia tus nqi los ntawm deflecting lub taub hau sib nqus. Yog hais tias nyob rau hauv qhov tseeb kev ntsuas, peb pom tau hais tias siv ib tug multimeter los ntsuam xyuas cov kuj ntau yam ntawm ib tug diode tsis muaj nqi kuj nyob rau hauv ob qho tib si rau pem hauv ntej thiab rov qab cov lus qhia, thaum siv ib tug pointer multimeter los ntsuam xyuas tus nqi kuj ntawm ib tug diode muaj kuj nqi nyob rau hauv lub kev taw qhia pem hauv ntej, muaj cov laj thawj hauv qab no:
Diode ntsuas hauv Circuit Board
Ua ntej, qhov tso zis voltage ntawm qhov tsis kam ntawm tus pointer multimeter thiab digital multimeter sib txawv. Feem ntau, qhov siab tshaj plaws tso zis voltage ntawm tus pointer multimeter yog 9 volts, thaum lub digital multimeter feem ntau muaj qhov siab tshaj plaws qhov hluav taws xob ntawm 3 volts. Ntxiv mus, tsis tsuas yog lawv tso tawm qhov sib txawv voltages, tab sis thaum peb xaiv qhov sib txawv rau kev ntsuas, lawv cov zis voltage kuj txawv. Cov zis hluav taws xob ntawm qhov kev tiv thaiv ntau yam ntawm digital multimeter ranges ntawm 1.0 volts txog 3.0 volts. Cov zis hluav taws xob ntawm qhov tsis kam ntawm lub pointer multimeter feem ntau yog siab dua li ntawm digital multimeter. Cov zis hluav taws xob ntawm lub pointer multimeter yog ntau dua qhov voltage poob ntawm diode, thiab lub diode tuaj yeem ua tau. Qee lub sij hawm, lub tshuab hluav taws xob digital me dua qhov ntsuas hluav taws xob ntawm diode, ua rau lub diode tsis ua haujlwm. Qhov no tuaj yeem ua rau lub hauv ntej thiab thim rov qab los ntawm kev ntsuas diodes yog infinite.
Qhov thib ob, cov yam ntxwv ntawm kev poob qis ntawm theem ob ntawm transistor yog qhov sib txawv, uas tuaj yeem ua rau muaj kev sib txawv hauv cov txiaj ntsig ntawm kev ntsuas qhov thib ob theem transistor nrog lub pointer multimeter tsis kam ntau thiab siv digital multimeter los ntsuas qhov thib ob theem transistor. Piv txwv li, silicon thiab germanium transistors feem ntau muaj tus nqi poob qis ntawm {{{0}}}.3 volts thiab 0.6 volts, tab sis qee qhov tshwj xeeb theem ob transistors, xws li high-voltage diodes. , muaj ib tug conduction voltage poob ntawm feem ntau 0.7 volts los yog ntau tshaj. Peb cov multimeter digital muaj qhov qis dua qhov voltage thiab tsis tuaj yeem ua lub diode, yog li tus nqi tiv thaiv yuav tshwm sim tsis kawg thaum ntsuas.
Thaum ntsuas qhov zoo ntawm diode nrog lub digital multimeter, nws yog qhov zoo tshaj los xaiv lub diode iav. Lub diode iav ntawm lub tshuab hluav taws xob digital feem ntau yog nyob ib puag ncig 2.6 volts, uas feem ntau ntau dua li tus nqi hluav taws xob rau pem hauv ntej ntawm diode, thiab lub diode tuaj yeem coj mus rau pem hauv ntej.
Yog tias peb xav siv qhov kev tiv thaiv ntau yam los ntsuas seb puas muaj qhov xau hauv lub diode, peb tuaj yeem xaiv qhov kev tiv thaiv ntau ntawm digital multimeter. Lub sijhawm no, qhov tshwm sim yuav tsum yog kev ntsuas rau pem hauv ntej nrog tus nqi tsis kam, qhov ntsuas rov qab nrog tus nqi tsis kawg, thiab qhov txiaj ntsig ntawm qhov ntsuas ntsuas ntsuas ntsuas ntsuas qhov ntsuas yog tib yam. Yog tias pom qhov ntsuas rov qab nrog tus nqi tiv thaiv, nws qhia tau tias lub diode tuaj yeem muaj qhov xau ntawm qhov rov qab. Hauv qhov no, peb yuav tsum siv cov cuab yeej tshwj xeeb los kuaj xyuas, thiab siv lub tshuab multimeter los ntsuas seb puas muaj cov dej xau hauv lub diode no tsis raug.
