Siv ib tug multimeter los ntsuas rau pem hauv ntej tsis kam ntawm diode, vim li cas txhua iav?
Cov multimeter hloov pauv qhov ntsuas ntsuas tus nqi mus rau hauv cov teeb liab digital los ntawm A / D hloov dua siab tshiab nti, thiab tom qab ntawd qhia tus nqi tsis kam. Pointer multimeter qhia tus lej tus nqi los ntawm deflection ntawm lub taub hau sib nqus. Yog tias peb pom tias tsis muaj tus nqi tiv thaiv nyob rau hauv ob qho tib si rau pem hauv ntej thiab rov qab cov lus qhia thaum siv digital multimeter los ntsuas qhov diode tsis kam, muaj cov laj thawj hauv qab no:
Diode ntsuas hauv Circuit Board
Ua ntej ntawm tag nrho cov, qhov tso zis voltage ntawm pointer multimeter yog txawv los ntawm cov digital multimeter. Feem ntau, qhov siab tshaj plaws tso zis voltage ntawm pointer multimeter yog 9 volts, thaum lub digital multimeter yog 3 volts. Tib lub sijhawm, tsis tsuas yog lawv cov zis voltages sib txawv, tab sis peb xaiv cov iav sib txawv thaum ntsuas, thiab lawv cov zis voltages kuj txawv. Cov zis hluav taws xob ntawm cov ntaub ntawv multimeter kuj muaj nyob ntawm 1.0 volts txog 3.0 volts. Qhov tsis kam tso zis voltage ntawm pointer multimeter feem ntau siab dua li ntawm digital multimeter. Cov zis voltage ntawm pointer multimeter yog ntau dua li qhov voltage nco tus nqi ntawm diode, thiab diode tuaj yeem qhib. Txawm li cas los xij, digital multimeter yog qee zaum tsawg dua qhov voltage poob tus nqi ntawm diode, uas yuav ua rau tsis muaj kawg rau pem hauv ntej thiab thim rov qab thaum ntsuas diode.
Qhov thib ob, lub diode qhov voltage poob cov yam ntxwv txawv, uas yuav ua rau qhov sib txawv ntawm diode ntsuas los ntawm pointer multimeter thiab diode ntsuas los ntawm digital multimeter. Piv txwv li, qhov hluav taws xob poob ntawm silicon raj thiab germanium raj feem ntau yog nyob nruab nrab ntawm {{0}}.3 V thiab 0.6 V, tab sis qee qhov tshwj xeeb diodes, xws li high-voltage diodes, muaj ib tug kuj loj on-off voltage poob, uas feem ntau yog siab tshaj 0.7 V. Txawm li cas los, peb cov multimeter muaj ib tug tsis tshua muaj zog cov ntaub ntawv voltage thiab tsis tuaj yeem tig rau lub diode, yog li qhov kev tiv thaiv yuav tshwm sim thaum ntsuas.
Thaum peb siv digital multimeter los ntsuas qhov zoo ntawm diode, nws yog qhov zoo tshaj los xaiv lub diode iav. Lub diode iav ntawm digital multimeter feem ntau yog kwv yees li 2.6 volts, uas feem ntau yog ntau dua li qhov kev poob qis ntawm diode, thiab lub diode tuaj yeem tig rau pem hauv ntej.
Yog tias peb xav siv cov ntaub ntawv tiv thaiv los ntsuas seb puas muaj cov xau hauv lub diode, peb tuaj yeem xaiv cov ntaub ntawv tiv thaiv ntawm digital multimeter. Lub sijhawm no, qhov tshwm sim yuav tsum yog tias muaj kev tawm tsam nyob rau hauv pem hauv ntej thiab infinite kuj nyob rau hauv lub rov qab kev taw qhia. Cov txiaj ntsig ntsuas los ntawm pointer multimeter yog tib yam. Yog tias muaj kev tiv thaiv nyob rau hauv qhov kev taw qhia rov qab, nws ua pov thawj tias tej zaum yuav muaj cov dej xau hauv qhov rov qab ntawm lub diode. Hauv qhov no, peb yuav tsum siv lub cuab yeej tshwj xeeb los kuaj xyuas nws. Nws tsis yog qhov tseeb uas siv multimeter los ntsuas seb puas muaj cov dej xau hauv lub diode.
