Siv ib tug multimeter los ntsuas lub pem hauv ntej kuj ntawm lub diode, yog vim li cas txhua iav
Cov multimeter digital hloov cov ntsuas ntsuas tus nqi los ntawm A / D hloov dua siab tshiab nti los hloov cov teeb liab analog rau hauv cov teeb liab digital thiab tom qab ntawd qhia tus nqi tsis kam. Tus pointer multimeter qhia tus nqi los ntawm kev deflection ntawm lub taub hau sib nqus. Tsis muaj tus nqi tiv thaiv nyob rau pem hauv ntej thiab rov qab cov lus qhia ntawm lub diode nyob rau hauv cov ntaub ntawv tiv thaiv, tab sis muaj kuj nyob rau hauv pem hauv ntej kev taw qhia ntawm lub diode kuaj nrog ib tug pointer multimeter, feem ntau yog vim li cas hauv qab no:
Diode ntsuas hauv Circuit Boards
Ua ntej tshaj plaws, qhov tso zis hluav taws xob ntawm cov iav tiv thaiv ntawm tus pointer multimeter yog txawv ntawm cov digital multimeter. Feem ntau, qhov siab tshaj plaws tso zis voltage ntawm tus pointer multimeter yog 9 volts, thaum lub siab tshaj plaws tso zis voltage ntawm lub multimeter yog feem ntau 3 volts. Tsis tsuas yog lawv cov zis voltages txawv, Peb xaiv cov iav sib txawv thaum ntsuas, thiab cov zis voltages kuj txawv. Cov zis hluav taws xob ntawm cov khoom siv hluav taws xob tsis zoo ntawm cov digital multimeter yog li ntawm 1.0 volts txog 3.0 volts. Cov zis hluav taws xob ntawm cov iav tiv thaiv ntawm tus pointer multimeter feem ntau siab dua li ntawm cov multimeter digital. Cov zis hluav taws xob ntau dua li qhov ntsuas hluav taws xob poob qis ntawm diode, thiab lub diode tuaj yeem tig rau, tab sis cov multimeter digital yog qee zaum me dua qhov voltage poob tus nqi ntawm diode, yog li lub diode tsis tuaj yeem qhib, uas yuav ua rau tsis muaj qhov kawg. pem hauv ntej thiab thim rov qab tsis kam thaum ntsuas lub diode.
Qhov thib ob, cov yam ntxwv ntawm qhov poob qis ntawm lub diodes yog qhov sib txawv, uas tseem yuav ua rau muaj kev sib txawv ntawm cov txiaj ntsig ntawm kev ntsuas lub diodes thaum peb xaiv qhov tsis kam ntawm tus pointer multimeter thiab cov txiaj ntsig ntawm kev ntsuas cov diodes nrog digital multimeter. Piv txwv li, qhov dav dav voltage poob nqi ntawm silicon raj thiab germanium raj yog {{0}}.3 volts rau 0.6 volts, tab sis qee qhov tshwj xeeb diodes, xws li high-voltage diodes, muaj ib tug kuj loj conduction voltage poob ntawm ntau tshaj 0.7 volts, thiab peb cov multimeter muaj ib tug tsawg kuj voltage, uas tsis tuaj yeem coj lub diode mus rau Pass, yog li tus nqi kuj yuav tshwm sim infinite thaum ntsuas.
Thaum peb siv lub tshuab hluav taws xob digital los ntsuas qhov zoo ntawm lub diode, nws yog qhov zoo tshaj los xaiv lub diode iav. Lub diode iav ntawm digital multimeter feem ntau yog nyob ib ncig ntawm 2.6 volts, uas yog feem ntau ntau dua li tus nqi hluav taws xob rau pem hauv ntej ntawm lub diode, thiab lub diode tuaj yeem tig mus 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. Nyob rau lub sijhawm no, qhov tshwm sim yuav tsum yog tias muaj qhov tsis kam nyob rau hauv kev ntsuas rau pem hauv ntej, thiab qhov kev tawm tsam yog infinite nyob rau hauv qhov kev ntsuas rov qab. Qhov tshwm sim ntawm tus pointer multimeter kuj zoo ib yam. Yog tias qhov ntsuas pom pom tias muaj qhov tsis kam nyob rau hauv qhov kev taw qhia rov qab, uas ua pov thawj tias lub diode tuaj yeem xau hauv qhov rov qab. Hauv qhov no, peb yuav tsum siv lub cuab yeej tshwj xeeb los kuaj xyuas nws. Nws tsis yog qhov tseeb uas siv lub tshuab multimeter los ntsuas seb lub diode puas muaj dej.
