Yog vim li cas vim li cas LED teeb hlaws tsis teeb thaum ntsuas los ntawm multimeter
LED, tseem hu ua lub teeb-emitting diode, yog ib hom diode, yog li cov yam ntxwv ntawm diodes kuj muaj cov yam ntxwv zoo ib yam li lub teeb-emitting diodes.
Diode yam ntxwv
Lub diode muaj cov yam ntxwv ntawm kev coj mus rau pem hauv ntej thiab thim rov qab txiav tawm, uas yog, nws tsuas yog tso cai tam sim no los ntawm ib kawg ntawm diode mus rau lwm qhov kawg; yog tias qhov kev taw qhia yog qhov sib txawv, qhov tam sim no yuav raug thaiv thiab tsis tuaj yeem hla. Txhawm rau kom lub diode ua tiav kev coj mus rau pem hauv ntej thiab rov qab txiav tawm, ib qho xwm txheej yuav tsum tau ntsib - qhov hluav taws xob siv rau pem hauv ntej yog ntau dua qhov hluav taws xob conduction.
Qhov no txhais li cas? piv txwv:
Raws li pom hauv daim duab saum toj no, xav tias qhov hluav taws xob tom ntej ntawm lub diode yog 2V. Thaum qhov hluav taws xob ntawm lub davhlau ya nyob twg a yog 2V siab tshaj qhov hluav taws xob ntawm lub davhlau ya nyob twg b, lub diode tau qhib, thiab tam sim no ntws los ntawm lub davhlau ya nyob twg a mus rau lub davhlau ya nyob twg b; Yog tias qhov hluav taws xob tsawg dua 2V, qhov tam sim no tsis tuaj yeem dhau.
Koj nkag siab li cas?
Peb tuaj yeem suav tias lub diode yog lub qhov rooj hlau, uas tuaj yeem raug thawb los ntawm sab nraud mus rau sab hauv, thiab rov qab, nws tsis tuaj yeem raug thawb los ntawm sab hauv mus rau sab nraud. Qhov no zoo li lub unidirectional conduction yam ntxwv ntawm lub diode.
Ib yam li ntawd, vim hais tias lub qhov rooj hlau yog hnyav heev, txawm hais tias nws tuaj yeem raug thawb qhib los ntawm sab nraud mus rau sab hauv, nws yuav tsum muaj qee qhov quab yuam kom ua li ntawd. Qhov no zoo ib yam li tig-on voltage ntawm lub diode.
Multimeter ntsuas lub teeb-emitting diodes
Muaj cov ntaub ntawv diode nyob rau hauv multimeter, uas feem ntau yog ua ke nrog cov ntaub ntawv buzzer. Qhov tsis muaj qhov hluav taws xob ntawm lub diode iav ntawm digital multimeter (uas yog, qhov hluav taws xob ntawm ob qhov kev sim ua thaum lub multimeter tsis txuas nrog lub resistor) tsawg heev, feem ntau txog 3V, thiab cov multimeters sib txawv yuav muaj qhov sib txawv me ntsis.
Lub tig-on voltage ntawm cov xim sib txawv thiab cov qauv ntawm LEDs txawv. Feem ntau, qhov hluav taws xob poob ntawm cov xim liab, daj thiab txiv kab ntxwv yog li 1.8-2.2V; qhov voltage poob ntawm dawb, ntsuab, xiav thiab liab LEDs yog 2.7- Txog 3.3V; tsev neeg LED teeb hlaws yog feem ntau txog 3V.
Cov ntsiab lus
Vim hais tias qhov hluav taws xob conduction ntawm lub teeb-emitting diodes sib txawv, qhov ntsuas qhov ntsuas no loj heev, yog li nws yog qhov qub uas LED teeb hlaws tsis teeb thaum ntsuas los ntawm multimeter. Txawm hais tias tib lub multimeter ntsuas LED teeb hlaws ntawm cov xim sib txawv, lawv qhov ci kuj txawv. Feem ntau, liab yog qhov ci tshaj plaws, xiav yog qhov tsaus ntuj tshaj plaws, thiab ntshav tsis tuaj yeem txawm ci.
Nws tuaj yeem pom los ntawm qhov no tias LED teeb hlaws tsis teeb thaum lub multimeter ntsuas nws. Qhov laj thawj yog vim li cas qhov zoo thiab qhov tsis zoo ntawm tus cwj mem xeem thiab lub diode tau thim rov qab.
Rau lub pointer multimeter, cov hlau lead kuaj dub txuas nrog rau tus ncej zoo ntawm lub diode, thiab cov hlau kuaj liab txuas nrog rau qhov tsis zoo ntawm lub diode; rau cov digital multimeter, cov hlau kuaj liab txuas nrog rau tus ncej zoo ntawm lub diode, thiab cov hlau kuaj dub txuas nrog rau qhov tsis zoo ntawm lub diode.
Yog hais tias lub multimeter tsis teeb thaum qhov kev xeem coj mus txuas nrog kom raug, lub ntsiab yog vim li cas cov zis voltage ntawm multimeter tsis txaus thiab conduction voltage ntawm lub diode yog siab. Nws raug nquahu kom hloov mus rau × 100 lossis × 1K rau kev ntsuas.
