Multimeter los ntsuas qhov ua rau LED teeb hlaws tsis teeb
LED, tseem hu ua lub teeb-emitting diode yog ib hom diode, yog li lub diode muaj tib yam ntxwv ntawm lub teeb-emitting diodes.
Cov yam ntxwv ntawm Diode
Diode muaj rau pem hauv ntej conduction rov qab mus rau cov yam ntxwv, uas yog, nws tsuas tso cai rau tam sim no los ntawm ib kawg ntawm diode ntws mus rau lwm yam kawg; yog hais tias qhov kev taw qhia ntawm qhov opposite, ces tam sim no yuav thaiv tsis tau. Rau lub diode kom 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.
Peb tuaj yeem xav txog lub diode li lub qhov rooj hlau, lub qhov rooj hlau tsuas yog tso cai rau thawb qhib los ntawm sab nraud mus rau sab hauv, thiab tig los ntawm sab hauv mus rau sab nraud tsis tuaj yeem thawb. Qhov no yog analogous rau unidirectional conduction yam ntxwv ntawm lub diode.
Ib yam li ntawd, vim lub rooj vag hlau no hnyav, txawm tias nws tuaj yeem raug thawb qhib los ntawm sab nraud hauv, tab sis nws yuav tsum tau siv qee lub zog los ua. Qhov no yog ib qho piv txwv rau qhov conduction voltage ntawm lub diode.
Ntsuas lub teeb-emitting diodes nrog ib tug multimeter
Lub multimeter muaj ib hom diode, uas feem ntau yog ua ke nrog lub beep hom. Qhov tsis muaj hluav taws xob tsis muaj hluav taws xob (piv txwv li, qhov hluav taws xob ntawm ob lub cwj mem thaum lub tshuab hluav taws xob tsis txuas nrog lub ntsuas hluav taws xob) ntawm cov ntaub ntawv diode ntawm digital multimeter yog tsawg heev, feem ntau txog 3V, uas yuav txawv me ntsis ntawm ib qho multimeter mus rau lwm qhov.
Cov xim sib txawv thiab cov qauv ntawm lub teeb-emitting diodes muaj qhov sib txawv conduction voltages, feem ntau qhov voltage poob ntawm liab, daj thiab txiv kab ntxwv lub teeb-emitting diodes yog hais txog 1.8-2.2V; dawb, ntsuab, xiav thiab liab lub teeb-emitting diodes muaj ib tug voltage poob li ntawm 2.7-3.3V; thiab LED lub teeb hlaws rau kev siv hauv tsev yog feem ntau txog 3V.
Cov ntsiab lus
Vim tias qhov sib txawv ntawm lub teeb-emitting diode conduction voltage tsis zoo ib yam, qhov ntsuas qhov ntsuas no loj heev, yog li lub multimeter los ntsuas lub teeb ci LED hlaws tsis teeb qhov no yog qhov qub heev. Txawm hais tias tib lub multimeter los ntsuas cov xim sib txawv ntawm LED teeb hlaws, lawv qhov ci ntsa iab tsis zoo ib yam, feem ntau qhov ci ntsa iab tshaj plaws, xiav tsaus, ntshav tsis tuaj yeem txawm teeb.
Nws tuaj yeem pom tias qhov ntsuas multimeter LED teeb hlaws hlaws tsis teeb, tej zaum yuav ua rau tus cwj mem thiab lub diode zoo thiab tsis zoo ncej yog thim rov qab.
Rau lub pointer multimeter, tus cwj mem dub txuas nrog lub diode zoo, tus cwj mem liab txuas nrog lub diode tsis zoo; rau digital multimeter, tus cwj mem liab txuas nrog lub diode zoo, tus cwj mem dub txuas nrog lub diode tsis zoo.
Yog hais tias lub multimeter txuas nrog rau cov ntaub ntawv raug, lub multimeter LED teeb hlaws tsis teeb, qhov laj thawj tseem ceeb yog vim li cas lub multimeter tso zis voltage tsis txaus, lub diode conduction voltage siab, nws raug nquahu kom hloov mus rau × 100 iav los yog × 1K iav ntsuas.
