Vim li cas thiaj ua lub teeb LED tsis taws thaum ntsuas siv kev siv ntau?
LED hlaws dai, tseem hu ua lub teeb-emitting diodes, koom nrog ib hom diode. Thaum ntsuas cov hlaws teeb nrog cov digital motimeter, cov Diode ntau zaus siv. Qhov kev sojntsuam liab tau txuas nrog tus ncej zoo ntawm LED hlaws, thiab cov kev sojntsuam dub tau txuas nrog tus ncej tsis zoo ntawm LED hlaws. Qhov ci ntsa iab (ci ci me ntsis) ntawm LED BEAD yog pom nrog lub qhov muag liab qab los txiav txim. Qee zaum, vim li cas cov nqaij coj zoo tsis taws thaum ntsuas nrog ntau qhov sib txawv? Muaj ntau yam yog vim li cas.
1. Tsis muaj-load voltage ntawm Diod ntau ntawm cov digital potimeter feem ntau yog ib puag ncig 2.8v {4}}. 2V.
Rov qab hais tias peb feem ntau siv compital anitionats bee hom kom nrhiav cov yuam kev, xws li ntsuas cov hlau hlau. Thaum ob qhov kev sim cov ntsiab lus tau txuas ncaj qha, lub pultimimeter yuav tshuaj lom neeg. Hom kev ntsuas lub suab kev ntsuas cov nqi tiv thaiv ntawm ob lub ntsiab lus, thiab kev haus dej caw yuav yog qhov ua tau yog tsawg dua li 70 ω. Ntau cov neeg muaj ntau zog muaj lawv cov diode thiab cov qauv ua ke nrov sib xyaw ua ke hauv ib txoj haujlwm, uas tuaj yeem hloov nrog lub pob. Qhov tseeb, ntsuas kev ntsuas yog zoo sib xws, nrog ib qho tshwj xeeb voltage muaj nuj nqis thiab lwm yam ua rau lub siab.
Lub hauv paus ntsiab lus ntawm cov qauv ntawm ib tug mullamimeter yog tias nws muaj qhov hloov pauv tam sim no ntawm qhov chaw tam sim no yog hais txog 2.8V. Tus qauv hluav taws xob sib txawv ntawm cov qauv sib txawv ntawm cov neeg coob me me ntsis, feem ntau ntawm 2.6V ~ 3V. Cov zis tam sim no ntawm qhov chaw tam sim no yog hais txog 1ma,
Thaum ntsuas cov diode tas li, cov kev sojntsuam liab tau txuas nrog qhov zoo ntawm Diode thiab cov kev sojntsuam dub txuas nrog lub davhlau ya nyob twg. The multimeter displays the voltage drop of the diode, which is generally around {{0}}.7V for silicon diodes and 0.3V for germanium diodes.
2. Rau pem hauv ntej Voltage poob ntawm LED BEADS yog txog 1.8V ~ 3.5v
LED hlaws ntawm cov xim sib txawv thiab cov qauv muaj ntau lub conduction conduction dauv. Feem ntau, lub teeb-emitting dodes siv raws li lub zog ntsuas teeb liab yog xim liab, ntsuab hauv cov xim, nrog lub conduction voltage poob ntawm li 1.8v ~ 2.2V.
Lub conduction voltage poob ntawm dawb thiab xiav coj beads yog hais txog 2.7v ~ 3.3v. Lub tsev neeg teeb pom kev zoo muaj teeb liab teeb yog feem ntau dawb LED beads, nrog ua haujlwm voltage ntawm txog 3V, 2.8v, 3.5v, thiab lwm yam.
Kev tsom xam dav: to taub txoj ntsiab cai ntawm multimeter diode ntawm hom kev ntsuas LED thiab cov haujlwm siab tshaj plaws ntawm kev sib tw ntawm 2.8v {2}}. 2V. Thaum ntsuas cov ntsuas hluav taws xob ntsuas ntawm cov noob LED yog nyob hauv qhov hluav taws xob no, ua haujlwm tam sim no ntawm 1MA yuav ua rau lub teeb pom me ntsis. Txawm li cas los xij, thaum ntsuas kev ntsuas ntsuas hluav taws xob ntawm cov noob LED yog siab, vim tias qhov tsis txaus ntseeg ntawm hom kev sib tw ntau yam, lub teeb LED yuav tsis teeb me ntsis. Tias yog vim li cas txawm hais tias cov hlaws LED yog qhov qub, lawv tsis taws thaum ntsuas nrog tus multimeter.
