Vim li cas nws thiaj li thaum kuv siv multimeter los ntsuas qhov zoo ntawm LED hlaws, nws tsis ci?
LED teeb hlaws, tseem hu ua lub teeb-emitting diodes, yog ib hom diode, thaum siv lub tshuab digital multimeter los ntsuas cov LED teeb hlaws, feem ntau siv nws cov diode iav ntsuas, tus cwj mem liab txuas nrog tus ncej zoo ntawm LED teeb. hlaws, tus cwj mem dub txuas nrog tus ncej tsis zoo ntawm LED teeb hlaws, thiab saib xyuas qhov ci ntawm LED teeb hlaws (me ntsis ci) los txiav txim los ntawm qhov muag liab qab. Qee lub sij hawm, vim li cas LED hlaws zoo ntsuas nrog lub multimeter tab sis tsis ci? Muaj ob lub laj thawj tseem ceeb.
1, digital multimeter diode cov ntaub ntawv tsis-load voltage feem ntau yog 2.8V ± 0.2V los yog li ntawd.
Nco qab tias peb feem ntau siv lub multimeter beeping iav los nrhiav qhov tsis raug, xws li ntsuas cov hlau los ntawm, thiab lwm yam, thaum ob lub ntsiab lus ntsuas ncaj qha mus, lub multimeter yuav beep. Lub buzzer iav ntsuas qhov tsis kam ntawm ob lub ntsiab lus, tus nqi tiv thaiv tsawg dua 70Ω lossis yog li thaum lub multimeter yuav beep. Ntau ntau lub diode iav thiab buzzer iav hauv ib lub iav, los ntawm kev hloov pauv tseem ceeb, qhov tseeb, nws txoj hauv kev ntsuas yog qhov zoo sib xws, qhov tseeb ntawm qhov tshwj xeeb voltage tus nqi, lub suab nrov.
Lub hauv paus ntsiab lus ntawm cov ntaub ntawv multimeter diode yog qhov nruab nrab ntawm qhov tam sim no, qhov tam sim no tsis tu ncua ntawm qhov tsis muaj hluav taws xob tso tawm hluav taws xob txog 2.8V, cov qauv sib txawv ntawm multimeter tus nqi hluav taws xob sib txawv me ntsis, feem ntau hauv 2.6V ~ 3V ntawm qhov tam sim no qhov chaw tso zis tam sim no ntawm txog 1mA lossis yog li ntawd, thaum ntsuas cov diodes zoo tib yam, lub ntsuas hluav taws xob liab yog li 1mA.
Thaum ntsuas qhov zoo tib yam diode, tus cwj mem liab txuas nrog lub diode zoo, tus cwj mem dub txuas nrog qhov tsis zoo, lub multimeter qhia tau hais tias tus nqi hluav taws xob ntawm diode voltage poob, silicon cov khoom diode feem ntau yog {{0}}}.7V los yog li ntawd, germanium khoom diode 0.3V los yog li ntawd.
2, LED teeb hlaws rau pem hauv ntej voltage poob 1.8V ~ 3.5V los yog li ntawd
Cov xim sib txawv thiab cov qauv ntawm LED teeb hlaws nrog sib txawv conduction voltage poob, feem ntau yog siv los ua lub zog qhia lub teeb-emitting diodes hauv xim liab, ntsuab thiab daj, nws cov conduction voltage poob ntawm 1.8V ~ 2.2V los yog li ntawd.
Dawb thiab xiav lub teeb hlaws nws qhov kev ntsuas hluav taws xob poob ntawm li 2.7V ~ 3.3V lossis yog li ntawd, lub tsev teeb pom kev zoo LED teeb hlaws yog feem ntau dawb LED teeb hlaws, nws cov kev khiav hauj lwm voltage txog 3V, 2.8V, 3.3V, 3.5V, thiab lwm yam.
Kev tsom xam: nkag siab txog lub hauv paus ntsiab lus ntawm multimeter diode iav thiab kev ua haujlwm voltage ntawm LED teeb hlaws tuaj yeem pom, lub multimeter diode iav qhov siab tshaj plaws ntsuas voltage ntawm 2.8V ± 0.2V lossis li ntawd, qhov ntsuas ntawm LED teeb hlaws ua haujlwm voltage nyob rau hauv tus nqi voltage, 1mA ntawm kev ua haujlwm tam sim no yuav ua rau lub teeb ci LED, tab sis thaum ntsuas LED teeb hlaws ua haujlwm voltage siab dua, piv txwv li, ntau dua 3V, vim qhov tso zis ntawm multimeter diode iav Voltage yog tsis txaus, cov hlaws LED yuav tsis ci me ntsis. Qhov no yog vim li cas cov hlaws LED yog qhov qub, tab sis tsis ci thaum ntsuas nrog multimeter.
