Txoj kev ua kom pom kev zoo rau lub teeb didendment zoo tib yam
Siv tus taw tes puv nrog ib tug 1 {{{}}} ω ntau tuaj yeem txiav txim siab qhov zoo ntawm lub teeb-emitting diode. Nyob rau hauv ib txwm muaj xwm txheej, rau pem hauv ntej tsis kam ntawm ib tug diode ranges los ntawm kaum mus rau 2 {}}}} ω, thaum rov qab tiv thaiv muaj tus nqi ntawm α. Yog tias tus nqi rau pem hauv ntej yog 0 lossis ∞, thiab rov qab tiv nqi yog tsawg heev lossis 0, nws yog ib qho kev puas tsuaj. Txoj kev kuaj pom no tsis tuaj yeem tawm ntawm lub teeb pom kev ntawm lub teeb pom kev zoo, raws li 10k ω ntau tsis tuaj yeem muab qhov tam sim ntawd rau cov LED.
Siv ob lub multimeters los ntsuas ua ke
Yog tias muaj ob lub pointer multimeters (* ntawm tib tus qauv), nws tuaj yeem txheeb xyuas lub teeb pom kev zoo ntawm LED. Txuas cov "+" lub davhlau ya nyob twg ntawm ib tus multimeter rau "-" davhlau ya nyob twg ntawm lwm yam multimeter siv ib xaim. Qhov seem "-" pens txuas nrog tus ncej zoo (p cheeb tsam) ntawm kev sim LED, thiab seem "+" pens txuas nrog tus ncej tsis zoo (n cheeb tsam) ntawm kev sim LED. Ob qho tib si multimeters tau teem rau X 10 ω ntau. Nyob rau hauv ib txwm muaj xwm txheej, nws tuaj yeem taws tau ib txwm tom qab tau txuas nrog. Yog tias lub ci ci yog tsawg heev los yog txawm tias tsis emit teeb, ob lub multimeters tuaj yeem tsim rau * 1 ω. Yog tias nws tseem tsaus ntuj nti lossis txawm tias tsis emit teeb, nws qhia tias kev ua tau zoo ntawm LED yog puas. Nws yuav tsum raug sau tseg tias ob tug neeg yuav tsum tsis txhob muab tso rau ntawm x 1 ω thaum pib ntawm kev ntsuas kom tsis txhob muaj lub teeb pom kev zoo.
Kev ntsuas ntawm cov hluav taws xob sab nrauv
Cov yam ntxwv photicelectric thiab hluav taws xob ntawm lub teeb-emitting diodes tuaj yeem ntsuas siv 3v voltage regulator lossis ob teev sib txuas cov roj teeb thiab tus lej sib xyaw lossis digital). Rau qhov no, ib qho Circuit Court tuaj yeem txuas tau. Yog tias ntsuas VF yog nruab nrab ntawm 1.4 thiab 3V thiab lub luminous ci yog ib txwm muaj, nws tuaj yeem qhia tau tias cov luminescence yog li qub. Yog tias vf =0 lossis vf ≈ 3v yog ntsuas thiab tsis muaj lub teeb tawm, nws qhia tau tias lub raj tawm lub teeb tawg.
