Kev sim txoj kev rau ib tug multimeter ntawm zoo tib yam lub teeb-emitting diodes:
Ntsuas qhov R × 10K ntau yam nrog Fluke digital multimeter
Tus pointer hom multimeter nrog 10k Ω iav tuaj yeem txiav txim siab qhov zoo ntawm lub teeb-emitting diode. Nyob rau hauv ib txwm muaj, tus nqi pem hauv ntej tsis kam ntawm lub diode yog li ntawm kaum rau 200k Ω, thiab tus nqi rov qab yog ∝. Yog tias tus nqi tiv thaiv pem hauv ntej yog 0 lossis ∞, thiab tus nqi rov qab los yog tsawg heev los yog 0, nws yuav ua rau puas tsuaj. Txoj kev kuaj pom no tsis tuaj yeem soj ntsuam lub luminescence ntawm lub teeb-emitting raj, vim tias 10k Ω iav tsis tuaj yeem muab qhov loj rau pem hauv ntej tam sim no rau LED.
Siv ob lub multimeter los ntsuas ua ke
Yog tias muaj ob lub pointer multimeters (* zoo ntawm tib tus qauv), nws tuaj yeem txheeb xyuas qhov teeb meem ntawm lub teeb-emitting diode zoo dua. Txuas lub "+" davhlau ya nyob twg ntawm ib lub multimeter mus rau lub "-" davhlau ya nyob twg ntawm lwm lub 'meter' nrog ib tug hlau. Qhov seem "-" cwjmem txuas nrog rau tus ncej zoo (P cheeb tsam) ntawm qhov ntsuas LED, thiab cov cwj mem "+" ntxiv yog txuas nrog tus ncej tsis zoo (N cheeb tsam) ntawm qhov ntsuas LED. Ob lub multimeters yog teem rau 10 Ω iav. Raws li ib txwm muaj, nws tuaj yeem teeb pom kev zoo li qub tom qab txuas nrog. Yog tias qhov ci ntsa iab qis heev thiab txawm tias tsis tawm lub teeb, ob qho tib si multimeters tuaj yeem teeb tsa rau × 1 Ω. Yog tias nws tseem tsaus heev thiab txawm tsis tawm lub teeb, nws qhia tau tias qhov kev ua tau zoo ntawm LED yog * * lossis puas. Nws yuav tsum tau muab sau tseg tias ob lub multimeters yuav tsum tsis txhob muab tso rau ntawm × 1 Ω thaum pib ntawm kev ntsuas kom tsis txhob muaj ntau dhau tam sim no thiab kev puas tsuaj rau lub teeb-emitting diode.
Kev ntsuas cov khoom siv hluav taws xob sab nraud
Cov yam ntxwv kho qhov muag thiab hluav taws xob ntawm lub teeb-emitting diodes tuaj yeem ntsuas tau yog siv lub 3V voltage regulator lossis ob series txuas nrog roj teeb qhuav thiab multimeter (pointer lossis digital). Txhawm rau ua tiav qhov no, tsuas yog txuas lub voj voog raws li qhia hauv daim duab 10. Yog tias qhov ntsuas VF nyob nruab nrab ntawm 1.4-3V thiab cov luminescence ci ntsa iab yog qhov qub, nws tuaj yeem qhia tau tias lub luminescence yog qhov qub. Yog tias VF=0 lossis VF ≈ 3V ntsuas thiab tsis tawm lub teeb, nws qhia tau tias lub teeb emitting raj puas lawm.
