Hom multimeter zoo li cas rau kev ntsuas qhov zoo ntawm LED teeb hlaws?
Lub 10k resistor range siv lub roj teeb uas muaj qhov voltage ntawm 9-15V. Thaum ib tug loj resistor txuas nrog nyob rau hauv series, xyuas kom meej tias tus pointer rov qab mus rau xoom los ntsuas qhov tsis kam saum 10k.
Vim tias cov hlaws LED tsuas yog teeb tsa nrog ob peb milliamps ntawm tam sim no, thaum ntsuas qhov tsis kam, qhov me me tam sim no tsim ib lub voj voog rau lub teeb ci LED, uas ua haujlwm thiab tawm lub teeb.
Los ntawm txoj kev, kuv xav qhia me me ntau lawm: vim hais tias lub roj teeb nruab nrog no multimeter tsis ruaj khov, kuv pom ob lub xov tooj ntawm tes roj teeb txuas nrog hauv koob ntawm 8V. Ua li no, qhov voltage tsis txaus thiab tus pointer tsis tuaj yeem rov qab mus rau xoom. Yog li, kuv hloov lub resistor thiab xaiv ib hom zoo resistor los ntawm ntau tus resistors. Tom qab hloov nws, nws tseem ua haujlwm zoo. Tom qab siv nws rau ib xyoos, kuv pom tias tus pointer tsis tuaj yeem rov qab mus rau xoom ntawm 10k iav, qhia tias lub roj teeb yuav tsum tau them, uas yooj yim heev thiab yooj yim.
Ib qho digital multimeter feem ntau tuaj yeem ntsuas qhov zoo ntawm LED lub teeb hlaws sai sai. Yav dhau los, kuv tau xa ib txoj kev siv lub multimeter los ntsuas qhov zoo ntawm LED lub teeb hlaws. Lub diode hom ntawm multimeter tuaj yeem siv tau. Niaj hnub no, yuav luag txhua hom digital multimeter muaj hom no, yog li txawm tias hom multimeter siv, nws tuaj yeem ntsuas tau sai heev (tsuas yog rau digital, pointer type).
Txoj kev sib txuas series
Txoj kev tshawb nrhiav no kuj yooj yim heev. Ua ntej, qhib lub teeb ntawm LED teeb kom kuaj thiab nthuav tawm cov hlaws LED. Feem ntau, cov hlaws LED sab hauv txuas nrog hauv cov koob, yog li siv lub diode iav tuaj yeem muab lub zog rau cov hlaws LED no. Yog tias qhov polarity tsis thim rov qab, cov hlaws ib txwm LED yuav teeb, thiab cov hlaws puas LED yuav tsis pom tseeb. Vim lub diode iav peb xaiv, qhov sib txawv ntawm cov ntsiab lus ntawm LED hlaws tsis zoo thiab cov hlaws zoo LED kuj tuaj yeem pom meej meej ntawm qhov screen.
Parallel txuas txoj kev
Rau qhov xwm txheej uas muaj ntau lub chips LED txuas nrog rau tib lub sijhawm, nws muaj peev xwm hais tias hom diode tsis tuaj yeem tsav ntau LED chips. Yog li ntawd, koj tuaj yeem sim siv 5V fais fab mov nrog 330 Ω resistor nyob rau hauv nruab nrab, thiab txuas cov electrodes mus rau ob hnub ntawm LED chips. Yog tias koj pom ntau lub chips LED teeb thiab qee cov chips LED tsis teeb, nws tuaj yeem txiav txim siab tias cov nti tsis yog tawg.
Vim qhov tseeb tias feem ntau pointer multimeters siv ob lub 1.5V roj teeb ua lub zog rau R × 1-R × 1K resistor range, thiab 9V laminated roj teeb yog siv nyob rau hauv R × 10K ntau yam, ntsuas qhov zoo ntawm LED hlaws tsis tuaj yeem ua rau lawv tawm lub teeb ib txwm.
Txhawm rau ua kom cov chips LED tawm lub teeb thaum ntsuas, yuav tsum xaiv lub multimeter nrog lub zog ntawm 4.5V lossis siab dua.
Kuv tau tshawb nrhiav ntau lub multimeters uas kuv tau siv ua ntej rau kev sim sib piv, thiab thaum kawg, tsuas yog ib qho multimeter muaj peev xwm. Nws yog ib qho me me portable multimeter powered los ntawm 12V micro roj teeb, nrog rau qhov me me thiab kev ua haujlwm dav. Kev ntsuas qhov zoo ntawm LEDs yog qhov yooj yim heev thiab yooj yim.
Teem lub iav mus rau "on / off" ntsuas hom, uas kuj yog hom diode ntsuas. Txuas lub xov tooj liab mus rau qhov "+" davhlau ya nyob twg ntawm LED thiab qhov kev sojntsuam dub mus rau lub davhlau ya nyob twg "-" kom nws teeb. Nws tseem tuaj yeem siv rau kev ntsuas hauv online yam tsis muaj kev cuam tshuam. Luminous yog zoo, tsis luminous yog phem, intuitive heev.
