Multimeter los txiav txim qhov polarity ntawm diode ohms cov ntaub ntawv
Feem ntau, lub diode xim ntawm qhov kawg yog qhov zoo, xws li 2AP1 ~ 2AP7, 2AP11 ~ 2AP17, thiab lwm yam .. Yog tias lub diode yog pob tshab iav rooj plaub diode, lub polarity tuaj yeem pom ncaj qha, uas yog, qhov kawg txuas nrog sab hauv. mus rau cov xov hlau yog qhov zoo, thiab qhov kawg txuas nrog daim ntawv semiconductor yog qhov tsis zoo. Yas-coated diodes nrog lub voj voog cim yog qhov tsis zoo, xws li IN4000 series.
Tsis muaj cim ntawm lub diode, multimeter resistor los txheeb xyuas qhov zoo thiab tsis zoo ncej, multimeter resistor thaiv schematic daim duab hauv daim duab T304.
Raws li cov yam ntxwv ntawm lub diode rau pem hauv ntej tsis kam yog me me, rov qab tsis kam yog loj, lub multimeter yuav raug hu mus rau qhov kev tiv thaiv thaiv (feem ntau siv R × 100 los yog R × 1k block. Tsis txhob siv R × 1 lossis R × 10k block, vim R × 1 thaiv siv tam sim no ntau dhau, yooj yim rau hlawv lub raj, thiab R × 10k thaiv siv hluav taws xob ntau dhau, tuaj yeem tawg los ntawm lub raj). Nrog lub meter cwj mem txuas nrog txhua tus ncej ntawm lub diode, ntsuas ob qhov tseem ceeb tsis kam. Ntawm qhov ntsuas me me, qhov kawg txuas nrog tus cwj mem dub yog qhov zoo ntawm lub diode. Ib yam li ntawd, nyob rau hauv qhov ntsuas loj dua tus nqi ntawm ib lub sij hawm, thiab tus cwj mem dub txuas mus rau qhov kawg ntawm lub diode qhov tsis zoo davhlau ya nyob twg. Yog tias qhov ntsuas qhov zoo thiab rov qab ua haujlwm tsawg heev, qhia tias lub raj yog luv luv; Yog hais tias qhov zoo thiab rov qab tsis kam yog loj heev, ces lub raj yog qhib-circuited. Hauv ob qho tib si, lub raj siv tsis tau. (Hauv lub multimeter, tus cwj mem dub txuas nrog lub davhlau ya nyob twg zoo ntawm lub roj teeb sab hauv.)
Rau lub teeb-emitting diodes, feem ntau, lub electrode yog me me, luv dua ib tug zoo ncej ntawm lub teeb-emitting diode, lub electrode yog ib tug loj ib tug yog nws cov ncej tsis zoo. Yog hais tias koj yuav ib tug tshiab taw ntev ib tug yog tus zoo ncej.
