Akwai hanyoyi guda biyu don bambance tsakanin MOSFET mai kyau da mara kyau:
Na farko: qualitatively bambanta abũbuwan amfãni da rashin amfaniMOSFETs
Da farko amfani da multimeter R × 10kΩ block (cuɗe 9V ko 15V baturi mai caji), mummunan alkalami (baƙar fata) da aka haɗa zuwa ƙofar (G), tabbataccen alkalami (ja) wanda aka haɗa zuwa tushen (S). Zuwa bakin kofa, tushen cajin baturi na tsakiya, sannanmultimeter allura tana da juzu'i mai laushi. Sannan canza zuwa multimeter R × 1Ω block,da korau alƙalami zuwa magudana (D), tabbataccen alkalami zuwa tushen (S), ƙimar multimeter da aka lakafta idan 'yan ohm uwa, yana nuna cewa MOSFET yana da kyau.
Na biyu: ƙwaƙƙwaran daidaita matakin wutar lantarki na haɗin MOSFETsZa a buga multimeter zuwa fayil R × 100, jan alkalami ba da gangan ya haɗa shi da bututun ƙafa ba, an haɗa baƙar alƙalami zuwa wani bututun ƙafa, ta yadda ƙafar ta uku ta rataye a cikin iska. Idan ka gano cewa allurar tana da ɗan murƙushewa, an tabbatar da cewa ƙafar ƙafa ta uku don ƙofar. Don samun ƙarin mahimmancin lura da ainihin tasirin, amma kuma girgizar lantarki kusa da ko tare da taɓa yatsa rataye a cikin ƙafafun iska, kawai don ganin allura don babban juyi, wato, yana nuna cewa rataye a ƙafafun iska shine ƙofar. , sauran ƙafa biyu sune tushen da magudanar ruwa.
Dalilai masu ban mamaki:
Juriya na shigarwar JFET ya fi 100MΩ, kuma transconductance yana da girma sosai, lokacin da filin maganadisu na ƙofa na cikin gida yana da sauƙi don jawo siginar bayanan ƙarfin lantarki na aiki akan ƙofar, ta yadda bututun ya kasance har zuwa, ko ya kula. zama on-off. Idan an ƙara ƙarfin shigar da jiki nan da nan zuwa ƙofar, saboda kutsewar maɓalli na lantarki yana da ƙarfi, yanayin da ke sama zai kasance da mahimmanci. Idan allurar mita zuwa hagu na babban jujjuyawar, a madadin bututun yana nufin, faɗaɗawar tushen magudanar ruwa na RDS, adadin magudanar ruwa na yanzu na rage IDS. akasin haka, allurar mita zuwa dama na babban jujjuyawar, yana nuna cewa bututun yana ƙoƙarin kashewa, RDS ↓, IDS ↑. Duk da haka, da mita allura a karshen abin da shugabanci na karkata, ya kamata dogara a kan tabbatacce kuma korau sandunansu na induced ƙarfin lantarki (tabbataccen shugabanci na aiki irin ƙarfin lantarki ko baya shugabanci na aiki ƙarfin lantarki) da kuma aiki batu na karfe bututu.
Faɗakarwa:
(1) Gwajin ya nuna idan aka killace hannaye biyu daga sandunan D da S kuma aka taɓa ƙofar kawai, galibi ana karkatar da allurar zuwa hagu. Koyaya, idan hannaye biyu suna taɓa kowane D, S-pole, kuma tare da yatsunsu suna taɓa ƙofar, yana yiwuwa a lura jujjuyawar allurar zuwa dama. Tushen tushen shine jikin matsayi da yawa da masu tsayayya akan MOSFET yana da tasirin ma'ana, don haka ya shiga cikin yankin jikewa.
Lokacin aikawa: Yuli-22-2024
