Ngingawubona kanjani umehluko phakathi kwamandla kanye nobuthakathaka be-Mosfets?

Kunezindlela ezimbili zokuhlukanisa phakathi kokuhle nokubi kwe-Mosfet.

Esokuqala: ukuhlukanisa ngokufanelekile izinga likagesi le-Mosfet

I-Multimeter izodayela ku-R × 100 gear, ipeni elibomvu elixhunywe ngokungahleliwe ku-tube yonyawo, ipeni elimnyama lixhunywe kwelinye ithubhu lezinyawo, ukuze unyawo lwesithathu lugcine isimo esimisiwe. Uma uthola inaliti has a jitter kancane, kufakazela ukuthi unyawo lwesithathu for esangweni. Uma uthola ukubonwa okusobala kakhudlwana komphumela wangempela, ungase futhi ube seduze nokudlidliza kwe-elekthronikhi noma ukuthinta umunwe okulenga ezinyaweni zomoya, kuphela ukubona ukuchezuka kwenaliti, okungukuthi, okubonisa ukuthi ukulenga ezinyaweni zomoya kuyisango, ezinye izinyawo ezimbili ziwumthombo kanye nokukhipha amanzi, ngokulandelana.

Hlukanisa isizathu: Ukumelana okokufaka kwe-JFET kungaphezu kuka-100MΩ, futhi i-transconductance iphakeme kakhulu, lapho isango liholwa, indawo yasendlini kazibuthe kulula kakhulu ukubona isignali yedatha ye-voltage esebenzayo esangweni, ukuze ipayipi lithambekele kube phezulu, noma kuvame ukuba on-off. Uma i-voltage yokungeniswa komzimba yengezwa ngokushesha esangweni, ngoba ukuphazamiseka okubalulekile kwe-electromagnetic kunamandla, isimo esingenhla sizobaluleka kakhulu. Uma inaliti yemitha ichezuka ngokucijile iye kwesokunxele, kusho ukuthi ipayipi livame ukuba phezulu, i-RDS yokumelana nomthombo wokukhipha amanzi iyakhula, futhi inani lamanje lomthombo wokukhipha amanzi liyehlisa i-IDS. Ngokuphambene, inaliti yemitha ichezukela ngokucijile iye kwesokudla, okubonisa ukuthi ipayipi livamise ukuthi licime, i-RDS iye phansi, bese i-IDS iye phezulu. Kodwa-ke, indawo ngqo lapho inaliti yemitha ichezukiswa khona kufanele incike ezigxotsheni ezinhle nezingezinhle ze-voltage eyengelwe (i-voltage esebenza indawo eqondile noma i-voltage yokusebenza ebuyela emuva) kanye nendawo emaphakathi yokusebenza yepayipi.

Okwesibili: ukuhlukanisa ngokufanelekile izinzuzo kanye nokubi kwe-mosfet

Okokuqala sebenzisa i-multimeter R × 10kΩ block (ibhethri elishumekiwe elingu-9V noma elingu-15V), ipeni elinegethivu (elimnyama) elixhunywe esangweni (G), ipeni eliphozithivu (elibomvu) elixhunywe kumthombo (S). Esangweni, umthombo wokushaja kwebhethri emaphakathi, khona-ke inaliti ye-multimeter inokuphambuka okuncane. Bese ushintshela ku-multimeter R × 1Ω block, ipeni elibi liye ku-drain (D), ipeni elihle emthonjeni (S), inani elimakiwe le-multimeter uma i-ohm embalwa, kubonisa ukuthi i-mosfet yinhle.