1, kahlolo ea bolengMOSFETe ntle kapa e mpe
Molao-motheo oa phetoho ea MOSFET le kahlolo e ntle kapa e mpe, qala ka ho sebelisa block ea multimeter R × 10kΩ (e hahiloeng ka 9V kapa 15V betri), pene e mpe (e ntšo) e hokahaneng le heke (G), pene e ntle (e khubelu) e hokahantsoeng le mohloli (S). Ha o tjhaja pakeng tsa heke le mohloli, pointer ea multimeter e tla kheloha hanyane. Hape ho sebelisa multimeter R × 1Ω thibela, pene e mpe ho ea ho drain (D), pene e ntle ho mohloli (S), multimeter e bontša boleng ba li-ohms tse seng kae, e bontšang hore MOSFET e ntle.
2, tlhahlobo ea boleng ba li-electrode tsa junction MOSFET
Multimeter e tla letsetsoa ho faele ea R × 100, pene e khubelu ho tube leha e le efe ea maoto, pene e ntšo ho ea ho e 'ngoe, e le hore leoto la boraro le emisoe. Haeba u fumana ho sisinyeha ho fokolang ha nale ea mithara, paka hore leoto la boraro ke heke. Haeba u batla ho fumana liphello tse hlakileng haholoanyane, u ka boela ua sebelisa 'mele o haufi kapa ka monoana ho ama leoto le emisitsoeng, ha feela u bona nale e khelohile haholo, ke hore, ho bontša hore leoto le emisitsoeng bakeng sa heke, ho sala maoto a mabeli bakeng sa mohloli le drain, ka ho latellana.
Mabaka a khethollo:JFETho hanyetsa ho kenya letsoho ho feta 100MΩ, 'me transconductance e phahame haholo, ha heke e bulehile, sebaka sa motlakase sa motlakase se ka susumetsoa habonolo ke pontšo ea motlakase ea heke, e le hore tube e atisa ho khaola, kapa e atisa ho khanna. Haeba 'mele oa motho ka ho toba ho heke induction gagamalo, ka lebaka la ho kena-kenana le pontšo ea ho kena-kenana le matla, ketsahalo e ka holimo e tla ba e hlakileng haholoanyane. Ka mohlala, nale e ka lehlakoreng le letšehali e kholo haholo, ho bolela hore tube e atisa ho khaoloa, ho fokotseha ha mohloli oa RDS ho eketseha, drain-source current e fokotsa IDS. ho fapana le hoo, nale e ka lehlakoreng le letona la kheloha e kholo, hore tube e atisa ho tsamaisa, RDS ↓, IDS ↑. Leha ho le joalo, hore na nale ea mitha e kheloha ka tsela efe e lokela ho khethoa ke polarity ea motlakase o kentsoeng (ho ea pele kapa ho khutlela morao) le sebaka sa ts'ebetso sa tube.
Mehato ya tlhokomelo:
Liphetho tsa liteko li bontša hore ha matsoho ka bobeli a sirelelitsoe ho tloha lipalong tsa D le S 'me ho angoa heke feela, nale ea metara hangata e kheloha ka ho le letšehali. Leha ho le joalo, ha matsoho ka bobeli a ama lipalo tsa D le S ka ho latellana ’me menoana e ama heke, nale ea methareng e ka bonoa hore e khelohe ka ho le letona. Lebaka la sena ke hore likarolo tse 'maloa tsa' mele oa motho le khanyetso e leemeMOSFETsebakeng sa saturation.
Boikemisetso ba phini ea Crystal triode
Triode e entsoe ka core (li-junctions tse peli tsa PN), li-electrode tse tharo le khetla ea tube, li-electrode tse tharo li bitsoa "mokelli" c, emitter e, base b. Hajoale, triode e tloaelehileng ke silicon planar tube, e arotsoeng hape ka mekhahlelo e 'meli: PNP-mofuta le NPN-mofuta. Li-tubes tsa alloy tsa Jeremane li se li fumaneha seoelo.
Mona re tla hlahisa mokhoa o bonolo oa ho sebelisa multimeter ho lekanya maoto a triode a triode.
1, fumana palo ea motheo, fumana mofuta oa tube (NPN kapa PNP)
Bakeng sa triode ea mofuta oa PNP, lipalo tsa C le E ke lipalo tse ntle tsa lihlopha tse peli tsa PN tse ka hare ho eona, 'me palo ea B ke palo ea eona e tloaelehileng e mpe, ha triode ea mofuta oa NPN e fapane, lipalo tsa C le E ke lipalo tse mpe. ea lihlopha tse peli tsa PN, 'me palo ea B ke palo ea eona e tloaelehileng e ntle,' me ho bonolo ho tseba palo ea motheo le mofuta oa tube ho latela litšobotsi tsa khanyetso e ntle ea PN junction e nyenyane, 'me khanyetso e ka morao e kholo. . Mokhoa o khethehileng ke:
Sebelisa multimeter e letetseng ho R × 100 kapa R × 1K gear. Red pene ama Pin, 'me joale sebelisa pene e ntšo ba ne ba amana le lithakhisa tse ling tse peli, e le hore u ka fumana lihlopha tse tharo (sehlopha se seng le se seng sa tse peli) ho bala, ha e' ngoe ea lihlopha tse peli tsa ho bala li ka tlaase ho hanyetsa boleng ba. li-ohm tse makholo a seng makae, haeba lipini tsa sechaba ke pene e khubelu, ho kopana ke motheo, mofuta oa transistor oa mofuta oa PNP; haeba lithakhisa tsa sechaba ke pene e ntšo, ho kopana ke motheo, mofuta oa transistor oa mofuta oa NPN.
2, tsebahatsa emitter le mokelli
E le tlhahiso ea triode, libaka tse peli tsa P kapa tse peli tsa N ka har'a mahloriso a doping li fapane, haeba amplifier e nepahetseng, triode e na le amplifier e matla, 'me ka tsela e fapaneng, ka amplifier e fosahetseng, amplifier amplifier ea palo e kholo e fokolang haholo. , kahoo triode e nang le amplifier e nepahetseng, triode e nang le amplifier e fosahetseng, ho tla ba le phapang e kholo.
Ka mor'a ho khetholla mofuta oa tube le setsi sa b, moqokeleli le emitter ba ka khetholloa ka tsela e latelang. Letsetsa multimeter ka ho tobetsa R x 1K. Hlakola motheo le pinana e 'ngoe hammoho ka matsoho a mabeli (e-ba hlokolosi hore u se ke ua lumella li-electrode hore li kopane ka ho toba). E le ho etsa hore ketsahalo ea ho lekanya e be e hlakileng, kolobisa menoana ea hau, penya pene e khubelu ka setsi, u phunye pene e ntšo ka pinana e 'ngoe,' me u ele hloko boholo ba ho swing ho nepahetseng ha pontšo ea multimeter. Ka mor'a moo, fetola lithapo tse peli, pheta mehato e ka holimo ea tekanyo. Bapisa boholo ba nale ka litekanyo tse peli 'me u fumane karolo e nang le ho sisinyeha ho hoholo. Bakeng sa li-transistors tsa mofuta oa PNP, kopanya pene e ntšo ho pini le pinch ea motheo hammoho, pheta liteko tse ka holimo ho fumana hore na amplitude ea nale e kholoanyane ke efe, bakeng sa mofuta oa NPN, pene e ntšo e hokahane le setsi, e khubelu. pene e hokahane le emitter. Ka mofuta oa PNP, pene e khubelu e kopantsoe le mokelli, pene e ntšo e kopantsoe le emitter.
Molao-motheo oa mokhoa ona oa ho khetholla ke ho sebelisa betri ho multimeter, motlakase o eketsoa ho mokelli le emitter ea transistor, e le hore e be le bokhoni ba ho holisa. Hand pinch botlaaseng lona, mokelli, lekana le ho hanyetsa ka letsoho ho triode hammoho le leeme positive, hona joale, e le hore e tsamaisa, ka nako ena boholo ba mitha nale ho sokela ho le letona bonahatsa matla a lona amplification, e le hore u ka ka nepo. fumana sebaka sa emitter, mokelli.
Nako ea poso: Apr-21-2024
