1, kuweruza kwabwinoMOSFETzabwino kapena zoipa
Mfundo yosinthira MOSFET ndi chiweruzo chabwino kapena choipa, choyamba gwiritsani ntchito chipika cha multimeter R × 10kΩ (chomangidwa mu 9V kapena 15V batire), cholembera (chakuda) cholumikizidwa ndi chipata (G), cholembera chabwino (chofiira) cholumikizidwa ndi gwero (S). Mukalipira pakati pa chipata ndi gwero, cholozera cha multimeter chidzasinthidwa pang'ono. Kachiwiri pogwiritsa ntchito multimeter R × 1Ω chipika, cholembera zoipa kukhetsa (D), cholembera zabwino kwa gwero (S), multimeter limasonyeza mtengo wa ohms ochepa, kusonyeza kuti MOSFET zabwino.
2, kusanthula kwabwino kwa ma elekitirodi a MOSFET
Multimeter idzayimbidwa ku fayilo ya R × 100, cholembera chofiira ku chubu chilichonse cha phazi, cholembera chakuda kupita ku china, kuti phazi lachitatu liyimitsidwe. Ngati mutapeza kugwedezeka pang'ono kwa singano ya mita, tsimikizirani kuti phazi lachitatu ndilo chipata. Ngati mukufuna kupeza zotsatira zoonekeratu, mungagwiritsenso ntchito thupi pafupi kapena ndi chala kuti mugwire phazi loyimitsidwa, malinga ngati mukuwona kuti singano ikupotozedwa kwambiri, ndiko kuti, kusonyeza kuti phazi loyimitsidwa pachipata, otsala mapazi awiri kwa gwero ndi kukhetsa, motero.
Zifukwa za tsankho:JFETathandizira kukana ndi wamkulu kuposa 100MΩ, ndi transconductance ndi mkulu kwambiri, pamene chipata ndi lotseguka-dera, malo electromagnetic munda mosavuta anachititsa ndi chipata voteji chizindikiro, kuti chubu amakonda kudula, kapena amakonda conduction. Ngati thupi la munthu mwachindunji ku chipata kulowetsedwa voteji, chifukwa athandizira kusokoneza chizindikiro ndi wamphamvu, chodabwitsa pamwamba adzakhala zoonekeratu. Mwachitsanzo, singano yakumanzere ndi yayikulu kwambiri, zikutanthauza kuti chubu chimatha kudulidwa, kukhetsa-gwero kukana RDS kumawonjezeka, kukhetsa-gwero lapano kumachepetsa IDS. m'malo mwake, singano kumanja kwa kupatuka kwakukulu, kuti chubu limakonda conduction, RDS ↓, IDS ↑. Komabe, mbali yomwe singano ya mita imapatuka ikuyenera kutsimikiziridwa ndi polarity ya voteji yomwe imapangitsa (voltage yakutsogolo kapena kumbuyo) ndi malo opangira chubu.
Kusamalitsa:
Zotsatira zoyesa zikuwonetsa kuti manja onse akatsekeredwa kuchokera pamitengo ya D ndi S ndipo chipata chokha chimakhudzidwa, singano ya mita nthawi zambiri imapatukira kumanzere. Komabe, manja onse akakhudza mitengo ya D ndi S motsatana ndi zala zikugwira pachipata, singano ya mita imatha kuwonedwa kuti ikutembenukira kumanja. Chifukwa cha ichi ndi chakuti mbali zingapo za thupi la munthu ndi kukana kukonderaMOSFETm'dera la saturation.
Kutsimikiza kwa pini ya Crystal triode
Triode imapangidwa ndi core (awiri PN junctions), ma electrode atatu ndi chubu chipolopolo, ma elekitirodi atatu amatchedwa wosonkhanitsa c, emitter e, maziko b. Pakalipano, triode wamba ndi silicon planar chubu, yomwe imagawidwa m'magulu awiri: PNP-mtundu ndi NPN-mtundu. Machubu a aloyi a Germany ndi osowa tsopano.
Apa tikuwonetsa njira yosavuta yogwiritsira ntchito multimeter kuyeza mapazi a triode a triode.
1, pezani mzati woyambira, dziwani mtundu wa chubu (NPN kapena PNP)
Pamitundu itatu ya PNP, mitengo ya C ndi E ndi mitengo yabwino yamagulu awiri a PN mkati mwake, ndipo B mzati ndi mzati wake wamba woyipa, pomwe mitundu itatu yamtundu wa NPN ndiyosiyana, mizati ya C ndi E ndiyo mizati yoyipa. mwa magawo awiri a PN, ndipo B pole ndi mtengo wake wamba wabwino, ndipo n'zosavuta kudziwa mzati woyambira ndi mtundu wa chubu molingana ndi makhalidwe a PN junction kukana kwabwino ndi kochepa, ndipo kukana kumbuyo ndi kwakukulu. . Njira yeniyeni ndi:
Gwiritsani ntchito multimeter yomwe imayimbidwa pa R × 100 kapena R × 1K gear. Red cholembera kukhudza pini, ndiyeno ntchito cholembera wakuda anali olumikizidwa kwa zikhomo zina ziwiri, kotero kuti inu mukhoza kutenga magulu atatu (gulu lililonse la awiri) kuwerenga, pamene mmodzi wa magulu awiri a kuwerenga ali mu mtengo otsika kukana wa mazana angapo ohms, ngati zikhomo zapagulu ndi cholembera chofiira, kukhudzana ndi maziko, mtundu wa transistor wa mtundu wa PNP; ngati zikhomo zapagulu ndi cholembera chakuda, kukhudzana ndi maziko, mtundu wa transistor wa mtundu wa NPN.
2, kuzindikira emitter ndi wokhometsa
Monga kupanga triode, awiri P m'dera kapena awiri N dera mkati doping ndende ndi osiyana, ngati amplifier yoyenera, triode ali ndi amplifier amphamvu, ndi mosemphanitsa, ndi amplifier molakwika, ndi amplifier amplifier ambiri ofooka kwambiri. , kotero triode yokhala ndi amplifier yoyenera, triode yokhala ndi amplifier yolakwika, padzakhala kusiyana kwakukulu.
Pambuyo pozindikira mtundu wa chubu ndi maziko a b, wosonkhanitsa ndi emitter amatha kudziwika motere. Imbani multimeter mwa kukanikiza R x 1K. Tsinani maziko ndi pini ina pamodzi ndi manja onse awiri (samalani kuti maelekitirodi agwirizane mwachindunji). Kuti mupangitse kuti muyeso uwonekere, nyowetsani zala zanu, tsinani cholembera chofiira ndi maziko, tsinani cholembera chakuda ndi pini ina, ndipo samalani kukula kwa kugwedezeka koyenera kwa cholozera cha multimeter. Kenako, sinthani zikhomo ziwirizo, bwerezani masitepe omwe ali pamwambapa. Yerekezerani kukula kwa singano kugwedezeka mumiyeso iwiri ndikupeza gawolo ndi kugwedezeka kwakukulu. Pakuti PNP-mtundu transistors, kulumikiza cholembera wakuda ndi pini ndi m'munsi kutsina pamodzi, kubwereza zatsopano pamwamba kupeza pamene singano kugwedezeka matalikidwe ndi lalikulu, kwa NPN-mtundu, cholembera wakuda chikugwirizana ndi maziko, wofiira cholembera chikugwirizana ndi emitter. Mu mtundu wa PNP, cholembera chofiira chimagwirizanitsidwa ndi wosonkhanitsa, cholembera chakuda chikugwirizana ndi emitter.
Mfundo ya njira yozindikiritsa iyi ndikugwiritsa ntchito batri mu multimeter, magetsi amawonjezeredwa kwa osonkhanitsa ndi emitter ya transistor, kuti athe kukulitsa. Dzanja kutsina maziko ake, wokhometsa, wofanana ndi kukana mwa dzanja kwa triode kuphatikiza zabwino kukondera panopa, kotero kuti amachitira, pa nthawi iyi ukulu wa mita singano kugwedezeka kumanja zimasonyeza mphamvu matalikidwe ake, kotero inu mukhoza molondola. kudziwa malo emitter, wokhometsa.
Nthawi yotumiza: Apr-21-2024
