Qhia koj siv lub multimeter los txiav txim qhov zoo thiab qhov tsis zoo ntawm electrolytic capacitors
Hauv kev tsim hluav taws xob circuits, electrolytic capacitors dhau AC thiab DC, thiab tseem siv los khaws thiab tso tawm cov nqi los ua cov lim dej kom du tawm cov teeb liab pulsating. Yuav ua li cas kom paub qhov txawv qhov zoo thiab tsis zoo electrodes ntawm electrolytic capacitors nyob rau hauv Circuit Court tsim? Yog tias nws thim rov qab, nws yog qhov txaus ntshai. Loj-muaj peev xwm capacitors tseem tuaj yeem tawg. Cia peb saib yuav ua li cas siv multimeter los txiav txim qhov zoo thiab qhov tsis zoo ntawm electrolytic capacitors.
1. Taw qhia txog electrolytic capacitors
Electrolytic capacitor yog ib hom capacitor, cov ntawv hlau hlau yog qhov zoo electrode (txhuas lossis tantalum), oxide zaj duab xis (txhuas oxide lossis tantalum pentoxide) ze rau qhov zoo electrode yog dielectric, thiab cathode yog ua los ntawm cov khoom siv hluav taws xob thiab electrolyte. (cov electrolyte tuaj yeem ua kua lossis tantalum pentoxide). Khoom) thiab lwm yam ntaub ntawv ua ke, vim hais tias cov electrolyte yog lub ntsiab ntawm cathode, yog li lub electrolytic capacitor muaj npe. Nyob rau tib lub sijhawm, qhov zoo thiab qhov tsis zoo electrolytic capacitors yuav tsum tsis raug txuas nrog.
Electrolytic capacitor muab faib ua ob hom: tsis-polar thiab polar. Tsis yog-polar electrolytic capacitors siv ob chav oxide zaj duab xis qauv, zoo ib yam li ob tug polar electrolytic capacitors uas txuas ob lub electrodes tsis zoo; polar electrolytic capacitors feem ntau yog siv nyob rau hauv lub hwj chim circuits los yog nyob rau hauv nruab nrab zaus thiab tsawg zaus circuits, nws plays lub luag hauj lwm ntawm lub hwj chim mov filtering, decoupling, teeb liab coupling, lub sij hawm tas li, thiab DC thaiv.
2. Lub luag haujlwm ntawm electrolytic capacitors
Electrolytic capacitor yog dav siv hauv cov khoom siv hauv tsev thiab ntau yam khoom siv hluav taws xob. Polarized electrolytic capacitors feem ntau ua lub luag haujlwm ntawm cov khoom siv hluav taws xob lim dej, decoupling, teeb liab sib txuas, lub sijhawm teeb tsa tas li, thiab DC thaiv hauv cov khoom siv hluav taws xob lossis cov zaus nruab nrab thiab qis zaus. Tsis yog-polar electrolytic capacitors feem ntau yog siv nyob rau hauv cov lus sib faib circuits, TV S kho circuits thiab ib-theem lub cev muaj zog pib circuits. Lub luag haujlwm ntawm electrolytic capacitor feem ntau muab faib ua pawg hauv qab no:
1) Thaiv DC - txoj haujlwm yog los tiv thaiv DC hla dhau thiab tso cai rau AC hla.
2) Filtering----Nyob rau hauv lub hwj huam mov Circuit Court, lub rectifier Circuit Court hloov AC mus rau hauv ib tug pulsating DC, thiab tom qab lub rectifier Circuit Court, ib tug loj-muaj peev xwm electrolytic capacitor txuas nrog, thiab nws cov nqi thiab cov yam ntxwv tawm (lub zog cia ) yog siv los ua tus rectifier. Lub pulsating DC voltage ces dhau los ua qhov ruaj khov DC voltage.
3) Coupling ---- Nyob rau hauv tus txheej txheem ntawm low-frequency teeb liab kis tau tus mob thiab amplification, capacitive coupling feem ntau yog siv los tiv thaiv lub zoo li qub kev khiav hauj lwm cov ntsiab lus ntawm pem hauv ntej thiab nram qab circuits los ntawm kev cuam tshuam ib leeg. Raws li kev sib txuas ntawm ob lub voj voog, nws tso cai rau lub teeb liab AC hla dhau thiab xa mus rau theem tom ntej Circuit Court.
4) Bypass - Muab txoj kev qis-impedance rau qee cov khoom sib txuas hauv AC Circuit Court.
5) Lub zog cia ---- khaws hluav taws xob tso tawm thaum tsim nyog.
6) Kub them nyiaj----Piv rau qhov cuam tshuam ntawm kev hloov pauv tsis txaus ntawm lwm cov khoom rau qhov kub thiab txias los txhim kho qhov ruaj khov ntawm lub voj voog.
7) Tuning - System tuning ntawm zaus-kawg circuits, xws li xov tooj ntawm tes, xov tooj cua, thiab TVs.
3. Siv lub multimeter los txiav txim qhov zoo thiab qhov tsis zoo ntawm cov electrolytic capacitor
Electrolytic capacitor muab faib ua tus ncej zoo thiab tsis zoo. Feem ntau, cov hlau lead ntev yog cov ncej zoo, thiab cov hlau lead luv yog cov ncej tsis zoo, thiab tau cim nrog "ib".
Thaum kuaj qhov zoo ntawm electrolytic capacitor, tig lub multimeter mus rau RXlk, cov hlau kuaj liab txuas nrog qhov tsis zoo electrode ntawm lub electrolytic capacitor, thiab cov hlau kuaj dub txuas nrog nws cov electrode zoo. Nws deflects rau sab laug dua, uas yog, nws poob rov qab rau hauv kev coj ntawm infinity thiab stabilizes. Nyob rau lub sijhawm no, tus nqi qhia los ntawm rab koob yog qhov xau tawm tom ntej ntawm lub capacitor. Qhov loj dua rau pem hauv ntej to taub tsis kam ntawm ib qho electrolytic capacitor, qhov me me ntawm cov xau tam sim no. Feem ntau, qhov xau tawm tom ntej ntawm lub capacitor yog kwv yees li kaum ntawm kiloohms lossis ntau tshaj li ob peb puas kiloohms, raws li qhia hauv daim duab 2-19. Yog hais tias lub capacitance ntawm lub capacitor ntau dua 10uF, txhawm rau tiv thaiv cov koob los ntawm kev khoov, cov coj ntawm ob qho kawg ntawm lub capacitor yuav tsum tau luv luv ua ntej ntsuas kom tso cov nqi them ntawm lub capacitor.
Qhov zoo ntawm electrolytic capacitor nyob ntawm tsis yog tsuas yog nyob ntawm qhov loj ntawm nws qhov kev tiv thaiv rau pem hauv ntej, tab sis kuj nyob ntawm lub viav vias amplitude ntawm rab koob thaum kuaj pom. Qhov ntau tus pointer swings mus rau sab xis, lub peev xwm ntawm electrolytic capacitor ntau dua. Yog tias tus nqi xau tawm yog ntau pua txhiab ohms, tab sis tus pointer tsis viav vias, nws txhais tau hais tias cov electrolyte ntawm capacitor tau qhuav thiab ua tsis tiav thiab siv tsis tau. Yog tias rab koob tsis rov qab mus rau "0" thaum lub sijhawm kuaj, nws txhais tau tias lub capacitor tau tawg lossis luv luv.
