Dab tsi yog vim li cas vim li cas lub multimeter tsis tuaj yeem ntsuas qhov polarity ntawm alternating tam sim no
Alternating tam sim no yog ib qho tam sim no uas hloov pauv raws li qhov loj thiab kev coj ua. Tsis muaj polarity, tsuas yog zaus. Qhov zaus ntawm kev hloov tam sim no hauv kuv lub teb chaws yog 50 Hz, uas yog, qhov hloov pauv tam sim no rov qab 50 zaug hauv ib ob, thiab cov kev taw qhia hloov 100 zaug. Qhov teeb meem no nws tus kheej muaj teeb meem.
Lub npe hu ua alternating tam sim no txhais tau hais tias lub polarity hloov pauv, thiab kev hloov pauv ceev heev. Txawm hais tias nws yog hom pointer lossis digital multimeter, nws tsis tuaj yeem cuam tshuam qhov polarity instantaneous. Nws polarity yog tus naj npawb ntawm lub sij hawm nws hloov nyob rau hauv ib chav tsev lub sij hawm. Chav tsev ntawm zaus yog Hertz, uas yog lub cev lub cev muaj npe hauv kev nco txog tus kws kho mob Mr. Hertz.
Lub polarity ntawm cov khoom siv fais fab no hloov pauv, thiab nws tsis tuaj yeem ntsuas nws cov polarity nrog lub tshuab multimeter. Yog tias nws yog qhov tsim nyog kom paub qhov polarity ntawm ib lub sijhawm, uas yog, txoj kev yooj yim tshaj plaws rau nws cov polarity tam sim no, nws yuav tsum tau siv tshwj xeeb los saib xyuas qhov hloov pauv tam sim no. Los yog ib qho khoom siv hluav taws xob oscilloscope rau cov pulses ncaj qha tam sim no.
Kev taw qhia ntawm kev hloov pauv tam sim no hloov txhua lub sijhawm, tsis hais polarity. Yog tias koj xav ntsuas cov hlau nyob thiab cov xaim nruab nrab, koj tuaj yeem tig lub multimeter mus rau qhov siab tshaj plaws AC voltage, pinch cov hlau lead dub nrog ib txhais tes, thiab siv cov xim liab coj los kuaj xyuas cov hlau. Tsis tas li ntawd, qee qhov digital multimeters muaj lub luag haujlwm ntawm electroscope cwj mem, uas tuaj yeem siv rau qee qhov kev ntsuas kev ua haujlwm.
Yuav ua li cas siv multimeter los ntsuas qhov polarity ntawm electrolytic capacitors?
Thaum lub polarized capacitor txuas nrog rau pem hauv ntej, qhov xau me me, thiab thaum nws txuas nrog rau qhov rov qab, qhov xau loj. Ib tug multimeter tuaj yeem siv los txheeb xyuas qhov zoo thiab qhov tsis zoo ntawm cov polarized capacitor.
Txoj kev kuaj pom: Siv lub multimeter los ntsuas qhov zoo thiab qhov tsis zoo ntawm lub capacitor. Qhov kev tiv thaiv loj dua yog rau pem hauv ntej, thiab qhov kev tawm tsam me dua yog thim rov qab.
Cov kev ceev faj:
(1) Ua ntej ntsuas, siv lub resistor lossis xaim kom tso cov hluav taws xob ntxiv ntawm lub capacitor;
(2) Thaum ntsuas, lub capacitor raug them, thiab kev them nyiaj ntawm lub capacitor muaj cov txheej txheem. Tos kom txog thaum cov zaub yog qhov ruaj khov ua ntej nyeem ntawv, thiab qhov tshwm sim yuav raug ntau dua;
(3) Tus cwj mem dub ntawm tus pointer multimeter yog tus ncej zoo, thiab tus cwj mem liab yog tus ncej tsis zoo, thaum lub digital multimeter yog qhov sib txawv.
