Vim li cas kuv thiaj tsis ntsuas qhov polarity ntawm alternating tam sim no nrog ib tug multimeter?
Alternating tam sim no yog ib qho tam sim no uas hloov pauv raws li qhov loj thiab kev coj ua. Nws 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 yog 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 analog lossis digital multimeter, nws tsis tuaj yeem cuam tshuam qhov polarity instantaneous. Nws polarity yog tus naj npawb ntawm lub sij hawm nws hloov ib lub sij hawm. Chav tsev ntawm zaus yog Hertz, uas yog ib chav tsev ntawm physics muaj npe nyob rau hauv lub cim xeeb ntawm physicist Mr. Hertz.
Lub polarity ntawm hom fais fab mov hloov pauv 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 ntawm nws cov polarity tam sim no, nws yuav tsum tau siv tshwj xeeb los saib xyuas qhov hloov pauv tam sim no. Los yog hluav taws xob ntsuas 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 sim cov hlau nyob thiab cov xaim nruab nrab, koj tuaj yeem teeb lub multimeter mus rau qhov siab tshaj plaws AC voltage qhov chaw, tuav cov hlau kuaj dub nrog ib txhais tes, thiab siv cov hlau kuaj liab los kuaj xyuas cov hlau. Lub pointer uas deflects yog cov nyob hlau, thiab lub point uas tsis deflects yog lub nruab nrab hlau. Tsis tas li ntawd, qee qhov digital multimeters tau nruab nrog lub ntsuas ntsuas ntsuas, uas tuaj yeem siv rau qee yam kev ntsuas kev ua haujlwm.
Yuav ua li cas ntsuas lub polarity ntawm electrolytic capacitors nrog ib tug multimeter?
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. Koj tuaj yeem siv multimeter txhawm rau txheeb xyuas qhov zoo thiab qhov tsis zoo ntawm cov polarized capacitor.
Txoj kev kuaj pom: Siv qhov kev teeb tsa tsis kam ntawm lub multimeter los ntsuas qhov kev tiv thaiv rau pem hauv ntej thiab thim rov qab 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) Lub capacitor raug them thaum ntsuas. Muaj cov txheej txheem ntawm kev them nyiaj rau lub capacitor. Tos kom txog thaum cov zaub yog qhov ruaj khov ua ntej nyeem ntawv, qhov tshwm sim yuav raug ntau dua;
(3) Tus cwj mem dub ntawm analog multimeter yog tus ncej zoo thiab tus cwj mem liab yog tus ncej tsis zoo, thaum lub digital multimeter yog qhov sib txawv.
