Vim li cas lub multimeter tsis tuaj yeem kuaj pom 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.
Txoj kev daws teeb meem ntawm digital multimeter
1. Kev tsom xam Waveform
Siv lub tshuab hluav taws xob oscilloscope los soj ntsuam qhov voltage waveform, amplitude, lub sij hawm (frequency), thiab lwm yam ntawm txhua qhov tseem ceeb ntawm lub voj voog, xws li ntsuas seb lub moos oscillator pib oscillate thiab seb qhov oscillation zaus yog 40kHz.
Yog hais tias lub oscillator tsis muaj cov zis, nws txhais tau hais tias lub internal inverter ntawm TSC7106 puas, los yog lub sab nraud Cheebtsam yog qhib. Saib xyuas tias lub waveform ntawm tus pin {21} ntawm TSC7106 yuav tsum yog 50Hz square nthwv dej, txwv tsis pub sab hauv 200 zaus sib faib yuav puas.
2. Kev ntsuas qhov ntsuas qhov ntsuas
Kev ntsuas hauv online lossis off-line ntawm cov khoom nyob rau hauv qhov kev ua txhaum ntau yuav tsum tau tshuaj xyuas qhov ntsuas qhov ntsuas. Thaum ntsuas kev tiv thaiv hauv online, nws yog ib qho tsim nyog yuav tsum xav txog qhov cuam tshuam ntawm cov khoom sib txuas nrog nws.
3. Kev daws teeb meem zais
Nkaum faults hais txog qhov txhaum uas tshwm sim thiab ploj mus ib ntus, thiab ntsuas qhov zoo thiab qhov tsis zoo. Hom kev ua tsis tiav no yog qhov nyuaj dua, thiab qhov ua rau tsis ua haujlwm muaj xws li cov pob qij txha tsis muaj zog, xoob, xoob txuas, kev sib cuag tsis zoo ntawm kev hloov pauv, kev ua haujlwm tsis ruaj khov, thiab kev tawg ntawm cov hlau txuas txuas ntxiv.
Tsis tas li ntawd, nws kuj suav nrog kev ua tsis tiav los ntawm qee yam sab nraud, xws li kub ambient kub, av noo siab, lossis cuam tshuam muaj zog cuam tshuam cov teeb liab nyob ze.
4. Kev tshuaj xyuas qhov muag
Kov lub roj teeb, resistors, transistors, thiab cov blocks sib xyaw nrog koj txhais tes kom pom tias qhov kub thiab txias siab dhau lawm. Yog tias lub roj teeb uas tau teeb tsa tshiab ua kom sov, nws txhais tau hais tias muaj qhov luv luv hauv Circuit Court. Tsis tas li ntawd, nws tseem yuav tsum tau saib xyuas seb lub Circuit Court puas raug kaw, desoldered, mechanically puas, thiab lwm yam.
5. Tshawb xyuas qhov ua haujlwm voltage ntawm txhua qib
Tshawb xyuas qhov ua haujlwm voltage ntawm txhua qhov taw tes thiab sib piv nrog tus nqi ib txwm muaj. Ua ntej, xyuas qhov tseeb ntawm qhov siv voltage. Nws yog qhov zoo tshaj plaws los siv digital multimeter ntawm tib tus qauv lossis zoo sib xws los ntsuas thiab sib piv.
