Yuav ua li cas xaiv ib tug multimeter ntau thiab tsis txhob ntsuas qhov yuam kev
Yuav muaj qee qhov yuam kev thaum ntsuas nrog lub multimeter. Qee qhov yuam kev no yog qhov yuam kev siab tshaj plaws uas tso cai los ntawm qib raug ntawm qhov ntsuas nws tus kheej. Qee qhov yog tib neeg yuam kev los ntawm kev hloov kho thiab siv tsis raug. Yog tias koj nkag siab zoo txog cov yam ntxwv ntawm multimeters thiab qhov ua rau ntsuas qhov yuam kev, thiab paub txog cov txheej txheem ntsuas thiab cov txheej txheem, koj tuaj yeem txo qhov kev ntsuas yuam kev.
Tib neeg kev nyeem ntawv yuam kev yog ib qho ntawm qhov cuam tshuam rau kev ntsuas qhov tseeb. Nws yog kev zam tsis tau tab sis tuaj yeem txo qis. Yog li ntawd, kev saib xyuas tshwj xeeb yuav tsum tau them rau cov ntsiab lus hauv qab no thaum siv:
1. Ua ntej ntsuas, tso lub multimeter horizontally thiab ua txhua yam xoom hloov;
2. Khaws koj ob lub qhov muag perpendicular rau lub pointer thaum nyeem ntawv;
3. Thaum ntsuas tsis kam, xoom hloov yuav tsum tau ua txhua zaus koj hloov lub zog. Yog tias nws tsis tuaj yeem ncav cuag xoom, hloov lub roj teeb nrog ib qho tshiab;
4. Thaum ntsuas qhov kev tiv thaiv lossis qhov hluav taws xob siab, tsis txhob tuav cov hlau ib feem ntawm cov hlau lead nrog koj ob txhais tes kom tsis txhob shunting ntawm tib neeg lub cev tsis kam, nce kev ntsuas yuam kev lossis ua rau hluav taws xob poob siab;
5. Thaum ntsuas qhov kev tawm tsam hauv RC Circuit Court, txiav tawm lub hwj chim hauv Circuit Court thiab tso tawm tag nrho cov hluav taws xob khaws cia hauv lub capacitor ua ntej ntsuas dua. Tom qab tsis suav nrog tib neeg kev nyeem ntawv yuam kev, peb ua qee qhov kev tshuaj xyuas ntawm lwm qhov yuam kev.
Multimeter voltage thiab tam sim no ntau yam xaiv thiab ntsuas yuam kev
Qhov tseeb ntawm multimeters feem ntau muab faib ua ntau theem xws li {{0}}.1, 0.5, 1.5, 2.5, 5, thiab lwm yam. Rau DC voltage, tam sim no, AC voltage, tam sim no thiab lwm yam iav, calibration ntawm qhov tseeb (precision) theem yog sawv cev los ntawm feem pua ntawm qhov siab tshaj plaws tso cai raug yuam kev △X thiab tag nrho cov nqi ntawm qhov kev xaiv. Qhia los ntawm tus qauv: A%=(△X/tag nrho tus nqi) × 100%……1
2. Kev xaiv ntau yam thiab ntsuas qhov yuam kev ntawm hluav taws xob thaiv
Txhua qhov kev tiv thaiv hluav taws xob tuaj yeem ntsuas qhov ntsuas qhov ntsuas ntawm 0 mus rau ∞. Qhov ntsuas ntawm ohmmeter yog qhov tsis-linear, tsis sib npaug ntawm qhov ntsuas. Nws yog qhia raws li ib feem pua ntawm cov arc ntev ntawm tus pas ntsuas. Tsis tas li ntawd, qhov kev tiv thaiv sab hauv ntawm txhua qhov sib npaug yog sib npaug rau qhov nruab nrab nplai tus lej sib npaug los ntawm qhov ntev ntawm tus pas ntsuas, uas yog hu ua "central resistance". Qhov ntawd yog hais tias, thaum ntsuas qhov kev tiv thaiv yog sib npaug rau qhov nruab nrab tsis kam ntawm qhov kev xaiv, qhov tam sim no ntws hauv Circuit Court yog ib nrab ntawm qhov ntsuas tam sim no. Tus pointer yog nyob rau hauv nruab nrab ntawm lub teev.
