Lub multimeter twg yog qhov zoo rau cov kws tshaj lij hluav taws xob?
Pointer multimeter ntsuas qhov yuam kev, hloov pauv tus nqi qeeb, tab sis qhov ntsuas ntawm lub capacitor them thiab tso tawm cov zaub intuitive, AC voltage thaiv siv ib nrab-yoj rectification (diode rectification) yog li tus pointer multimeter AC voltage thaiv kev ntsuas qhov yuam kev yog loj vim AC voltage thaiv. siv ib nrab-yoj rectification, yog li ntawd tus pointer multimeter AC voltage thaiv kev ntsuas yog qhov nruab nrab tus nqi ntawm qhov hloov tam sim no, vim hais tias qhov ntsuas AC teeb liab yog tom qab lub divider resistor divider tom qab ib nrab-yoj rectification tawm yog DC tam sim no, xav txog qhov nruab nrab tus nqi ntawm alternating tam sim no, pointer multimeter input impedance tsis siab npaum li digital multimeter input impedance, rhiab heev tsis siab npaum li digital multimeter rhiab heev. Rectified tawm ntawm DC tam sim no, xav txog qhov nruab nrab tus nqi ntawm AC fais fab, pointer multimeter input impedance tsis siab npaum li qhov input impedance ntawm cov multimeter, rhiab heev tsis siab npaum li qhov rhiab heev ntawm cov multimeter, tab sis tus kws tshaj lij hluav taws xob los yog pom zoo. MF-47 pointer multimeter, tus tshiab MF-47 Circuit Court tsim, cov kev tiv thaiv thaiv thiab tam sim no thaiv tau retrofitted nrog varistors los ua cov overvoltage tiv thaiv ntsiab, qee yam MF-47, MF{ {7}} Nws tsis haum rau ntsuas AC lub zog rau lub sijhawm ntev, thiab nws yooj yim rau hlawv qhov hluav taws xob faib hluav taws xob ntawm qhov qis tshaj AC voltage thaiv thiab lub rectifier diode hauv lub rectifier, uas ua rau qhov kev ntsuas loj ntawm AC voltage thaiv lossis tsis ua hauj lwm ntawm tag nrho cov AC voltage blocks. (Kub qhov hluav taws xob faib hluav taws xob ntawm qhov qis tshaj AC voltage thaiv, piv txwv li, 38.3K resistor txuas nrog AC 10V thaiv, yuav ua rau qhov tsis ua haujlwm ntawm tag nrho AC voltage blocks, thiab feem ntau hlawv AC voltage thaiv hauv lub rectifier ntawm ob lub rectifier. diodes nyob rau hauv ib qho ntawm AC voltage thaiv yuav tshwm sim nyob rau hauv AC voltage thaiv kev ntsuas yuam kev los yog AC voltage thaiv tsis ua hauj lwm) los yog hais tias, lub iav hloov kev sib cuag yog tsis zoo, los yog lub iav hloov luv luv Circuit Court tshwm sim los ntawm qhov hluav taws kub ntawm lub voltage. divider resistor lossis burning rectifier diode tshwm sim los ntawm qhov tsis ua hauj lwm ntawm AC voltage thaiv, vim tam sim no lub iav hloov yog hloov PCB.
Multimeter txij nkawm ntawm qee qhov kev paub, koj tuaj yeem ntsuas lub zog AC, tab sis nws tsis haum rau lub sijhawm ntev. Feem ntau los txiav txim siab seb qhov 220V lossis 380V voltage yog qhov qub, tab sis yog tias nquag lossis ncua ntev ntawm kev hloov tam sim no, ces MF-47 AC voltage thaiv voltage divider resistor nrog rau rectifier diode yuav muaj kev cuam tshuam, kuv tau sau rau hauv saum toj no MF-47 pointer multimeter AC voltage thaiv qhov txhaum yog qhov ua rau.
