Qhov sib txawv ntawm pointer multimeter thiab digital multimeter
Multimeter yog cov cuab yeej siv feem ntau siv hauv kev kho hluav taws xob kev lag luam. Koj yuav tsum paub txog kev siv multimeter thiab nkag siab txog kev sim ntsuas ntawm multimeter. Cov tshuab hluav taws xob koom nrog hluav taws xob muaj zog thiab tsis muaj zog feem ntau tsuas yog siv AC thiab DC qhov hluav taws xob thiab lub zog ntsuas hluav taws xob, thiab tsis tshua siv lwm lub zog.
Peb paub tias cov kws kho hluav taws xob feem ntau yuav tsum ntsuas qhov ua tau zoo ntawm ntau yam khoom siv hluav taws xob. Lawv yuav tsum tau siv cov kev tiv thaiv, DC voltage, AC voltage, capacitance, diode thiab lwm yam zog ntawm lub multimeter los ntsuas thiab txiav txim siab cov faulty Cheebtsam.
Nws feem ntau pom tau tias cov kws kho hluav taws xob siv cov pointer multimeters. Puas yog txhob txwm tshaj tawm lawv txoj kev saib xyuas kev sib sib zog nqus? Los yog muaj lwm qhov laj thawj? Dab tsi yog qhov txawv ntawm pointer multimeter thiab digital multimeter? Cia kuv qhia koj:
Raws li rau qhov sib txawv ntawm ob meters, nws yog ib qho teeb meem ntawm kev xav. Cov kev xav txawv. Hnub no kuv yuav tham txog kuv lub tswv yim thiab vam tias koj tuaj yeem muab tswv yim rau kuv.
Lub pointer multimeter siv lub magnetoelectric DC ammeter rhiab heev li lub taub hau meter. Thaum lub sij hawm kev xeem, thaum DC tam sim no ntws los ntawm lub coil lub qhov txhab nyob ib ncig ntawm lub hlau nplaum, lub kauj yog raug quab yuam nyob rau hauv lub magnetic teb ntawm cov hlau nplaum mus tas li thiab tsav lub pointer, kom tus pointer nyob twj ywm ntawm ib tug tej txoj hauj lwm, thiab cov kev nyeem ntawv sib raug. yog muab rau ntawm tus xov tooj sib tham. Mechanical zeroing yog siv los kho tus pointer xoom txoj hauj lwm yuam kev, thiab tus pointer raug kho rau xoom thaum tsis muaj teeb liab.
Qhov zoo: Lub pointer multimeter yog ib qho khoom siv passive (uas yog, nws tuaj yeem ua haujlwm yam tsis muaj lub roj teeb nruab rau hauv multimeter), nrog rau siab rhiab heev thiab teb ceev ceev. Los ntawm lub viav vias ntawm tus taw tes, lub cev lub cev ntawm cov khoom nyob rau hauv kev sim tuaj yeem tshwm sim intuitively.
Qhov tsis zoo: Tsis muaj peev xwm tiv thaiv hluav taws xob cuam tshuam tsis zoo, kev nyeem ntawv tsis yooj yim, tsis muaj peev xwm tiv thaiv seismic, ohm zeroing yuav tsum tau ua thaum kuaj tsis kam, thiab tsuas yog voltages saum toj no 0.5V tuaj yeem kuaj. Qhov tseeb ntawm kev ntsuas qhov hluav taws xob tsis muaj zog tsis txaus, thiab nws tsis yooj yim rau nqa.
Digital multimeter yog nruab nrog ib qho kev ua haujlwm ua haujlwm amplifier circuit. Los ntawm kev ua piv txwv cov khoom nyob rau hauv kev sim, cov txiaj ntsig kev ntsuam xyuas tau nkag mus rau hauv A / D converter sab hauv, txee, thiab tom qab ntawd mus rau qhov kev ua haujlwm logic rau kev ua haujlwm, thiab tom qab ntawd tso tawm los ntawm lub qhov rais zaub. Digital multimeters yog cov khoom siv ua haujlwm (lub ntsuas ntsuas tsis tuaj yeem ua haujlwm zoo yam tsis muaj roj teeb nruab). Qhov zoo: qhov raug siab, tshwj xeeb tshaj yog qhov ntsuas hluav taws xob tuaj yeem raug rau 0.001V (qee lub ntsuas ntsuas), nyeem tau yooj yim, muaj zog tiv thaiv hluav taws xob cuam tshuam, yooj yim nqa.
Qhov tsis zoo: cov lus teb qeeb qeeb, tsis tuaj yeem kuaj xyuas qee cov khoom siv semiconductor, tsis tuaj yeem kuaj cov khoom xau, thiab lwm yam.
