Kev soj ntsuam yuam kev ntawm Multimeter uas ntsuas tib qhov hluav taws xob nrog ntau qhov sib txawv
Qhov tseeb theem ntawm multimeter feem ntau muab faib ua ob peb theem xws li {{0}}.1, 0.5, 1.5, 2.5, thiab 5. Kev ntsuas qhov tseeb (precision) qib rau DC voltage, tam sim no, AC voltage, tam sim no, thiab lwm yam iav yog qhia raws li qhov feem pua ntawm qhov siab tshaj plaws qhov kev tso cai yuam kev △ X rau qhov kev xaiv tag nrho cov nqi ntawm qhov ntau. Qhia tawm hauv cov qauv: A%=(△ X/tus nqi tag nrho) × 100%
Qhov yuam kev tshwm sim los ntawm kev ntsuas tib qhov hluav taws xob nrog ntau qhov sib txawv ntawm multimeter
Piv txwv li, MF-30 multimeter muaj qhov tseeb ntawm 2.5. Thaum ntsuas tus qauv voltage ntawm 23V siv 100V lossis 25V lub zog, lub iav twg muaj qhov yuam kev tsawg tshaj plaws?
Qhov siab tshaj plaws qhov yuam kev rau 100V iav yog X (100)=± 2.5% × 100V=± 2.5V.
Qhov siab tshaj plaws qhov yuam kev rau 25V iav yog △ X (25)=± 2.5% × 25V=± 0.625V.
Raws li tau pom los ntawm cov saum toj no, thaum ntsuas 23V tus qauv voltage nrog 100V iav, kev nyeem ntawv ntawm multimeter yog nruab nrab ntawm 20.5V thiab 25.5V. Ntsuas 23V tus qauv voltage nrog 25V iav, thiab kev nyeem ntawv ntawm multimeter yog nyob nruab nrab ntawm 22.375V{10}}.625V. Los ntawm cov txiaj ntsig saum toj no, nws tuaj yeem pom tias △ X (100) ntau dua △ X (25), qhia tias qhov ntsuas qhov yuam kev ntawm 100V iav yog qhov loj dua li ntawm 25V iav. Yog li ntawd, thaum ntsuas qhov sib txawv voltages nrog ib tug multimeter, qhov yuam kev tsim los ntawm kev ntsuas nrog ntau yam sib txawv tsis zoo ib yam. Thaum ua tau raws li qhov tseem ceeb ntawm cov teeb liab ntsuas, nws raug nquahu kom xaiv cov iav nrog cov kab me me kom ntau li ntau tau. Qhov no tuaj yeem txhim kho qhov tseeb ntawm qhov ntsuas.
Lub multimeter tsis tsuas yog siv los ntsuas qhov tsis kam ntawm cov khoom ntsuas, tab sis kuj ntsuas AC thiab DC voltages. Txawm hais tias qee qhov multimeters tuaj yeem ntsuas qhov tseem ceeb ntawm cov transistors thiab cov capacitance ntawm capacitor. Ua tiav kev siv lub tshuab multimeter yog ib qho kev txawj ntse tshaj plaws hauv tshuab hluav taws xob. Multimeters muaj xws li pointer multimeters thiab digital multimeters. Lub pointer hom multimeter yog ib qho kev ntsuas ntau yam nrog lub ntsuas lub taub hau raws li cov ntsiab lus tseem ceeb, thiab cov ntsuas ntsuas tau nyeem los ntawm tus taw tes ntawm lub ntsuas lub taub hau. Qhov ntsuas qhov tseem ceeb ntawm digital multimeter yog ncaj qha tso tawm hauv daim ntawv digital ntawm lub vijtsam LCD, ua rau nws yooj yim nyeem. Qee tus txawm muaj lub suab hais. Multimeter yog ib qho cuab yeej uas siv lub taub hau 'meter' thiab sib xyaw ua ke voltmeter, ammeter, thiab ohmmeter.
