Qhov taw qhia cim rau ntawm pointer multimeter disk yog 0Ω. Vim li cas?
Pointer multimeter's ohm range muaj peb lub ntsiab lus tseem ceeb: 0ω, ∞ thiab tus nqi nruab nrab. Vim hais tias lub ohm iav nws tus kheej yog nruab nrog lub roj teeb, thaum lub luv luv-circuit resistance ntawm lub stylus yog xoom, tam sim no dhau los ntawm lub taub hau meter yog qhov siab tshaj plaws. Lub sijhawm no, tus pointer tau hloov pauv mus rau tag nrho-teev tus nqi nrog xoom-tsim potentiometer, thiab peb txhais tau tias nws yog xoom.
Tom qab lub stylus sib cais, peb suav hais tias qhov kev tawm tsam ntawm ob tus cwj mem yog ∞. Lub sijhawm no, tsis muaj tam sim no dhau los ntawm lub taub hau 'meter', yog li tus taw tes tsis txav, thiab txoj haujlwm no tau cim tias ∞.
Lwm qhov ntsuas tseem ceeb ntawm pointer multimeter's ohm scale yog qhov nruab nrab tsis kam.
Nws tus nqi nruab nrab ntawm ohm cov ntaub ntawv yog 16.5. Muab cov coefficients sib txawv ntawm cov iav sib txawv sawv cev rau tus nqi tsis kam ntawm qhov chaw, piv txwv li, Rx1 sawv rau 16.5Ω, Rⅹ10 sawv rau 165Ω, Rⅹ100 sawv rau 1650Ω, Rx1K sawv rau 16.5 Ω thiab RX16K sawv rau
Tus nqi nruab nrab ntawm qhov ntsuas no tseem ceeb heev, uas yog qhov muaj feem cuam tshuam txog kev ntsuas kev tiv thaiv hauv cov iav no. Piv txwv li, Rx1 yog qhov tsim nyog rau kev ntsuas ntau Ω mus rau ob peb puas Ω tsis kam nyob nruab nrab ntawm 16.5, thiab Rx1K yog qhov tsim nyog rau kev ntsuas ntau k mus rau ntau puas KΩ. Thaum peb ntsuas qhov tsis kam ntawm 100Ω, Rx1 pointer tsuas yog deflects li ntawm 1/6, yog li peb tuaj yeem pom nws meej. Thaum ntsuas nyob rau hauv 10K ntau yam, tus pointer pib taw qhia rau 0Ω txoj hauj lwm. Nws yog ib qho nyuaj rau soj ntsuam qhov hloov maj mam hloov ntawm tus pointer. Nws tuaj yeem pom tau tias thaum ntsuas tib qhov kev tawm tsam, qhov sib txawv ntawm qhov taw qhia ntawm lub zog sib txawv yog txawv.
Nyob rau tib lub sijhawm, qhov nruab nrab teev ntawm ohm iav kuj yog qhov kev tiv thaiv sab hauv ntawm multimeter hauv cov iav no. Cov phooj ywg txaus siab kuj tuaj yeem sim lawv tus kheej. Txoj kev ntsuas tshwj xeeb yog tshem tawm pointer multimeter lub roj teeb, luv luv lub roj teeb clip nrog cov xov hlau, thiab tom qab ntawd nrhiav cov multimeter digital los ntsuas ncaj qha.
