Lub hauv paus ntsiab lus ntawm multimeter ntsuas kuj
Lub hauv paus ntsiab lus ntawm kev ntsuas qhov tsis kam nrog lub multimeter yog ua tau raws li Ohm txoj cai. Hauv multimeter, nws qhov voltage yog qhov voltage ntawm lub roj teeb; nws muaj ob peb qhov tseem ceeb tsis kam, nrog rau qhov kev tawm tsam peb xav sim, nws cov kev hloov kho tau (qhov kev tiv thaiv sab hauv ntawm multimeter sib txawv rau cov zog sib txawv), thiab nws qhov ruaj khov. Thiab qhov tam sim no suav nrog thaum peb qhov kev sim ntsuas yog sib npaug rau xoom. Ua li no, peb tuaj yeem tau txais cov qauv: |=U/(Rg plus Rset plus Radjustment plus Rmeasurement), U yog qhov voltage ntawm nws cov roj teeb sab hauv, Rg yog qhov tsis kam ntawm lub taub hau meter, R yog tsau, thiab lub 'meter' txuas nrog hauv series A ruaj tus nqi resistor, Radjustment, qhov sib txawv resistor rau xoom hloov kho, Rmeasurement, qhov tsis kam yuav ntsuas. Nyob ntawm seb qhov kev tiv thaiv ntau npaum li cas los ntsuas, qhov ruaj khov-tus nqi kuj siv los kuj sib txawv, uas ua rau cov multimeter muab faib ua ntau theem.
Thaum ntsuas nrog ib tug multimeter, qhov kev nyeem ntawv kuj yog qhov kev nyeem ntawv tam sim no, tsuas yog kos qhov tam sim no thaum R=0: |=U / (Rg plus Rset plus Rtune) li R=0, thiab thaum tsis muaj tam sim no, qhov kev tiv thaiv yog cim ntawm tsis muaj kev tawm tsam, kuv thiab yog kev sib raug zoo, lawv tsis yog ib qho yooj yim proportional kev sib raug zoo. Cov ntaub ntawv sib txawv raug xaiv, thiab R tau teeb tsa txawv. Thaum R=0, nws txawv, yog li nws yuav tsum tau xoom ua ntej txhua qhov ntsuas.
