Kuv yuav ua li cas yog tias lub teeb liab voltage ntawm cov multimeter tsis muaj zog thaum siv?
Kev ntsuas qhov hluav taws xob tsis muaj zog yuav tsum tau ua tib zoo saib xyuas qhov yuam kev xws li thermoelectric peev xwm, hom kev cuam tshuam, thiab electromagnetic induction. Cov kev ua yuam kev no feem ntau yog nyob ntawm qhov kev txiav txim ntawm 10 μV, uas yuav cuam tshuam loj rau kev ntsuas me me. Siv tib yam khoom, twisted khub los yog shielded test cable tuaj yeem txo qhov yuam kev ntawm thermal EMF thiab electromagnetic induction. Ua ntej ntsuas Ue, koj tuaj yeem txiav txim siab qhov loj me ntawm tag nrho cov kev ua yuam kev qhia los ntawm qhov kev ua yuam kev no, siv "tus txheeb ze" kev ua haujlwm ntawm multimeter kom tshem tawm qhov cuam tshuam ntawm qhov tsis raug, thiab tom qab ntawd ntsuas Ue kom tau txais txiaj ntsig ntau dua.
Ua ntej txuas ob qhov kev xeem coj ntawm multimeter mus rau lub davhlau ya nyob twg C hauv daim duab 1 tib lub sijhawm. Lub sijhawm no, kev nyeem ntawv ntawm multimeter yog tshwm sim los ntawm qhov yuam kev ntawm qhov muaj peev xwm thermoelectric, hom kev cuam tshuam, thiab electromagnetic induction, thiab saib nws cov kev hloov pauv. Yog tias qhov kev nyeem ntawv hloov pauv hauv qhov me me, nws raug suav tias yog qhov yuam kev ruaj khov. Nias lub "kwv tij" cov ntawv qhia zaub mov tseem ceeb ntawm multimeter, multimeter yuav sau cov nqi nyeem tam sim no, thiab rho tawm cov nqi nyeem ntawv los ntawm txhua qhov kev ntsuas tom ntej ua ntej tso tawm, kom qhov cuam tshuam ntawm qhov tsis raug tuaj yeem raug tshem tawm. Tom qab ntawd ntsuas qhov sib txawv ntawm qhov sib txawv ntawm lub davhlau ya nyob twg C thiab "-" davhlau ya nyob twg Ui, thiab kev nyeem ntawv yog tus nqi Ue tom qab tsis suav nrog kev cuam tshuam ntawm qhov tsis raug, uas tuaj yeem cuam tshuam qhov tseeb Ue loj.
