Kev Ntsuam Xyuas Qhov Ntsuas ntawm Voltage ntsuas los ntawm cov multimeters digital thiab analog (pointer) multimeters
Yog tias lub ntsuas hluav taws xob ntsuas yog cov hluav taws xob tseem ceeb, uas yog, nws tsuas yog qhia tau tias kev ntsuas sab hauv yog qhov siab heev. Nyob rau hauv tib zaus, qhov loj tshaj plaws cuam tshuam rau cov ntsuas hluav taws xob tau tshwm sim ntawm qhov sib txawv ntawm qhov sib txawv thiab tsis muaj nyob hauv tib qho kev txiav txim ntawm qhov ntau. Thaum sab hauv kev tawm tsam ntawm cov ntsuas hluav taws xob ntsuas yog me, qhov sib txawv tsis pom tseeb. Thaum sab hauv kev tawm tsam ntawm cov ntsuas ntsuas hluav taws xob yog qhov loj, ntsuas qhov ntsuas tau zoo yuav txawv heev.
In this case, it is possible that the measured voltage is not the actual 220V live wire power supply line, or it is the voltage measured after the live wire passes through some kind of electrical appliance, or it is the voltage of the leakage shell of the electrical appliance.
Tsis suav rau cov kev muaj peev xwm saum toj no, nws tsuas tuaj yeem qhia tau tias ib qho ntawm ob lub multimeters tsis muaj tseeb thiab xav tau kho thiab ntsuas.
Thaum muaj ib qho yuam kev nyob rau hauv voltage ntsuas, ua ntej txhua tus, koj yuav tsum tau xyuas seb qhov zaus ntsuas hluav taws xob yog hauv HZ? Qhov no puas yog voltage ib qho sine yoj ntshiab?
Rau ntau ntau yam tam sim no ntawm kev ua lag luam, lawv phau ntawv qhia qhia txhua qhov kev teb cov lus teb ntau thiab hloov cov kev ntsuas ntawm kev ntsuas hluav taws xob lwm yam voltage. Rau ntau qhov txawv kev ua haujlwm digital, lawv cov lus teb ntau yog feem ntau 40000hz, thiab sine dej tsawg dua lossis sib npaug li 1%). Kev ntsuas ntsuas qhov tseeb ntawm kev ntsuas ntsuas kev hloov hluav taws xob tshaj li qhov tseem ceeb saum toj no tsis tuaj yeem lav. Qhov no yog vim AC / DC (hloov tshiab / ncaj qha rau kev hloov pauv hauv ntau qhov kev siv digital yog qhov pib siv fais fab dualm ofifiing tl062. Lub GBW (nce bandwidth khoom) ntawm cov kev ua haujlwm no tau cuam tshuam nrog kev siv cov khoom siv hluav taws xob ntau ntau zaus, nws tseem muaj cov khoom lag luam hluav taws xob ua rau muaj hluav taws xob ntau).
Raws li rau dav dav analog (pointer) multimeters (uas tau ua ntej tsim los ntawm Asmeskas thiab muaj keeb kwm 100 xyoo), lawv sab hauv cov qauv yog yooj yim heev. Sab hauv, tsuas yog ib qho siab-}} pa taws ua kom muaj zog ntxiv (nyob rau hauv kev ua haujlwm ntau dua ntawm lub taub hau thiab cov hluav taws xob tawm tsam). Yog li ntawd, ntsuas qhov tseeb ntawm hom no ntawm cov qub thiab pheej yig multimeter tsuas tsis tuaj yeem piv nrog cov kev ua kom digital. Feem ntau, cov khoom siv hluav taws xob tawm tsam ntawm qhov kev zam ntau yam tsis muaj kev them nyiaj rau lub peev xwm capusatance, yog li lawv cov lus teb tau ntau yog feem ntau 40-400Hz.
Yog tias qhov sib txawv hauv kev ntsuas tib qho kev hloov ntawm ob lub multiveters yog kaum tawm ntawm cov tshuab hluav taws xob, ua ntej ntawm txhua yam, koj yuav tsum tshuaj xyuas lawv cov nqi resistor tess kom pom tias tus nqi tiv taus hloov. Yog tias txhua yam yog li qub, rau qhov analog multiateter, koj tseem tuaj yeem tshawb xyuas seb tus taw qhia ntawm nws lub taub hau ntsuas taw tes tau taw rau xoom. Rau cov digital motimeter, koj tuaj yeem tshawb xyuas seb qhov ntsuas hluav taws xob ntawm nws cov porterage ntau yog xoob.
Incidentally, yog tias koj xav kom muaj kev ntsuas kom raug qhov kev sib txuas lus ntawm ib qho kev siv hluav taws xob, nws raug pom zoo kom yuav ib lub hauv paus tseeb txhais tau square (trip) multometer. Qhov no zoo ntawm kev siv tshuaj multimimeter tau raug ntsuas kom raug qhov tseeb ntawm ntau yam kev siv hluav taws xob ntawm kev sib tw, thiab cov nthwv dej, thiab nws tsis muaj dab tsi ua rau cov℃degree.
