Digital multimeter ohm nplai nyeem ntawv
Feem ntau muaj peb txheej ntawm cov nplais ntawm qhov chaw ntawm lub multimeter. Ib txheej yog ib qho kev ntsuas kab: ob qho tib si voltage thiab tam sim no siv cov txheej txheem no. Tus nqi siab tshaj plaws ntawm pab pawg no ntawm qhov ntsuas (qhov kawg kawg) yog qhov ntau ntawm qhov hluav taws xob thiab qhov tam sim no, uas tuaj yeem nyeem hauv qhov sib npaug. (Tsuas yog AC voltage 10V iav hauv pab pawg no yog ywj siab.) Lub voj voog sab hauv tshaj plaws yog qhov ntsuas logarithmic - lub ntsuas decibel. Lub nplhaib sab nraud yog qhov thaiv hluav taws xob, thiab txoj kev nyeem ntawv yog los ntawm sab xis mus rau sab laug. Sab xis yog 0 thiab sab laug yog infinity. Qhov chaw tiv thaiv yog lub hauv paus tsis kam ntawm lub thaiv. Tus nqi tiag tiag yog qhov kev nyeem saum npoo av sib npaug los ntawm kev nthuav dav.
Thaum mus txog qhov chaw 200ohm, cov chav digital tso tawm yog ohms;
Lub tsev tso tawm kom pom rau ntawm lub iav tawm kuj yog ohms;
Thaum lub kilo-ohm ntau npaum li cas mus txog, lub tsev digital tso tawm yog Kohm;
Chav tsev tso tawm hauv megaohm ntau yog megaohms.
Cov qib tsis kam yog 200 ohms, chav tsev yog ohms,
Cov units ntawm 2K thiab 20K yog ob qho tib si kilohms.
Yog li ntawd, kev nyeem ntawv ntxiv rau chav tsev yog tus nqi tiag tiag.
Vim tias qhov siab tshaj plaws ntawm 200 ohm ntau yog 200, 30 yog qhov zoo.
Tab sis qhov siab tshaj plaws ntawm 2K yog 2, thiab 30 yuav tsis tso tawm.
Qhov siab tshaj plaws ntawm 20K yog 20, thiab 30 yuav tsis tso tawm.
Yog cov ntawv nyeem tag nrho 1
Qhov kev txiav txim yog 1 ohm, 1 kilo ohm, 1 kilo ohm
Qhov kev tawm tsam yog 200 ohms, thiab chav tsev yog ohms. Cov units ntawm 2K thiab 20K yog ob qho tib si kiloohms. Yog li ntawd, kev nyeem ntawv ntxiv rau chav tsev yog tus nqi tiag tiag. Vim tias qhov siab tshaj plaws ntawm 200 ohm ntau yog 200, koj tuaj yeem xaiv 30, tab sis qhov siab tshaj plaws ntawm 2K yog 2, thiab 30 yuav tsis tso tawm. , qhov siab tshaj plaws ntawm 20K yog 20, thiab 30 yuav tsis tso tawm. Yog tias kev nyeem ntawv tag nrho yog 1, lawv yog 1 ohm, 1 kilo ohm, thiab 1 kilo ohm.
Lub lim tiam ntawm kev hloov pauv tau muab faib ua tsib thaj chaw:
Sab saum toj kawg nkaus yog qib AC voltage, thiab thaj tsam thib ob rau sab xis yog qib tsis kam.
Qhov thib peb cheeb tsam yog qhov ntsuas transistor, thaj tsam plaub yog theem DC tam sim no, thiab thaj tsam thib tsib yog qib DC voltage.
Muaj tsib lub zog hauv cov iav tiv thaiv:
X1;X10;X100;X1K;X10K
Qhov tseem ceeb ntawm kev tiv thaiv yog ohms. Thaum nyeem tus nqi, muab ntau tus lej uas tus pointer nres los ntawm lub iav magnification ntawm qhov hloov kom tau txais qhov tseeb ntawm qhov tsis kam.
Piv txwv li: thaum kuaj qhov tsis kam, tus pointer nres ntawm 30 ntawm qhov ntsuas tsis kam ntawm lub dial, thiab qhov hloov pauv yog nyob rau hauv X1 txoj hauj lwm, ces qhov kev tawm tsam yog 30 ohms.
Yog tias qhov hloov pauv nyob rau hauv: X10 txoj haujlwm, nws yog 300Ω, X100 txoj haujlwm yog 3000Ω (3K),
X1K qib yog 30KΩ, X10K qib yog 300KΩ
Cov seem tuaj yeem txiav tawm.
