Yuav ua li cas nyeem cov ohms ntawm ib tug multimeter?
Feem ntau muaj peb txheej teev ntawm lub ntsej muag ntawm lub multimeter. Ib qho yog linear scale: voltage thiab tam sim no ntsuas siv qhov ntsuas no. Qhov siab tshaj plaws (rightmost) tus nqi ntawm qhov ntsuas yog qhov ntau ntawm qhov voltage thiab tam sim no, uas tuaj yeem nyeem hauv qhov sib npaug. (Tsuas yog AC voltage 10V block yog cais nyob rau hauv pab pawg no.) Sab hauv feem ntau lub voj voog yog logarithmic nplai - lub ntsuas decibel. Lub voj voog sab nraud yog qhov thaiv thaiv, 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 sib npaug rau qhov kev nyeem saum npoo av uas tau muab faib ua qhov sib npaug.
Chav tsev ntawm tus lej tso tawm hauv 200ohm yog ohm;
Lub tsev tso tawm nyob rau hauv lub iav on-off kuj yog ohms;
Chav tsev ntawm tus lej tso tawm rau ntawm qhov chaw kilo-ohm yog Kohm;
Lub tsev tso tawm hauv megohm yog megohm.
Resistance 200 ohms, chav tsev yog ohms.
2K, 20K units yog kilo-ohms
Yog li, kev nyeem ntawv ntxiv rau chav tsev yog tus nqi tiag tiag
Vim tias qhov siab tshaj plaws ntawm 200 ohms iav yog 200, noj 30 tuaj yeem ua tau
Tab sis 2K qhov siab tshaj plaws yog 2, yuav tsis qhia 30
Qhov siab tshaj plaws ntawm 20K yog 20, nws yuav tsis qhia 30 ib yam.
Yog cov ntawv nyeem tag nrho 1
Nws yog 1 ohm, 1 kilo-ohm, 1 kilo-ohm nyob rau hauv qhov kev txiav txim.
Resistance 200 ohms, chav tsev yog ohms, 2K, 20K units yog kilo-ohms, yog li kev nyeem ntxiv rau chav tsev yog tus nqi tiag tiag vim tias 200 ohms qhov siab tshaj plaws yog 200, noj 30 tuaj yeem ua tau tab sis 2K qhov siab tshaj plaws yog 2, yuav tsis qhia. 30, 20K qhov siab tshaj plaws yog 20, yuav tsis qhia 30, kev nyeem ntawv yog 1, ces, tig, 1 ohm, 1 kilo-ohm, 1 kilo-ohm.
Cov kab saum toj kawg nkaus ntawm lub dial yog qhov ntsuas tsis kam, uas tau sau los ntawm sab xis mus rau sab laug.
Thov nyem qhov no txhawm rau sau cov duab piav qhia
Tus lej:
Ω0; 5; 10; 15; 20; 30; 50; 100; 200; 500; 1K; 4K; ∞
Lub lim tiam ntawm kev xaiv hloov pauv tau muab faib ua tsib thaj chaw:
Qhov saum toj kawg nkaus yog AC voltage iav, thaj tsam thib ob rau sab xis yog cov iav tiv thaiv, lub
Qhov thib peb cheeb tsam yog cov ntaub ntawv xeem transistor, thaj tsam plaub yog DC tam sim no cov ntaub ntawv, thaj tsam thib tsib yog cov ntaub ntawv DC voltage.
Hauv cov iav tiv thaiv muaj tsib lub zog xws li:
X1; X10; X100; X1K; X10K.
Lub hauv paus ntawm kev tiv thaiv yog lub ohm. Thaum nyeem tus nqi, nrog tus pointer nres ntawm tus lej, muab faib los ntawm kev hloov pauv hauv lub iav multiplier, uas yog, tus nqi tiv thaiv tiag tiag.
Piv txwv li: thaum kuaj tsis kam, tus pointer nres ntawm 30 ntawm lub dial resistance scale, lub hloov mus tsoo lub X1 iav, qhov tsis kam yog 30 ohms.
Yog tias qhov hloov mus ua si hauv: X10 iav, nws yog 300Ω, X100 iav yog 3000Ω (3K).
X1K yog 30KΩ, X10K yog 300KΩ.
