Ob txoj kev ntsuas qhov ntsuas tsis kam siv lub multimeter
Muaj ob hom multimeters, uas tuaj yeem muab faib ua digital multimeters thiab pointer multimeters. Piv nrog rau pointer multimeters, multimeters muaj qhov tseeb dua, ntsuas nrawm dua, cov tswv yim loj dua impedance, muaj zog tshaj qhov muaj peev xwm, thiab ntau lub zog. Lawv yeej nyob raws li lawv lub npe, yog li lawv tau siv dav hauv kev ntsuas hluav taws xob thiab hluav taws xob. Cia peb saib qee yam ntawm lawv txoj kev ntsuas kev tiv thaiv
(1) Ntsuas qhov tsis kam ntawm cov resistor:
Lub multimeter yog siv los ntsuas qhov tsis kam ntawm qhov tsis kam. Ib qho qauv ntawm multimeter ntawm lub khw muaj 200 Ω ntau, 2000 Ω ntau, 20K Ω ntau, 200K Ω ntau, thiab 2000K Ω ntau. Txoj kev ntsuas tshwj xeeb yog raws li hauv qab no:
1. Xaiv lub iav.
Nws yog kwv yees tias tus nqi tsis kam ntawm qhov ntsuas resistor yuav tsis tshaj 20K Ω. Raws li lub hauv paus ntsiab lus hais tias lub iav yuav tsum siab tshaj thiab tus nqi ntawm cov kev ntsuam xyuas resistor yuav tsum yog lub ntsiag to, lub 20K Ω iav yog ntau haum. Yog tias nws tsis tuaj yeem kwv yees tus nqi tiv thaiv, nws raug nquahu kom siv cov iav ntsuas siab tshaj plaws. Yog tias nws pom tias me me dhau lawm, ces hloov nws nrog qhov tsim nyog tiv thaiv iav raws li qhov pom ntawm qhov ntsuas tsis kam thiab rov ntsuas.
2. Txuas cov xov tooj liab thiab dub rau ob tus pins ntawm qhov ntsuas ntsuas.
3. Nyeem ntawm lub vijtsam zaub thiab saib xyuas tus nqi tso tawm, piv txwv li: 1.47, tom qab ntawd qhov ntsuas qhov ntsuas tsis zoo yog "1.47 Ω".
(2) Ntsuas hlau tsis kam:
Qhov kev tiv thaiv ntawm ib lub xaim muaj feem xyuam rau cov khoom siv hluav taws xob, qhov chaw hla ntu, thiab qhov ntev. Rau cov xov hlau uas ua los ntawm cov khoom siv tib yam, qhov qis dua qhov tsis kam ntawm cov tub ntxhais hlau thaum pib ntawm lub hli, thiab qhov ntev ntawm cov tub ntxhais hlau, qhov kev ua haujlwm siab dua. Qhov kev tiv thaiv ntawm cov hlau yog me me, thiab ib qho multimeter feem ntau yog siv los ntsuas hauv 200 Ω ntau. Kev ntsuas ntsuas tau pom hauv daim duab hauv qab no. Yog hais tias qhov kev tiv thaiv ntawm cov hlau kuaj yog infinite, lub hlau yog qhib.
Ceeb Toom: Thaum siv lub tshuab multimeter nrog 200 Ω ntau yam rau kev ntsuas, luv luv Circuit Court ob qhov kev sojntsuam feem ntau yuav ua rau pom qhov tsis muaj nqi tsis yog xoom, feem ntau ntawm ob peb ohms thiab ob peb ohms. Qhov kev tiv thaiv tus nqi no feem ntau yog qhov kev sojntsuam thiab kev ua yuam kev tsis raug nqi. Ib qho kev ua haujlwm siab digital multimeter muaj tus nqi tsawg heev. Vim tias qhov yuav tsum tau muaj kev ntsuas qhov tseeb, yog tias lub tshuab hluav taws xob digital siv rau Ohm zeroing, tus nqi tiv thaiv thaum qhov kev sojntsuam luv luv tuaj yeem raug kaw ua ntej kev ntsuas, thiab qhov tseeb tus nqi ntawm cov khoom ntsuas lossis Circuit Court tuaj yeem tau txais los ntawm kev rho tawm tus nqi tiv thaiv los ntawm tus nqi ntsuas.
