Kev ntsuam xyuas qhov yuam kev thiab ntsuas qhov ntsuas ntau yam
Thaum siv multimeter los ntsuas, yuav muaj qee qhov yuam kev. Qee qhov tsis raug no yog nyob rau hauv thaj tsam ntawm kev ntsuas qhov tsis raug tso cai los ntawm chav ntsuas qhov tseeb. Qee qhov yog tib neeg yuam kev los ntawm kev siv tsis raug thiab kev hloov kho tsis zoo. Koj tuaj yeem txo qhov kev ntsuas qhov yuam kev yog tias koj nkag siab qhov tseeb ntawm cov khoom siv multimeter thiab cov laj thawj vim li cas kev ntsuas tsis raug, nrog rau thaum koj nkag siab cov txheej txheem ntsuas thiab cov tswv yim tsim nyog.
Ib qho ntawm cov laj thawj uas cuam tshuam rau qhov ntsuas qhov tseeb yog tib neeg kev nyeem ntawv yuam kev. Txawm hais tias nws tsis tuaj yeem zam tau, nws tuaj yeem txo qis. Yog li ntawd, ua tib zoo saib xyuas cov hauv qab no thaum siv:
1 Tso lub multimeter kab rov tav thiab ua ib qho kev hloov kho xoom ua ntej kuaj;
2 Thaum nyeem ntawv, tuav lub ntsej muag ntsug ntawm tus taw tes;
3. Txhua zaus ib lub iav hloov, qhov xoom hloov rau kev ntsuas kev tiv thaiv yuav tsum tau ua. Thaum twg qhov kev hloov kho tsawg dua xoom, hloov lub roj teeb nrog ib qho tshiab.
4. Txhawm rau tiv thaiv shunting ntawm tib neeg lub cev tsis kam, nce kev ntsuas qhov tsis raug, lossis hluav taws xob poob siab, tsis txhob nyem qhov hlau ntawm cov hlau lead nrog koj txhais tes thaum ntsuas qhov tsis kam lossis siab voltage;
5. Tom qab tso tawm cov hluav taws xob khaws cia hauv lub capacitor thiab ntsuas qhov tsis kam ntawm RC Circuit Court, tua lub zog hluav taws xob hauv Circuit Court. Peb txheeb xyuas lwm yam txhaum tom qab tshem tawm cov kev nyeem ntawv yuam kev los ntawm tib neeg.
1. Kev xaiv ntau yam thiab ntsuas qhov tsis raug rau multimeter voltage thiab tam sim no
Kev ntsuas qhov ntsuas qhov tseeb yog feem ntau raug faib ua ntau qib, suav nrog {{0}}.1, 0.5, 1.5, 2.5, thiab 5. Qhov ntsuas qhov tseeb yog teev rau DC voltage, tam sim no, AC voltage, thiab lwm yam iav los ntawm qhov feem pua ntawm qhov siab tshaj plaws kev ntsuas qhov yuam kev X thiab tag nrho cov nqi ntawm qhov kev xaiv. Sau raws li tus qauv: A feem pua = (X/tus nqi tag nrho) 100 feem pua 1
(1) Kev ntsuas qhov yuam kev tshwm sim los ntawm tib qhov hluav taws xob nrog ntau qhov sib txawv ntawm qhov tseeb
(2) Qhov yuam kev uas tshwm sim los ntawm kev siv multimeter nrog ntau qhov sib txawv los ntsuas tib qhov voltage.
Ntsuas 23V tus qauv voltage siv 100V thaiv, thiab lub multimeter yuav qhia kev nyeem ntawv ntawm 20.5V thiab 25.5V. Ntsuas 23V tus qauv voltage siv lub 25V thaiv, thiab lub multimeter yuav qhia ib tug nyeem ntawm 22.375V thiab 23.625V. Raws li cov kev tshawb pom saum toj no, X (100) yog ntau tshaj X (25), qhia tias qhov yuam kev ntawm kev ntsuas qhov ntsuas ntawm 100V yog qhov loj dua qhov ntsuas ntsuas ntawm 25V. Yog li ntawd, thaum lub multimeter ntsuas ntau yam voltages, qhov yuam kev tshwm sim los ntawm ntau yam sib txawv. Cov iav nrog qhov ntsuas qhov tsawg tshaj plaws yuav tsum tau xaiv ntau npaum li qhov ua tau nyob rau hauv rooj plaub ntawm kev sib ntsib tus nqi ntawm lub teeb liab los ntsuas. Qhov ntsuas qhov precision yog nce raws li qhov tshwm sim.
(3) Qhov yuam kev uas tshwm sim los ntawm kev siv lub tshuab multimeter tib yam los ntsuas ob qhov sib txawv voltages.
Nws tuaj yeem pom tias qhov siab tshaj qhov txheeb ze yuam kev ntawm qhov ntsuas qhov ntsuas ntawm 20V thiab 80V yog qhov ntau dua li qhov kawg. Yog li ntawd, leej twg nyob ze rau qhov ntsuas tag nrho yuav muaj qhov tseeb dua thaum siv tib qhov ntau ntawm multimeter los ntsuas ob qhov sib txawv voltages. Raws li qhov tshwm sim, thaum ntsuas qhov hluav taws xob, qhov hluav taws xob yuav tsum tau nthuav tawm tshaj qhov ntau ntawm multimeter los ntawm tsawg kawg 2/3. Tsuas yog nyob rau hauv txoj kev no nws tuaj yeem txo qhov kev ntsuas qhov yuam kev.
2. Kev xaiv ntau yam thiab kev ntsuas hluav taws xob tsis raug
Kev ntsuas hluav taws xob tuaj yeem ntsuas tau nyob rau hauv thaj tsam li ntawm 0 mus rau. Ib qho ohmmeter muaj qhov tsis-linear, tsis sib xws, thiab thim rov qab. Nws yog quantified raws li ib feem pua ntawm cov nplai qhov arc ntev. Tsis tas li ntawd, "central resistance" - qhov sib npaug ntawm qhov nruab nrab ntawm tus lej los ntawm qhov ntsuas qhov ntev ntawm qhov ntev - yog qhov kev tawm tsam sab hauv ntawm txhua qhov ntau. Qhov tam sim no ntws hauv Circuit Court yog ib nrab ntawm tag nrho cov nplai tam sim no thaum ntsuas qhov tsis kam yog sib npaug rau qhov chaw tsis kam ntawm qhov kev xaiv. Qhov ntsuas qhov nruab nrab yog qhia los ntawm tus pointer. Raws li cov qauv hauv qab no, nws yog qhov tseeb:
R feem pua =100 feem pua (R/center resistance)...2
