Yuav ua li cas dial indicators txawv ntawm digital multimeters
Pointer multimeter yog ib hom kev ntsuas qhov nruab nrab tus nqi, nws muaj intuitive, duab ntawm cov lus qhia nyeem. Cov multimeter digital yog ib qho cuab yeej siv tam sim ntawd, nws siv 0.3 vib nas this sampling cov txiaj ntsig tsuas yog zoo sib xws, tsis zoo ib yam, nyeem cov txiaj ntsig tsis yooj yim heev.
Pointer multimeter feem ntau tsis muaj lub tshuab hluav taws xob sab hauv, yog li kev tiv thaiv sab hauv me me, xws li MF-10 hom, DC voltage rhiab heev ntawm 100 kilo-ohm / volt. MF-500 muaj DC voltage rhiab heev ntawm 20 kOhm/volt. Cov multimeter digital, ntawm qhov tod tes, tuaj yeem ua kom muaj qhov loj hauv kev tiv thaiv vim yog lub hauv paus op amp Circuit Court. Feem ntau nyob rau hauv 1M ohms los yog ntau dua, uas ua rau muaj kev cuam tshuam rau lub ntsuas hluav taws xob ntsuas tau me dua, ntsuas qhov tseeb dua.
Pointer multimeter vim qhov me me sab hauv tsis kam, thiab ntau cov khoom sib cais ua ib qho shunt thiab voltage divider circuit. Yog li cov yam ntxwv zaus tsis sib xws (xws li digital), thaum cov yam ntxwv zaus ntawm tus pointer multimeter kuj zoo.
Pointer multimeter sab hauv qauv yog yooj yim, yog li tus nqi qis, tsawg zog, kev saib xyuas yooj yim, dhau-tam sim no tshaj-voltage muaj peev xwm muaj zog. Digital multimeter sab hauv siv ntau yam oscillation, amplification, zaus division, tiv thaiv thiab lwm yam circuits thiaj li muaj nuj nqi, xws li ntsuas kub. Ntau zaus (nyob rau hauv qis qis), capacitance, inductance, lossis teeb liab generator thiab lwm yam. Vim yog cov qauv sab hauv ntawm ntau qhov sib xyaw ua ke, yog li lub peev xwm overload tsis zoo, tom qab kev puas tsuaj feem ntau tsis yooj yim kho.
Pointer multimeter tso zis voltage yog siab dua, tam sim no kuj loj (xws li MF-500 * 1 ohm iav siab tshaj plaws ntawm 100 mA los yog li ntawd) tuaj yeem yooj yim rau kev sim SCR, lub teeb-emitting diodes thiab lwm yam. Cov digital multimeter tso zis voltage yog tsawg (feem ntau tsis ntau tshaj 1 volt). Rau qee qhov tshwj xeeb voltage yam ntxwv ntawm cov khoom ntawm qhov kev sim tsis yooj yim (xws li, silicon tswj, lub teeb-emitting diodes, thiab lwm yam).
Ceeb toom
1>Kev ntsuas tam sim no thiab qhov hluav taws xob tsis tuaj yeem xaiv lub iav tsis raug. Yog hais tias qhov tsis ncaj ncees lawm tiv thaiv iav los yog tam sim no iav los ntsuas qhov voltage, nws yooj yim heev rau hlawv lub 'meter'. Thaum lub multimeter tsis siv, nws yog qhov zoo tshaj rau tig lub iav mus rau qib siab tshaj plaws ntawm AC voltage kom tsis txhob muaj kev puas tsuaj vim kev siv tsis raug.
2>Thaum ntsuas tam sim no thiab voltage thiab DC tam sim no, xyuam xim rau qhov polarity ntawm "+" thiab "-" thiab tsis txhob txuas qhov tsis ncaj ncees lawm. Yog tias koj pom tias tus pointer pib thim rov qab, ob qho tib si yuav tsum tam sim ntawd hloov lub meter stick kom tsis txhob muaj kev puas tsuaj rau tus taw tes thiab lub taub hau meter.
3>Yog tias koj tsis paub qhov loj ntawm qhov ntsuas qhov ntsuas hluav taws xob lossis qhov tam sim no, koj yuav tsum siv qib siab tshaj plaws ua ntej, thiab tom qab ntawd xaiv cov qib tsim nyog los ntsuas, thiaj li tsis ua rau lub taub hau 'meter' puas los ntawm ntau dhau ntawm cov koob. Qhov ze ntawm cov iav xaiv yog rau qhov ntsuas tus nqi, qhov tseeb dua qhov ntsuas tus nqi yuav yog.
4>Thaum ntsuas qhov kev tiv thaiv, tsis txhob kov qhov liab qab ntawm cov khoom (los yog cov hlau ntawm ob lub tuav) nrog koj txhais tes, kom tsis txhob muaj kev sib txuas ntawm tib neeg lub cev tiv thaiv thiab ntsuas qhov ntsuas, uas yuav ua rau kev ntsuas. tshwm sim tsis raug.
5>Kev ntsuas ntawm kev tiv thaiv, xws li ob lub bar luv luv, kho qhov "zero ohm" pob qhov rooj mus rau qhov siab tshaj plaws, tus pointer tseem tsis tau txog 0, qhov tshwm sim no feem ntau tshwm sim los ntawm qhov tsis txaus ntawm lub roj teeb hauv lub rooj yuav tsum hloov nrog cov roj teeb tshiab tuaj yeem ntsuas qhov tseeb.
6>Thaum lub multimeter tsis siv, tsis txhob xaiv cov iav tiv thaiv, vim tias muaj lub roj teeb sab hauv, xws li kev ua yuam kev yooj yim ua rau ob lub pas nrig kov lub luv luv, tsis yog tsuas yog haus lub roj teeb xwb, tab sis kuj yog qhov mob hnyav, txawm tias ib qho luv luv. Qhov no yuav tsis tsuas yog haus lub roj teeb xwb, tab sis kuj ua rau lub taub hau 'meter' ua rau mob hnyav.
