Txoj kev siv kom raug ntawm pointer type multimeter
Xaiv cov khoom ntsuas thiab qhov hloov pauv ntawm lub multimeter raws li cov khoom ntsuas. Yog tias qhov kev txiav txim ntawm qhov ntsuas qhov ntsuas tau paub, xaiv qhov sib thooj ntawm qhov loj. Yog tias qhov kev txiav txim ntawm qhov loj ntawm qhov ntsuas qhov ntsuas tsis paub, nws yog qhov yuav tsum tau pib ntsuas los ntawm kev xaiv qhov siab tshaj plaws. Thaum lub pointer deviation lub kaum sab xis me dhau los nyeem kom raug, qhov ntau yuav tsum tau txo qis dua.
Yuav siv tus pointer multimeter li cas?
(1) Ua ntej kuaj, ua ntej tso lub multimeter nyob rau hauv kab rov tav lub xeev thiab xyuas seb nws rab koob yog xoom (xws li xoom point ntawm qhov ntsuas tam sim no thiab voltage). Yog tias tsis yog, kho qhov "txhim kho xoom xoom" hauv qab lub taub hau 'meter' kom tus taw tes taw tes rau xoom.
(2) Xaiv cov khoom ntsuas kom raug thiab ntau qhov hloov pauv ntawm lub ntsuas ntsuas raws li cov khoom ntsuas. Yog tias qhov kev txiav txim ntawm qhov ntsuas qhov ntsuas tau paub, ces xaiv qhov sib thooj ntawm qhov loj. Yog tias qhov kev txiav txim ntawm qhov loj ntawm qhov ntsuas qhov ntsuas tsis paub, qhov ntsuas yuav tsum pib los ntawm kev xaiv qhov siab tshaj plaws. Thaum lub pointer deviation lub kaum sab xis me dhau los nyeem kom raug, qhov ntau yuav tsum tau txo qis dua. Qhov ntau yam tsim nyog yog feem ntau raws li lub pointer deflection lub kaum sab xis tsis tsawg dua 30 feem pua ntawm qhov siab tshaj plaws.
Siv lub multimeter ua ammeter:
① Thaum txuas lub multimeter nyob rau hauv series hauv Circuit Court nyob rau hauv kev sim, yuav tsum tau them nyiaj mloog mus rau cov kev taw qhia ntawm tam sim no. Txuas cov hlau lead liab mus rau qhov kawg uas qhov tam sim no ntws mus rau hauv thiab cov hlau lead dub mus rau qhov kawg qhov twg tam sim no ntws tawm. Yog tias koj tsis paub qhov kev taw qhia ntawm qhov ntsuas tam sim no, koj tuaj yeem ua ntej txuas ib qho kev sojntsuam ntawm ib qho kawg ntawm lub voj voog, thiab maj mam kov lwm qhov kev sojntsuam ntawm lwm qhov kawg ntawm lub voj voog. Yog hais tias tus pointer swings mus rau sab xis, nws qhia tau hais tias cov xov hlau yog lawm; Yog hais tias tus pointer swings mus rau sab laug (hauv qab xoom), nws qhia tau hais tias tsis raug. Cov haujlwm ntawm ob qhov kev sojntsuam ntawm lub multimeter yuav tsum tau hloov.
② Thaum lub pointer deflection lub kaum sab xis ntau dua lossis sib npaug li 30 feem pua ntawm qhov siab tshaj plaws, sim xaiv ntau lub zog ntau. Vim tias qhov loj dua qhov ntau, qhov me me ntawm shunt kuj, thiab qhov me dua qhov sib npaug sab hauv ntawm lub ammeter, qhov me dua qhov yuam kev qhia los ntawm kev ntsuas Circuit Court.
③ Thaum ntsuas qhov tam sim no loj (xws li 500mA), tsis txhob txav cov kev xaiv ntau yam hloov thaum lub sij hawm ntsuas kev ntsuas kom tsis txhob arcing thiab hlawv cov kev sib cuag ntawm lub hloov mus.
Siv lub multimeter raws li voltmeter:
① Txuas lub multimeter nyob rau hauv parallel mus rau lub Circuit Court nyob rau hauv kev sim. Thaum ntsuas DC voltage, xyuam xim rau qhov polarity ntawm qhov voltage ntawm qhov ntsuas taw tes, uas yog, txuas cov hlau lead liab mus rau qhov kawg ntawm qhov hluav taws xob siab thiab cov hlau lead dub mus rau qhov hluav taws xob tsawg kawg. Yog tias koj tsis paub qhov polarity ntawm qhov ntsuas qhov voltage, koj tuaj yeem sim tib txoj kev soj ntsuam raws li ua ntej thaum ntsuas tam sim no. Yog hais tias tus pointer yog deflected rau sab xis, koj tuaj yeem mus nrog qhov ntsuas; Yog tias tus pointer deflected mus rau sab laug, lub cwj mem liab thiab xim dub tuaj yeem hloov kho los ntsuas.
② Zoo li lub ammeter tau hais los saum toj no, txhawm rau txo qhov yuam kev los ntawm kev ua haujlwm sab hauv ntawm lub voltmeter, thaum lub pointer deviation lub kaum sab xis siab dua lossis sib npaug li 30 feem pua ntawm qhov siab tshaj plaws, ntau qhov ntau yam yuav tsum raug xaiv rau ntsuas ntau npaum li qhov ua tau. Vim tias qhov loj dua qhov ntau, qhov ntau dua qhov voltage divider tsis kam, thiab ntau dua qhov sib npaug sab hauv tsis kam ntawm voltmeter, qhov me dua qhov yuam kev qhia los ntawm kev ntsuas Circuit Court. Yog tias qhov kev tiv thaiv sab hauv ntawm lub Circuit Court raug kuaj loj, yuav tsum muaj kev tiv thaiv ntau dua ntawm voltmeter kom ua tiav qhov ntsuas qhov tseeb. Nyob rau lub sijhawm no, nws yog ib qho tsim nyog yuav tsum tau siv lub tshuab multimeter nrog qhov siab dua qhov hluav taws xob (siab dua sab hauv) rau kev ntsuas.
③ Thaum ntsuas AC voltage, tsis tas yuav xav txog cov teeb meem polarity, tsuav yog lub multimeter txuas nrog rau ob qhov kawg ntawm cov khoom kuaj nyob rau hauv parallel. Tsis tas li ntawd, feem ntau tsis tas yuav tsum xaiv ntau yam lossis xaiv ib lub multimeter nrog high voltage rhiab heev. Vim hais tias feem ntau, qhov kev tiv thaiv sab hauv ntawm AC lub zog yog me dua li cov kua nplaum. Nws yog ib qho tsim nyog sau cia tias qhov ntsuas AC voltage tsuas tuaj yeem yog sine yoj, thiab nws zaus yuav tsum tsawg dua lossis sib npaug rau qhov tso cai ua haujlwm zaus ntawm multimeter, txwv tsis pub muaj qhov yuam kev tseem ceeb yuav tshwm sim.
④ Tsis txhob txav mus rau qhov kev xaiv hloov pauv thaum ntsuas qhov hluav taws xob ntau dua (xws li 220V) kom tsis txhob tsim cov arc thiab hlawv qhov sib cuag ntawm qhov hloov pauv.
⑤ Thaum ntsuas qhov hluav taws xob siab tshaj lossis sib npaug ntawm 100V, nws yuav tsum tau saib xyuas kev nyab xeeb. Nws yog qhov zoo tshaj plaws los txhim kho ib qho kev sojntsuam nyob rau hauv ib qho ntawm cov Circuit Court raug kuaj thiab tom qab ntawd siv lwm qhov kev sojntsuam los kov lwm qhov kawg ntawm tus tsav sim.
⑥ Hauv cov tshuab hluav taws xob, qib feem ntau yog siv los sawv cev tus nqi zoo ntawm qhov hluav taws xob ntawm qhov taw tes ntawd. Yog li ntawd, lub multimeter muaj ib theem scale ntawm AC voltage ntau, thiab xoom theem yog hais txog lub hwj chim generated ntawm ib tug 600 ohm impedance ntawm 1mW, uas sib raug rau ib tug voltage zoo nqi ntawm 0.75V. . Yog tias qhov impedance ntawm qhov tawg tsis sib npaug ntawm 600 ohms, kev suav yuav tsum tau ua raws li cov qauv hauv qab no: tus nqi hluav taws xob tiag tiag =multimeter dB nyeem ntxiv rau 101g (600 / z). Nyob rau hauv tus qauv, z yog tus nqi tsis kam ntawm qhov ntsuas Circuit Court. Nws yog ib qho tsim nyog sau cia tias qhov ntsuas yuav tsum tau muab tso rau ntawm qib 10V, vim tias qhov ntsuas theem ntawm multimeter yog tsim thiab suav rau qib ntawd. Yog tias qhov ntau yam tsis txaus, nws yuav tsum tau hloov mus rau lwm qib rau kev ntsuas. Lub multimeter tsuas yog tsim nyog rau kev ntsuas qhov ntim thiab zaus, xws li DC voltage ntawm lub voj voog, Nws tseem yuav tsum tau txuas lub 0.1uF / 450V capacitor hauv series kom cais cov DC ua ntej ntsuas nws.
⑦ Thaum ntsuas qhov hluav taws xob hauv qhov hluav taws xob inductive, lub tshuab hluav taws xob yuav tsum raug txiav ua ntej kaw lub hwj chim tom qab ntsuas. Txwv tsis pub, thaum txiav tawm lub hwj chim mov, vim nws tus kheej inductance ntawm inductive reactance Cheebtsam nyob rau hauv Circuit Court, high voltage tej zaum yuav raug generated thiab lub multimeter tej zaum yuav raug hlawv.
