Dab tsi txhua tus lej ntawm digital multimeter txhais tau tias
Kev nkag siab yuam kev txog kev xaiv ntawm tsheb multimeters
Multimeters yog qhov tsim nyog rau kev xyaum txhua lub lag luam vim tias lawv yog cov cuab yeej ntsuas uas nquag siv hauv kev saib xyuas. Cov multimeters uas ntau lub lag luam siv yuav tsis, txawm li cas los xij, txaus rau lawv cov kev xav tau.
1. Ua kom pom tseeb ntawm kev ua haujlwm ntau yam thaum tsis quav ntsej cov khoom siv symmetry
Thaum ua ib qho kev yuav khoom, qee cov neeg siv khoom yuav tsom mus rau ntau yam ntawm multimeter functions dua li qhov zoo ntawm cov khoom siv sib xws. Kev sib txawv ntawm kev ua haujlwm tsis tuaj yeem paub txog organically yam tsis muaj cov khoom siv ntxiv. Piv txwv li, qee cov neeg siv tau txais ib lub tshuab ntsuas hauv qhov kev cia siab tias nws yuav tuaj yeem tshawb xyuas qhov pib tam sim no thiab qhov kub thiab txias nyob rau hauv ntau qhov xwm txheej, tab sis lawv hla tawm ntawm kev yuav khoom tshwj xeeb tam sim no clamps thiab ntsuas kub ntsuas. Kev sib txuas kom raug ntawm qee cov khoom siv yog qhov tseem ceeb yog tias koj xav tau lub tsheb multimeter ua rau nws lub peev xwm zoo tshaj plaws. Ntau ntawm cov khoom siv no tau sib xws nrog cov yam ntxwv ntawm lub tsheb multimeter, thiab qee qhov yog qhov tsim nyog.
Inductive pick-ups, roj teeb alligator clips, tshwj xeeb kev sim clips rau SMD thaj Cheebtsam (siv rau kev ntsuas tsis zoo li SMD tsis kam, capacitance, inductance, thiab transistors, uas yuav ua tau nrog ib txhais tes, ua kev ntsuas yooj yim dua), tam sim no sensors, siab. probes, torque probes, thiab IC probes yog cov khoom siv uas feem ntau suav nrog hauv lub tsheb multimeter. Feem ntau, kev saib xyuas siv cov khoom no tsawg dua. Thaum tau txais cov khoom siv, cov tuam txhab kev saib xyuas yuav tsum coj mus rau hauv tus account ntau yam, nrog rau cov neeg siv kev txawj ntse, kev saib xyuas lub tuam txhab nyiaj txiag, thiab kev siv txhua hnub, txhawm rau txiav txim siab zoo tshaj plaws thiab tau txais txiaj ntsig zoo tshaj plaws ntawm cov khoom siv.
2. Muab pov tseg cov cuab yeej zoo vim yog cov lus tsis yooj yim
Qee cov neeg siv khoom xav yuav cov khoom siv hluav taws xob tuaj txawv teb chaws, tab sis thaum lawv kawm tias qhov kev sib txuas lus yog lus Askiv, lawv sai sai tso rau cov khoom siv tsis zoo lossis cov khoom siv ntau dua. Nyob rau hauv qhov tseeb, qhov no tsis yog yuav tsum tau. Nws tsis yog qhov nyuaj rau kev siv vim tias cov haujlwm tseem ceeb ntawm cov multimeters sib txawv yog qhov sib piv thiab ntau lub luag haujlwm raug xaiv nrog cov qauv cim. Koj tuaj yeem paub txoj kev siv sai sai yog tias koj tshawb fawb luv luv.
Multimeters feem ntau tsis ua haujlwm, tab sis ntau lub luag haujlwm tsis tas siv hauv kev saib xyuas.
1. "Tso rau qhov txhaws" rau qee qhov haujlwm
Qee tus neeg ua haujlwm saib xyuas feem ntau ntshai siv multimeter vim lawv txhawj xeeb txog kev puas tsuaj rau cov khoom siv thaum lub sijhawm kuaj, qhov pom tseeb tshaj plaws yog qhov kev sim tam sim no. Txoj kev ntsuas tam sim no tsis nyuaj, xws li qhov pib tam sim no, thawj zaug thiab theem nrab tam sim no ntawm lub tshuab hluav taws xob hluav taws xob, thiab qhov kev sim tam sim no ntawm cov roj injector, muaj ntau qhov yuam kev tuaj yeem pom los ua lub hauv paus rau kev kuaj mob, tab sis cov kws kho mob tsis tshua siv nws. hauv kev saib xyuas. Nws tau nkag siab tias ntau tus kws kho mob ntshai siv qhov kev sim tam sim no vim tias lawv ntshai ntawm "hluav taws kub" lossis ua rau cov khoom puas hauv kev sim vim qhov kev xeem tsis raug. Qhov tseeb, ntau lub multimeters tau tsim nrog cov khoom siv tshwj xeeb hauv Circuit Court lossis cov cuab yeej tiv thaiv kev tiv thaiv txhawm rau tiv thaiv kev sib xyaw ua ke. Piv txwv li, ib qho ntxiv DY2201 multimeter txais cov cuab yeej tiv thaiv kev ntsuas tam sim no txhawm rau tiv thaiv kev siv tsis raug. Tsuas yog thaum kev ntsuas tam sim no raug xaiv, qhov sib txuas "mA" lossis "20A" jack yuav qhib. Txwv tsis pub, nws yuav raug thaiv los ntawm baffle, uas tuaj yeem ua tau zoo kom tsis txhob tso cov kev xeem tsis raug. Cov neeg ua haujlwm saib xyuas tuaj yeem ua siab tawv siv qhov ntsuas tam sim no, tab sis yuav tsum ua haujlwm raws li kev siv.
2. Tsis txaus hais txog qhov ua yuam kev hauv kev sim
Txhua lub cuab yeej yuav muaj qhov yuam kev hauv kev ntsuas, tab sis qhov yuam kev yuav tsum raug txo qis hauv kev ntsuas kom tsis txhob muaj kev ua haujlwm yuam kev kom ntseeg tau qhov tseeb ntawm qhov ntsuas ntsuas. Qhov yuam kev loj uas feem ntau tshwm sim hauv kev siv multimeters yog qee zaum tshwm sim los ntawm cov cuab yeej, thiab qee zaum tshwm sim los ntawm qee yam tib neeg. Ob yam nram qab no yuav tsum tau nyiam cov neeg ua haujlwm saib xyuas: ①Vim qhov tseeb thiab kev daws teeb meem ntawm multimeter tsis txaus, yog tias qhov kev txiav txim tsuas yog raws li kev kwv yees, feem ntau yuav ua rau tib neeg yuam kev. ②Vim txoj kev sim sib txawv ntawm ntau yam multimeters, multimeters yuav muaj lawv tus kheej ntsuas qhov yuam kev hauv cov teeb liab sib txawv. Yog li ntawd, thaum siv multimeters, cov neeg ua haujlwm tu yuav tsum sim siv cov cuab yeej nrog cov qib siab precision, thiab tib lub sijhawm ua raws li cov txheej txheem ua haujlwm nruj me ntsis. txo qhov yuam kev.
Qee qhov haujlwm ntawm multimeter tsis tshua siv hauv kev saib xyuas, lossis lawv cov haujlwm tsis tau siv tag nrho los ntawm cov neeg siv.
1. Kev ntsuas tam sim no tsis tau them nyiaj rau
Tau ntev, qhov kev sim ua haujlwm tam sim no tau raug tsis saib xyuas hauv kev saib xyuas. Nrog rau qhov tshwm sim ntawm ntau thiab ntau cov cuab yeej tshiab ntawm lub tsheb, qee zaum nws tsis tuaj yeem ua qhov kev kuaj mob zoo yam tsis muaj kev sim tam sim no. Rau qee qhov xwm txheej uas nyuaj rau txiav txim siab, xws li: ①Cov roj teeb cov roj teeb luv luv lossis oxidized thiab poob, ua rau nws tus kheej tawm thiab lub zog poob. ② Cov khoom siv hluav taws xob yog tsim los ua kom cov pa tawm, xws li cov txheej txheem rwb thaiv tsev ntawm qee cov kab hauv Circuit Court yog laus lossis poob, ua rau muaj kev sib cuag nrog lwm yam hlau. Hauv cov xwm txheej no, multimeter qhov ntsuas tam sim no tuaj yeem ua ke.
(1) Cov txheej txheem kev ntsuas dej
Thaum ua qhov kev ntsuam xyuas xau, koj yuav tsum siv lub multimeter. Txoj kev tshwj xeeb yog raws li hauv qab no: tua tag nrho cov khoom siv hluav taws xob ntawm lub tsheb, tshem tawm lub qhov hluav taws xob, thiab siv lub clamp tam sim no txuas rau lub tsheb multimeter. Yog tias qhov tam sim no ntws los ntawm lub ntsuas ntsuas yog 10-30mA, nws txhais tau hais tias lub tsheb tsis muaj qhov xau. Hloov pauv, yog tias cov zaub loj dhau lawm, nws tau txiav txim siab tias muaj qhov ua txhaum ntawm lub cev. Nws yuav tsum raug sau tseg tias qee lub tshuab tseem yuav tsum nqus ntau lub zog hauv 15 feeb tom qab kaw qhov hluav taws xob hloov hluav taws xob, yog li yog tias ntsuas tam sim no siab dua 50mA, nws yuav tsum tau sim tom qab 15 feeb. Yog tias nws tseem siab dua 50mA nyob rau lub sijhawm no, nws txhais tau hais tias muaj qhov tshwm sim tawm, thiab yuav tsum kuaj xyuas ntxiv. Nyob rau hauv cov ntaub ntawv ntawm kev lees paub tias muaj cov xau nyob rau hauv lub cev, khaws cov tam sim no clamping tus ncej tsis zoo ntawm lub roj teeb txhua lub sijhawm, thiab koj tuaj yeem tshem tawm cov fuses ib los ntawm ib qho thaum saib qhov kev hloov pauv ntawm tus nqi tam sim no ntawm lub 'meter'. Yog tias tus lej pom ntawm lub ntsuas ntsuas tsis hloov tom qab ib qho fuse raug tshem tawm, nws txhais tau hais tias qhov xau tsis tshwm sim hauv Circuit Court. Yog hais tias tus digital clamp ammeter qhia tau hais tias tus nqi rov qab mus rau qhov qub 10-30mA (tus nqi ib txwm ntawm qee lub tsheb qis dua 50mA, tus nqi tshwj xeeb yog cuam tshuam rau tus qauv), nws txhais tau hais tias qhov tshwm sim ntawm cov dej xau tau raug tshem tawm, uas txhais tau hais tias lub fuse tswj Circuit Court muaj to, grounding los yog luv Circuit Court teeb meem tshwm sim.
(2) Kev kuaj mob sai ntawm cov khoom siv hluav taws xob
Siv qhov kev sim ua haujlwm tam sim no, koj tuaj yeem kuaj xyuas sai sai thiab pom cov laj thawj vim li cas ntau cov khoom siv hluav taws xob hauv lub tsheb, xws li lub teeb taws, lub suab, roj twj tso kua mis relays, lub cev muaj zog rau lub qhov rooj hluav taws xob thiab qhov rais, thiab cov tshuab hluav taws xob, tsis ua haujlwm. Piv txwv li, rau kev kuaj xyuas cov roj twj tso kua mis, yog tias qhov ua haujlwm tam sim no I=4.5A, lub twj tso kua roj roj ua haujlwm ib txwm, yog tias muaj cov roj txiav tawm, nws yog tshwm sim los ntawm kev sib txuas tsis zoo; yog tias ua haujlwm tam sim no I<4.5A, it means that there is resistance in the circuit or The connection is bad, or the fuel tank is too dirty, and impurities block the oil filter, and the oil pump cannot absorb oil, resulting in no-load current; if the operating current I>4.5A, nws txhais tau hais tias cov roj lim yuav raug thaiv lossis qee qhov thaiv, ua rau muaj kev nce ntxiv ntawm cov roj twj tso kua mis. Nyob rau hauv cov ntaub ntawv no, misjudgment ntawm cov roj twj tso kua mis yog heev yooj yim mus tshwm sim, thiab yuav tsum tau them nyiaj mloog mus rau nws thaum lub sij hawm nrhiav tau.
