Yuav ua li cas lub clamp ammeter ua haujlwm thiab yuav siv li cas
Lub input impedance ntawm analog (pointer) multimeters siv nyob rau hauv thaum ntxov hnub yog tsawg heev, uas muaj kev cuam tshuam loj heev rau hluav taws xob circuits thaum ntsuas. Thaum kuaj tsis kam nrog hom ntsuas no, qhov hluav taws xob ntawm 9V feem ntau yog siv, yog li nws yooj yim rau kev puas tsuaj rau cov khoom siv hluav taws xob. Nyob rau hauv xyoo tas los no, tshiab digital multimeters (DMMs) tau siv dav.
Nws cov input impedance siab, thiab nws qhov tseeb thiab kev nyab xeeb yog superior rau analog meters. Qhov hluav taws xob thaum ntsuas kev ntsuas kuj tseem qis (feem ntau 5V, Fluke yog 3.5V), yog li nws yuav tsis ua rau cov khoom ntawm txhua lub sensor. Tab sis kuj tseem muaj teeb meem nrog lub rooj xov tooj. Nws tsis tuaj yeem tso saib cov ntaub ntawv ntawm qhov nce lossis txo qhov ntsuas kev nyeem ntawv. Thaum lub sij hawm tso tawm emission xeem thiab kev ntsuam xyuas lub cav, nws pom tau hais tias ib tug ntshiab digital meter tsis tuaj yeem muab cov nqi sib txawv ruaj khov. Fluke tau kov yeej qhov tsis txaus ntawm cov ntsuas digital thiab hloov lawv nrog analog / digital ua ke ntsuas. Nws muaj ob qhov zoo ntawm lub ntsuas ntsuas digital thiab qhov zoo ntawm analog meter rau kev ntsuas dynamic.
Kev txiav txim siab rau kev kuaj mob
Thaum tshawb nrhiav qhov tsis raug ntawm qhov hluav taws xob ntawm lub tsheb, qhov tseem ceeb tshaj plaws yog cov txheej txheem kev xav ntawm qhov ua rau qhov txhaum. Cov txheej txheem no tseem ceeb heev. Qhov no yog vim tias koj tsis tuaj yeem pom qhov xwm txheej sab hauv thiab tsis tuaj yeem rhuav tshem ntau cov khoom xws li cov khoom siv tshuab. Los ntawm kev siv logic thiab cov kauj ruam tsim nyog, cov teeb meem tuaj yeem txheeb xyuas sai. Cov cuab yeej tseem ceeb hauv cov txheej txheem no yog multimeter.
Cov chav kawm ntawm cov teeb liab
Cov teeb liab kuaj feem ntau suav nrog voltage, tam sim no, thiab tsis kam. Tab sis feem ntau siv yog voltage. Cov teeb meem muaj xws li: Puas muaj hluav taws xob tam sim no? Tus nqi voltage yog dab tsi? Dab tsi yuav tsum yog tus nqi ib txwm? Dab tsi yog qhov voltage poob ntawm cov khoom siv lossis qhov txuas txuas? Piv txwv li, yog hais tias tus input voltage ntawm ib tug relay yog 12.8V thiab lub output davhlau ya nyob twg yog 9.2V, qhov voltage poob yog 3.6V. Thov nco ntsoov tias cov pob qij txha ntawm cov xov hlau yuav tsum raug suav hais tias yog cov khoom sib txuas thiab yuav ua kom muaj hluav taws xob poob. Yog li ntawd nws kuj yuav ua rau malfunctions.
Kev kuaj xyuas qhov tsis raug hauv tsheb siv analog / digital multimeters
Raws li cov txheej txheem sib txawv, cov teeb meem hluav taws xob hauv tsheb tuaj yeem muab faib ua ob peb pawg. Thov nco ntsoov tias qhov ua txhaum tiag tuaj yeem tshwm sim hauv ib lub kaw lus, thaum qhov kev sim tshwm sim tuaj yeem tshwm sim hauv lwm qhov system. Cov kab ke them los ntawm phau ntawv no feem ntau suav nrog: them nyiaj; Pib qhov system; Roj / cua system; Ignition system; Lub cev / cav tswj / txias system.
Cov neeg feem coob tsis nqa tsheb mus rau lub khw kho kom txog thaum nws pib tsis tau. Tus neeg tsav tsheb yog thawj zaug pom qhov ua haujlwm tsis zoo. Yog li qhov kev sib tw loj tshaj plaws yog los txiav txim siab seb qhov system twg ua rau tsis muaj peev xwm pib. Qee qhov kev ua txhaum yog tsim los ntawm kev sib txuas mus ntev, xws li rov ua hluav taws xob, teeb meem pib rau hnub kub, thiab lwm yam. Thaum lub kaw lus uas yuav ua rau muaj qhov tsis zoo, nws tuaj yeem kuaj tau siv Fluke multimeter.
