1. Xaiv los ntawm kev ua haujlwm
Ntxiv rau tsib lub luag haujlwm ntawm kev ntsuas AC thiab DC voltage, AC thiab DC tam sim no, thiab tsis kam, lub ntsuas ntsuas tam sim no kuj muaj cov lej suav, ntsuas tus kheej, nyeem ntawv tuav, nyeem ntawv yuam kev, diode nrhiav, lo lus xaiv ntev, IEEE{{ 1}} Interface lossis RS -232 interface thiab lwm yam haujlwm yuav tsum raug xaiv raws li cov cai tshwj xeeb.
2. Xaiv los ntawm qhov raug
Qhov siab tshaj plaws kev ua yuam kev ntawm clamp meter nyob ntawm tsis yog tsuas yog nyob ntawm nws lub sij hawm sib txawv ntawm qhov yuam kev, tab sis kuj nyob ntawm nws lub sij hawm ruaj khov. Thaum xaiv, nws kuj nyob ntawm qhov yuav tsum tau muaj kev ruaj ntseg yuam kev thiab linear yuam kev, thiab seb qhov kev daws teeb meem ua tau raws li qhov yuav tsum tau ua. Yog hais tias qhov dav dav digital multimeter xav tau qib {{{0}}}02 txog 0.05, tsawg kawg yog 4 thiab ib nrab tus lej yuav tsum tau tso tawm; qis dua qib 0.1, tsawg kawg 3 thiab ib nrab tus lej yuav tsum tau muab tso tawm.
Clamp meters muaj ntau qhov ntau, tab sis lawv qhov ntau yam yog qhov tseeb tshaj plaws. Ntau lub clamp meters muaj kev ua haujlwm tsis siv neeg, uas ua rau kev ntsuas yooj yim, nyab xeeb thiab nrawm yam tsis muaj kev hloov kho ntawm ntau yam. Kuj tseem muaj ntau cov digital multimeters nrog ntau tshaj qhov muaj peev xwm. Thaum ntsuas tus nqi siab tshaj qhov ntau tab sis tsis tau mus txog qhov siab tshaj plaws, nws tsis tas yuav hloov qhov ntau, yog li txhim kho qhov raug thiab daws teeb meem.
Piv nrog rau digital multimeter, analog clamp meter muaj qhov qis dua ntawm qhov raug, DC voltage qhov tseeb yog qhov pib ntawm 1.5 txog 2.5, thiab AC voltage qhov tseeb yog 2.5 txog 5.
3. Xaiv raws li qhov siab tshaj plaws
Feem ntau clamp meters tsis tsuas yog muaj ntau yam kev faib tawm, tab sis kuj muaj qhov siab tshaj plaws ntau yam. Feem ntau hais lus, qhov hluav taws xob DC tuaj yeem ncav cuag 1000 V thiab tam sim no tuaj yeem ncav cuag 20 A, thiab AC voltage tuaj yeem ncav cuag 750 V lossis 1 000 V. Qhov tam sim no zoo ib yam li 20A. Nws yuav tsum tau muab sau tseg tias lub hauv paus ntsiab lus ntawm kev ntsuas ntawm qhov loj tam sim no yog los hloov cov nqi tam sim no rau hauv tus nqi hluav taws xob los ntawm shunt, yog li nws yuav muaj qee yam cuam tshuam rau nws qhov tseeb. Qhov kev tiv thaiv ntau yog 20 MΩ txog 200 MΩ, uas tuaj yeem ua tau raws li qhov xav tau ntawm kev siv. Txawm li cas los xij, feem ntau analog multimeters muaj tsawg dua, thiab qhov siab tshaj plaws AC thiab DC voltage ntau yog 500 V, thiab AC thiab DC tam sim no feem ntau yog 0.5 A lossis 5 A, uas tej zaum yuav tsis ua raws li cov kev xav tau ntawm qee cov neeg siv.
