Digital multimeter yog ib qho ntawm cov cuab yeej siv digital tshaj plaws niaj hnub no.
Cov kev daws teeb meem muaj zog, kev ua haujlwm zoo tshaj plaws, ntsuas nrawm nrawm, cov khoom siv tau yooj yim, muaj peev xwm lim dej muaj zog, siv hluav taws xob, yooj yim nqa. Txij li thaum xyoo 1990, digital multimeter tau nrov thiab siv dav hauv Suav teb, thiab tau dhau los ua cov cuab yeej tsim nyog rau kev ntsuas hluav taws xob niaj hnub thiab kev ua haujlwm, thiab maj mam hloov cov tshuaj analogue (ie pointer) multimeter.
Digital multimeter tseem hu ua digital multi-meter (DMM), uas muaj ntau hom thiab qauv. Txhua tus neeg ua haujlwm hauv hluav taws xob xav kom muaj qhov zoo tshaj plaws digital multimeter. Cov ntsiab cai ntawm kev xaiv digital multimeter muaj ntau, thiab qee zaum kuj txawv ntawm ib tus neeg mus rau lwm tus. Tab sis rau lub handheld (pocket) digital multimeter, yuav tsum muaj cov yam ntxwv hauv qab no: cov zaub ntshiab, qhov tseeb, siab daws teeb meem, kev sim ntau yam, ua tiav cov haujlwm ua tiav, muaj peev xwm tiv thaiv kev cuam tshuam, kev tiv thaiv Circuit Court kuj ua tiav, zoo nkauj tsos, siab dav. , yooj yim rau kev khiav lag luam, hloov tau yooj yim, txhim khu kev qha, qis zog noj, portable, pheej yig thiab lwm yam.
Cov cim tseem ceeb, tso saib cov khoom thiab cov yam ntxwv ntawm digital multimeter
Cov khoom siv digital multimeter feem ntau yog {{0}}/2 ~ 8 1/2 ntsis. Muaj ob lub hauv paus ntsiab lus rau kev txiav txim siab tus naj npawb ntawm cov khoom siv ntawm cov cuab yeej digital: ib qho yog tias nws tuaj yeem tso saib tag nrho cov lej ntawm 0-9 hauv cov lej; Lwm qhov yog tias tus lej tus nqi ntawm qhov feem me me yog tus lej siab tshaj plaws ntawm qhov siab tshaj plaws cov khoom muaj nqis raws li tus lej, nrog rau tag nrho ntawm cov suav tus nqi ntawm 2, 000, uas qhia tau hais tias qhov ntsuas muaj peb tus lej lej. , thiab feem ntawm tus lej ntawm cov feem me me yog 1, thiab tus lej yog 2, nws yog hu ua 3 1/2 ntsis. ntsis, nyeem li "peb thiab ib nrab", nws * siab me ntsis tsuas tuaj yeem tso saib 0 lossis 1 (0 feem ntau tsis tso tawm).3 2/3 ntsis (nyeem li "peb" thiab ob feem peb me ntsis") cov multimeter lub siab tshaj plaws me ntsis tsuas tuaj yeem tso saib 0 ~ 2 ntawm tus lej, yog li * loj zaub tus nqi ntawm ± 2999. Nyob rau hauv tib rooj plaub, nws yog ntau tshaj 3 2/ 3 ntsis (nyeem li "peb thiab ob feem peb") digital multimeter's siab tshaj me ntsis tsuas tuaj yeem tso saib 0 ~ 2 ntawm tus lej, yog li qhov * loj zaub tus nqi rau ± 2999. Nyob rau tib lub sijhawm, nws yog 50% siab dua qhov txwv ntawm 3 1/2 tus lej digital multimeter, tshwj xeeb tshaj yog nyob rau hauv qhov ntsuas ntawm 380V AC voltage yog qhov tseem ceeb heev.
Nrov digital multimeter feem ntau belongs rau 3 1/2 ntsis zaub handheld multimeter, 4 1/2, 5 1/2 ntsis (6 ntsis hauv qab) digital multimeter muab faib ua handheld, desktop ob. 6 1/2 ntsis saum toj no feem ntau ntawm cov digital multimeter belongs rau lub desktop.
Digital multimeter siv cov thev naus laus zis thev naus laus zis thev naus laus zis, ua kom pom tseeb thiab nkag siab, nyeem ntawv raug. Nws tuaj yeem ua kom lub hom phiaj ntawm kev nyeem ntawv, tab sis kuj ua raws li tib neeg txoj kev nyeem ntawv, tuaj yeem ua kom luv luv nyeem ntawv lossis kaw lub sijhawm. Cov kev zoo no yog cov tsoos analogue (ie pointer) multimeter tsis muaj.
Qhov tseeb (precision)
Qhov tseeb ntawm cov digital multimeter yog kev sib xyaw ua ke ntawm cov txheej txheem thiab qhov tsis raug hauv qhov ntsuas ntsuas. Nws qhia txog qhov sib npaug ntawm qhov ntsuas tus nqi thiab tus nqi tseeb, thiab tseem qhia txog qhov loj ntawm qhov ntsuas qhov yuam kev. Feem ntau hais lus, qhov raug siab dua, qhov me me ntawm qhov ntsuas qhov yuam kev, thiab rov ua dua.
Qhov tseeb ntawm digital multimeter yog zoo dua li analogue pointer multimeter. Qhov tseeb ntawm multimeter yog qhov ntsuas tseem ceeb heev, uas qhia txog qhov ua tau zoo thiab cov txheej txheem muaj peev xwm ntawm multimeter, qhov tseeb ntawm cov multimeter tsis zoo yog qhov nyuaj rau kev nthuav qhia tus nqi tseeb, uas yooj yim rau kev txiav txim siab ntawm kev ntsuas.
Kev daws teeb meem (kev daws teeb meem)
Digital multimeter nyob rau hauv qhov qis tshaj voltage ntau ntawm 1 lo lus kawg sib raug rau tus nqi hluav taws xob, hu ua kev daws teeb meem, uas qhia txog qhov ntsuas rhiab heev. Lub zog daws teeb meem ntawm digital multimeter nce nrog cov lej tso saib. Cov lej sib txawv ntawm digital multimeter tuaj yeem ua tiav qhov kev daws teeb meem siab tshaj plaws yog qhov sib txawv.
Digital multimeter daws teeb meem index kuj siv tau los qhia qhov kev daws teeb meem. Kev daws teeb meem yog qhov feem pua ntawm tus lej tsawg tshaj plaws (tshwj tsis yog xoom) thiab tus lej loj tshaj plaws uas tus ntsuas tuaj yeem tso tawm.
Nws yuav tsum raug sau tseg tias kev daws teeb meem thiab qhov tseeb yog ob lub ntsiab lus sib txawv.
