Dab tsi yog qhov digital multimeter specifications thiab txoj kev ntsuas?
1. Kev daws teeb meem, cov khoom, thiab cov lus suav
Kev daws teeb meem yog lub peev xwm multimeter kom pom cov cim feeb thaum ntsuas. Koj tuaj yeem txiav txim siab yog tias tus multimeter tuaj yeem kuaj xyuas feeb hloov ntawm lub teeb liab raug saib xyuas los ntawm kev paub txog qhov kev daws teeb meem ntawm multimeter. Lub DMM tuaj yeem kuaj pom qhov hloov pauv ntawm 1mV (1/1000 ntawm V) thaum nyeem 1V, piv txwv li, yog tias nws muaj kev daws teeb meem ntawm 1mV ntawm 4V ntau yam.
Koj yuav tsis yuav tus kav nrog qhov tsawg kawg nkaus ntawm 1 nti (los yog 1 cm) yog tias koj xav tau ntsuas qhov ntev mus rau qhov tsawg kawg nkaus ntawm 1/4 nti (los yog 1 hli). Yog tias qhov ntsuas kub nyob ib puag ncig yog 98.6 degrees Fahrenheit, tus pas ntsuas kub uas ntsuas tag nrho cov degrees tsis pab ntau. Yuav tsum muaj tus ntsuas kub nrog 0.1 degree daws teeb meem.
Cov ntsiab lus "ntsis" thiab "cov lus" yog siv los ua tus yam ntxwv ntawm multimeter qhov kev daws teeb meem. Lawv tuaj yeem muab faib ua pawg raws li qhov ntau ntawm cov lus lossis cov lej ntawm DMM qhia.
Peb tus lej tag nrho (0 txog 9) tau pom nyob rau ntawm 312-digit multimeter, nrog rau "ib nrab tus lej" (uas yog qhia tus lej "1" lossis yog sab laug). Cov zaub daws teeb meem ntawm 312- lej multimeter tuaj yeem ncav cuag 1,999 suav. Cov zaub daws teeb meem rau 412- lej multimeter yog txog 19,999 suav. Siv "cov lus" uas tsis yog "ntsis" tuaj yeem ua tau zoo dua qhov kev daws teeb meem ntawm multimeter. Qhov kev daws teeb meem tam sim no ntawm 312- lej multimeters tuaj yeem ncav cuag 3,200, 4, 000, lossis 6, 000 suav.
A 3,200 suav multimeter muaj kev daws teeb meem zoo dua rau ntau yam kev ntsuas. Piv txwv li, 1, 999- tus lej multimeter tsis tuaj yeem ntsuas 0.1V thaum ntsuas 200V lossis siab dua. Thiab thaum ntsuas voltages txog 320V, 3,200M multimeter tuaj yeem pom txog 0.1V. Kom txog rau thaum qhov hluav taws xob dhau 320V, qhov kev daws teeb meem no sib npaug rau qhov kim dua 20,{14}} suav multimeter.
2. Qhov tseeb
Qhov siab tshaj plaws tso cai yuam kev nyob rau hauv predetermined kev khiav hauj lwm tej yam kev mob yog hu ua qhov tseeb. Hauv lwm lo lus, qhov tseeb piav qhia tias qhov teeb meem raug ntsuas li cas thiab qhov ntsuas tus nqi tau nthuav tawm los ntawm digital multimeter sib phim.
Ib qho digital multimeter qhov tseeb yog feem ntau teev raws li feem pua ntawm kev nyeem ntawv. Nrog 1 feem pua kev nyeem ntawv raug, yog tias qhov kev nyeem ntawv ntawm 100V tau nthuav tawm, qhov tseeb qhov hluav taws xob yuav nyob nruab nrab ntawm 99V thiab 101V.
Ib qho me ntsis ntau ntxiv tuaj yeem ntxiv rau qhov yuav tsum tau muaj qhov tseeb hauv cov lus qhia tshwj xeeb. Tus naj npawb ntawm cov lus uas tuaj yeem ua rau tus lej zoo tshaj plaws ntawm tus nqi tso tawm kom hloov pauv yog sawv cev los ntawm ntau yam. Yog li ntawd, qhov tseeb hauv qhov piv txwv saum toj no tuaj yeem sau ua "(1 feem pua ntxiv rau 2). Raws li qhov tshwm sim, txawm tias cov zaub hais tias 100V, qhov hluav taws xob tiag tiag yog nyob nruab nrab ntawm 98.8V thiab 101.2V.
Ib qho analog multimeter's parameters yog tsim los ntawm qhov tsis raug tag nrho es tsis yog los ntawm feem pua ntawm cov nqi tso tawm. Analog multimeter qhov tseeb feem ntau nyob nruab nrab ntawm 2 feem pua thiab 3 feem pua ntawm tag nrho cov nplai. Qhov tseeb poob rau 20 feem pua lossis 30 feem pua ntawm kev nyeem ntawv ntawm 1/10 tag nrho. DMM qhov tseeb qhov tseeb feem ntau yog raws li kev nyeem ntawv ntawm (0.7 feem pua) txog (0.1 feem pua) ntxiv rau 1 lossis zoo dua.
3. Ohm txoj cai
Cov mis rau ib qho hluav taws xob hluav taws xob, tam sim no, thiab kev tiv thaiv yog hu ua Ohm txoj cai, uas hais tias "voltage sib npaug tam sim no lub sij hawm tsis kam." Yog li ntawd, tus nqi thib peb hauv cov qauv no tuaj yeem tshawb pom yog tias thawj ob tus lej paub. Ohm txoj cai yog ntsuas ncaj qha thiab pom los ntawm digital multimeters thaum ntsuas qhov tsis kam, tam sim no, lossis voltage. Txoj kev yooj yim tshaj plaws los ntsuas qhov tsim nyog tsis siv lub tshuab digital multimeter tau piav qhia hauv qab no.
