Dab tsi yog technical parameters thiab ntsuas txoj hauv kev ntawm digital multimeter
1. Kev daws teeb meem, Lo lus suav, thiab cov khoom siv
Kev daws teeb meem yog hais txog lub peev xwm ntawm multimeter kom paub qhov txawv me me thaum ntsuas. Paub txog qhov kev daws teeb meem ntawm multimeter tuaj yeem txiav txim siab seb nws puas tuaj yeem soj ntsuam cov kev hloov me me hauv cov teeb liab ntsuas. Piv txwv li, yog tias lub tshuab hluav taws xob digital muaj qhov kev daws teeb meem ntawm 1mV ntawm 4V ntau yam, nws qhia tau tias nws tuaj yeem soj ntsuam qhov hloov ntawm 1mV (1/1000 V) thaum nyeem 1V.
Yog tias koj yuav tsum ntsuas qhov ntev tsawg kawg nkaus ntawm 1/4 nti (los yog 1 millimeter), koj yuav tsis yuav tus pas ntsuas qhov tsawg kawg nkaus ntawm 1 nti (los yog 1 centimeter). Yog tias qhov kub ib txwm yog 98.6 degrees Fahrenheit, tus pas ntsuas kub uas ntsuas tau tag nrho cov degrees tsis muaj txiaj ntsig zoo. Koj xav tau tus pas ntsuas kub nrog qhov kev daws teeb meem ntawm 0.1 degrees.
Cov lus ' ntsis ' thiab ' lo lus ' yog siv los piav txog qhov kev daws teeb meem ntawm multimeter. Lawv tuaj yeem muab faib ua pawg los ntawm cov lus lossis tus lej tso tawm ntawm lub tshuab digital multimeter.
Ib daim ntawm 3 ½ Cov digital multimeter tuaj yeem tso saib peb tus lej tag nrho (0 rau 9) thiab ib "ib nrab tus lej" (tsuas yog ib qho "1" tso tawm lossis sab laug). Ib daim ntawm 3 ½ Cov zaub daws teeb meem ntawm digital multimeter yog siab, uas yog 1999 lo lus. Ib daim ntawm 4 ½ Cov zaub daws teeb meem ntawm digital multimeter yog siab li 19999 lo lus. Piv rau "ntsis", siv "tus cwj pwm" tuaj yeem piav qhia qhov tseeb ntawm multimeter. Tam sim no 3 ½ Qhov kev daws teeb meem ntawm digital multimeter yuav siab li 3200, 4000, lossis 6000 lo lus.
Rau qee qhov kev ntsuas, 3200 lo lus multimeter tuaj yeem muab kev daws teeb meem zoo dua. Piv txwv li, yog tias koj xav ntsuas qhov voltage ntawm 200V lossis siab dua, 1999 lo lus multimeter tsis tuaj yeem ntsuas 0.1V. Ib lub 32 lab meter tuaj yeem tso saib txog 0.1V thaum ntsuas qhov hluav taws xob mus txog 320V. Ua ntej tshaj qhov hluav taws xob ntawm 320V, qhov kev daws teeb meem no zoo ib yam li ntawm qhov kim dua 20000 lo lus multimeter.
2. Qhov tseeb
Qhov tseeb yog qhov ua yuam kev siab tshaj plaws uas tau tsim nyob rau hauv kev ua haujlwm tshwj xeeb. Hauv lwm lo lus, qhov tseeb sawv cev rau qhov sib ze ntawm qhov ntsuas tus nqi tso tawm ntawm digital multimeter thiab tus nqi tiag tiag ntawm cov teeb liab ntsuas.
Qhov tseeb ntawm digital multimeter feem ntau yog qhia raws li feem pua ntawm kev nyeem ntawv. Qhov tseeb ntawm 1 feem pua ntawm kev nyeem ntawv qhia tias yog qhov kev nyeem ntawv pom yog 100V, tus nqi hluav taws xob tiag tiag yuav yog tus nqi ntawm 99V thiab 101V.
Cov kev tsis muaj peev xwm kuj tseem suav nrog ntau yam khoom ntxiv rau qhov tseeb qhov tseeb. Cov kab no sawv cev rau tus lej ntawm cov lus uas yuav txawv ntawm tus lej zoo tshaj plaws ntawm tus nqi tso tawm. Ua li no, qhov tseeb hauv qhov piv txwv saum toj no tuaj yeem qhia tau tias "± (1% ntxiv rau 2)". Yog li, yog tias qhov kev nyeem ntawv tso tawm yog 100V, tus nqi hluav taws xob tiag tiag yuav nyob nruab nrab ntawm 98.8V thiab 101.2V.
Qhov tsis sib xws ntawm analog multimeter yog txiav txim siab los ntawm qhov ua yuam kev tag nrho, tsis yog qhov feem pua ntawm cov ntawv nyeem. Qhov raug raug ntawm ib qho analog multimeter yog ± 2 feem pua lossis ± 3 feem pua ntawm tag nrho cov nplai. Ntawm 1/10 qhov ntsuas tag nrho, qhov tseeb dhau los ua 20 feem pua lossis 30 feem pua ntawm kev nyeem ntawv. Qhov tseeb qhov tseeb ntawm digital multimeter yog raws li kev nyeem ntawv ntawm ± (0.7 feem pua ntxiv 1) thiab ± (0.1 feem pua ntxiv 1) lossis zoo dua.
3. Ohm txoj cai
Qhov voltage, tam sim no, thiab tsis kam ntawm ib qho hluav taws xob tuaj yeem suav nrog Ohm txoj cai, uas tau hais tias "voltage sib npaug ntawm cov khoom tam sim no thiab tsis kam" (saib daim duab 1). Yog li ntawd, yog tias muaj ob qhov tseem ceeb hauv cov qauv paub, tus nqi thib peb tuaj yeem txiav txim siab.
Lub tshuab hluav taws xob digital siv Ohm txoj cai los ntsuas ncaj qha thiab tso saib tsis kam, tam sim no, lossis voltage. Cov hauv qab no piav qhia yuav ua li cas siv digital multimeter kom yooj yim ntsuas qhov yuav tsum tau ua.
4. Cov duab digital thiab analog
Cov zaub digital muaj qhov tseeb thiab kev daws teeb meem, thiab tuaj yeem tso tawm peb lossis ntau tus lej rau txhua qhov ntsuas tus nqi.
Qhov tseeb ntawm analog pointer zaub tsis yog siab heev, thiab qhov kev daws teeb meem zoo kuj tseem tsawg, vim tias nws yuav tsum kwv yees tus nqi ntawm ob lub cim kos.
Cov kab kos duab tuaj yeem pom cov teeb liab hloov pauv thiab cov qauv zoo li analog pointers, tab sis lawv muaj zog dua thiab tsis tshua muaj kev puas tsuaj piv rau cov pointers.
