Taw qhia rau header ntawm lub multimeter
Lub taub hau
Lub taub hau ntawm multimeter yog rhiab heev galvanometer. Lub dial ntawm lub taub hau yog luam tawm nrog ntau yam cim, nplai cov cim thiab qhov tseem ceeb. Lub cim AV-Ω qhia tias ammeter yog multimeter uas tuaj yeem ntsuas tam sim no, voltage thiab tsis kam. Muaj ntau lub nplai kab luam tawm ntawm lub xov tooj, cov uas ib qho cim nrog "Ω" ntawm sab xis yog cov kab tsis sib haum, sab xis kawg yog xoom, sab laug kawg yog ∞, thiab qhov ntsuas tus nqi faib tsis sib npaug. Lub cim "-" lossis "DC" txhais tau hais tias ncaj qha tam sim no, "~" lossis "AC" txhais tau tias hloov pauv tam sim no, thiab "~" txhais tau tias cov kab sib faib los ntawm AC thiab DC. Ob peb kab ntawm tus lej nyob rau hauv kab kab yog qhov ntsuas qhov tseem ceeb sib raug rau cov haujlwm sib txawv ntawm tus xaiv hloov.
Kuj tseem muaj lub tshuab xoom hloov kho pob qhov rooj ntawm lub ntsuas lub taub hau los kho qhov xoom txoj hauj lwm ntawm tus taw tes ntawm sab laug kawg.
Taw qhia txog kev daws teeb meem ntawm digital multimeter
Tus nqi hluav taws xob sib raug rau tus lej kawg ntawm cov digital multimeter ntawm qhov qis tshaj qhov voltage yog hu ua kev daws teeb meem, uas qhia txog qhov rhiab heev ntawm lub 'meter'. Qhov kev daws teeb meem ntawm cov cuab yeej digital nce nrog kev nce ntawm cov lej tso saib. Cov kev daws teeb meem siab tshaj plaws uas digital multimeters nrog cov lej sib txawv tuaj yeem ua tiav yog qhov sib txawv.
Qhov kev daws teeb meem ntawm digital multimeter kuj tuaj yeem pom los ntawm kev daws teeb meem. Kev daws teeb meem yog qhov feem pua ntawm tus lej tsawg tshaj plaws (tsis yog xoom) uas lub ntsuas ntsuas tuaj yeem tso rau tus lej loj tshaj plaws.
Nws yuav tsum tau taw qhia tias qhov kev daws teeb meem thiab qhov tseeb yog ob lub ntsiab lus sib txawv. Tus qub cim qhov "rhiab heev" ntawm qhov ntsuas, uas yog, muaj peev xwm "paub" me me voltages; qhov tom kawg qhia txog qhov "qhov tseeb" ntawm kev ntsuas, uas yog, qib ntawm qhov sib xws ntawm qhov ntsuas qhov tshwm sim thiab tus nqi tseeb. Tsis muaj kev sib txuas tsim nyog ntawm ob, yog li lawv tsis tuaj yeem tsis meej pem, thiab kev daws teeb meem (lossis kev daws teeb meem) yuav tsum tsis txhob yuam kev rau qhov zoo sib xws. Qhov tseeb yog nyob ntawm qhov kev ua yuam kev loj thiab qhov yuam kev quantization ntawm lub internal A/D converter thiab functional converter ntawm lub ntsuas. Los ntawm qhov kev xav ntawm kev ntsuas, kev daws teeb meem yog qhov ntsuas "virtual" (uas tsis muaj dab tsi cuam tshuam nrog kev ntsuas qhov yuam kev), thiab qhov tseeb yog qhov ntsuas "tiag tiag" (nws txiav txim siab qhov loj ntawm kev ntsuas qhov yuam kev). Yog li ntawd, nws yog tsis muaj peev xwm mus arbitrarily nce tus naj npawb ntawm cov zaub cov lej los txhim kho qhov kev daws teeb meem ntawm qhov ntsuas.
