Keeb kwm ntawm Digital Multimeter Yuav Ua Li Cas Digital Multimeter Ua Haujlwm
Digital multimeters tau hloov zuj zus raws sijhawm. Thaum ntxov multimeters siv lub dial nrog ib tug sib nqus deflection pointer, zoo ib yam li classic ammeter; Cov thev naus laus zis niaj hnub siv cov duab digital los ntawm LCD lossis VFD (Nqus Fluorescent Display). Nws tsis yog qhov nyuaj rau nrhiav analog multimeters hauv khw thib ob, tab sis lawv tsis yog qhov tseeb vim tias ob qho tib si zeroing thiab raug nyeem los ntawm dashboard tuaj yeem yooj yim ua rau deviations.
Digital multimeter keeb kwm
Digital multimeter tau maj mam tsim los ntawm keeb kwm. Thaum ntxov multimeters siv lub dial nrog ib tug sib nqus deflection pointer, zoo ib yam li classic ammeter; Cov thev naus laus zis niaj hnub siv cov duab digital los ntawm LCD lossis VFD (Nqus Fluorescent Display). Nws tsis yog qhov nyuaj rau nrhiav analog multimeters hauv khw thib ob, tab sis lawv tsis yog qhov tseeb vim tias ob qho tib si zeroing thiab raug nyeem los ntawm dashboard tuaj yeem yooj yim ua rau deviations. Qee cov analog multimeters siv lub tshuab nqus tsev vacuum los nthuav tawm cov lus qhia tawm, thiab hom multimeter no tseem hu ua lub tshuab nqus tsev vacuum voltmeter (VTVM) lossis lub tshuab nqus tsev multimeter (VTMM), VacuumTubeMultimeters). Niaj hnub nimno multimeters tau tag nrho digitized thiab tshwj xeeb yog hu ua Digital Multimeters (DMMs), DigitalMultiMeter). Hauv cov cuab yeej no, cov teeb liab ntsuas tau hloov mus rau hauv qhov hluav taws xob digital thiab nthuav dav los ntawm digital preamplifier, thiab tom qab ntawd ncaj qha tso tawm ntawm lub vijtsam digital; Qhov no zam qhov sib txawv los ntawm parallax thaum nyeem ntawv. Ib yam li ntawd, cov tshuab hluav taws xob zoo dua thiab cov khoom siv hluav taws xob kuj tau txhim kho kev ntsuas qhov tseeb. Qhov tseeb qhov tseeb ntawm cov cuab yeej analog qub yog nyob nruab nrab ntawm 5% thiab 10%, thaum niaj hnub portable digital multimeters tuaj yeem ua tiav ± 0.025%, thiab cov cuab yeej ua haujlwm muaj qhov tseeb txog li ib lab.
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm digital multimeter
Lub hauv paus Circuit Court ntawm ib tug multimeter yog ib tug header Circuit Court, uas quantifies lub input DC voltage (analog) thiab outputs nws; Lwm cov haujlwm feem ntau xav tau qhov sib ntxiv ntawm sab nraud circuits. Niaj hnub no, kev koom ua ke ntawm multimeter chips yog nce, thiab tus naj npawb ntawm peripheral circuits yog tsawg. Qhov no muaj ob qho zoo thiab qhov tsis zoo. Qhov zoo: Kev sib koom ua ke siab, yooj yim sab nraud circuits, thiab tsawg dua qhov tsis zoo los ntawm cov teeb meem zoo; Disadvantage: Thaum lub nti tawg, tus nqi hloov pauv siab thiab teeb meem. Qee zaum, cov nyiaj siv los hloov ib lub nti tuaj yeem siv los yuav lwm lub cuab yeej, yog li feem ntau nws yuav tsum tau muab pov tseg.
