Kev txhim kho keeb kwm ntawm digital multimeter
Digital multimeters tau tsim maj mam dhau los ntawm keeb kwm. Thaum ntxov multimeters siv hlau nplaum los deflect lub pointer dial, uas yog tib yam li classic galvanometer; Cov niaj hnub siv LCD lossis VFD (lub tshuab nqus tsev fluorescent, cov zaub digital muab los ntawm Beijing Jintai Keyi), analog multimeters tsis yooj yim nrhiav hauv khw thib ob, tab sis nws tsis yog qhov tseeb, vim tias ob qho tib si zeroing thiab raug nyeem los ntawm lub ntsuas vaj huam sib luag. muaj kev ncaj ncees. Qee cov analog multimeters siv lub tshuab nqus tsev vacuum los ua kom cov teeb liab tawm tswv yim. Multimeters ntawm qhov tsim no tseem hu ua lub tshuab nqus tsev vacuum voltmeters lossis lub tshuab nqus tsev multimeters. Niaj hnub nimno multimeters yog tag nrho
Ib feem yog digitized thiab tshwj xeeb hu ua digital multimeter. Hauv cov cuab yeej no, cov teeb liab ntsuas tau hloov mus rau hauv cov hluav taws xob digital thiab nthuav dav los ntawm digital preamplifier, thiab tom qab ntawd tus nqi ncaj qha los ntawm cov zaub digital; qhov no zam qhov sib txawv los ntawm parallax thaum nyeem ntawv. Ib yam li ntawd, zoo dua circuitry thiab electronics txhim kho kev ntsuas qhov tseeb. Laus analog meters muaj qhov tseeb ntawm 5 feem pua thiab 10 feem pua, niaj hnub portable digital multimeters tuaj yeem ua tiav ± 0.025 feem pua, thiab cov khoom siv rooj zaum tuaj yeem mus deb li ib feem ntawm ib lab.
