Digital multimeter kho cov lus qhia uas
Lub ntsuas faulty yuav tsum xub xyuas thiab txheeb xyuas qhov tshwm sim txhaum yog ib txwm muaj (txhua lub luag haujlwm tsis tuaj yeem ntsuas), lossis tus kheej (tus kheej lub luag haujlwm lossis tus kheej ntau yam), thiab tom qab ntawd sib txawv ntawm qhov xwm txheej, kev daws teeb meem.
1. Yog tias tag nrho cov iav tsis tuaj yeem ua haujlwm, yuav tsum tsom rau kev kuaj xyuas lub zog hluav taws xob thiab A / D converter circuit. Txheeb xyuas qhov chaw fais fab, koj tuaj yeem tshem tawm cov roj teeb laminated, nias lub hwj huam hloov, nrog tus cwj mem zoo txuas nrog lub rooj ntsuas hluav taws xob tsis zoo, tus cwj mem tsis zoo txuas nrog lub hwj chim mov zoo (rau digital multimeter), qhov hloov tau raug ntaus. mus rau cov ntaub ntawv ntsuas ob lub raj, yog tias cov zaub yog lub raj thib ob qhov zoo voltage, nws txhais tau hais tias lub hwj huam mov ib feem ntawm qhov zoo, yog tias qhov sib txawv loj, ces nws txhais tau hais tias lub hwj huam mov ib feem ntawm qhov teeb meem. Yog tias muaj qhov qhib Circuit Court, tsom mus rau kev tshuaj xyuas lub zog hloov pauv thiab cov roj teeb ua haujlwm, thiab lwm yam.. Yog tias muaj kev cuam tshuam luv luv, nws yuav tsum siv txoj kev sib txuas kom maj mam disconnect cov khoom siv hluav taws xob, tsom mus rau kev kuaj xyuas kev ua haujlwm. amplifier, timer thiab A/D converter, thiab lwm yam.. Yog hais tias ib tug luv luv Circuit Court tshwm sim, nws feem ntau puas ntau tshaj ib tug integrated tivthaiv. Kos lub A / D converter tuaj yeem ua tiav tib lub sijhawm raws li cov lus yooj yim, sib npaug rau DC lub taub hau ntawm analogue multimeter, cov kev kuaj tshwj xeeb:
(1) Qhov ntau ntawm cov lus ntsuas tau tig mus rau qhov qis tshaj DC voltage iav;.
(2) Ntsuas seb qhov A / D converter kev khiav hauj lwm voltage yog li cas. Raws li cov lus siv hauv A / D converter qauv, sib haum rau V + ko taw thiab COM taw, qhov ntsuas tus nqi thiab nws cov nqi raug piv rau seb nws zoo ib yam.
(3) Ntsuas qhov siv hluav taws xob siv hluav taws xob ntawm A / D converter, tam sim no feem ntau siv digital multimeter siv hluav taws xob feem ntau yog 100mV lossis 1V, uas yog, ntsuas DC voltage ntawm VREF + thiab COM, yog tias nws txawv ntawm 100mV lossis 1V, nws tuaj yeem yuav tau kho los ntawm ib tug sab nraud potentiometer.
(4) Txheeb xyuas tus naj npawb ntawm cov tswv yim xoom, lub davhlau ya nyob twg zoo ntawm A / D converter IN + thiab lub davhlau ya nyob twg tsis zoo IN - luv luv, kom cov input voltage Vin=0, cov cuab yeej qhia "{{4} }.0 or" 00 00.
(5) Txheeb xyuas qhov ci ci tag nrho ntawm cov teeb pom kev zoo. Lub davhlau ya nyob twg xeem TEST ko taw thiab qhov zoo fais fab mov davhlau ya nyob twg V + luv, kom lub logic hauv av mus rau hauv lub peev xwm siab, tag nrho cov digital circuits nres ua haujlwm. Vim tias txhua tus mob stroke ntxiv rau DC voltage, yog li txhua qhov strokes ci ntsa iab ntawm lub rooj qhia "1888, counterparts ntawm lub rooj qhia" 18888. Yog tias tsis muaj qhov tshwm sim ntawm qhov tshwm sim tsis zoo, xyuas cov khoom siv taw qhia ntawm A / D converter thiab cov nplaum nplaum (los yog kab), thiab cov zaub ntawm seb puas muaj kev sib cuag tsis zoo ntawm cov kab thiab cov ntaub ntawv ntawm kev tawg.
2. Yog hais tias muaj teeb meem nrog ib tug neeg cov ntaub ntawv, lub A / D converter thiab lub hwj chim mov ib feem ntawm cov kev ua hauj lwm ib txwm. DC voltage, tiv thaiv cov ntaub ntawv qhia ib txheej ntawm voltage divider resistors; AC thiab DC tam sim no sib koom ib qho shunt; AC voltage thiab AC tam sim no qhia ib txheej ntawm AC / DC converter; lwm tus, xws li Cx, HFE, F, thiab lwm yam yog tsim los ntawm kev ywj pheej sib txawv converters. Nkag siab txog kev sib raug zoo ntawm lawv, thiab tom qab ntawd raws li daim duab qhia kev siv hluav taws xob, nws yooj yim los nrhiav qhov chaw txhaum. Yog tias qhov ntsuas me me ntawm qhov tsis raug lossis cov duab cov duab dhia loj, ces tsom mus rau kev tshuaj xyuas qhov kev hloov pauv kev sib cuag yog qhov zoo.
3. Yog tias cov ntaub ntawv ntsuas tsis ruaj khov, thiab tus nqi ib txwm nce ntxiv, luv luv cov tswv yim ntawm A / D converter, cov ntaub ntawv tso saib tsis yog xoom, nws feem ntau tshwm sim los ntawm kev ua haujlwm tsis zoo ntawm 0. 1μF siv capacitor. Kuv vam tias nws yuav pab tau koj.
