Feem ntau faults thiab txij nkawm ntawm digital multimeter
(1) Tsis muaj cov khoom tso rau ntawm qhov ntsuas Ua ntej, xyuas seb lub roj teeb hluav taws xob puas zoo li qub (9V roj teeb feem ntau siv, thiab cov tshiab yuav tsum ntsuas). Thib ob, xyuas seb lub fuse puas tau tawg, seb qhov ntsuas hluav taws xob puas yog qhov qub, thiab seb qhov kev txwv tam sim no puas qhib. Tom qab ntawd, xyuas lub rooj tsav xwm hauv Circuit Court rau corrosion, luv Circuit Court, los yog qhib Circuit Court (tshwj xeeb tshaj yog lub ntsiab fais fab mov Circuit Court). Yog tias muaj, ntxuav lub rooj tsav xwm hauv Circuit Court, thiab ua haujlwm zoo ntawm kev ziab thiab vuam hauv lub sijhawm; Ob lub pins ntawm lub hwj chim tawm tswv yim, puas yog qhov ntsuas hluav taws xob zoo li qub? Yog tias qhov ntsuas hluav taws xob zoo li qub, qhov sib xyaw ua ke raug puas tsuaj, thiab kev sib xyaw ua ke yuav tsum tau hloov pauv; yog tias qhov ntsuas hluav taws xob tsis zoo, xyuas seb puas muaj lwm cov ntsiab lus luv luv? Yog tias muaj, nws yuav tsum tau hloov lub sijhawm Yog tias nws tsis yog los yog tsis zoo tom qab ua tiav, ces qhov kev sib xyaw ua ke muaj qhov luv luv hauv thiab yuav tsum tau hloov.
(2) Kev ntsuas hluav taws xob tsis tuaj yeem ntsuas. Ua ntej, kos lub rooj tsav xwm Circuit Court los ntawm qhov pom. Puas muaj kev sib txuas resistor hlawv tawm hauv hluav taws xob thaiv hluav taws xob? Yog tias muaj, nws yuav tsum tau hloov tam sim ntawd; yog tias tsis yog, nws yuav tsum ntsuas txhua qhov txuas txuas. Hloov nws lub sijhawm; Yog hais tias lub periphery yog qhov qub, qhov ntsuas kev sib xyaw ua ke raug puas tsuaj thiab yuav tsum tau hloov.
(3) Qhov taw qhia tus nqi ntawm qhov ntsuas hluav taws xob tsis raug thaum ntsuas qhov hluav taws xob siab, lossis qhov ntsuas tus nqi tsis raug lossis txawm tias tsis ruaj khov tom qab ntsuas lub sijhawm ntev. Feem ntau ntawm cov kev ua txhaum no yog tshwm sim los ntawm kev ua haujlwm tsis txaus ntawm ib lossis ob peb yam. Yog tias tsis pub dhau ob peb feeb ntawm kev ntsuas qhov ntsuas, cov khoom no tau pom tias kub thaum kuaj xyuas, uas yog tshwm sim los ntawm thermal cuam tshuam los ntawm lub zog tsis txaus, cov khoom siv (lossis kev sib xyaw ua ke) yuav tsum tau hloov.
(4) Lub thaiv tam sim no tsis tuaj yeem ntsuas. Feem ntau ntawm cov kev ua txhaum no yog tshwm sim los ntawm kev ua haujlwm tsis raug. Koj tuaj yeem tshawb xyuas seb qhov kev txwv tam sim no thiab qhov hluav taws xob faib hluav taws xob puas raug hlawv tawm? Yog tias lawv raug hlawv, lawv yuav tsum tau hloov; ces xyuas seb cov hlau txuas nrog lub amplifier puas puas lawm? Yog tias nws puas lawm, nws yuav tsum tau rov txuas dua; yog tias nws tsis zoo, hloov lub amplifier.
(5) Tus nqi zaub tsis ruaj khov, thiab muaj qhov tshwm sim ntawm cov lus dhia. Tshawb xyuas seb lub rooj tsavxwm tag nrho puas ntub los yog muaj cov dej xau? Yog tias muaj, lub rooj tsav xwm Circuit Court yuav tsum tau ntxuav thiab qhuav; (nrog rau tus cwj mem xeem), yog tias muaj, nws yuav tsum tau rov ua dua; xyuas seb puas muaj kev tiv thaiv tsis zoo los yog seb puas muaj qhov tshwm sim kub txawv txav hauv cov khoom tom qab kuaj. Qhov tshwm sim no tshwm sim los ntawm kev txo qis ntawm nws lub zog. Yog hais tias muaj xws li ib tug tshwm sim, ces lub caij yuav tsum tau hloov.
(6) Qhov qhia tsis tseeb Qhov tshwm sim no feem ntau yog tshwm sim los ntawm qhov tsis ua hauj lwm los yog lub peev xwm nyob rau hauv kev ntsuas Circuit Court, thiab lub capacitance los yog tsis kam yuav tsum tau hloov. Txheeb xyuas tus nqi ntawm cov resistor nyob rau hauv Circuit Court (suav nrog tus nqi kuj nyob rau hauv lub thermal cov tshuaj tiv thaiv), yog hais tias tus nqi kuj hloov los yog thermal teb tus nqi hloov, lub resistor yuav tsum tau hloov; xyuas seb qhov kev tiv thaiv thiab kev muaj peev xwm hauv qhov siv hluav taws xob siv hluav taws xob ntawm A / D converter puas puas? Hloov yog tias puas.
