Common Faults thiab Solutions ntawm Digital Multimeters
Kev yos hav zoov yuam kev yuav tsum ua raws li cov hauv paus ntsiab lus: los ntawm sab nraud mus rau sab hauv, los ntawm qhov yooj yim mus rau qhov nyuaj, faib tag nrho rau hauv qhov chaw, thiab ua kom tawg ntawm cov ntsiab lus tseem ceeb. Cov txheej txheem tseem ceeb tau teev tseg hauv qab no:
① Sensory Inspection Method Txiav txim qhov ua txhaum ncaj qha los ntawm tib neeg lub siab. Kev kuaj pom pom tuaj yeem kuaj xyuas cov xov hlau tawg, cov pob qij txha txias, luv luv los ntawm cov xov hlau sib tshooj, cov tshuab hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv puas tsuaj, tshem tawm lossis tawg cov kab tooj liab ntawm cov ntawv luam tawm, thiab lwm yam. Kov los xyuas qhov kub thiab txias ntawm cov roj teeb, resistors, transistors thiab ICs, thiab nrhiav qhov ua rau ntawm qhov kub thiab txias. Tsis tas li ntawd, manually xyuas seb cov khoom puas yog xoob, seb IC pins tau ruaj khov, thiab seb qhov hloov pauv hloov tau daig. Mloog cov suab txawv txav thiab hnov tsw rau cov ntxhiab tsw txawv txawv.
② Voltage Measurement Method Ceev nrooj nrhiav cov ntsiab lus tsis raug los ntawm kev ntsuas qhov kev khiav hauj lwm voltage ntawm cov nodes tseem ceeb thiab xyuas seb puas muaj nuj nqis
yog li qub. Piv txwv suav nrog ntsuas cov khoom siv hluav taws xob thiab siv hluav taws xob ntawm A / D converter.
③ Short-circuit Method Txoj kev no feem ntau siv nyob rau hauv cov txheej txheem tshuaj xyuas A/D converter yav dhau los, thiab siv dav hauv kev kho cov twj tsis muaj zog-tam sim no thiab microelectronic.
④ Txoj Kev Qhib-Circuit Disconnect qhov xav tias seem ntawm tag nrho cov cuab yeej lossis chav tsev hauv Circuit Court. Yog tias qhov txhaum ploj mus, qhov txhaum nyob hauv qhov kev sib txuas tsis raug. Txoj kev no tsuas yog siv tau rau cov kev txom nyem los ntawm luv luv circuits.
⑤ Kev Ntsuas Cov Txheej Txheem Thaum qhov ua txhaum yog nqaim mus rau ib qho chaw lossis ob peb yam, ua qhov ntsuas hauv Circuit Court lossis off-circuit ntsuas. Yog tias tsim nyog, hloov qhov xav tias yuav tsum muaj qhov zoo. Yog hais tias qhov txhaum ploj mus, cov khoom qub yog qhov tsis zoo.
⑥ Kev cuam tshuam txoj kev Siv tib neeg lub cev induced voltage raws li cov teeb liab cuam tshuam thiab saib cov kev hloov ntawm LCD. Txoj kev no feem ntau yog siv los xyuas seb puas muaj cov khoom siv hluav taws xob thiab cov lus qhia ua haujlwm zoo.
