Lub hauv paus ntsiab lus ntawm cov digital multimeter yog hloov zuj zus los ntawm txoj cai analog, uas yog
1) Tom qab faib qhov ntsuas hluav taws xob los ntawm qhov hluav taws xob faib hluav taws xob, nws tau hloov mus rau hauv qhov ntsuas tam sim no rau lub ntsuas hluav taws xob los ntawm kev ua haujlwm analog amplifier, thiab tom qab ntawd nkag mus rau hauv A / D converter los hloov nws mus rau hauv cov teeb liab digital los ua tus nqi tiag. .
2) Tom qab ntsuas tam sim no shunted los ntawm shunt resistor, nws tau hloov mus rau hauv ib qho kev faib ua feem rau qhov ntsuas los ntawm kev ua haujlwm analog amplifier, thiab tom qab ntawd nkag mus rau A / D converter, hloov mus rau hauv cov teeb liab digital, thiab tso tawm. raws li tus nqi tiag tiag los ntawm cov zaub.
3) Kev ntsuas hluav taws xob yog faib cov ntsuas hluav taws xob los ntawm kev tiv thaiv, thiab tom qab ntawd hloov nws mus rau hauv qhov tam sim no nrog qee qhov kev faib ua feem rau lub ntsuas los ntawm kev ua haujlwm analog amplifier, thiab tom qab ntawd nkag mus rau A / D converter, hloov mus rau hauv cov teeb liab digital. , thiab tso saib nws raws li tus nqi tiag tiag los ntawm cov zaub. .
Feem ntau faults thiab txij nkawm ntawm digital multimeter
1) Tsis muaj zaub ntawm lub ntsuas ntsuas Ua ntej, xyuas seb lub roj teeb hluav taws xob puas zoo li qub (feem ntau yog siv 9V roj teeb, thiab cov tshiab yuav tsum ntsuas). Qhov 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 seb lub rooj tsav xwm Circuit Court puas corroded los yog luv luv Circuit Court los yog luv luv Circuit Court (tshwj xeeb tshaj yog lub ntsiab fais fab Circuit Court). Yog tias muaj, lub rooj tsav xwm Circuit Court yuav tsum tau muab ntxuav, thiab kev ziab thiab vuam yuav tsum ua tiav raws sijhawm; Puas yog qhov ntsuas hluav taws xob zoo li qub rau ob tus pins ntawm lub zog nkag? Yog tias qhov ntsuas hluav taws xob zoo li qub, qhov kev 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 ua raws sijhawm; yog tias tsis yog nws tsis zoo li qub tom qab raug cuam tshuam nrog, ces qhov kev sib xyaw ua ke tau luv luv thiab yuav tsum tau hloov.
2) Cov iav tiv thaiv tsis tuaj yeem ntsuas. Ua ntej, kos lub rooj tsav xwm Circuit Court los ntawm qhov pom. Puas muaj ib qho kev sib txuas ntawm cov resistor nyob rau hauv lub voj voog tiv thaiv uas tau hlawv tawm? Yog tias muaj, nws yuav tsum tau hloov tam sim ntawd; yog tias tsis yog, txhua qhov txuas yuav tsum tau ntsuas, thiab cov khoom puas yuav tsum tau hloov raws 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) Tus nqi tso tawm ntawm lub zog hluav taws xob yog qhov tsis raug thaum ntsuas qhov hluav taws xob siab, lossis tus nqi tso tawm 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 hais tias, nyob rau hauv ob peb lub vib nas this ntawm kev tso tseg qhov ntsuas, qee cov khoom tau pom tias kub thaum lub sij hawm soj ntsuam, uas yog tshwm sim los ntawm thermal los ntawm lub hwj chim tsis txaus, cov khoom (los yog integrated circuit) yuav tsum tau hloov.
4) Cov ntaub ntawv 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. Xyuas seb tam sim no limiting resistor thiab shunt resistor puas raug hlawv? Yog tias nws kub hnyiab, nws yuav tsum tau hloov; tom qab ntawd xyuas seb qhov kev sib txuas xaim rau 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 tso tawm tsis ruaj khov thiab muaj lo lus dhia tshwm sim. Xyuas seb tag nrho lub rooj tsav xwm hauv Circuit Court puas ntub lossis muaj qhov tshwm sim los? Yog tias muaj, lub rooj tsav xwm Circuit Court yuav tsum tau ntxuav thiab qhuav; seb puas muaj kev sib cuag tsis zoo los yog cov khoom siv hluav taws xob hauv cov khoom siv hluav taws xob (xws li tus cwj mem xeem), yog tias muaj, nws yuav tsum tau rov ua dua; xyuas seb puas muaj kev tiv thaiv tsis zoo lossis puas muaj cov khoom siv tom qab kuaj Supernormal kub tes tshwm sim tshwm sim, qhov tshwm sim no tshwm sim los ntawm nws lub zog txo, yog tias qhov tshwm sim no tshwm sim, cov khoom yuav tsum tau hloov.
6) Tus nqi tso tawm yog qhov tsis raug Qhov tshwm sim no feem ntau yog tshwm sim los ntawm qhov tsis ua hauj lwm los yog capacitor nyob rau hauv kev ntsuas Circuit Court, thiab lub capacitor 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 teb), yog hais tias tus nqi kuj hloov los yog thermal teb tus nqi, lub resistor yuav tsum tau hloov; xyuas qhov tsis kam ntawm cov resistor nyob rau hauv qhov siv voltage voj ntawm A / D converter Puas yog tus nqi, capacitor puas? Yog tias puas lawm, hloov nws.
Lub hauv paus ntsiab lus ntawm kev kho cov txheej txheem ntawm digital multimeter yog "Nrhiav qhov yuam kev yuav tsum tau ua ntej ntawm sab nraud ua ntej sab hauv, los ntawm qhov yooj yim mus rau qhov nyuaj, tawg mus rau hauv qhov chaw, thiab ua qhov tseem ceeb breakthroughs." Cov txheej txheem tuaj yeem kwv yees faib ua pawg hauv qab no:
⒈ Kev soj ntsuam txoj kev: Los ntawm tib neeg lub zeem muag, hnov, hnov tsw, thiab kov kom pom thiab nrhiav qhov chaw txhaum. Los ntawm kev soj ntsuam pom, nws tuaj yeem pom xws li kev sib txuas, desoldering, luv-circuiting, tawg fuse tube, burnt tivthaiv, mechanical puas tsuaj, deformation ntawm luam Circuit Court board thiab lifting thiab tawg ntawm tooj liab ntawv ci rau nws; koj tuaj yeem kov lub roj teeb, Rau qhov kub siab ntawm cov resistors, transistors thiab kev sib xyaw ua ke, koj tuaj yeem xa mus rau daim duab kos duab kom paub seb yog vim li cas qhov kub thiab txias nce raws li lub hauv paus ntsiab lus ntawm Circuit Court. Tsis tas li ntawd, koj tuaj yeem tshawb xyuas los ntawm txhais tes seb cov khoom siv hluav taws xob puas xoob, seb cov pins ntawm lub voj voog sib txuas tau ruaj khov, thiab seb qhov hloov pauv puas tau daig; koj tuaj yeem hnov thiab hnov txog seb puas muaj lub suab txawv txav, tsw ntxhiab, thiab lwm yam.
⒉ Voltage method Ntsuas seb qhov ua haujlwm voltage ntawm txhua lub ntsiab lus tseem ceeb yog qhov qub, thiab qhov yuam kev tuaj yeem pom sai. Xws li ntsuas qhov ua haujlwm voltage ntawm A / D converter, siv voltage, thiab lwm yam.
⒊ Txoj kev luv luv Raws li txoj kev tshawb xyuas A / D converter uas tau hais los saum toj no, feem ntau siv txoj kev luv luv, thiab txoj kev no yog siv ntau dua hauv kev kho cov twj tsis muaj zog thiab micro-hluav taws xob.
⒋ Txoj kev qhib Circuit Court Disconnect qhov tsis txaus ntseeg ntawm tag nrho lub tshuab lossis chav tsev hluav taws xob. Yog hais tias qhov txhaum ploj mus, nws txhais tau hais tias qhov txhaum nyob rau hauv lub disconnected Circuit Court. Txoj kev no feem ntau yog tsim rau luv luv Circuit Court.
⒌ Hloov txoj kev Thaum qhov txhaum raug txo mus rau ib qho chaw lossis ob peb yam, nws tuaj yeem ntsuas hauv online lossis offline. Yog tias tsim nyog, hloov nrog cov khoom zoo. Yog tias qhov txhaum ploj mus, cov khoom tawg.
⒍Signal txhaj method Lub teeb liab soj ntsuam txoj kev tuaj yeem txhim kho qhov tseeb ntawm kev txiav txim siab. Piv txwv li, siv qhov induced voltage ntawm tib neeg lub cev raws li ib tug cuam tshuam lub teeb liab los soj ntsuam qhov kev hloov ntawm cov zaub screen ntawm lub saib yuav tsum tau kho, nws yog feem ntau siv los xyuas seb lub input Circuit Court thiab cov zaub ib feem nyob rau hauv zoo.
