Dab tsi yog qhov tseem ceeb ntawm kev saib xyuas ntawm multimeter zaus muaj nuj nqi?
1. Kho txoj hauv kev: Thaum nrhiav kev ua txhaum, koj yuav tsum xub saib sab nraud thiab tom qab ntawd sab hauv, ua ntej yooj yim thiab tom qab ntawd nyuaj, tawg mus rau hauv qhov chaw, thiab tsom mus rau kev tawg. Cov txheej txheem tuaj yeem kwv yees faib ua pawg hauv qab no:
Txoj kev hnov lus cia siab rau kev nkag siab ncaj qha rau kev txiav txim qhov ua txhaum. Los ntawm kev tshuaj xyuas qhov muag, nws tuaj yeem pom xws li cov xov hlau tawg, desoldering, luv luv Circuit Court, tawg fuse hlab, cov khoom siv hluav taws kub, kev puas tsuaj, lifted tooj liab ntawv ci ntawm cov ntawv luam tawm thiab tawg, thiab lwm yam .; Koj tuaj yeem kov qhov kub thiab txias ntawm cov roj teeb, resistors, transistors, thiab kev sib xyaw ua ke, thiab xa mus rau daim duab kos duab kom paub seb qhov ua rau qhov kub tsis txawv txav. Tsis tas li ntawd, koj tuaj yeem siv koj txhais tes los xyuas seb cov khoom puas yog xoob, seb cov pins sib xyaw ua ke tau ruaj khov, thiab seb qhov hloov pauv puas tau daig; koj tuaj yeem hnov thiab hnov tsw txawm tias muaj cov suab txawv txawv thiab tsw tsw.
Txoj kev ntsuas hluav taws xob: Kev ntsuas seb qhov ua haujlwm voltage ntawm txhua qhov tseem ceeb yog qhov qub tuaj yeem pom qhov ua txhaum sai sai. Xws li ntsuas qhov ua haujlwm voltage thiab siv voltage ntawm A / D converter.
Short-circuit method Txoj kev luv-circuit feem ntau yog siv rau hauv cov kev kuaj xyuas A/D converters uas tau hais los saum no. Txoj kev no feem ntau siv thaum kho cov cuab yeej hluav taws xob tsis muaj zog thiab micro-hluav taws xob.
Txoj kev rhuav tshem: Tshem tawm qhov tsis txaus ntseeg ntawm tag nrho lub tshuab lossis lub tshuab 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 yog qhov tsim nyog rau cov xwm txheej uas muaj luv luv hauv Circuit Court.
Kev ntsuas kev tivthaiv Thaum qhov kev ua txhaum tau nqaim mus rau ib lossis ob peb yam, nws tuaj yeem ntsuas hauv online lossis offline. Yog tias tsim nyog, hloov nws nrog cov khoom zoo. Yog tias qhov txhaum ploj mus, nws txhais tau hais tias cov khoom tsis zoo. 6. Kev cuam tshuam txoj kev: Siv qhov induced voltage ntawm tib neeg lub cev raws li lub teeb liab cuam tshuam los soj ntsuam cov kev hloov hauv cov kua siv lead ua kua. Nws feem ntau yog siv los xyuas seb qhov input Circuit Court thiab cov khoom siv puas zoo lawm.
2. Kho kev txawj ntse Rau ib tug faulty ntsuas, koj yuav tsum xub xyuas thiab txiav txim seb qhov txhaum tshwm sim yog ib qho tshwm sim (tag nrho cov dej num yuav ntsuas tsis tau) los yog tus kheej (ib tug neeg lub luag hauj lwm los yog ib tug ntau yam), thiab ces sib txawv qhov teeb meem thiab daws nws raws li.
Yog tias txhua lub zog tsis ua haujlwm, tsom mus xyuas lub zog hluav taws xob thiab A / D converter circuit. Thaum kuaj xyuas cov khoom siv hluav taws xob, koj tuaj yeem tshem tawm cov roj teeb laminated, nias lub hwj huam hloov, txuas qhov kev ntsuam xyuas zoo ua rau lub hwj chim tsis zoo ntawm lub ntsuas hluav taws xob hauv qab kev sim, thiab txuas cov kev xeem tsis zoo ua rau lub hwj chim zoo (rau digital. multimeter). Tig qhov hloov mus rau qhov ntsuas diode. Yog hais tias nws qhia yog lub pem hauv ntej voltage ntawm lub diode, nws txhais tau hais tias lub hwj chim mov feem yog zoo. Yog tias qhov sib txawv loj, nws txhais tau hais tias muaj teeb meem nrog cov khoom siv hluav taws xob. Yog tias muaj qhov qhib Circuit Court, tsom rau kev kuaj xyuas lub hwj chim hloov thiab cov roj teeb coj. Yog hais tias ib tug luv luv Circuit Court tshwm sim, koj yuav tsum tau siv lub Circuit Court breaking txoj kev maj mam disconnect lub Cheebtsam uas siv lub hwj chim, tsom rau kev soj ntsuam lub lag luam amplifier, timer, A / D converter, thiab lwm yam. Yog hais tias ib tug luv luv Circuit Court tshwm sim, feem ntau muaj ntau tshaj ib tug integrated tivthaiv. yuav puas. Kev kuaj xyuas A / D converter tuaj yeem ua tiav tib lub sijhawm raws li cov ntsuas ntsuas, uas yog sib npaug rau DC meter ntawm analog multimeter.
Kev tshuaj xyuas tshwj xeeb:
(1) Tig qhov ntsuas qhov ntsuas ntawm qhov ntsuas ntsuas mus rau qhov qis tshaj DC voltage ntau;
(2) Ntsuas seb qhov ua haujlwm voltage ntawm A / D converter yog qhov qub. Raws li A / D converter qauv siv nyob rau hauv lub rooj, sib xws rau V + tus pin thiab COM tus pin, seb tus nqi ntsuas yog raws li nws cov nqi raug.
(3) Ntsuas qhov siv hluav taws xob ntawm A / D converter. Kev siv hluav taws xob ntawm cov khoom siv digital multimeter feem ntau yog 100mV lossis 1V, uas yog, ntsuas qhov DC voltage ntawm VREF + thiab COM. Yog hais tias nws deviates ntawm 100mV los yog 1V, siv lub potentiometer sab nraud. Ua kev hloov kho.
(4) Txheeb xyuas tus lej xov tooj uas qhov kev tawm tswv yim yog xoom, luv-circuit qhov zoo davhlau ya nyob twg IN + thiab qhov tsis zoo davhlau ya nyob twg IN- ntawm A / D converter, kom cov input voltage Vin=0, lub meter qhia "{ {5}} 0 los yog "00.00.
(5) Tshawb xyuas cov zaub kom pom qhov ci ntsa iab. Short-circuit lub xeem davhlau ya nyob twg TEST tus pin thiab qhov zoo fais fab mov davhlau ya nyob twg V +, kom lub logic hauv av yuav muaj peev xwm thiab tag nrho cov digital circuits tsis ua hauj lwm. Txij li thaum DC voltage yog siv rau txhua qhov mob stroke, txhua qhov strokes teeb thiab cov ntsuas ntsuas ntsuas "1888." Yog tias muaj cov kab mob uas ploj lawm, xyuas seb puas muaj kev sib cuag tsis zoo lossis kev cuam tshuam ntawm cov khoom sib txuas ntawm tus pin A / D converter, cov nplaum nplaum (lossis kev sib txuas), thiab cov zaub.
