1. Txhaum yam ntxwv thiab cov txij nkawm ntawm capacitance uas muaj kev tswj Circuit Court board
Cov ua hauj lwm ntawm capacitance kev puas tsuaj yog lub siab tshaj plaws nyob rau hauv hluav taws xob pab kiag li lawm, tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv ntawm electrolytic capacitance.
Lub capacitance tsis ua hauj lwm yog qhia raws li nram no: 1. muaj peev xwm yog me me; 2. Tag nrho cov tsis muaj peev xwm; 3. Lub to; 4. Ib tug luv luv Circuit Court.
Capacitors ua si ib tug txawv lub luag hauj lwm nyob rau hauv lub Circuit Court, thiab cov failures kuj characterized.In lub industrial tswj luam Circuit Court board, Cov Circuit Court board yog cov feem ntau, tus capacitor yog siv los ua lub hwj chim lim, lub teeb liab coupling thiab cov capacitance ntawm lub oscillator Circuit Court yog less.If lub electrolytic capacitor siv nyob rau hauv lub switching fais fab mov yog puas ntsoog, cov switching fais fab mov yuav tsis tau vibrating, thiab yog tsis muaj voltage output.Or tso zis voltage filtering yog tsis zoo, rau hauv circuit Court vim voltage instability thiab cov zajlus kom tsis meej pem, qhov kev kawm ntawm lub tshuab ua hauj lwm teev los yog tsis tau qhib tau lub tshuab, yog hais tias tus capacitor thiab cov circuit Court Rooj Tswjhwm Saib cov fais fab mov ntawm lub zoo thiab tsis zoo, qhov kev kawm ntawm cov above.This yog tshwj xeeb yog muaj zog nyob ze ntawm lub computer motherboard, ntau computer siv zoo nkaus li tej zaum yuav tsis qhib lub tshuab rau ntau xyoo, lub phenomenon ntawm tej zaum puv, qhib cov ntaub ntawv, feem ntau muaj electrolytic capacitor dhia phenomenon yuav pom, yog hais tias tus capacitor down los ntsuas muaj peev xwm mus nrhiav tau yog tsawg tshaj qhov tseeb tus nqi.
Lub neej ntawm capacitor yog ncaj qha txog ambient kub. Lub siab dua cov ib puag ncig kub, lub luv luv lub capacitor life.This kav tsis tau tsuas yog siv tau rau electrolytic capacitors tab sis kuj mus rau lwm cov capacitors.Therefore, nyob rau hauv cov kev tshawb fawb rau cov tsis ua hauj lwm capacitance, nws yog tsim nyog los saib lub capacitance uas yog tus nyob ze rau lub tshav kub qhov twg los, xws li cov capacitance los ntawm cov sab ntawm lub radiator thiab cov muaj hwj huam tuaj txoos ua ke yam. Cov los ze zog mus rau nws, qhov ntau dua nws yog yuav tsum tau damaged.Have tau kho ib tug X-ray khuam ntes fais fab mov, cov neeg siv kev cuam tshuam cov pa luam yeeb tuaj tawm los ntawm lub hwj huam mov, qhib rooj plaub tom qab cov sij hawm tuaj ib tug 1000 uf / 350 v loj capacitor muaj cov oily khoom tawm, rhuav qhib tuaj mus ua ib tug muaj peev xwm ntawm xwb ib ob peb kaum ntawm uf, kuj pom tias tsuas yog tus capacitance ntawm lub rectifier choj thiab tshav kub tog uas nyob ze, lwm yam los ntawm deb yog lawm, lub peev xwm yog normal.In tas li ntawd, muaj yog ib tug luv luv circuit Court nyob rau hauv lub capacitance ntawm Tuam Tshoj nti, thiab nws kuj pom tias cov capacitor yog nyob ze rau cov cua kub parts.Therefore, nws yuav tsum tau teem thaum searching rau txij nkawm.
Ib txhia capacitive to yog heev loj heev, nrog ntiv tes mus kov tau txawm kub, qhov no zoo ntawm capacitor yuav tau hloov.
Nyob rau hauv cov ntaub ntawv ntawm kev zoo thiab kev phem breakdowns, feem ntau txhaum yog cov tsis ua hauj ntawm capacitance damage.So nyob rau hauv xws tsis ua hauj lwm, capacitance yuav ua tau qhov tseem ceeb rau xyuas, tom qab cov kev hloov ntawm capacitance yog feem ntau tsab (ntawm cov hoob kawm kuj yuav tsum tau them nyiaj mloog mus rau qhov zoo ntawm lub capacitance, xaiv zoo dua hom, xws li ruby, dub pob zeb diamond thiab cov zoo li).
2. Cov yam ntxwv thiab kev ntxub ntxaug kuj puas tsuaj
Resistors yog cov feem ntau heev heev Cheebtsam nyob rau hauv hluav taws xob cov khoom, tab sis tsis yog lub feem ntau puas components.Resistance kev puas tsuaj yog lub feem ntau txoj kev uas yuav qhib txoj kev, thiab cov kuj yog tsawg tsawg thiab cov kuj yog heev rare.Common carbon zaj duab xis kuj, hlau zaj duab xis kuj, hlau mob kuj thiab kev kho mob resistance.The feem ntau lug ua ntej ob hom ntawm kuj, tus yam ntxwv ntawm nws cov kev puas tsuaj yog ib tug tsis tshua muaj kuj (hauv qab no 100 Ω) thiab tus nqi uas siab (ntau tshaj 100 k Ω) puas tus nqi yog siab dua, intermediate kuj (xws li ib ob peb puas rau kaum ntawm txhiab ntawm European) me ntsis kev puas tsuaj; qhov thib ob yog hais tias lub kuj tsawg kuj yog feem ntau raug hluav taws chwv thiab dub, thiab nws yog ib qho yooj yim mus nrhiav tau hais tias muaj ob peb lub cim thaum tus kuj muaj siab kuj yog damaged.Wire txhab kuj yog feem ntau siv raws li ib tug loj tam sim no txwv txaus, thiab cov kuj yog tsis large.Some ntawm lub cylindrical nyob ntawm tej yuav blackened los yog nto blasting, tej kab nrib pleb los yog tsis muaj marks.Cement kuj yog ib yam ntawm cov hlau wou nd kuj, uas tej zaum yuav lov thaum burnt, txwv tsis pub muaj yog tsis pom trace.When lub tuav pov hwm kuj Burns, ib co chaw yuav tshuab ib tug daim ntawm daim tawv nqaij, ib co kev uas twb tsis muaj qhov cim tseg, tab sis nws yuav tsis muaj blackened.According mus rau saum toj yam ntxwv, thaum xyuas cov kuj, yuav tau teem rau, sai sai txheeb xyuas cov puas kuj.
Raws li tus yam ntxwv ntawm lub npe saum toj no, peb muaj peev xwm ua ntej saib cov uas tsis muaj kuj tseem ceeb rau tej yam cim qhia ntawm blackened rau luam Circuit Court laug cam , thiab ces raws li cov kev puas tsuaj rau feem coob ntawm cov qhib los yog tus nqi ua loj thiab yooj yim rau kev puas tus yam ntxwv siab kuj tseem ceeb, peb yuav siv cov multimeter direct volume heev resistances nyob rau hauv lub PCB circuit Court laug cam ntawm ob xaus ntawm lub kuj muaj cov kuj, yog hais tias tus nqi ntawm kuj yog ntau tshaj nominal tus nqi, yog cov kuj yuav tsum yuav puas ntsoog (tau them nyiaj mloog rau, xws li ruaj khov kuj tsom tsuas yog tom qab rau cov lus xaus, vim hais tias tej zaum yuav shunt capacitance nyob rau hauv circuit Court Cheebtsam, muaj yog ib tug xwb thiab mus txoj kev), yog hais tias tus nqi ntawm kuj yog me dua nominal tus nqi, koj feem ntau tsis muaj yuav las mees nws. qhov ntawd yog yuav ua li cas koj ntsuas txhua txhua resistor nyob cov ntawv luam circuit Court board PCB, txawm yog hais tias tus "tsis yog" ib txhiab, nws yuav tsis cia ib tug.
3.the ntsuam xyuas txoj kev ua hauj lwm amplifier
Ua hauj lwm zoo amplifier ntawm discriminant rau ib tug heev ob peb hluav taws xob txij nkawm muaj tej yam teeb meem, tsis tsuas cov neeg kawm ntawv cov kev cai cov kev sib raug zoo, vam tias nws yuav pab nrog koj tham txog qhov no nrog koj.
Qhov zoo tshaj plaws ua hauj lwm amplifier muaj cov yam ntxwv ntawm "virtual luv luv" thiab "virtual so". Cov ob yam ntxwv yog heev pab tau rau Ntsuam xyuas cov thauj Circuit Court ntawm linear application.In thiaj li yuav xyuas kom meej linear daim ntawv thov, thauj yuav tsum ua hauj lwm nyob rau hauv lub voj kaw (tsis zoo tswv yim) .Yog hais tias muaj yog tsis muaj tsis zoo tswv yim, lub qhib voj amplification yog ib tug comparator.If lub ntaus ntawv yog yuav tsum tau txiav txim, nws yuav tsum muaj tseeb seb tus ntaus ntawv yog siv raws li ib tug amplifier los yog raws li ib tug comparator nyob rau hauv lub circuit Court.
Tsis muaj teeb meem dab tsi hom ntawm amplifier, muaj yog ib tug tswv yim resistor RF, ces thaum peb kho mob thiaj kuaj tau lub tswv yim kuj nyob rau hauv txoj kev los ntawm hluav taws xob, siv ib tug multimeter mus xyuas tso zis thiab rov qab lub tswv yim, cov kuj ntawm lub yog hais tias loj, xws li ntau tshaj ib tug ob peb M Ω, ces peb yuav tau nco ntsoov tus ntaus ntawv yog zaum ua ntxiv rau, yog hais tias tus nqi 0 Ω rau dozens ntawm me me k Ω, yog mus xyuas seb cov kuj ntawm cov zis thiab rov qab lub tswv yim, amplifier siv cov lus yuav ua li cas.
Raws li lub hauv paus ntsiab ntawm virtual amplifier luv luv, uas yog hais tias, yog hais tias tus ua hauj lwm zoo amplifier ua hauj lwm kom zoo, tib cov tswv yim thiab rov qab voltage ntawm lub tswv yim yuav sib npaug, txawm tias muaj cov sib txawv kuj mv theem, ntawm chav kawm, nyob rau hauv ib co ntawm cov siab cov tswv yim impedance circuit Court multimeters kuj yuav ua tau ib tug me ntsis cawv rau voltage xeem, tab sis feem ntau tsis ntau tshaj li 0.2 V, yog qhov txawv ntawm ntau tshaj 0.5 V, lub amplifier yuav tsis muaj tsis ntseeg phem!
Yog hais tias tus ntaus ntawv yog siv raws li ib tug comparer, nws tso cai rau cov tib yuav txawv los ntawm lub tswv yim davhlau ya nyob twg thiab qhov rov qab tswv yim davhlau ya nyob twg. Lub voltage ntawm tib voltage yog opposite rau>, thiab cov qhov tso zis voltage yog nyob ze rau qhov nqi siab tshaj plaws ntawm lub positive.The tib voltage yog qhov rov qab voltage, thiab cov qhov tso zis voltage yog nyob ze rau 0V los yog tsis zoo siab tshaj plaws (nyob ntawm seb dual lub hwj chim los ib lub hwj huam) .Yog hais tias cov nrhiav kom tau voltage tsis tau raws li txoj cai no, ces tus ntaus ntawv yuav yuav puas ntsoog! yog li ntawd koj tsis tas yuav siv cov hloov txoj kev, koj tsis tas yuav rhuav lub nti rau cov luam Circuit Court boardrau kws txiav txim plaub qhov kev kawm ntawm cov amplifier.
4. Ib tug me me ua kom yuam kev los ntsuam xyuas SMT Cheebtsam nyob rau hauv ib multimeter
Ib txhia thaj caij yog heev me me, siv tib yam multimeter cwjmem thiab kuaj txij nkawm yog tsis yooj yim heev, nws yuav ua rau ib tug luv luv Circuit Court, lub thib ob yog rau coated nrog rwb thaiv tsev coating ntawm pin board txaav tuaj mus rau hauv kev sib cuag nrog cov tivthaiv ntawm cov hlau qhov chaw. ntawm no yog ib tug yooj yim txoj kev los muab rau koj ib tug ntau ntawm cov kab ntsab.
Siv ob daim ntawm qhov tsawg kawg nkaus naj npawb ntawm cov koob, muaj txij nkawm technology (tob) nrog multimeter rau kaw ntom nti, thiab ces noj ib tug ntau zoo li tooj liab hlau nyob rau hauv lub cable, nrog ib tug nplua tooj liab hlau cwjmem thiab koob thiab khi ua ke, reoccupy solder weld.With tej me ntsis cwjmem thiab ntsuas lub SMT assembling Cheebtsam thaum tsis muaj luv luv circuit Court board, thiab muaj peev xwm pinpoint prick rwb thaiv tsev coating, noj tus yuam sij rau txoj hauj lwm, tsis muaj yuav mus thab mus txhuam daim nyias nyias nyias nyias.
5. Kho txoj kev Circuit Court board public hwj chim luv luv
Sau Circuit Court board txij nkawm, yog tias koj raug luv luv-Circuit Court txhaum ntawm pej xeem fais fab mov yog feem ntau thawj loj, vim hais tias muaj ntau yam pab kiag li lawm yog sib koom tib lub hwj chim mov, txhua ntaus ntawv nyob rau hauv lub switching fais fab mov, muaj yog lub sijhawm twg los ntawm luv luv Circuit Court, yog hais tias tus phaj caij yog tsis ntau, txais yuav txoj kev ntawm "rab hlau lub ntiaj teb" yuav luv luv-circuit Court point nrhiav tau, yog tias muaj ntau heev smt Cheebtsam, yuav "rab hlau lub ntiaj teb" hlau rau qhov teeb meem no yuav nyob ntawm seb luck.In no pom zoo ib tug zoo tshaj txoj kev, siv cov qauv no, ob zaug lub chaw ua hauj lwm, feem ntau yuav nrhiav tau sai sai lub taw tes rau ntawm tsis ua hauj lwm.
Yuav kom muaj ib tug voltage tam sim no tag nrho adjustable fais fab mov, voltage 0-30v, tam sim no 0-3a, lub hwj chim no mov yog tsis kim, 300RMB los yog so.Will qhib Circuit Court voltage rau tus ntaus ntawv fais fab mov voltage theem, tam sim no rau yam tsawg kawg nkaus ua ntej, ntxiv voltage nyob rau hauv lub circuit Court ntawm lub hwj huam mov voltage 5 v ntsiab lus xws li lub 74 series chips, thiab 0 v sab, nyob ntawm seb cov neeg kawm ntawv ntawm luv luv circuit Court, tam sim no nce maj mam, nrog cov tes mus kov ntaus ntawv, thaum kov ib tug tej yam ntaus ntawv cua sov obviously, qhov no yog feem ntau puas smd Cheebtsam, yuav raug tshem tawm mus ntxiv kom paub tseeb lub measurement.Of cov hoob kawm, tus voltage yuav tsum tsis txhob ntau tshaj cov ua hauj lwm voltage ntawm tus dais, thiab yuav tsis tau kev cob cog rua rau lub txee, txwv tsis pub nws yuav hlawv lwm yam zoo li.
6.a me me lwv, daws tau teeb meem loj
Ntau thiab ntau siv nyob rau hauv industrial tswj luam Circuit Court laug cam PCB , muaj ntau txoj kev ntawm lub rooj tsavxwm nrog kub ntiv tes yog tso rau hauv lub slot. Vim hais tias ntawm qhov phem muaj ib puag ncig, plua tshauv, humidity, corrosive roj puag ncig ua pluag hu tsis ua hauj lwm yog ib qho yooj yim los mus ua kom cov card, ib tug ntau ntawm cov phooj ywg tej zaum yuav txoj kev los daws qhov teeb meem los ntawm kev hloov lub interface card, tab sis tus nqi ntawm yuav daim card yog heev loj, tshwj xeeb tshaj yog ntawm ib co ntawm cov mas cov khoom ntawm lub card.In qhov tseeb, koj yuav zoo li siv ib tug lub lwv mus so ib ob peb lub sij hawm nyob rau hauv lub kub ntiv tes, tu cov av nyob rau hauv lub kub ntiv tes, ces rov sim dua, tej zaum yuav daws tau qhov teeb meem! cov kev yog yooj yim thiab tswv yim.
7.The tsom xam ntawm phem hluav taws xob yuam kev nyob rau hauv zoo lub sij hawm
Tag nrho cov hom ntawm cov zoo lub sij hawm thiab phem hluav taws xob failures yuav muaj xws li cov nram qab no:
1. Tsis hu
Phem kev sib cuag nrog qhov, nrog tawg ntawm cable, phem hu ntawm hlau plug thiab davhlau ya nyob twg, thiab virtual vuam ntawm Cheebtsam, thiab lwm yam
2. Lub teeb liab twb ntxhov
Rau cov circuits, nyob rau hauv cov ntaub ntawv ntawm tej yam tej yam kev mob, tus txhaum yog tam sim no, tej zaum yuav yeej ntau npaum li cas cuam tshuam rau kev tswj system ua rau nws tsis ncaj ncees lawm, kuj muaj ib tug Circuit Court board tivthaiv tsis los yog ib tug neeg zuag qhia tag nrho kev kawm tsis tau hloov, lub anti-cuam muaj peev xwm mus rau ib tug tipping point, yog li ib tug tsis ua hauj lwm;
3. Cov thermal stability ntawm Cheebtsam yog tsis zoo
ntawm ib tug loj tus naj npawb ntawm cov txij nkawm coj, lub cua sov ruaj ntseg ntawm cov thawj electrolytic capacitor yog tsis zoo, ua raws li los ntawm lwm yam capacitors, triode, diodes, IC, kuj, thiab lwm yam
4. Muaj dej thiab hmoov av nyob rau hauv lub Circuit Court board
Ya thiab hmoov av yuav ua hluav taws xob, nrog tsis kam ua hauj lwm, tab sis kuj nyob rau hauv tus txheej txheem ntawm tshav kub bilges txias ntsws kuj yuav tau hloov, cov nyhuv ntawm kuj ua ke nrog rau lwm cov ntsiab muaj nyob rau hauv parallel, cov nyhuv yog muaj zog thaum yuav tau hloov lub circuit Court tsis, ua tsis ua hauj lwm;
5.Software kuj yog ib tug zoo tshaj
Muaj ntau tsis siv nyob rau hauv lub Circuit Court yuav tau kho cov software, cov nyiaj ntawm ib co tsis nyob rau heev tsawg, nyob rau hauv lub tseem ceeb heev ntau yam, thaum lub tshuab kev lag luam raws li software txhaum yog vim li cas, ces lub tswb yuav tshwm sim.
8. Yuav ua li cas mus nrhiav tau sai sai lub Cheebtsam ntaub ntawv?
Niaj hnub nimno electronics yog multifarious, lub nce ntau ntawm cov Cheebtsam, txhiab, nyob rau hauv Circuit Court PCB txij nkawm, tshwj xeeb tshaj yog muaj luam Circuit Court board txij nkawm qhov chaw, muaj ntau yam ntawm lub Cheebtsam yog tsis pom, los yog txawm tsis tau hnov ntawm, txawm yog ib co lwm yam ntawm cov ntaub ntawv yog tiav lawm, cov board nyob rau hauv tes, tiam sis yuav nyeem cov ntaub ntawv nyob rau hauv lub computer tsom xam, yog tias tsis yog ib tug ceev mus nrhiav txoj kev, tus txij nkawm ua hauj lwm zoo yuav muag ntawm ib tug luv nqi heev, muaj hluav taws xob kho teb, efficiency yog nyiaj, yog li xaiv ib tug zoo PCB los yog PCB los ua ke tsum yog qho tseem ceeb heev, xav kom King-PCB.com rau koj.