1. Iimpawu Icala kunye nokugcinwa capacitance of ibhodi circuit yolawulo mveliso
Ukusilela umonakalo capacitance lelona liphezulu kwizixhobo ze-elektroniki, ingakumbi xa capacitance electrolytic.
Ukungaphumeleli capacitance uboniswa ngolu hlobo lulandelayo: 1.The amandla mncinane; 2. Itotali ukulahleka umthamo; 3. Le ukuvuza; 4. A circuit short.
Capacitors zidlala indima ezahlukeneyo kwisekethe, kwaye ukusilela nazo characterized.In ulawulo mveliso eshicilelweyo ibhodi yesekethe, Ibhodi yesekethe lwedijithali isininzi, lo capacitor isetyenziselwa ukwenza icebo lokucoca amandla, nokuhlangana umqondiso kunye capacitance yaloo mmandla oscillator zezi less.If le capacitor electrolytic asetyenziswe isenza i umbane yonakele, ubonelelo ziguquka bamandla ngeke engcangcazelayo, yaye akukho ombane output.Or ukuhluza imveliso ombane akulunganga, wesiphaluka ngenxa kwamandla ukungazinzi ukudideka ubhalo, ukusebenza umatshini iiyure zomsebenzi okanye ayikwazi ukuvula umatshini, ukuba capacitor kunye sekethe digital ibhodi unikezelo lwamandla phakathi ezintle nezimbi, ukusebenza above.This somelele ingakumbi kufutshane motherboard computer, abaninzi ukusebenzisa ikhompyutha livela maxa wambi ayikwazi ukuvula umatshini iminyaka emininzi, lo mkhuba ngamanye amaxesha oluvula luvaleke, vula ityala, asoloko electrolytic capacitor beat nesenzeko zingabonakala, ukuba capacitor phantsi ukulinganisa umthamo ukufumana usezantsi kakhulu ixabiso elililo.
Ubomi capacitor sihlobene ngqo lobushushu voice. Uphakamile ubushushu esingqongileyo, le mihlathana life.This capacitor kulawula kuphela usebenza capacitors electrolytic kodwa nakwezinye capacitors.Therefore, ekufuneni ngenxa capacitance ukungaphumeleli, kuyimfuneko ukuba ukukhangela capacitance leyo iyelelene ubushushu umthombo, ezifana capacitance ecaleni kwi radiator namandla eliphezulu amacandelo ndawonye. Ukusondela kuyo, kokukhona ke ukuba damaged.Have walungiswa i X-ray siphaku tshin unikezelo lwamandla, abasebenzisi zibonisa beza umsi kuphuma umbane, vula ityala emva kokufika 1000 uF / 350 v capacitor enkulu na izinto olunamafutha ngaphandle, udilize vula uhle ukuba umthamo kwamashumi nje ezimbalwa uF, lufumanise ukuba kuphela capacitance kwe bhulorho rectifier nobushushu ukutshona elikufutshane, enye evela kude sivaleke vingci, umthamo na Ngaphezu normal.In, kukho kwisiphaluka elifutshane capacitance of China chip, kwaye uyifumane kwakhona ukuba capacitor yi likufutshane ubushushu parts.Therefore, kufuneka ziqwalaselwe xa sifuna ukulungiswa.
Abanye ukuvuza capacitive kunobuzaza kakhulu, ngomnwe kwebala Unga eshushu, olu hlobo capacitor kufuneka utshintshe.
Kwimeko okulungileyo nokubi breakdowns, iphutha iqhelekileyo ukusilela capacitance damage.So kwi kusilela, capacitance kuba ngundoqo ukukhangela, emva kokuba ukutshintsha capacitance amaxesha Akumangalisi (ke kufuneka sinikele ingqalelo umgangatho le capacitance, khetha brand ngcono, ezifana isardiyo, abamnyama kunye like).
2. Iimpawu kunye olungenacalulo umonakalo ukumelana
Resistors zezona yeendima nentlaninge izixhobo zombane, kodwa hayi umonakalo components.Resistance kakhulu ezonakeleyo yeyona ndlela iqhelekileyo ukuvula endleleni, kwaye uxhathiso lunqabile kwaye uxhathiso akukho ukuxhathisa film carbon rare.Common kakhulu, ukumelana metal umboniso, ucingo ukumelana nobetho inshorensi resistance.The kakhulu phambi iintlobo ezimbini ukuxhathisa, indlela ebonakala umonakalo kwalo ukumelana ephantsi (ngezantsi 100 Ω) kunye ixabiso eliphezulu (ngaphezu kwe-100 Ω k) izinga umonakalo iphezulu, ukumelana eliphakathi (ezifana nekhulu ambalwa ukuba amashumi amawaka yaseYurophu) umonakalo encinane; eyesibini kukuba ukungawi uxhathiso elisezantsi isoloko zalaba kwaye abamnyama, yaye kulula ukufumana ukuba kukho bambalwa amanqaku xa ukungawi ukumelana ephezulu damaged.Wire isilonda uxhathiso ngokubanzi isetyenziswa enkulu flow umda zangoku, kwaye uxhathiso akukho large.Some le micwe zezindlu ukuba mnyama okanye umphezulu uqhushumbiso, amathanda okanye akukho ukuxhathisa marks.Cement luhlobo wire wou nd ukuxhathisa, nto leyo kophuka elinyukayo, kungenjalo akukho ebonakalayo trace.When luvukelo inshorensi ukutsha, ezinye iindawo kukubasela up iqhekeza yesikhumba, ezinye ayinazo umkhondo, kodwa akayi blackened.According kungentla iimpawu, xa ekuhloleni ukuxhathisa, uyakwazi igxile, ngokukhawuleza ukuchonga ukungawi yonakele.
Ngokutsho iimpawu zidweliswe ngasentla, singakwazi kuqala luqwalasele amaxabiso ephantsi ukuxhathisa naziphi na iimpawu mnyama phezu kwiibhodi wesekethe eziprintiweyo , uze ke umonakalo uninzi zexabiso okanye babe ezinkulu kwaye kulula ukuba umonakalo iimpawu of amaxabiso aphezulu ukumelana, singakwazi ukusebenzisa umthamo multimeter ngqo resistances aphezulu kakhulu iibhodi pcb wesiphaluka kuwo omabini iziphelo kweelana yenkcaso, ukuba isixa uxhathiso mkhulu ngaphezu kwexabiso elibekiweyo, lo uxhathiso kufuneka yonakele (ahlawule ingqalelo ukuba, ezifana nokumelana ezinzileyo abonisa emva kuphela izigqibo, kuba kusenokwenzeka shunt capacitance e kumacandelo wesiphaluka, kukho intlawulo kunye nenkqubo ukubhobhoza), ukuba isixa uxhathiso incincane kune kwexabiso elibekiweyo, nina jikelele musa ukuba ngoyaba oko. Nantso enilinganisela ngayo yonke resistor kwibhodi yesekethe pcb eziprintiweyo, nakuba i "ephosakeleyo," iwaka, akuyi omnye.
Uvavanyo 3.the indlela ye lo mshini zokusebenza
msindo zokusebenza discriminant kangangethuba computer maintenance ezimbalwa nobunzima ezithile, hayi kuphela iqondo ubudlelwane zenkcubeko, ndiyathemba oko kuya kukunceda ukuba baxoxe oku nawe.
Lo msindo wokusebenza ofanelekileyo neneempawu "mfutshane yenyani" yaye "break yenyani". Ezi mpawu zimbini ziluncedo kakhulu xa kuhlalutywa wesekethe lothutho ukuze application.In yomgama ukuqinisekisa isicelo yomgama, izithuthi kufuneka asebenze phantsi loop evaliweyo (feedback negative) .Ukuba akukho ingxelo negative, yomtya yokukhulisa evulekileyo i comparator.If lo isixhobo ukuba bagwetywe, kufuneka icace nokuba ifowuni isetyenziswa njenge msindo okanye comparator kwisekethe.
Enoba yintoni uhlobo ngombhobho, kukho resistor feedback RF, ngoko xa silungisa Ungakhangela uxhathiso ingxelo endleleni kombane, esebenzisa multimeter ukukhangela imveliso kwaye umva igalelo, umlo phakathi ukuba ezinkulu, ezifana ngaphezulu nje ezimbalwa M Ω, ngoko sinokuqiniseka isixhobo mhlawumbi ukwenza ngakumbi, ukuba ixabiso 0 Ω ngayo ezincinci k Ω, jonga ukuba umlo phakathi output kwaye umva igalelo, wokukhulisa esebenzisa amagama aya kukwenza.
Ngokutsho kumgaqo msindo virtual elifutshane, oko kukuthi, ukuba lo mshini zokusebenza ayisebenzi ngendlela efanelekileyo, igalelo elifanayo umva ombane input iya kulingana, nangona kukho umahluko kwakhona kwinqanaba MV, Kakade ke, kweminye igalelo eliphezulu multimeters ukuvimba yesekethe ukumelana ziya kuba nempembelelo encinane kwi test ombane, kodwa ngokubanzi hayi ngaphezulu kwe 0.2 V, ukuba umahluko abangaphezu kwe-0.5 V, lo mshini nakanjani kubi!
Ukuba ifowuni isetyenziswa comparer, oko kuvumela efanayo ukuba ezahlukeneyo ukusuka terminal input kunye terminal input umva. Le ombane le ombane efanayo malunga>, kwaye ombane imveliso leyo likufutshane xabiso liphezulu positive.The ombane leyo ombane umva, kwaye ombane imveliso seliza 0V okanye iphezulu embi (kuxhomekeke emandleni ezimbini okanye amandla single) .Ukuba ombane ubhaqo ntoni na lo mthetho, ngoko ke isixhobo linokonakala! Ngoko ke musa ukuba usebenzise indlela endaweni, akunyanzelekanga ukuba Yodilizwa chip phezu eshicilelweyo ibhodi yeseketheukuba ngumgwebi ukusebenza lo mshini.
4. A iqhinga encinane ukuvavanya amacandelo SMT in a multimeter
Abanye isiqalelo patch mncinane gqitha, esebenzisa iintlanti multimeter eziqhelekileyo kunye nokugcinwa uvavanyo olo elula kakhulu, kusenokwenzeka ukuba isekethe elifutshane, okwesibini ukuba camera kunye yokugquma enamathela beplanga pin inkxamleko kungena adibane licandelo ungamalungu yesinyithi. Nantsi indlela elula ukukunika ezininzi lula.
Zithabathele iziqwenga ezimbini ubuncinane inani neenaliti, ukugcinwa ubuchwepheshe mveliso (ubunzulu) kunye multimeter nkqi, uze emva koko uthabathe ucingo entle ngakumbi ngobhedu intambo, kukho iintlanti ngocingo zobhedu olubengezela kakuhle kunye iinaliti zibotshwe kunye, reoccupy solder weld.With ezinjalo iintlanti icebiso amancinane ukulinganisa SMT bedibana amacandelo xa kungekho ibhodi wesekethe elifutshane, kwaye ukukhomba emnweni yokugquma ukutyabeka, ukuthatha indawo ephambili, musa ungenakuwuxhalabela azikrwele le ndizayo ndizayo.
5. indlela Ukulungiswa ebhodini circuit kwamandla karhulumente short
Ezishicilelweyo isondlo kwibhodi wesekethe, ukuba udibana tyala elifutshane yesekethe umbane uluntu kaninzi wokuqala omkhulu, ngenxa yokuba izixhobo abaninzi ukwabelana unikezelo lwamandla enye, isixhobo ngamnye utshintshe nje unikezelo lwamandla, kukho urhano kwisekethe elifutshane, ukuba plate element ayikho kakhulu, ukwamkela indlela 'nokuhlakula umhlaba "inokufumaneka ingongoma mfutshane-wesekethe, ukuba amacandelo amaninzi kakhulu-SMT, ngaba' nokuhlakula umhlaba" ngamagaba kwi imeko iya kuxhomekeka luck.In le ingcebiso ophumelela ndlela, ukusebenzisa le ndlela, kabini umsebenzi, ngokufuthi unako ngokukhawuleza ufumane inqaku ukungaphumeleli.
Ukuze ube ombane yangoku lonke unikezelo lwamandla adjustable, ombane 0-30v, 0-3a yangoku, le umbane ayikho eninzi, 300RMB okanye ezivulekileyo so.Will yesekethe ombane ukuya kwinqanaba ombane unikezelo lwamandla isixhobo, ngoku ukuze ubuncinane kuqala, yongeza ombane kule isekethi zombane umbane 5 v amanqaku ezifana engenelela series 74, no 0 v icala, kuxhomekeke iqondo wesekethe elifutshane, unyuko zangoku ngokucothayo, kunye isixhobo ngesandla ngaphandle kwebala, xa kwebala ukuya zokufudumeza ethile isixhobo components smd ngokucacileyo, oku kudla yonakele, asuswe ukuze uqinisekise ngakumbi ikhosi measurement.Of, le ombane kufuneka ingadluli indlela ombane lonxibelelwano device, kwaye alidityaniswanga kwi counter, kungenjalo litshise ezinye izixhobo ezilungileyo.
6A irula encinane, ukusombulula ingxaki enkulu
Ngakumbi kwaye ezisetyenziswayo kakhulu kwimizi ulawulo eziprintiweyo wesekethe iibhodi pcb , iindlela ezininzi kwibhodi ngomnwe ngegolide lifakwa slot. Ngenxa bume mveliso embi, uthuli, ukufuma, bume igesi bako uvelisa ukungaphumeleli contact ihlwempu kulula ukwenza ikhadi, nabahlobo abaninzi isenokuba indlela yokusombulula le ngxaki ngokutshintsha ikhadi interface, kodwa iindleko bathenge ikhadi sikhulu kakhulu, ingakumbi ezinye izixhobo ngaphandle kwe card.In Enyanisweni, usenokuba ngokunjalo ukusebenzisa i yokucima ukosula amaxesha ambalwa ngomnwe ngegolide, ekucoceni ukungcola phezu ngomnwe ngegolide, ngoko uzame kwakhona, mhlawumbi ukusombulula le ngxaki! le ndlela ilula kwaye aluncedo.
Uhlalutyo 7.The lweempazamo zombane embi ngamaxesha elungileyo
Zonke iintlobo amaxesha elungileyo kunye nokusilela zombane embi zingaquka ezi meko zilandelayo:
1. umfowunelwa embi
qha Bad kunye slot, ezinjengokwaphuka yangaphakathi iintambo, qhagamshelana kakubi wire plug kunye terminal, kunye nokudibanisa iintsimbi virtual inamacandelo, njl
2. Le uphawu waphazamiseka
Kuba iziphaluka digital, kwimeko kwemiqathango ethile, kona langoku, kwangathi ngokwenene yinkqubo kakhulu yolawulo uphazamiseko echaphazela kube kuphosakele, nazo ibhodi yesekethe parameters ikhomponenti okanye iparameters ngamnye intsebenzo iyonke yatshintsha, i ubuchule anti-uphazamiseko kubo indawo wumbe, nanku ukungaphumeleli;
3. uzinzo thermal inamacandelo akulunganga
Ukusuka inani elikhulu izenzo yesondlo, uzinzo wobushushu le capacitor yokuqala electrolytic akulunganga, elandelwa kwezinye capacitors, triode, ode, IC, ukumelana, njl
4. Kukho ukufuma nothuli kwibhodi yesekethe
Ukufuma uthuli baya kuqhuba umbane, ukususela ukumelana, kodwa inkqubo bilges ubushushu ukuqalelisa nciphisa ukumelana nayo iya kutshintsha, isiphumo ukuxhathisa kunye namanye amalunga ngaxeshanye, isiphumo unamandla uyakwazi ukutshintsha xa parameters wesekethe, yenza ukungaphumeleli;
5.Software naye into
abaninzi parameters asetyenziswe beesekethe ukuze ukunyenyisa software, nomxhesho ezithile parameters kwi ephantsi kakhulu, kuluhlu ezibalulekileyo, xa umsebenzi kumatshini ukuthobela software tyala sizathu, emva koko kuya kuvela i alarm.
8. Indlela ngokukhawuleza ukufumana ulwazi amacandelo?
Elektroniki Modern na ngeentlobo, uluhlu ngokuya ngokubanzi amacandelo, amawaka, kulondolozo pcb wesiphaluka, ingakumbi kwimizi-mveliso eziprintiweyo iindawo zolondolozo ibhodi zeesekethe, uninzi amacandelo kungabonwa, okanye zange weva, kwanokuba ezinye amacandelo ulwazi epheleleyo, ibhodi esandleni kodwa ukufunda idata kuhlalutyo computer, ukuba akukho indlela yokukhangela okukhawulezayo, ukwanela yesondlo iza kuthengiswa isaphulelo kakhulu, zoshishino intsimi ukulungiswa ngekhompyutha, ngendlela eyiyo na imali, ngoko ungakhetha PCB elungileyo okanye Assembly PCB umthengisi kubaluleke kakhulu, angathanda ukuba isiphakamiso King-PCB.com kuwe.