Kukho iiparameters ezininzi ze-resistor, ngokuqhelekileyo sixhalabile malunga nexabiso, ukuchaneka, inani lamandla, ezi zikhombisi zintathu zifanelekile.Kuyinyani ukuba kwiisekethe zedijithali, akudingeki ukuba sinikele ingqalelo kwiinkcukacha ezininzi, emva koko, kukho i-1 kunye ne-0 kuphela ngaphakathi kwedijithali, kungekhona ukubala impembelelo encinci.Kodwa kwiisekethe ze-analog, xa sisebenzisa umthombo ochanekileyo we-voltage, okanye ukuguqulwa kwe-analog-to-digital yezibonakaliso, okanye ukukhulisa umqondiso obuthathaka, utshintsho oluncinci kwixabiso lokumelana luya kuba nefuthe elikhulu.Ngexesha lokubetha nge-resistor, ngokuqinisekileyo, kukwithuba lokucubungula iimpawu ze-analog, kwaye kamva, ngokuhambelana nezicelo zesekethe ye-analog ukuhlalutya impembelelo yeparameter nganye ye-resistor.
Ubungakanani bexabiso lokumelana ne-resistor - inani lexabiso lokumelana nokukhethwa kwe-resistor lihlala lilungiswa ngesicelo, njengomlinganiselo wesibane sesibane se-LED, okanye isampuli yesignali yangoku, ixabiso lokumelana ne-resistor ngokusisiseko akukho ezinye iinketho.Kodwa ngamanye amaxesha, kukho iindlela ezahlukeneyo zokukhetha isichasi, njengokunyuswa komqondiso wombane, njengoko kubonisiwe kumfanekiso, ulwandiso lunxulumene nomyinge we-R2 ukuya kwi-R3, kwaye ayinanto yakwenza nexabiso I-R2 kunye ne-R3.Ngeli xesha, ukhetho lokumelana ne-resistor lusesekelwe kwi: ukuxhatshazwa okukhulu kwe-resistor, ingxolo enkulu ye-thermal, ngakumbi ukusebenza kwe-amplifier;incinci ukuchasana kwe-resistor, umsebenzi omkhulu ungoku, ingxolo enkulu yangoku, imbi kakhulu ukusebenza kwe-amplifier;esi sizathu sokuba iisekethe ezininzi zokukhulisa ishumi loxhathiso lwe-K, kukho imfuneko yokusebenzisa ixabiso elikhulu lokuxhathisa, okanye ukusetyenziswa kwabalandeli bombane, okanye ukusetyenziswa kwe-T-networks ukuphepha.
I-Amp engaguquliyo
Ukuchaneka kwe-resistor - ukuchaneka kwe-resistor kuqondwa kakuhle, apha musa i-verbose.Ukuchaneka kwe-Resistor ngokuqhelekileyo yi-1% kunye ne-5%, ukuchaneka ukuya kwi-0.1%, njl.Ngokubanzi, ikhowudi yokuchaneka A=0.05%, B=0.1%, C=0.25%, D=0.5%, F=1%, G=2%, J=5%, K=10%, M=20%.
Amandla angaphambili wesichasi – amandla esichasi ebeya kuba lula kakhulu, kodwa amaxesha amaninzi kulula ukuwasebenzisa ngokungafanelekanga.Ngokomzekelo, i-2512 chip resistor, amandla e-quota yi-1W, ngokweenkcukacha ze-resistor, iqondo lokushisa lidlula i-70 degrees Celsius, i-resistor kufuneka incitshiswe ukusetyenziswa.2512 chip resistor ekugqibeleni amandla angakanani anokusetyenziswa, kwiqondo lobushushu, ukuba PCB pads ngaphandle unyango olukhethekileyo ukutshatyalaliswa ubushushu, 2512 chip resistor amandla ukuya 0.3W, ubushushu kunokuba ngaphezu kwe-100 okanye nkqu 120 degrees Celsius..Kwiqondo lobushushu le-125 degrees Celsius, ngokwe-curve derating curve, umthamo we-2512 amandla kufuneka uncitshiswe ukuya kuma-30%.Le meko kuyo nayiphi na i-resistors yepakethe kufuneka inikele ingqalelo, musani ukukholelwa kumandla aqhelekileyo, indawo ephambili ingcono ukujonga kabini ukuphepha ukushiya iingxaki ezifihliweyo.
I-Resistor ukumelana nexabiso le-voltage-ixabiso lokumelana ne-voltage lihlala lichazwa kancinci, ngakumbi kwabaqalayo, bahlala benombono omncinci, becinga ukuba ii-capacitors zinokumelana nexabiso lombane.I-voltage enokuthi isetyenziswe kuzo zombini iziphelo ze-resistor, enye inqunywe ngumlinganiselo wamandla, ukuqinisekisa ukuba amandla awadluli umlinganiselo wamandla, enye kukuchasana kwexabiso le-resistor voltage.Nangona amandla omzimba we-resistor engagqithisi amandla alinganisiweyo, i-voltage ephezulu kakhulu inokukhokelela ekungazinzini kokumelana, i-creepage phakathi kwezikhonkwane ze-resistor, kunye nezinye iintsilelo, ngoko ke kuyimfuneko ukukhetha i-resistor efanelekileyo ngokombane osetyenzisiweyo.Ezinye zeepakethe zokumelana namaxabiso ombane ziquka: 0603 = 50V, 0805 = 100V, 1206 ukuya ku-2512 = 200V, 1/4W iplagi-in = 250V.Kwaye, ukusetyenziswa kwexesha, i-voltage kwi-resistor kufuneka ibe yincinci kune-quota yokumelana nexabiso le-voltage engaphezu kwe-20%, ngaphandle koko kulula ukuba neengxaki emva kwexesha elide.
I-coefficient ye-temperature yokumelana - I-coefficient yeqondo lokushisa lokumelana yiparameter echaza utshintsho lokumelana nokushisa.Oku kumiselwa ikakhulu ngezinto resistor, ngokubanzi ifilimu eshinyeneyo chip resistor 0603 ipakethe ngasentla ungenza 100ppm / ℃, nto leyo ethetha ukuba ukumelana lobushushu ambient utshintsho 25 degrees Celsius, ixabiso ukumelana inokutshintsha nge 0.25%.Ukuba yi-12bit ADC, utshintsho lwe-0.25% yi-10 LSB.Ke ngoko, kwi-op-amp efana ne-AD620, exhomekeke kwi-resistor enye kuphela ukulungelelanisa ukukhulisa, iinjineli ezininzi ezindala aziyi kuyisebenzisela ukwenza lula, ziya kusebenzisa isekethe eqhelekileyo ukulungelelanisa ukukhulisa ngomlinganiselo wabaxhathisi ababini.Xa abachasi luhlobo olufanayo lwe-resistors, utshintsho kwixabiso lokuchasana elibangelwa ukushisa aliyi kuzisa utshintsho kumlinganiselo, kwaye isiphaluka siya kuzinza ngakumbi.Kwizixhobo ezichanekileyo ezifunwa kakhulu, izichasi zefilimu zentsimbi ziya kusetyenziswa, ukukhukuliseka kweqondo lobushushu ukuya kwi-10 ukuya kwi-20ppm kulula, kodwa kunjalo, kuyabiza kakhulu.Ngamafutshane, kwizicelo ezichanekileyo zeklasi yesixhobo, i-coefficient yeqondo lokushisa ngokuqinisekileyo ipharamitha ebaluleke kakhulu, ukuchasana akuchanekanga kunokulungelelanisa iiparitha esikolweni, ukuguqulwa kokumelana nokushisa kwangaphandle akulawulwa.
Ubume be-resistor - isakhiwo se-resistor singaphezulu, apha ukukhankanya isicelo esinokucingelwa.Ukuqala kokumelana nomatshini ngokuqhelekileyo kusetyenziselwa ukutshaja kwangaphambili umthamo omkhulu we-aluminium electrolytic, kwaye emva koko uvale i-relay ukuvula amandla emva kokuzalisa i-aluminium electrolytic.Esi sixhasi sidinga ukuxhathisa ukothuka, kwaye kungcono ukusebenzisa isixhasi esikhulu socingo.Umthamo wamandla we-resistor awubalulekanga kakhulu, kodwa amandla angoko nangoko aphezulu, kwaye abachasi abaqhelekileyo kunzima ukuhlangabezana neemfuno.Ukusetyenziswa kwamandla ombane aphezulu, okufana ne-resistors yokukhupha i-capacitor, apho owona mbane wokusebenza ungaphezulu kwe-500V, kungcono ukusebenzisa i-high voltage vitreous enamel resistors kunezixhasi eziqhelekileyo zesamente.Izicelo zokufunxa i-Spike, njengeemodyuli ezilawulwa ngesilicon kuzo zombini iziphelo kufuneka zihambelane ne-RC ukwenza ukufunxa, ukwenza ukhuseleko lwe-dv/dt, kungcono ukufezekisa izichasi ze-wirewound ezingeyo-inductive, ukuze ube nokusebenza kakuhle kwe-spikes kwaye kungabi lula. zonakaliswe kukothuka.
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