Kunamapharamitha amaningi we-resistor, ngokuvamile sivame ukukhathazeka mayelana nenani, ukunemba, inani lamandla, lezi zinkomba ezintathu zifanelekile.Kuyiqiniso ukuthi kumasekethe edijithali, asikho isidingo sokunaka imininingwane eminingi, ngemuva kwakho konke, kukhona u-1 no-0 kuphela ngaphakathi kwedijithali, hhayi kakhulu ukubala umthelela omncane.Kodwa emijikelezweni ye-analog, lapho sisebenzisa umthombo we-voltage onembile, noma ukuguqulwa kwe-analog-to-digital yamasignali, noma sikhulise isignali ebuthakathaka, ukuguqulwa okuncane kwenani lokumelana kuzoba nomthelela omkhulu.Ngesikhathi sokungqubuzana ne-resistor, yiqiniso, kusesimweni sokucubungula amasignali e-analog, futhi kamuva, ngokuvumelana nezinhlelo zokusebenza zesekethe ye-analog ukuhlaziya umthelela wepharamitha ngayinye ye-resistor.
Inani lenani lokumelana le-resistor - inani lenani lokumelana lokukhethwa kwe-resistor ngokuvamile lilungiswa uhlelo lokusebenza, njengomkhawulo wamanje wesibani se-LED, noma isampula yesignali yamanje, inani lokumelana le-resistor ngokuyisisekelo azikho ezinye izinketho.Kodwa kwezinye izikhathi, kunezinhlobonhlobo zokukhethwa kwe-resistor, njengokukhuliswa kwesignali kagesi, njengoba kukhonjisiwe esithombeni, ukukhuliswa kuhlobene nesilinganiso sika-R2 kuya ku-R3, futhi akuhlangene nenani u-R2 no-R3.Ngalesi sikhathi, ukukhethwa kokumelana ne-resistor kusasekelwe: kukhulu ukumelana kwe-resistor, umsindo omkhulu oshisayo, kubi kakhulu ukusebenza kwe-amplifier;kuncane ukumelana kwe-resistor, umsebenzi omkhulu ungowamanje, umsindo omkhulu wamanje, ukusebenza kwe-amplifier kubi kakhulu;lesi yisizathu esenza ukuthi izifunda eziningi zokukhulisa i-amplification zibe amashumi okumelana no-K, kunesidingo sokusebenzisa inani elikhulu lokumelana, noma ukusetshenziswa kwabalandeli be-voltage, noma ukusetshenziswa kwe-T-networks ukugwema.
I-Amp engaguquki
Ukunemba kwe-resistor - ukunemba kwe-resistor kuqondwa kahle, lapha musa i-verbose.Ukunemba kwe-Resistor ngokuvamile kungu-1% no-5%, ukunemba kuya ku-0.1%, njll. Intengo ka-0.1% cishe iphindwe kashumi ngaphezu kuka-1%, kanti u-1% cishe izikhathi ezingu-1.3 ngaphezu kuka-5%.Ngokuvamile, ikhodi yokunemba A=0.05%, B=0.1%, C=0.25%, D=0.5%, F=1%, G=2%, J=5%, K=10%, M=20%.
Amandla angaphambili we-resistor - amandla okumelana abelula kakhulu, kodwa ngokuvamile kulula ukuwasebenzisa ngokungafanele.Isibonelo, i-2512 chip resistor, amandla we-quota yi-1W, ngokusho kwemininingwane ye-resistor, izinga lokushisa lidlula ama-70 degrees Celsius, i-resistor kufanele incishiswe ukuze isetshenziswe.2512 chip resistor ekugcineni angakanani amandla angasetshenziswa, ekamelweni lokushisa, uma PCB pads ngaphandle kokwelashwa okukhethekile ukushabalalisa ukushisa, 2512 chip resistor amandla ukuze 0.3W, izinga lokushisa lingase libe ngaphezu kuka-100 noma ngisho 120 degrees Celsius..Emazingeni okushisa angu-125 degrees Celsius, ngokwezinga lokushisa elinciphisa ijika, inani lamandla angu-2512 lidinga ukuncishiswa libe ngu-30%.Lesi simo kunoma iyiphi i-resistors yephakheji kudingeka sinake, ungakholelwa emandleni okuzisholo, isikhundla esiyinhloko singcono kakhulu ukuhlola kabili ukugwema ukushiya izinkinga ezifihliwe.
I-Resistor ukumelana nevelu ye-voltage - inani le-resistor ukumelana ne-voltage ngokuvamile alishiwo kangako, ikakhulukazi kwabasanda kungena, ngokuvamile banomqondo omncane, becabanga ukuthi ama-capacitor anenani le-voltage kuphela.I-voltage engasetshenziswa kuzo zombili iziphetho ze-resistor, eyodwa inqunywa inani lamandla, ukuqinisekisa ukuthi amandla awadluli inani lamandla, enye ukumelana nenani le-resistor voltage.Nakuba amandla omzimba we-resistor engeqi amandla alinganiselwe, i-voltage ephezulu kakhulu ingaholela ekungazinzini kwe-resistor, i-creepage phakathi kwezikhonkwane ze-resistor, nokunye ukwehluleka, ngakho-ke kuyadingeka ukukhetha i-resistor enengqondo ngokuvumelana ne-voltage esetshenzisiwe.Amanye amaphakheji amelana namanani we-voltage ahlanganisa: 0603 = 50V, 0805 = 100V, 1206 kuya ku-2512 = 200V, 1/4W ipulaki = 250V.Futhi, izinhlelo zokusebenza zesikhathi, i-voltage ku-resistor kufanele ibe mncane kune-quota ukumelana nevelu ye-voltage engaphezu kuka-20%, ngaphandle kwalokho kulula ukuba nezinkinga ngemva kwesikhathi eside.
I-coefficient yokushisa yokumelana - I-coefficient yokushisa yokumelana iyipharamitha echaza ukuguqulwa kokumelana nezinga lokushisa.Lokhu ikakhulukazi kunqunywa impahla Resistor, ngokuvamile aminyene ifilimu chip resistor 0603 iphakheji ngenhla angenza 100ppm / ℃, okusho ukuthi resistor kuma lokushisa kushintsha 25 degrees Celsius, ukubaluleka ukumelana kungase kushintshe ngo-0.25%.Uma kuyi-12bit ADC, ukuguqulwa okungu-0.25% kungu-10 LSB.Ngakho-ke, i-op-amp efana ne-AD620, ethembele ku-resistor eyodwa kuphela ukulungisa ukukhulisa, onjiniyela abaningi bakudala ngeke bayisebenzisele ukwenza kube lula, bazosebenzisa isifunda esivamile ukulungisa ukukhulisa ngesilinganiso sabaphikisi ababili.Lapho ama-resistors ewuhlobo olufanayo lwe-resistors, ukuguqulwa kwenani lokumelana okubangelwa izinga lokushisa ngeke kulethe ukuguqulwa kwesilinganiso, futhi isifunda sizozinza kakhulu.Ku-instrumentation enembayo edinga kakhulu, kuzosetshenziswa izithasiselo zefilimu yensimbi, ukukhukhuleka kwazo kwezinga lokushisa kuye ku-10 kuye ku-20ppm kulula, kodwa-ke, kubiza kakhulu.Ngamafuphi, ekusetshenzisweni okunembayo kwesigaba sensimbi, i-coefficient yokushisa ngokuqinisekile iyipharamitha ebaluleke kakhulu, ukumelana akunembile kungalungisa imingcele esikoleni, ukuguqulwa kokumelana nokushisa kwangaphandle akulawulwa.
Isakhiwo se-resistor - isakhiwo se-resistor singaphezulu, lapha ukukhuluma ngesicelo esingacatshangwa.I-resistor yokuqalisa yomshini ngokuvamile isetshenziselwa ukushaja ngaphambili umthamo omkhulu we-aluminium electrolytic, bese uvala i-relay ukuze uvule amandla ngemva kokugcwalisa i-aluminium electrolytic.Lesi resistor sidinga ukumelana nokushaqeka, futhi kungcono kakhulu ukusebenzisa i-wirewound resistor enkulu.Inani lamandla we-resistor alibalulekile kakhulu, kodwa amandla asheshayo aphezulu, futhi ama-resistors avamile anzima ukuhlangabezana nezidingo.Izicelo zamandla kagesi aphezulu, njengezihluthulelo zokukhishwa kwe-capacitor, lapho i-voltage yangempela yokusebenza idlula ama-500V, kungcono kakhulu ukusebenzisa izimelambisi zokoqweqwe lwensimbi ezinamandla kagesi we-vitreous kunezixhasi ezijwayelekile zikasimende.Izinhlelo zokusebenza zokumuncwa kwe-spike, njengamamojula alawulwa yi-silicon emikhawulweni yomibili zidinga ukuhambisana ne-RC ukuze imunce, ukwenza ukuvikelwa kwe-dv/dt, kungcono kakhulu ukufeza izithasiselo ze-wirewound ezingasebenzisi inductive, ukuze kube nokusebenza kahle kokumuncwa kwezipikhi futhi kungabi lula. elinyazwe ukushaqeka.
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Isikhathi sokuthumela: May-19-2022