Eli candelo lichaza inkqubo yovavanyo lwe-TDR

I-TDR sisishunqulelo se-time-domain Reflectometry.Ithekhnoloji yokulinganisa ikude ehlalutya amaza abonakalisiweyo kwaye ifunda ubume bento elinganisiweyo kwindawo yokulawula kude.Ukongeza, kukho i-reflectometry ye-time domain;Ukuhanjiswa kwexesha lokulibaziseka;IRejista yeDatha yoThutho isetyenziswa ikakhulu kushishino lonxibelelwano kwibakala lokuqala ukubona indawo yokuqhawuka kwentambo yonxibelelwano, ngoko ikwabizwa ngokuba “yisixhobo sokubona intambo”.I-refleometer ye-time domain sisixhobo sombane esisebenzisa i-refleometer ye-time domain ukuze ibonise kwaye ifumane iimpazamo kwiintambo zetsimbi (umzekelo, i-twisted pair okanye i-coaxial cables).Isenokusetyenziswa kwakhona ukufumana ii-discontinuities kwizihlanganisi, iibhodi zesekethe eziprintiweyo, okanye nayiphi na enye indlela yombane.

I-E5071c-tdr ujongano lomsebenzisi lunokwenza imephu yamehlo efanisiweyo ngaphandle kokusebenzisa ikhowudi eyongezelelweyo yejenereyitha;Ukuba ufuna imephu yamehlo yexesha lokwenyani, yongeza umqondiso wejeneretha ukugqiba umlinganiselo!I-E5071C inalo msebenzi

Amagqabantshintshi ngethiyori yogqithiso lomqondiso

Kwiminyaka yakutshanje, ngokuphucuka ngokukhawuleza kwemilinganiselo yemigangatho yonxibelelwano lwedijithali, umzekelo, umthengi olula we-USB 3.1 umlinganiselo we-bit wade wafikelela kwi-10Gbps;I-USB4 ifumana i-40Gbps;Ukuphuculwa kwebit rate kwenza iingxaki ezingazange zibonwe kwinkqubo yedijithali yemveli ziqale ukuvela.Iingxaki ezinjengokucamngca kunye nokulahlekelwa kunokubangela ukuphazamiseka kwesignali yedijithali, okukhokelela kwiimpazamo ezincinci;Ukongeza, ngenxa yokuncipha komda wexesha elamkelekileyo ukuqinisekisa ukusebenza okuchanekileyo kwesixhobo, ukuphambuka kwexesha kwindlela yomqondiso kubaluleke kakhulu.Amaza ombane wombane kunye nokudityaniswa okuveliswe ngamandla alahlekileyo kuya kukhokelela kwi-crosstalk kwaye yenze isixhobo sisebenze ngokungalunganga.Njengoko iisekethe ziya zincinci kwaye ziqina, oku kuba yingxaki ngakumbi;Ukwenza izinto zibe zibi nakakhulu, ukunciphisa i-voltage yokubonelela kuya kubangela umlinganiselo ophantsi we-signal-to-noise, okwenza isixhobo sithinteke ngakumbi kwingxolo;

Ulungelelwaniso oluthe nkqo lwe-TDR yi-impedance

I-TDR ityisa inyathelo lamaza ukusuka kwizibuko ukuya kwisekethe, kodwa kutheni iyunithi ethe nkqo ye-TDR ingeyiyo i-voltage kodwa i-impedance?Ukuba i-impedance, kutheni ubona i-edge ekhulayo?Yiyiphi imilinganiselo eyenziwa yi-TDR esekelwe kwiVector Network Analyzer (VNA)?

I-VNA sisixhobo sokulinganisa ukuphendula rhoqo kwenxalenye elinganisiweyo (DUT).Xa ulinganisa, isignali yokuvuselela i-sinusoidal igalelo kwisixhobo esilinganisiweyo, kwaye ke iziphumo zokulinganisa zifunyenwe ngokubala i-vector amplitude ratio phakathi kwe-input signal kunye ne-transmission signal (S21) okanye i-signal ebonakalisiweyo (S11).Iimpawu zokuphendula rhoqo kwisixhobo zinokufunyanwa ngokuskena isignali yegalelo kuluhlu lwamaza okulinganisa.Ukusebenzisa i-band pass filter kumlinganiselo wokwamkela unokususa ingxolo kunye nomqondiso ongafunekiyo kwisiphumo sokulinganisa kunye nokuphucula ukuchaneka komlinganiselo.

Umzobo weSchematic wesignali yegalelo, umqondiso obonakalisiweyo kunye nesignali yokudlulisa

Emva kokujonga idatha, i-IT yafunyaniswa ukuba isixhobo se-TDR siqhelekile i-voltage amplitude yamaza abonakalisiweyo, kwaye emva koko yalingana ne-impedance.I-coefficient yokubonisa ρ ilingana nombane obonakalisiweyo owahlulwe yi-voltage yegalelo;Ukubonakaliswa kwenzeka apho i-impedance ingaqhubekiyo, kwaye i-voltage ebonakaliswe ngasemva ilingana nomahluko phakathi kwe-impedances, kwaye igalelo lombane lilingana nesimbuku se-impedances.Ke sinale fomula ilandelayo.Ekubeni i-port ephumayo yesixhobo se-TDR yi-50 ohms, i-Z0 = i-50 ohms, ngoko i-Z ingabalwa, oko kukuthi, i-curve ye-impedance ye-TDR efunyenwe ngesakhiwo.

Ke ngoko, kulo mzobo ungentla, uthintelo olubonwe kwinqanaba lokuqala lesehlo somqondiso lincinci kakhulu kune-50 ohms, kwaye ithambeka lizinzile ecaleni komphetho onyukayo, okubonisa ukuba ukuthintela okubonwayo kuhambelana nomgama ohanjiweyo ngexesha lokusasaza phambili. yomqondiso.Ngeli xesha, i-impedance ayitshintshi.Ndicinga ukuba kungqukuva ukutsho ukuba kuthathwa ngokungathi umphetho onyukayo wafunxwa emva kokuncitshiswa kwe-impedance, kwaye ekugqibeleni wehliswa.Kwindlela elandelayo ye-impedance ephantsi, yaqala ukubonisa iimpawu zomda wokunyuka kwaye waqhubeka nokunyuka.Kwaye ke i-impedance idlulela ngaphaya kwe-50 ohms, ngoko ke umqondiso udlula kancinci, emva koko ubuye kancinci, kwaye ekugqibeleni uzinzile kwi-50 ohms, kwaye umqondiso ufikelele kwelinye izibuko.Ngokubanzi, ummandla apho i-impedance yehla ingacingelwa njengomthwalo we-capacitive emhlabeni.Ummandla apho i-impedance inyuka ngequbuliso inokucingelwa ngokuba ne-inductor kuthotho.