TDR kalma ce ta Reflectometry ta lokaci. Fasaha ce ta auna nesa wadda ke nazarin raƙuman ruwa da aka nuna kuma tana koyon matsayin abin da aka auna a matsayin mai sarrafa nesa. Bugu da ƙari, akwai reflectometry ta lokaci; Relay na jinkirta lokaci; Ana amfani da Rijistar Bayanai ta hanyar sadarwa galibi a matakin farko don gano matsayin kebul na sadarwa, don haka ana kiransa "mai gano kebul". Reflectometer na lokaci kayan aiki ne na lantarki wanda ke amfani da na'urar auna lokaci don gano lahani a cikin kebul na ƙarfe (misali, kebul na biyu ko coaxial). Hakanan ana iya amfani da shi don gano rashin daidaituwa a cikin masu haɗawa, allunan da'ira da aka buga, ko duk wata hanyar lantarki.
Tsarin amfani na E5071c-tdr zai iya samar da taswirar ido da aka kwaikwayi ba tare da amfani da ƙarin janareta lambar ba; Idan kuna buƙatar taswirar ido ta ainihin lokaci, ƙara janareta sigina don kammala aunawa! E5071C yana da wannan aikin
Bayani game da ka'idar watsa sigina
A cikin 'yan shekarun nan, tare da saurin inganta ƙimar bit na ƙa'idodin sadarwa na dijital, misali, mafi sauƙin ƙimar bit na mabukaci USB 3.1 har ma ya kai 10Gbps; USB4 yana samun 40Gbps; Inganta ƙimar bit yana sa matsalolin da ba a taɓa gani ba a tsarin dijital na gargajiya suka fara bayyana. Matsaloli kamar tunani da asara na iya haifar da karkacewar siginar dijital, wanda ke haifar da kurakuran bit; Bugu da ƙari, saboda raguwar lokacin da aka yarda don tabbatar da ingantaccen aikin na'urar, karkacewar lokaci a hanyar siginar ya zama da mahimmanci. Raƙuman lantarki na radiation da haɗin gwiwa da ƙarfin da ba ya nan da nan suka samar za su haifar da magana ta hanyar haɗin gwiwa kuma su sa na'urar ta yi aiki ba daidai ba. Yayin da da'irori ke ƙara ƙanƙanta da matsewa, wannan ya zama matsala; Abin da ya ƙara ta'azzara al'amura, raguwar ƙarfin lantarki na wadata zai haifar da ƙarancin rabon sigina-zuwa-amo, yana sa na'urar ta fi saurin kamuwa da hayaniya;
Daidaito a tsaye na TDR shine impedance
TDR yana ciyar da raƙuman matakai daga tashar jiragen ruwa zuwa da'irar, amma me yasa sashin tsaye na TDR ba ƙarfin lantarki ba ne amma impedance? Idan impedance ne, me yasa za ku iya ganin gefen da ke tashi? Waɗanne ma'auni ne TDR ke yi bisa ga Vector Network Analyzer (VNA)?
VNA kayan aiki ne don auna amsawar mitar sashin da aka auna (DUT). Lokacin aunawa, ana shigar da siginar motsawa ta sinusoidal zuwa na'urar da aka auna, sannan ana samun sakamakon aunawa ta hanyar ƙididdige rabon girman vector tsakanin siginar shigarwa da siginar watsawa (S21) ko siginar da aka nuna (S11). Ana iya samun halayen amsawar mitar na'urar ta hanyar duba siginar shigarwa a cikin kewayon mitar da aka auna. Amfani da matatar wucewa ta band a cikin mai karɓar aunawa na iya cire hayaniya da siginar da ba a so daga sakamakon aunawa da inganta daidaiton aunawa
Tsarin zane na siginar shigarwa, siginar da aka nuna da siginar watsawa
Bayan duba bayanan, an gano cewa kayan aikin TDR sun daidaita girman ƙarfin wutar lantarki na raƙuman da aka nuna, sannan suka yi daidai da impedance. Ma'aunin nuni ρ daidai yake da ƙarfin wutar lantarki da aka nuna wanda aka raba ta hanyar ƙarfin shigarwa; Tunani yana faruwa inda impedance ɗin ba ya tsayawa, kuma ƙarfin wutar lantarki da aka nuna a baya yana daidai da bambanci tsakanin impedances, kuma ƙarfin shigarwar yana daidai da jimlar impedances. Don haka muna da dabara mai zuwa. Tunda tashar fitarwa ta kayan aikin TDR shine 50 ohms, Z0 = 50 ohms, don haka ana iya ƙididdige Z, wato, lanƙwasa impedance na TDR da aka samu ta hanyar zane.
Saboda haka, a cikin hoton da ke sama, impedance da aka gani a matakin farko na siginar ya fi ƙanƙanta fiye da 50 ohms, kuma gangaren yana da ƙarfi a gefen da ke tashi, yana nuna cewa impedance da aka gani ya yi daidai da nisan da aka yi tafiya a lokacin yaɗuwar siginar gaba. A wannan lokacin, impedance ɗin ba ya canzawa. Ina tsammanin yana da kama da zagaye a faɗi cewa ana ɗaukarsa kamar an tsotse gefen da ke tashi bayan rage impedance, kuma a ƙarshe ya ragu. A cikin hanyar da ta biyo baya ta ƙarancin impedance, ya fara nuna halayen gefen da ke tashi kuma ya ci gaba da tashi. Sannan impedance ɗin ya wuce 50 ohms, don haka siginar ta yi sama kaɗan, sannan a hankali ta dawo, kuma a ƙarshe ta daidaita a 50 ohms, kuma siginar ta isa tashar da ke akasin haka. Gabaɗaya, ana iya ɗaukar yankin da impedance ɗin ke faɗuwa a matsayin yana da nauyin capacitive a ƙasa. Yankin da impedance ɗin ke ƙaruwa kwatsam ana iya ɗaukarsa a matsayin yana da inductor a jere.
Lokacin Saƙo: Agusta-16-2022
