TDR ipfupiso yeshoko rekuti time-domain Reflectometry. Iyi tekinoroji yekuyera iri kure inoongorora mafungu anoratidzwa uye inodzidza mamiriro echinhu chakayerwa panzvimbo yekudzora iri kure. Pamusoro pezvo, kune time domain reflectometry; Time-delay relay; Transmit Data Register inonyanya kushandiswa muindasitiri yekutaurirana pakutanga kuti ione nzvimbo yebreakpoint yetambo yekutaurirana, saka inonziwo "cable detector". Time domain reflectometer chishandiso chemagetsi chinoshandisa time domain reflectometer kuratidza nekuwana zvikanganiso mutambo dzesimbi (semuenzaniso, twisted pair kana coaxial cables). Inogona zvakare kushandiswa kuwana discontinuities mu connectors, printed circuit boards, kana chero imwe nzira yemagetsi.
E5071c-tdr user interface inogona kugadzira mepu yemaziso yakaedzwa pasina kushandisa imwe kodhi yekugadzira; Kana uchida mepu yemaziso yenguva chaiyo, wedzera jenareta yezviratidzo kuti upedze kuyerwa! E5071C ine basa iri
Pfupiso yedzidziso yekutumira chiratidzo
Mumakore achangopfuura, nekuvandudzika nekukurumidza kwehuwandu hwebit mumazinga ekutaurirana kwedhijitari, semuenzaniso, huwandu huri nyore hweUSB 3.1 bit rate hwakatosvika 10Gbps; USB4 inowana 40Gbps; Kuvandudzika kwebit rate kunoita kuti matambudziko asati amboonekwa muhurongwa hwedhijitari hwechinyakare atange kuoneka. Matambudziko akadai sekufungisisa uye kurasikirwa anogona kukonzera kukanganiswa kwedigital signal, zvichikonzera zvikanganiso zvebit; Pamusoro pezvo, nekuda kwekuderera kwemuganhu wenguva inogamuchirika kuti ive nechokwadi chekushanda kwakakodzera kwemudziyo, kutsauka kwenguva munzira yechiratidzo kunova kwakakosha zvikuru. Mafungu emagetsi emwaranzi uye coupling inogadzirwa ne stray capacitance zvinotungamira ku crosstalk uye zvinoita kuti mudziyo ushande zvisirizvo. Sezvo macircuit achiderera uye achioma, izvi zvinova dambudziko guru; Kuti zvinhu zvinyanye kuipa, kudzikiswa kwesimba remagetsi kuchaita kuti signal-to-noise ratio yakaderera, zvichiita kuti mudziyo uve nyore kubatwa neruzha;
Iyo yakatwasuka coordinate yeTDR ndiyo impedance
TDR inopa nhanho yekufamba kubva pachiteshi kuenda kudunhu, asi sei vertical unit yeTDR isiri voltage asi impedance? Kana iri impedance, sei uchikwanisa kuona kukwira kwemucheto? Ndezvipi zviyero zvinoitwa neTDR zvichibva paVector Network Analyzer (VNA)?
VNA chishandiso chekuyera mhinduro yefrequency yechikamu chakayerwa (DUT). Pakuyera, chiratidzo chekusimudzira sinusoidal chinopinzwa kumudziyo wakayerwa, uye mhedzisiro yekuyera inowanikwa nekuverenga chiyero chevector amplitude pakati pechiratidzo chekupinda nechiratidzo chekutumira (S21) kana chiratidzo chinoratidzwa (S11). Hunhu hwemhinduro yefrequency yemudziyo hunogona kuwanikwa nekutarisa chiratidzo chekupinda muhuwandu hwefrequency hwakayerwa. Kushandisa band pass filter muchiyero chekugamuchira kunogona kubvisa ruzha nechiratidzo chisingadiwe kubva mumhedzisiro yekuyera uye kuvandudza kurongeka kwekuyera.
Dhirowamu yechiratidzo chekupinda, chiratidzo chinoratidzwa uye chiratidzo chekutumira
Mushure mekutarisa data, IT yakawanikwa kuti chishandiso chaTDR chakagadzirisa voltage amplitude ye reflected wave, uye yobva yaenzanisa ne impedance. Reflection coefficient ρ yakaenzana ne reflected voltage yakakamurwa ne input voltage; Reflection inoitika apo impedance isingaenderere mberi, uye voltage reflected back inoenderana nemusiyano uripo pakati pe impedances, uye input voltage inoenderana nehuwandu hwe impedances. Saka tine fomura inotevera. Sezvo output port ye TDR instrument iri 50 ohms, Z0=50 ohms, saka Z inogona kuverengerwa, kureva kuti, impedance curve ye TDR yakawanikwa ne plot.
Saka, mumufananidzo uri pamusoro apa, impedance inoonekwa pakutanga kwechiitiko chechiratidzo idiki zvikuru pane 50 ohms, uye slope yakagadzikana pamwe chete nemucheto unokwira, zvichiratidza kuti impedance inoonekwa yakaenzana nedaro rakafambwa panguva yekupararira kwechiratidzo. Munguva iyi, impedance haichinji. Ndinofunga kuti zviri nyore kutaura kuti zvinoonekwa sekunge mupendero unokwira wakadhonzwa mushure mekuderedzwa kwe impedance, uye pakupedzisira wakaderedzwa. Munzira inotevera ye low impedance, yakatanga kuratidza hunhu hwemupendero unokwira uye yakaramba ichikwira. Uye ipapo impedance inodarika 50 ohms, saka chiratidzo chinodarika zvishoma, chobva chadzoka zvishoma nezvishoma, uye pakupedzisira chinogadzikana pa50 ohms, uye chiratidzo chasvika kune imwe chiteshi. Kazhinji, nzvimbo iyo impedance inodonha inogona kufungidzirwa seine capacitive load pasi. Nzvimbo iyo impedance inowedzera kamwe kamwe inogona kufungidzirwa seine inductor in series.
Nguva yekutumira: Nyamavhuvhu-16-2022
