Maris 20, 2022
TDR yana aiki daidai da radar. Kayan aiki yana aika siginar bugun jini mai sauri cikin kebul. Lokacin da ya ci karo da katsewar impedance, ɓangaren kuzarin yana nuna baya.
TDR (Time Domain Reflectometry) yana aiki daidai da radar. Kayan aiki yana aika siginar bugun jini mai sauri cikin kebul. Lokacin da ya ci karo da katsewar impedance (kamar hutu, gajeriyar kewayawa, haɗin gwiwa, ko wurin ƙarewa), ɓangaren makamashi yana nuna baya. Kayan aiki yana auna bambancin lokaci tsakanin watsawar bugun jini da dawowar tunani, kuma hade tare da saurin yaduwar sigina a cikin matsakaici, yana ƙididdige nisa zuwa katsewa.
Wannan ƙa'ida tana da sauƙi, amma maɓalli da yawa suna shafar ta a aikace. Gudun yaɗa siginar ya bambanta a cikin nau'ikan kafofin watsa labarai na USB (karkatattun biyu yawanci suna yaduwa a 0.6 zuwa 0.7 saurin haske). Lokacin tashin bugun bugun jini yana ƙayyade ƙudurin sarari - gajeriyar lokacin tashi yana nufin ƙuduri mafi girma amma gajarta mafi girman nisa a aunawa. Girman girman siginar da aka nuna na iya gaya muku ko kuna ma'amala da buɗaɗɗen da'irar (tabbataccen tunani), gajeriyar da'ira (rauni mara kyau), ko rashin daidaituwa na impedance (wani juzu'i).
A cikin masu gano kebul na zamani, aikin TDR yawanci ana haɗa shi tare da auna tsayi. Silsilar PK652 na FangService wani nau'in nau'in TDR ne na yau da kullun - ba wai kawai yana gaya muku ko kebul ɗin yana aiki ba, amma kuma yana gaya muku jimlar tsawon na USB da takamaiman wurin hutu.
A cikin amfani mai amfani, gwajin TDR yana buƙatar ƙarshen kebul don samun dama (haɗe da kayan aiki), yayin da yanayin ɗayan ƙarshen yana rinjayar sakamakon aunawa. Idan ɗayan ƙarshen yana buɗe (ba a ƙare ba), kayan aikin yana ganin buɗaɗɗen tunani kuma yana iya ƙididdige jimlar tsayin kebul. Idan ɗayan ƙarshen ya ƙare tare da madaidaicin impedance mai kyau, ba a ganin tunani, kuma kawai nisa zuwa ƙarshen ƙarshen za'a iya aunawa. Idan ɗayan ƙarshen ya gajarta, ana ganin ɗan gajeren zango, kuma ana iya ƙididdige nisa.
TDR yana da ƙarfi amma ba ma'asumi ba. Anan akwai yanayin fassarori da yawa na gama gari. Na farko, idan akwai raguwa da yawa a cikin kebul, TDR na iya nuna mafi kusa - na farko da aka nuna alamun sigina daga nesa. Na biyu, idan hutu ya kasance kusa da kayan aiki (kamar tsakanin mita 1), lokacin yankin da ya mutu na kayan aikin na iya kasa warware shi, yana sa tunanin ya zama marar gani. Na uku, ƙaƙƙarfan mahalli na tsangwama na lantarki suna gabatar da amo wanda ke rage daidaiton ma'aunin TDR.
Bugu da ƙari, TDR yana auna nisan siginar lantarki, ba tsayin jiki ba. Idan kebul ya lanƙwasa kuma aka ja ta hanyar magudanar ruwa, ainihin tsayin jiki zai fi tazarar layin madaidaiciya da aka auna TDR. Lokacin bayar da rahoton bayanan gwaji, yana da mahimmanci a lura ko adadi shine 'tsawon wutar lantarki' ko 'tsawon jiki'.
Kafin TDR, ƙayyadaddun tsari don warware matsalar warwarewar kebul shine: dubawa na gani → sashe-sashe 排查 → tabbatar da maye gurbin. Wannan hanya ta kasance mai tasiri ga gajeriyar tazara da ƙananan ƙididdigar kebul, amma don nisa mai nisa, igiyoyi masu yawa, da ayyukan ɓoye, ingancin ya yi ƙasa sosai.
Fasahar TDR tana rage lokacin matsala daga 'awa'' zuwa 'mintuna'. ƙwararren injiniya mai amfani da jerin PK652 na iya gano hutu a cikin kebul na mita 100 a cikin mintuna, yayin da hanyoyin gargajiya na iya buƙatar buɗe akwatunan haɗin gwiwa da yawa da sashe ta sashe, ɗaukar sa'o'i ko ma fiye da haka.
Mafi mahimmanci, TDR hanya ce ta bincike mara lalacewa - baya buƙatar yanke igiyoyi ko buɗe masu haɗawa, guje wa lalata na biyu na kebul. Wannan yana da mahimmanci musamman a cikin ayyukan ɓoye da aka riga aka kammala.
TDR ita ce ginshikin fasaha don gwajin kebul na lantarki, yayin da a gwajin fiber optic, irin wannan dabarar amma mafi rikitarwa ana kiranta OTDR (Optical Time Domain Reflectometry). OTDR yana aika bugun jini na gani a cikin fiber kuma yana nazarin haske mai haske don tantance karyewa, asarar rashi, asarar haɗin haɗi, da tsayin duka.
Daga TDR zuwa OTDR, ainihin ma'anar fasahar gwajin kebul ba ta canza ba - dukansu biyu suna amfani da sigina masu nunawa don 'gani' abin da ke faruwa a cikin kebul ɗin. Abin da ya canza shine kawai mai ɗaukar siginar (lantarki vs na gani) da daidaiton aunawa. Layin gwajin kebul na FangService a halin yanzu yana mai da hankali kan gwajin kebul na lantarki (PK651/PK652/PK653+/PK659), yana ba da cikakkun hanyoyin gwaji don sadarwa da injiniyan igiyoyin lantarki. Kamar yadda kebul na fiber ya zama mafi girma, samfuran nau'in OTDR za su zama mahimmancin madaidaicin layi. View the Cable Test Instruments Collection
Faɗa mana yanayin aikin ku da buƙatun ku, kuma za mu dace da mafita mai kyau kuma za mu ba da ƙima a cikin sa'o'i 24.
Samu Magana KyautaPK651 analog/digital cable finder, PK652 finder with length measurement, PK653+ multi-range finder (100M/300M/400M), PK659 multifunction finder — four series covering the complete needs from basic continuity verification to advanced fault location. High-precision identification, up to 600M length measurement, rapid fault location — designed for installation and maintenance of network, telephone, and electrical cabling systems.
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