Ko te TDR he whakarāpopototanga mō te Reflectometry rohe-wā. He hangarau ine mamao e tātari ana i ngā ngaru whakaata me te ako i te āhua o te mea i inehia i te tūranga mana mamao. Hei tāpiri, kei reira te reflectometry rohe-wā; te whakawhiti whakaroa-wā; te Rēhita Raraunga Tuku e whakamahia nuitia ana i roto i te umanga whakawhitiwhiti kōrero i te wā tōmua hei kimi i te tūranga pakaru o te taura whakawhitiwhiti kōrero, nō reira e kiia ana hoki ko te "kaitirotiro taura". Ko te reflectometer rohe-wā he taputapu hiko e whakamahi ana i te reflectometer rohe-wā hei tautuhi me te kimi i ngā hapa i roto i ngā taura whakarewa (hei tauira, ngā taura takirua miro, ngā taura coaxial rānei). Ka taea hoki te whakamahi hei kimi i ngā koretake i roto i ngā hononga, ngā papa hiko tā, tetahi atu ara hiko rānei.
Ka taea e te atanga kaiwhakamahi E5071c-tdr te whakaputa mahere kanohi whakatauira me te kore e whakamahi i tētahi atu kaihanga waehere; Mena kei te hiahia koe ki tētahi mahere kanohi wā-tūturu, tāpirihia he kaihanga tohu hei whakaoti i te ine! Kei te E5071C tēnei mahi.
He tirohanga whānui mō te ariā tuku tohu
I ngā tau tata nei, me te tere o te whakapainga o te tere moka o ngā paerewa whakawhitiwhiti mamati, hei tauira, ko te tere moka māmā rawa atu o te kaihoko USB 3.1 i tae ki te 10Gbps; ka eke te USB4 ki te 40Gbps; Mā te whakapainga o te tere moka ka tīmata te puta mai o ngā raruraru kāore anō kia kitea i roto i te pūnaha mamati tuku iho. Ka taea e ngā raruraru pēnei i te whakaata me te ngaronga te whakapōturi i te tohu mamati, ka puta he hapa moka; Hei tāpiri, nā te hekenga o te tawhē wā e whakaaetia ana hei whakarite i te mahi tika o te taputapu, ka tino nui te rerekētanga wā i roto i te ara tohu. Ko te ngaru hikohiko irahiko me te hononga i hangaia e te kaha rereke ka arahi ki te whakawhitiwhiti kōrero ka meinga te taputapu kia mahi he. I te mea ka iti haere, ka piri haere ngā ara iahiko, ka nui ake te raruraru; Hei whakanui ake i te kino, ko te whakaiti i te ngaohiko tuku ka hua ake he iti ake te ōwehenga tohu-ki-haruru, ka nui ake te ngawari o te taputapu ki te haruru;
Ko te taunga poutū o TDR ko te aukati
Ka whāngaihia e te TDR he ngaru hiko mai i te tauranga ki te ara iahiko, engari he aha te wae poutū o te TDR ehara i te ngaohiko engari he ārai? Mena he ārai, he aha koe ka kite ai i te taha e piki ake ana? He aha ngā inenga e mahia ana e te TDR i runga i te Vector Network Analyzer (VNA)?
He taputapu te VNA hei ine i te urupare auau o te wāhanga ine (DUT). I te wā e ine ana, ka whakaurua he tohu whakaoho sinusoidal ki te taputapu ine, kātahi ka whiwhi i ngā hua ine mā te tatau i te ōwehenga whānui vector i waenga i te tohu whakauru me te tohu tuku (S21) te tohu whakaata rānei (S11). Ka taea te whiwhi i ngā āhuatanga urupare auau o te taputapu mā te matawai i te tohu whakauru i roto i te awhe auau ine. Mā te whakamahi i te tātari band pass i roto i te kaiwhiwhi ine ka taea te tango i te haruru me te tohu kāore e hiahiatia mai i ngā hua ine me te whakapai ake i te tika o te ine.
Te hoahoa kauwhata o te tohu tāuru, te tohu whakaata me te tohu tuku
I muri i te tirotiro i ngā raraunga, i kitea e IT i whakatauritea e te taputapu a TDR te kaha o te ngaohiko o te ngaru whakaata, kātahi ka whakatauritea ki te aukati. Ko te tauwehenga whakaata ρ he ōrite ki te ngaohiko whakaata i wehea ki te ngaohiko whakauru; Ka puta te whakaata ina korekore te aukati, ā, ko te ngaohiko whakaata whakamuri he rite ki te rerekētanga i waenga i ngā aukati, ā, ko te ngaohiko whakauru he rite ki te tapeke o ngā aukati. Nō reira, kei a tātou te tātai e whai ake nei. Nā te mea ko te putanga putanga o te taputapu TDR he 50 ohms, Z0=50 ohms, nō reira ka taea te tatau i a Z, arā, ko te pihi aukati o te TDR i whiwhihia mā te kauwhata.
Nō reira, i roto i te pikitia i runga ake nei, ko te aukati i kitea i te wāhanga tuatahi o te tohu he iti iho i te 50 ohms, ā, he pumau te pari i te taha piki, e tohu ana ko te aukati i kitea he rite ki te tawhiti i haerehia i te wā o te horapa whakamua o te tohu. I tēnei wā, kāore te aukati e rerekē. Ki taku whakaaro he porowhita te kī he rite ki te mea i mimitihia te taha piki i muri i te whakaiti i te aukati, ā, i te mutunga ka puhoi. I te ara o muri mai o te aukati iti, ka tīmata ki te whakaatu i ngā āhuatanga o te taha piki, ā, ka piki tonu. Kātahi ka neke atu te aukati i te 50 ohms, nō reira ka paku neke atu te tohu, kātahi ka hoki mārire mai, ā, i te mutunga ka pumau ki te 50 ohms, ā, kua tae te tohu ki te tauranga ke. I te nuinga o te wā, ko te rohe e heke ana te aukati ka taea te whakaaro he kawenga kaha kei runga i te whenua. Ko te rohe e piki ohorere ana te aukati ka taea te whakaaro he inductor kei roto i te raupapa.
Wā tuku: 16 o Ākuhata-2022
