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                                                                                                                                                                                                              文章詳情

                                                                                                                                                                                                              福祿克DSX-8000/5000電阻測試過程中都有哪些結果呈現

                                                                                                                                                                                                              日期:2022-05-27 00:14
                                                                                                                                                                                                              瀏覽次數:33
                                                                                                                                                                                                              摘要:直流電阻不平衡測試可以驗證線對中的導線是否有相同的電阻,從而提供所需的共模電流以有效地支持PoE并避免同一雙線對上傳輸的數據信號發生失真。
                                                                                                                                                                                                              在福祿克DSX-8000與福祿克DSX-5000測試儀中,電阻這一項點擊進去會有不同的結果顯示,那么他們都是什么意思呢?今天維信儀器儀表的工程師們就給大家解決這一困惑。

                                                                                                                                                                                                              LOOP=直流環路電阻

                                                                                                                                                                                                              PAIR UBL=線對電阻差

                                                                                                                                                                                                              P2P UBL=線對電阻差的差

                                                                                                                                                                                                              IEEE標準802.3-2012規定導線之間的直流電阻(LOOP)不平衡高為3%,這意味著兩根導線之間的直流電阻差不能超過一根雙絞線總直流環路電阻的3%。但是TIA和IEC標準都不要求將線對內的直流電阻不平衡或線對之間的直流電阻不平衡作為現場測量。沒有現場測試要求因為沒有能夠測試直流電阻不平衡的現場測試儀,于是這成了僅實驗室可以執行的測量。但有了DSX-5000 CableAnalyzer情況就不同了。此外,IEEE802.3bt標準要求兩個線對之間的直流電阻不平衡不超過7%或50m。

                                                                                                                                                                                                              直流電阻不平衡測試可以驗證線對中的導線是否有相同的電阻,從而提供所需的共模電流以有效地支持PoE并避免同一雙線對上傳輸的數據信號發生失真。與僅測試直流環路電阻的其他現場測試儀不同,DSX-5000月DSX-8000可測量直流環路電阻、線對內的直流電阻不平衡、線對之間的直流電阻不平衡。
                                                                                                                                                                                                              另外如下面的圖所示,DSX-5000和DSX-8000測量的直流環路電阻是一根雙絞線中的兩根導線的電阻和,而直流電阻不平衡測量的是兩根導線的電阻差。線對1,2-4,5的線對之間直流電阻不平衡如下圖所示,圖中是兩線對的并聯電阻差。
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