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人工設(shè)置測量、接頭損耗的標準數(shù)值。通過測試原理，有很大區(qū)別。用OTDR進行光纖測量可分為三步：參數(shù)設(shè)置、數(shù)據(jù)獲取和曲線分析。人工設(shè)置測量參數(shù)包括：(1)波長選擇(λ)：因不同的波長對應不同的光線特性(包括衰減、微彎等)，測試波長一般遵循與系統(tǒng)傳輸通信波長相對應的原則，即系統(tǒng)開放1550波長，則測試波長為1550nm。(2)脈寬(PulseWidth)：脈寬越長，動態(tài)測量范圍越大，測量距離更長，但在OTDR曲線波形中產(chǎn)生盲區(qū)更大；短脈沖注入光平低，但可減小盲區(qū)。脈寬周期通常以ns來表示
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