测试机设置距离0KM-10KM波长155013101550131015501310155013101550131015501310脉宽10ns-100ns平均化10折射率1.4661001.4655001.4661001.4655001.4661001.4655001.4661001.4655001.4661001.4655001.4661001.465500背向散射电平随脉宽的变化而变化（脉宽越高电平越高反之越低）背向散射电平10KM-25KM10ns-1000ns1525KM-50KM10ns-4000ns2050KM-100KM10ns-20000ns25100KM-200KM10ns-20000ns30200KM-400KM10ns-20000ns30快速距离1KM2.5KM5KM10KM25KM50KM100KM200KM250KM400KM采样点0.2M0.5M1M2M5M10M20M40M40M80M距离1KM2.5KM5KM10KM25KM50KM100KM200KM250KM400KM采样点普通采样点0.05M0.1M0.2M0.5M1M2M5M10M10M20M距离1KM2.5KM5KM10KM25KM50KM100KM200KM250KM400KM高精度采样点0.05M0.1M0.2M0.5M1M2M5M10M10M20M备注：采样点越密测试越精确置接续损耗回损光纤远端每公里损耗0.2db0.3db≤+0.3db20.0db-60.0db(一般设置为25.0db)1.0db-99db(一般设置5.0db)
