人工设置测量、接头损耗的标准数值。通过测试原理，有很大区别。用OTDR进行光纤测量可分为三步：参数设置、数据获取和曲线分析。人工设置测量参数包括：(1)波长选择(λ)：因不同的波长对应不同的光线特性(包括衰减、微弯等)，测试波长一般遵循与系统传输通信波长相对应的原则，即系统开放1550波长，则测试波长为1550nm。(2)脉宽(PulseWidth)：脉宽越长，动态测量范围越大，测量距离更长，但在OTDR曲线波形中产生盲区更大；短脉冲注入光平低，但可减小盲区。脉宽周期通常以ns来表示
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