【简答题】
光时域反射仪测量光缆全程衰耗值
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答案
工具器材准备
OTDR、2km以上假纤（两端已连接尾纤）、无水乙醇及药棉
具体要求:测试出全程衰耗值并记录。
操作时限：10分
评分标准：
1.未准备无水乙醇和药棉等清洁工具扣10分。
2.连接尾纤时未清洁尾纤端面的扣10分，尾纤为拧紧的扣2分。
3.光纤折射率设置不正确扣10分，测试模式选择不正确扣10分。
4.长度计算未在OTDR显示的曲线上，精确调整游标A、B的位置，并进行读数的扣5分（要求：A在漫反射的末端，B在终点反射的起始处）。
5.使用事件表直接读取长度按照第4条扣分。
6.读取衰耗值不对或误差较大此测试失败，本次考核不通过。
7.在规定时间内完成，每超时30s扣5分，超时2分钟停止操作，本次考核不通过。
解析
暂无解析
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【判断题】
纤芯（core），折射率较高，用来传送光,包层（coating），折射率较低，与纤芯一起形成全反射条件；保护套（jacket），强度大，能承受较大冲击，保护光纤。
A. 对
B. 错
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