目 录
1 范围····························································，·····························…… (1)
2 术语··························································································…… (1)
3 概述··························································································…… (2)
4 计量性能要求··············································································…… (3)
4.1 输出光中心波长······································································…… (3)
4.2 距离测量扩展不确定度·······························································…… (3)
4.3 损耗测量扩展不确定度·······························································…… (3)
4.4 位置偏差·················································································…… (3)
4.5 动 态范围·················································································…… (3)
4.6
“衰减盲区”长度 (3)
4.7 “事件盲区”长度 (3)
5 通用技术要求··············································································…… (3)
5.1 标志·······················································································…… (3)
5.2 技术资料···························。·····················································…… (3)
5.3 外观·······················································································…… (4)
5.4 功能键····················································································…… (4)
6 计量器具控制···································································……‘’‘’‘’‘’.‘’(4)
6.1 首次检定和后续检定·······················································……‘·‘.“““(4)
6.2 检定条件·················································································…… (4)
6.3 检定项目和检定方法··················································……‘·‘”““““‘”(5)
6.4 检定结果的处理·。··········································……”””””””””“’“’““(16)
6.5 检定周期。......................................................................................(16)
光时域反射计检定规程
范 围
本规程适用于光时域反射计 (OTDR)的首次检定和后续检定。
2 术语
2.1 中心波长 (x中心)
用nm表示的光源加权平均真空波长。
对连续光谱，中心波长定义为
(1)
对分离 光谱
习P:'l;
*中J。一}'Pi
(2)
式中:几— 光源的谱功率密度;
A;— 分立波长;
尸— 波长为A，激光模的功率。
2.2 参考距离 (D,er )
借助于准确度比〔)TDR高的计量标准或测量仪器确定的光纤特征点之间的距离 (m).
2.3 距离标尺系数 (SL)
OTDR平均显示距离除以相应的参考距离
( D.a,)
SL (3)
Drer
式中:D,,,, OTDR测量参考距离的显示平均值。
2.4 参考位置 (L -f)
借助于准确度比OTDR高的计量标准或测量仪器确定的OTDR前面板到光纤一个
特征点之间的距离 (m) a
2.5 位置偏差△Lo
OTDR测量参考位置特征点的显示值减去参考位置 (m)(近似等于OTDR输出接
头在OTDR距离标尺的显示位置。对一个理想的OTDR，此项应为零)。
