Results of the calibration of Optical Time Domain Reflectometers (OTDR) according to IEC-proposals will be presented. The linearisation of the power scale was performed by the ''Power reduction method-long fiber alternative (PRM-LFA)'' and the ''Loss calibration with fiber standard''. The test procedures as well as the correction of the displayed OTDR attenuation value are described, It will be shown that the PRM-LFA is the superior technique with respect to performance and accuracy, After calibration and linearisation the uncertainty of the attenuation coefficient can be reduced down to 0.002 dB/km. [References: 5]
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机译：将介绍根据IEC提案的光时域反射仪（OTDR）的校准结果。功率刻度的线性化是通过“功率降低方法-长光纤替代（PRM-LFA）”和“光纤标准损耗校准”来进行的。描述了测试程序以及显示的OTDR衰减值的校正，结果表明PRM-LFA在性能和准确性方面是上乘的技术，经过校准和线性化后，可以降低衰减系数的不确定性低至0.002 dB / km。 [参考：5]
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