What are the main factors for the existence of OTDR test errors?admin
First: test instrument operation improper error
In the cable fault location test, the correctness of the OTDR instrument is directly related to the accuracy of the obstacle test, the instrument parameter setting and accuracy, the improper selection of the instrument range or the setting of the cursor will lead to the error of the test result.
Second: OTDR test instrument exists inherent deviation
By the OTDR test principle, it is a certain period of time to send light to the measured fiber pulse, and then at a certain rate will be from the fiber backscatter signal sampling, quantization, coding, storage and display. OTDR instrument itself due to the sampling interval and there is an error, this inherent deviation is mainly reflected in the distance resolution. The OTDR’s distance resolution is proportional to the sampling frequency.