4
3. Keypad
5.Operations
1. Starting up, when clean the end face of fiber, connect the interface of OTDR, make the fiber and
instrument correctly connect
2. Press ENT setting parameter; pulse width choose auto. Continuous press ENT confirm and Exit parameter
setting or continuous press◄exit ; Press SCAN start to test and get the results. The theoretical value of
refractive index is 1.4677 at 1550nm. The pulse width is set according to the length of the measuring
fiber. Small the pulse width, short the measurement distance, if cannot confirm the fiber length，can
use 100ns,then choose the pulse width according to the measurement result curve; if short distance can
choose<500m, if long distance choose<40km.
The greater the gain, the stronger the signal that can be measured.
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