Exfo OTDR 2 User Manual download pdf (Page 130)

Analyzing Traces and Events

122 OTDR

Viewing and Modifying Current Measurement Settings

5. If you want to modify the parameters, enter the desired values for the

current trace in the appropriate boxes.

If you want to revert all settings to their default values, tap the Revert to

Factory Settings button.

Note: The modifications you make will only be applied to the selected

wavelength, except for the detection thresholds.

Note: You cannot define a different helix factor for each wavelength. This value

takes into account the difference between the length of the cable and the

length of the fiber inside the cable; it does not vary with wavelengths.

 Unless you are absolutely sure of the different parameter values, revert

to default values to avoid fiber setting mismatches.

 If you already know the IOR value, you can enter it in the

corresponding box. However, if you prefer to let the application

calculate the IOR value as a function of the known distance between

span start and span end, tap Set IOR by Distance, then enter the

distance value.

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Exfo OTDR 2 User Manual Page 130