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OTR 700 User's Guide Rev02 11/2016
8.12 Event Analysis
NOTE:
When using the event table and ODM's OTR 700 Schematic view, it is necessary to keep in mind that
event analysis provides approximate loss and distance measurements to quickly assist in network
evaluation. Automatic detection results are not guaranteed and have their limits, possibly causing
erroneous readings or detection failure. User interaction, by interfacing with the trace display is
recommended for final qualitative and quantitative analysis.
Enter Event Analysis
To enter event analysis, press the menu button and use the left / right buttons to highlight the event analysis
icon and press select.
Chapter 8 OTDR Operation
Threshold Settings
There are five threshold settings, ORL, Loss, Reflectance (Refl.) Link and End OF FIber (EOF). (See Fig 8.4)
The EOF is not a Pass/Fail threshold, it is used to set a loss value to determine the end of fiber. IF the EOF
threshold is set for 3dB, then the first event that has a loss of 3dB or greater will be determined to be the EOF.
To change the threshold settings, press the Menu button, use the left/right buttons to highlight the settings icon
and press select. Use the down button to move the cursor to the threshold setting to be set.
When the threshold value is selected with the yellow background, press Select to highlight the first digit in the
setting. Use the up or down buttons to make a change and the left or right buttons to move to the previous or
next digit. When the value is set as desired, press the Select button and use the directional buttons to move to
the next threshold to be set. To exit the parameter screen, press the menu button.
Examples of these settings are as follows:
Splice:
If a 1.00dB splice loss is acceptable, set the threshold to 1.00. If a splice loss of 1.00 is the fail
point, set the threshold to 0.99
ORL:
If a -50dB reflectance is acceptable, set the threshold to 50. If -50dB is the fail point, set the
threshold to 50.5.
Link:
If a 20dB, link loss is acceptable, set the threshold to 20. If 20db link loss is the fail point, set
the threshold to 19.5.
Touch Screen Tip
With the touchscreen, touch the arrows above or below any digit to make changes.
NOTE:
The cursor will be displayed as yellow when not on a selected value and green when on a value that is
already a selected parameter..
NOTE:
Thresholds are "pass thresholds", a value entered as a threshold is a passing value.
