Splice Measurements - Viavi E4123MM User Manual

Chapter 3 Expert OTDR function
Advanced functions
Figure 45 Reflectance measurement

Splice measurements

There are two methods of carrying out manual measurements of splices on the trace:
the two-cursor method and the five-cursor method.
The five-cursor method is the more accurate, as it takes into account the difference of
level between the slope before the splice and the slope after the splice. This method
should be used whenever possible.
If very close events have created a dead zone preventing the measurement of slope by
the five-cursor method, it is possible to use the two-cursor method. This considers the
difference in level between the cursors.
Before performing one of these measurements, define in the Setup menu the splice
detection threshold.
Two points method
To perform a splice measurement by the "two-points" method, display the
then:
1 Place cursor A exactly on the fault, then place cursor B after the splice that you
wish to define.
2 Press the
3 Select the function
4 Press Calculate key.
68
Analysis key, then click on Loss.
2 Pt Loss.
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