Viavi 8100 V2 Series User Manual page 130

Chapter 3 Reflectometry measurements
Advanced functions in Expert OTDR mode
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 validation key
The splice marker is placed at the point defined by the first (left-hand) cursor and
the result is displayed on the screen. If the fault is reflective, the reflectance value
is also measured and displayed. These results are added to the table of results.
NOTE
If you try to measure a splice on a slope, the measurement is not carried out
and the following error message is displayed: "Slope found between
two cursors".
Five points method
To carry out a splice measurement by the "five points" method:
1 Measure the slope preceding the fault to be measured, then the slope following it.
2 Place the cursor on the fault (between the two sections).
3 Press the
4 Press Modify Meas. key, then
5 Select
6 Press validation key
The splice event marker is placed on the cursor and the result is displayed on the
trace and in the table of results.
94
Advanced key, then Modify Meas. >
2 Pt Loss.
Advanced key
5 Pt Loss.
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