Chapter 5
Launching a reflectometry test and displaying results
Advanced functions in OTDR Expert mode
User Manual
770000102/08
59
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 measure-
ment 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
Results
page, then:
1
Place cursor A exactly on the fault, then place cursor B after the
splice that you wish to define.
2
Press the
Advanced
key, then
Manual Measurement
, then select
the function
2 Pt Loss
.
3
Press validation key (
or
E
NTER
).
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
.
Fig. 34
Reflectance measurement
MTS2100 4100 Module US rev08.book Page 59 Jeudi, 1. août 2013 1:43 13