VeEX FX150, Руководство пользователя

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OTDR Series e-Manual, RevE00 Page 98 of 128
8.2.5 Splice Loss Measurement
Determines the Splice Loss in the optical fiber connection using the five markers method.
Splice Loss using 5-Point LSA method
To view the Splice Loss:
1. Select trace for measurement (if multiple traces are displayed on screen). The trace to be
measured can be selected using the green arrow in the trace overview window.
2. Select
Splice (Spl)
from drop-down list.
3. Expand or zoom the trace horizontally and vertically (using Zoom Controls) and position
event in the middle of the screen using the scroll function. Always ensure that a part of the
trace is visible on either side of the event so you can place markers properly.
4. Position center marker on the event’s rising or falling edge. You can use the rubber keypad
to place the marker exactly, if needed.
5. Position the first two LSA interval indicators on a linear section of backscatter preceding the
event and position the last two LSA indicators after the event, ensuring that only pre/post
backscatter is used to make the measurement. The entire event including transition should
not be included in either LSA intervals.
All four LSA interval indicators can be positioned independently in relation to the
center Marker. When the center Marker is moved, the intervals will move
simultaneously to maintain relative position.
The sections between the first two markers and the last two markers are approximated by
straight lines (LSA). The value of event loss is defined by the position of the center marker.