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Chapter 3 Reflectometry measurements
Advanced functions in Expert OTDR mode
1
Select a cursor (A or B).
2
Use the direction keys or touchscreen to move the cursor to the place where you
want to position a marker.
3
Press the keys: Advanced >
4
An event marker
is carried out on the event.
Measurement of slope before the marker starts just after the previous event (or at
the end of the dead zone at the beginning of the fiber); measurement of slope
after the marker stops just before the next marker or at the end of the fiber.
Hints on the positioning of events
•
Do not add markers (with the
the results will be recalculated automatically by the instrument.
•
If two markers are too close together, they will appear on the trace and the table
but no measurement will be carried out on the second marker: to obtain results
for this marker, a manual measurement is necessary.
•
If you press the
latter will be deleted.
Deleting events
To delete an event, move the cursor onto the event and press the
event selected will be deleted and a complete measurement, without this event, is
carried out.
Deletion of events can cause incorrect measurement results.
Relative measurement
Relative measurements, using the 2 point method, can be carried out by means of the
Event function in coordination with the two cursors. For example, you can analyze the
total loss on a link with launch cable:
1
Place one of the cursors at the end of the launch cable.
2
Select the other cursor.
3
Use the Set Event function. The measurements displayed give the actual
distance from the start of the link and the attenuation of the link plus the attenua-
tion of the connection.
86
Set
is displayed at the position of the cursor and a measurement
Set Event
Set Event
key when the cursor is very close to a marker, the
User Manual
Event.
key) after a manual measurement, as all
78000010220 Rev. 024
Set Event
key. The
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Troubleshooting
