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ANUAL
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Using an OTDR module
MTS
e
If no result is displayed
If no result is displayed this can be due to:
•
the display slope measurement result threshold is higher than the slope you
are trying to measure,
•
the Slope Threshold option in the
OTDR Test Setup
menu, is set to NO slope
display.
•
the distance between A and B is too short.
To delete a slope measurement
To delete an individual slope measurement result, superpose the A and B cursors
on the concerned slope and press the
<
Slope
>
key.
Making splice and reflectance measurements
There are two methods of making manual splice measurements on the trace: the
two cursor method and the five cursor method.
The five cursor method is the most accurate, because it takes into account the
difference in level between the slope before the splice and the slope after the
splice. It is recommended to always use this method if possible.
If a slope measurement cannot be made, due to very close events where the dead
zone does not permit a slope measurement, the two cursor method should be
used. The two cursor method takes into account the difference in levels between
the cursors.
Before making either type of measurement, set the display splice and slope
measurement result thresholds you require with the
Splice Threshold
and
Slope
Threshold
options (
All
is recommended) in the
OTDR Test Setup
window. You
should also enable the
Results on trace
option.
Two cursor method
To make a two cursor splice measurement, press the <
Result
> key:
1.
Position cursor A exactly at the position of the fault and the cursor B after the
splice you want to define. Select the A/B cursor.
2.
Successively press the <Expert>, then <Manual>, then <Splice> keys.
The splice event marker is positioned at the point defined by the first (left)
cursor and the result is displayed on the screen. If the event is reflective, the
reflectance value is also measured and displayed. These results are also
shown in the event result table.
Important
To perform a two cursor splice measurement always use the cursor
A/B.
If no result is displayed this is due to: the display splice measurement result
threshold being higher than the splice you are trying to measure, the threshold is
set to
NO
splice display, or the Results on trace function being disabled.
Important
If you try to measure a splice on a slope, the measurement is not car-
ried out and the “slope found in region between two cursors” error
message is displayed.
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