5-22
U
SER
M
ANUAL
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Using an OTDR module
MTS
e
Adding markers
To add event markers:
1.
Select a cursor.
2.
Use the positioning arrows to move the cursor to the position where you
want to add a marker.
3.
Press the <Marker> key.
4.
An event marker is displayed at the cursor location and a full measurement is
immediately performed. The slope before the marker will start just after the
previous marker (or the front end dead zone), and the slope after the marker
will end just before the next marker or the end of fiber.
Warning about markers
Note
Do not add markers (with the marker key) after manual measure-
ments, because this will convert automatically all the manual mea-
surements.
Note
If two markers are too close, they appear on the trace and on the
table but no measurement is made for the second marker. In this case
a manual measurement is necessary to have results for both markers.
Note
There are two sets of markers: one for 1550 nm, the other for 1310
nm. Markers defined for 1550 nm will not be used at 1310 nm and
vice versa.
Important
If the
<
Marker
>
key is pressed when the cursor is very close to an
existing marker, this marker will be deleted.
Deleting markers
To delete a marker, position the cursor on the marker and press the
<
Marker
>
key. The selected marker is deleted and a full measurement without the marker is
immediately performed.
To delete several successive markers, use the
<
Event
>
key to go to the first
marker and press the
<
Marker
>
key as many times as necessary to delete the
markers. The cursor will be positioned automatically on successive markers.
Deleting markers may lead to incorrect measurements.
Addition of manual measurements
Once you have made an acquisition with or without an automatic measurement
you can add manual measurements of any events on the trace using the cursors
in conjunction with the splice, slope and ORL functions. Whenever manual
measurements are made, it is recommended to set to
ALL
the result thresholds
,
and to activate the
Results on trace
option in the
OTDR Test Setup
window.
The manual measurements are controlled with the <Manual
>
key accessible
from the
Results
page, after pressing the <Expert> key.
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