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Using an OTDR module
MTS
e
Recommended sequence
The following sequence is recommended:
1.
Make an automatic measurement
2.
add markers using the <Marker> key.
3.
add required manual measurements (<Expert> / <Manual> key)
Attention
If a marker is added using the <Marker> key, after performing man-
ual measurements, then all markers on the trace (
. AUTO and
MANUAL) will be converted to AUTO markers and an automatic
measurement will be made using these manual markers. Previous
slope results will be lost, 2 point measurements will be recalculated.
Whenever the lock markers icon
is displayed, the automatic measurement
following an acquisition is executed using the markers that were present before
the acquisition.
If you only want to make a measurement without markers, press the <Free
Markers> key to deselect the lock markers option.
Overlay trace function
The Overlay Trace allows you to have up to 4 traces on the screen at the same
time. This function is very useful :
•
for comparing traces acquired from several fibers in the same cable,
•
for comparing traces from the same fiber over a period of time or at different
wavelengths.
•
for comparing traces resulting of measurements made in both directions of
the fiber (see "Both End Measurement" on page 5-32)
In order to do this, the instrument is equipped with an overlay memory where
the trace files to be overlaid can be stored. These traces can be:
•
the current trace, for comparison with traces of new acquisitions.
•
traces stored on a floppy disk or internal memory, for comparison with the
current trace.
Overlay conditions
When traces have been set in the overlay memory, if an acquisition is made with
acquisition parameters compatible with the overlay trace (pulsewidth and
range), the acquired trace will remain on the screen to allow the comparison with
the stored traces.
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