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U
SER
M
ANUAL
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Optical spectrum analyser
MTS
e
•
during the following acquisitions, the detected channels or «current
channels» are not necessarily the same as the channels found with the first
acquisition.
To choose the channels to be displayed, use the <Current Channels> / <Found
channels> key.
Displaying in red the results exceeding alarm thresholds
To display in red in the table the results exceeding the alarm thresholds that have
been chosen in the OSA test setup menu, proceed as follows:
•
Press the <Cont Tab> key, then the <Current channels> / <Found channels>
key until <Alarm channels> is displayed.
Overlay of traces
This Overlay Trace function which allows two traces to be displayed
simultaneously on the screen is very useful to compare either the acquired
spectrums from different fibers of the same cable, or to know how the spectrums
from the same fiber evolve over time.
For this, the instrument has an overlay memory in which the trace to be
superimposed on the current trace must be stored. This memory can be used to
store either:
•
the current trace to compare it with traces which will be acquired in the
future.
•
a reference trace previously saved on a floppy disk or in internal memory, to
compare it with the current trace.
Overlaying a trace
Overlaying the current trace
To copy the current trace in overlay memory, do as follows:
•
On the trace display screen, obtained by pressing the
RESULTS
key, press the
<Expert> key, then the <Overlay>, and finally the <Set overlay> key.
The current trace copied in overlay memory is represented by a pale line (or,
with a colored screen, in blue) which is automatically offset with respect to
the current trace.
•
a new acquisition can then be started to compare the new trace with the one
being overlaid.
Transferring a stored trace to the overlay memory
1.
Select the trace to be put in the overlay memory by using the procedure
described in "Finding files" on page 8-18.
2.
Press the <Load> key, then the <Overlay> key.
The selected trace is then put in the overlay memory: it is represented by a
pale (or blue) line and is automatically offset with respect to the current trace.
It can be compared with the current trace.
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