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Chapter 1 Optical Spectrum Measurement
Result display
Channel detection
threshold
Display of a grid
26
On the trace, some peaks corresponding to noise could be mistaken for
channels. It is therefore necessary to fix a power threshold level: only
peaks that exceed this threshold will be considered as channels and
included in the table of results.
To display or modify this threshold, press the
Signal
threshold. Modify the value to position it on
threshold value.
When set to Auto, the signal threshold is calculated from the actual trace.
The display window of the trace can include a grid to facilitate verification
of the position of the channels. Several grids are possible (see the
chapter
"Parameters of display and analysis of the results" on page
1. The "Auto" value is obtained by continuing to reduce the value of the threshold be-
low the minimum value of -54.9 dBm
MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01
S
key, then select
ETUP
1
Auto
or fix a
14).
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