Viavi COSA-4055 User Manual page 30

Chapter 1 Optical Spectrum Measurement
Result display
Adjusting the
y axis
Displaying the
difference of two
curves
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To compare curves the y axis of the curves can be adjusted by the
Y Reset/Y Shift/Y Exact softkey.
 Press the softkex to select one of he following settings:
– Y Reset: All traces are on the the same level at the intersection
with the active cursor.
– Y Shift: Each trace is shifted 5 dB from the other.
– Y Exact: The traces displayed are on the same position
according to their injection level.
A difference can be build from two curves.
1. Display the two curves.
2. Press the Advanced softkey, select Overlay and then
2 Curves Diff.
The difference curve is displayed as a new trace in the diagramm.
Fig. 15 Difference of two curves (1)
MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01
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