Changing The Traces Position; Trace Resulting From The Difference Between Two Traces; Removing A Trace In Overlay - Viavi 8100 V2 Series User Manual

Chapter 12 High Resolution OSA Measurement
Overlay trace function

Changing the traces position

Once a trace is displayed in overlay, the traces can be adjusted according to the Y axis:
1 Press Advanced > Overlay menu keys.
2 Select the adjustment according to Y axis:
Y Reset: all traces are on the the same level at the intersection with the active
cursor.
Y Shift: Each trace is shifted from 5 dB from the other.
Y Exact: the traces displayed are on the same position according to their injec-
tion level.
Trace resulting from the difference between two
traces
It is possible to obtain the trace corresponding to the point-by-point difference between
the current trace and the trace in overlay (if only two traces are displayed simultane-
ously).
To do this:
1 Press Advanced > Overlay menu keys
2 Press the
The screen displays the two traces in overlay and the trace resulting from the
"Difference".

Removing a trace in overlay

Removing the current trace
It is possible to remove a trace displayed. To do this:
1 Select it (see previous paragraph),
2 In Results page, press Advanced > Overlay menu keys
3 Press
398
2 Curves Diff.
Remove Current Trace.
User Manual
menu key.
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