90 Chapter 6
LightPath Analysis Software Guide
The minimum and maximum values should be set so that all segments of the
Reference Trace pass, and with a wide enough range so that all segments of any
good trace would be expected to pass.
The pull-down menu in the Tolerance
Specification
window graph (Figure 6-8) can
be used to change the display. The Feature Highlight option shows all of the feature
segments.
The High
Resolution
Data option shows the
amplitude
plot for whichever
feature was highlighted in the Feature Listing grid.
Note that no amplitude data is stored for fiber segments. The message No Data to
Display will be shown if a fiber segment is selected with the High Resolution Data
graph active.
Use the pull-down menu to change the graph back to Feature Highlight. The feature
data is shown, scaled to the actual width of that feature. Press the X-axis
autoscale button to show the entire feature graph.
The minimum and maximum values can be set numerically from the Tolerance
Specification
window. The Use +/-
Tolerance
checkboxes
change the Min and Max
value for a particular item (Return Loss, Insertion Loss, or Location) based on
the Target value and a Tolerance value.
Select Feature 6 and click the Use +/- Tolerance checkbox to the left of the Min
Loss (dB) control. The Min Loss (dB) and Max Loss (dB) controls are now disabled
and their values have been changed 2 dB below and above the Loss Target (dB)
value.
The Tolerance (dB) control is now enabled. Change its value to 1.0 and observe
that the Min Loss (dB) and Max Loss (dB) values are changed to be 1.0 dB below
and above the Loss Target (dB) value.
Hint
If you wanted to change the Tolerance ranges for
Loss another Feature to +/- 1.0 from the Loss
Target, simply highlight that Feature in the Feature
Listing while the +/- Tolerance checkbox is still
checked.
Uncheck the Use +/- Tolerance checkbox. The Min Loss (dB) and Max Loss (dB)
controls are now enabled again. The values are still set to 1 dB above and below
the target value, but their values can now be changed if desired.
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