Optical Backscatter Reflectometer 4600 91
User Guide
The Apply General Tolerances button in the lower left region sets all minimum
and maximum values to match the general tolerances held in the reference trace file.
Press the Apply General Tolerances button and observe that the Min Loss (dB)
and Max Loss (dB) values have returned to their original values. (For details on
view and modifying the General Tolerances of the Reference Trace, see “Editing
a Reference Trace: Processing Parameters and General Tolerances” on page 94.)
Make the two failing features pass by changing the Max Loss (dB) value for Feature
6 to 3.0, and the Max Loss (dB) value for Feature 10 to 7.0. Click Save.
The new tolerance values are written to the files in the golden folder, and the current
trace is reprocessed using these new values. Since the trace data is still the same as
that in the golden Reference Trace, the lower graph should show all features as
passing.
Comparing a New Trace to the Reference
After loading and modifying a Reference Trace, you would generally proceed to
scanning data, which would automatically be compared to the Reference Trace. But
for this tutorial, we will load another *.obr file similar to the one used above to create
the Reference Trace.
Select File > Load Data File from the menu; browse and open the file device2.obr,
located in C:\Documents and Settings\All Users\Application Data\Luna
Technologies\LightPath Analysis v#.#. The new trace should be similar to the first,
but may differ slightly. If you set the Loss tolerances as directed above, all the
features should be marked as passing.
Viewing Segment Details
Press the Compare button to view the Trace Comparison window (Figure 6-10).
Note that because you have loaded a Reference Trace Event Listing now contains
data. (Earlier in the tutorial we were comparing to a Parameter
Configuration
File,
so this grid was empty.) The Reference Trace File Folder field in the upper left
shows the current Reference Trace (C:\LPA_Data\golden).
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