Optical Backscatter Reflectometer 4600 29
User Guide
vertical cursors are on and when the lower graph displays fre-
quency domain data. Data resolution is further discussed under
“Resolution Bandwidth Calculations” on page 177.
• Data Decimation (Upper Graph) > Specify Level allows the user
to select data decimation level, as explained under “Data Decima-
tion” on page 75.
• Display Options controls several display features:
> Auto-Update Lower Graph, when checked, automatically recalculates
the lower graph whenever new data is loaded or scanned, provided the upper
vertical cursors are on.
> Apply Spatial Resolution Filter turns on (checked) and off (unchecked)
the time domain filter. (See “Spatial Resolution Calculations” on page 178.)
> Apply Frequency Domain Window turns on (checked) and off
(unchecked) the Frequency Domain Window. (See “Frequency Domain
Windowing” on page 47.)
> Autoscale Y Axes (Both Graphs) allows the user to turn on (default
setting) and off autoscaling for the Y-axes in both graphs. When this option
is selected, the plot axes automatically scale to include the entire data set
on the Y-axes when a new measurement is performed.
> Autoscale X Axis (Upper Graph) or (Lower Graph) allows the user to
turn on and off autoscaling for the X-axis in the upper or lower graph.
• Cursors > Show Integration Area, when checked (default set-
ting), highlights the data points used to calculate the data for the
lower graph. [In Distributed Sensing Mode (page 48), a purchased
option, this menu item will read Options > Cursors > Show Sens-
ing Area, though it will function the same.] When the Integration
Area (or Sensing Area) is shown, return loss and differential loss
are displayed in the upper right corner of the upper graph.
• Spot Scan:
> Logging Enabled turns on (checked) and off (unchecked) the automatic
saving of data files during Continuous Spot Scanning. The directory and
file prefix are set through the next menu item, Options > Spot Scan > Set
Logging Options.
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