Optical Backscatter Reflectometer 4600 47
User Guide
To perform extended range spot-scan measurements
1 Perform the first four steps of the single Spot Scan measurement (see
“To perform a single spot-scan measurement” on page 45). Select
Options > Distance Range > Extended (A check mark in the menu
indicates that Extended Range is On or Enabled). As mentioned
earlier, Extended Mode is not available unless purchased as an option.
2 In Extended Range mode, a standard extended range scan must be
performed prior to performing any extended range spot scans. See the
instructions
on
performing
a standard extended range scans (see “Single-
Scan Mode” on page 41 which includes Extended Range scan
instructions).
3 In Extended Range mode, the Wavelength Range can be increased
from the minimum available when performing spot scans in order to
achieve higher resolution measurements. If the wavelength range
selected is greater than the minimum available, the Scan button is
disabled, allowing the user to only perform spot scans until the
wavelength range is reduced.
4 Click the Spot Scan button in the System Control area. Click the Spot
Scan button to start continuous scanning. This button will turn gray
during continuous scanning. The resulting Spot Scan will be displayed
in Trace A in the upper graph area. If continuous scanning was selected
then the Continuous Spot Scans will appear in the lower graph.
Frequency Domain Windowing
The OBR software provides the option to apply a
Hanning
window to the frequency
domain data for new scans. The window is only applied to new data as it is scanned
and will not affect data already loaded into other traces. Saved binary files retain
this windowing.
The frequency domain window setting is toggled on (checked) and off by using the
menu selection Options > Display Options > Apply Frequency Domain Window.
The Measurement Details dialog box (Figure 5-2 on page 61) shows whether or
not the Frequency Domain Window was applied to the data.
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