Optical Backscatter Reflectometer 4600 73
User Guide
Vertical cursors:
Clicking this button toggles two vertical cursors on or off. Note that when these
cursors are on, the data points integrated to calculate return loss and differential loss
are highlighted in contrasting colors, and the results are displayed in the upper right
legend. This
highlighted
region may be turned off by
unchecking
Options > Cursors
> Show Integration Area. [Or, in optional Sensing Mode (page 48), Options >
Cursors > Show Sensing Area.] This highlighted or integrated region determines
the X-axis of the lower graph.
The number of points integrated may be increased (or decreased) by entering a larger
(or smaller) number in the Integration Width field in the Data Processing area of
the main window. [In Sensing Mode, the width of the integration area is controlled
by the Sensing Range field in the Data Processing area.]
For an explanation of how differential loss is calculated, see “Return Loss and
Differential Loss” on page 178.
As mentioned above, select the cross-hair tool to move cursors.
Horizontal cursors:
Clicking this button toggles two horizontal cursors on or off.
Twin locked cursors:
Clicking this button toggles twin locked cursors on and off. Regardless of where
these cursors are dragged, they will intersect the graph at a data point on the first
trace displayed. So to use twin locked cursors on Trace C, for example, deselect
Traces A and B in the checkboxes in the Data Management area.
Bring cursors to center:
Clicking this button brings the active cursors into the viewed portion of the graph.
Move cursors to peak:
Clicking this button moves the two vertical cursors to the peaks of the regions
highlighted by each cursor. Simply click on this button when the vertical cursors
are on.
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