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Using Spectrum Analyzer Features
Using limit-line Functions
Selecting the Segment
be
Press SEGMENT TYPE , then FLAT, SLOPE, or POINT to specify the segment
type. The segment type determines how to connect the coordinate point of
the current line segment with the coordinate point of the next line segment.
The segment type determines whether the line segment is horizontal,
vertical, sloped, or a single point. The three segment types are:
1. Flat draws a zero-slope line between the coordinate point of the current
segment and
the.coordinate
point of the next segment, producing limit-line
values equal in amplitude for all frequencies or times between the two
points. If the amplitude values of the two segments differ, the limit-line
will “step” to the value of the second segment. See Figure 3-7.
2. Slope draws a straight line between the coordinate point of the current
segment and the coordinate point of the next segment, producing limit-line
values for all frequencies between the two points.
3. Point specifies a limit value for the coordinate point. It specifies a limit at
a single frequency or time, and for no other frequency/time points. For
an upper limit line, a point segment is indicated by a line drawn from
the coordinate point, vertically off the top of screen. For a lower limit
line, a point segment is indicated by a line drawn from the coordinate
point, vertically off the bottom of screen. The point segment type should
be used as the last segment in the limit-line table. However, if the last
segment in the table is not specified as the point segment type, an implicit
point is automatically used. (If a visible point segment at the right-hand
edge of the display is not desired, add an explicit last point segment to the
limit-line table that is higher in frequency than the stop frequency.)
Figure 3-7 demonstrates the different segment types.
3-46