HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

SENTERT Segment Entry for Sweep Time Limit Lines
Note If the current limit line table contains lines based on frequency (as opposed to a
limit line based on the sweep time), executing SENTERT will clear the current
frequency limit line table.
The three segment types are FLAT, SLOPE, and POINT.
� 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
sweep 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.
� 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 sweep times between
the two points.
� POINT specifies a limit value for the coordinate point, and no other sweep time points, so
that a POINT segment specifies a limit value for a single sweep time. 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 sweep time than the current sweep time of
the spectrum analyzer.
Segments are sorted as they are entered according to starting sweep time. A maximum of 20
segments can be defined using SENTERT.
5480 Programming Commands