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Using Spectrum Analyzer Features
Using limit-line Functions
l The upper and lower limit-line table format is accessed by Edit Up/Low
With the upper and lower limit-line table format, the upper and lower
limit-line coordinates can be entered at the same time: the frequency
(or time), upper amplitude, lower amplitude, and type are specified. The
frequency (or time) and upper amplitude comprise the coordinate point for
the upper limit line; the frequency (or time) and lower amplitude value
comprise the coordinate point for the lower limit line. It is not necessary to
specify both an upper- and lower-amplitude component for every frequency
component. Three asterisks in the table indicate that an amplitude value
has not been entered for the segment.
l The mid/delta limit-line table format is accessed by Edit
Mid/D&t
. Like
the upper and lower limit-line table format, the mid/delta limit-line table
format provides a means of specifying the upper and lower limit lines at
the same time. Unlike the upper and lower table format, the amplitude
values are specified as a middle amplitude value with a delta: the upper
and lower limit lines are then drawn at an equal positive and negative
distance from the middle amplitude. With the mid/delta format, the
frequency (or time) and the mid-amplitude plus the delta comprise the
upper limit line; the frequency (or time) and the mid-amplitude minus the
delta comprise the lower limit line. The difference between the mid/delta
format and the upper/lower format is the way the amplitude values are
entered; however, in both formats, the frequency coordinate begins a
segment. The mid/delta format can be used if the upper and lower limit
lines are symmetrical with respect to the amplitude axis.
NOTE
Editing a limit line table can be done using a different format than the one that was used for creating
it.
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