Concepts and Features
R&S
®
ZNA
121
User Manual 1178.6462.02 ─ 12
When the sweep axis is changed from linear frequency sweep to logarithmic sweeps,
straight limit lines are transformed into exponential curves. The sweep points are redis-
tributed along the x-axis, so the number of failed points can change.
Logarithmic interpolation
The analyzer offers a logarithmic interpolation mode that allows you to carry over the
limit line definition to logarithmic sweeps.
While "Show Limit Line" is active, the diagrams display all limit line segments.
Exception:
In a segmented frequency sweep with point-based x-axis, gaps between
the segments are minimized. To facilitate the interpretation, the R&S
ZNA displays only
the limit line segments which provide the limit check criterion (the "tighter" limit line at
each point). In the example below, this rule results in a single, continuous lower limit
line.
Operations on Traces
