Concepts and Features
R&S
®
ZNB/ZNBT
137User Manual 1173.9163.02 ─ 55
The limit line rules for logarithmic sweeps and segmented frequency sweeps with
point-based x-axis also apply to ripple limit lines (see Chapter 5.4.1.1, "Rules for Limit
Line Definition", on page 133).
5.4.1.3 Circle Limits
A circle limit is a special type of upper limit line which is defined by its center coordi-
nate in the diagram and its radius. Depending on the diagram type, circle limit can
serve different purposes:
●
With a circle limit line centered on the origin of a polar diagram, you can check
whether the magnitude of the measurement results exceeds a limit, defined by the
radius of the limit line.
●
With a circle limit line adjusted to the right border of a Smith diagram (Z = infinity),
you can check whether the imaginary part of the impedance (Im(Z), reactance) falls
below a limit.
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