VNA concepts and features
R&S
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ZNL/ZNLE
234User Manual 1178.5966.02 ─ 20
The limit line rules for logarithmic sweeps and segmented frequency sweeps with
point-based x-axis also apply to ripple limit lines (see Chapter 9.4.1.1, "Rules for limit
line definition", on page 230).
9.4.1.3 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.
Operations on traces
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