R&S ZNB Series User Manual page 148

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R&S ZNB/ZNBT
The limit line rules for logarithmic sweeps and segmented frequency sweeps with
point-based x-axis also apply to ripple limit lines (see
line definition",
4.4.1.3 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.
User Manual 1173.9163.02 ─ 62
on page 145).
Concepts and features
Operations on traces
Chapter 4.4.1.1, "Rules for limit
148