VNA concepts and features
R&S
®
ZNL/ZNLE
234
User Manual 1178.5966.02 ─ 19
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
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
