Concepts and features
R&S
®
ZNA
116User Manual 1178.6462.02 ─ 29
2. Frequency-converting: Calculates wait times that are suitable for measurements
on frequency-converting DUTs.
See Chapter 4.7.3, "Frequency conversion measurements", on page 261.
3. Slow: Calculates wait times that are suitable for measurements using external
equipment (e.g. power sensors).
Typically, the algorithm for "mono-frequent"/"slow" measurements results in the short-
est/longest overall wait times. Frequency-converting measurements rely on the relative
power between the ports and hence require higher precision than mono-frequent mea-
surements. So the wait times calculated with this algorithm are typically higher.
But as the wait times also depend on other channel settings, this is not always true.
Automatic vs. manual wait time control
By default, the R&S ZNA automatically selects the appropriate algorithm based on the
channel's measurements. However, you can also pick one of the available algorithms
and observe the effect on the overall measurement speed and precision. Depending
on your channel setup and primary focus (speed vs. precision), selecting another algo-
rithm can be beneficial.
Among other things, the selected wait time control algorithm determines wait times for
the following channel and sweep events:
●
Channel begin (channel initialization)
●
First point of a channel or after a drive port change
●
First point of a segment in a segmented frequency sweep
●
First point of a (power) subsweep in a two-dimensional gain compression sweep
●
Other sweep points
The calculated wait times depend on the selected algorithm and can be point-specific.
In manual mode, you can overwrite them with user-defined (fixed) ones, or enforce
user-defined lower and/or upper limits.
●
Manual settings are particularly useful for applications that require predictable and
stable times between measurement points, e.g. antenna measurements.
●
Manual settings are for experts only. They can significantly degrade the measure-
ment quality and even make the measurement unstable.
See "Evaluation of measurement speed and precision" on page 116.
Evaluation of measurement speed and precision
A timing info field presents speed-related information for the current channel:
Basic concepts
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