Concepts and features
R&S
®
ZNA
117User Manual 1178.6462.02 ─ 29
Table 4-2: Timing info
"Ch<no>" The channel ID
"Wait Time" The total wait time in the measurement
"Measurement Time" The total time for the measurement, including the wait time
"First Point Wait Time" The wait time before the first point
"Sweep Retrace Time" The time between the completion of the measurement and the start of the next
measurement. During this time, the HW is idle and the FW finalizes the compu-
tation of the last sweep.
"Sweep Cycle Time" Sum of measurement time and sweep retrace time
"Avg Sweep Cycle Time" The average of the sweep cycle times since "Show Sweep Timing" is active.
"Max Sweep Cycle Time" The maximum of the sweep cycle times since "Show Sweep Timing" is active.
"Min Sweep Cycle Time" The minimum of the sweep cycle times since "Show Sweep Timing" is active.
"Busy Time" Sum of the sweep cycle times of all channels since "Show Sweep Timing" is
active for at least one channel
To evaluate the measurement precision, proceed as follows:
1. Use automatic wait time control to create memory traces of your measurement
results.
2. Compare these memory traces to traces obtained with alternative wait time control
4.1.5 Automatic level control
Automatic level control (ALC) keeps the level of generated waves (source level) at a
constant value, irrespective of the DUT's input impedance. The measurement speed is
slightly reduced.
Control loop parameters
The analyzer uses a proportional-integral (PI) controller as a feedback controller for
ALC. PI controllers provide two control parameters:
●
The proportional gain K
r
controls the change of the controller output in response to
the current error value. If the value is too high, the ALC can become unstable. If it
is too low, the ALC possibly does not respond sufficiently to errors and become too
slow.
Basic concepts
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