Concepts and features
R&S
®
ZNA
119User Manual 1178.6462.02 ─ 29
ALC deembedding
This feature allows the ALC to consider the configured offset or single-ended deem-
bedding network. The target power then refers to the DUT port instead of the calibra-
tion plane.
ALC with mmWave converters
Loop tuning is particularly beneficial for frequency converters R&S ZC500,
R&S ZC750, and R&S ZC1100.
To use ALC with mm-wave converters, suitable leveling data is required. The leveling
data must use a step size of 1 dB, which can be enforced with the ALC Step Size set-
ting.
4.1.6 Power correction from pre-measurement
The "power correction from pre-measurement" feature is an alternative to ALC. It uses
power values measured in the previous sweep or in several dedicated correction
sweeps to adjust the power in the current sweep. In contrast to ALC, which requires
additional time during each sweep, the power correction from pre-measurement does
not change the time required per point.
Core applications are pulsed stimuli, with pulses too short to run ALC, even in a sepa-
rate pulse.
Correction logic
●
Similar to ALC, a particular wave (port and REF/MEAS) can be selected for correc-
tion
●
The start value is the power defined by the user, including the source flatness cali-
bration, if available
●
The firmware calculates the power of the calibrated wave and compares it to its
nominal value. If it observes a (significant) deviation, it adjusts the HW settings for
the next measurement.
●
The pre-measurement sweep is done with the same settings as the measurement
sweep
●
Power correction from pre-measurement cannot be combined with ALC.
●
During calibration, power correction from pre-measurement is temporarily disabled.
Pre-measurement mode
There are two pre-measurement modes:
●
"Continuous": The correction is applied from one sweep to the next. It integrates
seamlessly into the standard processing, but can lead to frequently changing HW
settings.
Basic concepts
To Next Page
Loading...
