Basic operation
R&S
®
ZCxxx
33
Getting Started 1177.5156.02 ─ 05
c) "Leveling Table (Global)"
Perform leveling if you want the power levels at the waveguide port to be
constant over frequency. Also perform leveling if you want to have fre-
quency-independent, variable, known power levels at the waveguide port.
The latter is necessary for power sweeps, but also for automatic level con-
trol (ALC). ALC, in turn, is recommended for all measurements that require
precise power levels at the waveguide port, in particular for measuring
non-linear characteristics of a DUT (compression, intermodulation, spec-
trum...). For details on ALC, see the R&S
ZNA help system or user man-
ual.
Based on an existing reference receiver calibration, the leveling procedure
records the output power on a two-dimensional power/frequency grid with
equidistant RF IN power levels and frequencies. The leveling logic then
uses two-dimensional interpolation to determine the appropriate RF IN
level for the desired output level at a given frequency.
Since version 2.40 of the R&S
ZNA firmware, leveling is part of software
option R&S
ZNA-K8.
d) "Source Flatness"
Based on an existing reference receiver calibration, the R&S
ZNA varies
the frequency and adjusts its source power so that the reference receiver
readings correspond to the desired output power at the waveguide port of
the converter.
If leveling data is available for a port, a source flatness calibration is not
necessary for this port.
For converter setups, reduce the convergence factor to 0.3, or 0.1 for high
frequency converters (Channel – [Cal] key > "Power Cal Settings" tab >
"Convergence").
Scalar power calibration and leveling (optional)
