Concepts and features
R&S
®
ZNA
265
User Manual 1178.6462.02 ─ 20
additional measurements during calibration and measurement phase, the imperfect
receiver response is corrected mathematically.
4.7.12
Measurement uncertainty analysis
Option R&S
ZNA-K50/R&S
ZNA-K50P
Measurement uncertainty analysis is available if option R&S
ZNA-K50 and METAS
VNA Tools (version 2.2.6 or higher) are installed on the instrument.
Option R&S
ZNA-K50
P
offers the same functionality as option R&S
ZNA-K50, but
comes with METAS VNA Tools
p
reinstalled. It can be shipped with new instruments or
installed at Rohde&Schwarz service.
The purpose of the METAS VNA Tools software is to compute uncertainties of S-
parameter measurements. After registration, you can download it from the VNA Tools
Internet site (
).
●
The uncertainty analysis of the METAS VNA Tools is limited to S-parameter mea-
surements. Uncertainty analysis of wave quantities is not supported.
●
The uncertainty calculations are in line with EURAMET Calibration Guide No. 12
Version 3.0 (03/2018).
METAS Calibration
The VNA firmware directly interacts with the DLLs of the METAS VNA Tools. During a
"METAS Calibration", the VNA firmware collects all data that are required to set up a
METAS VNA Tools project. After the "METAS Calibration"
is comple-
ted, the analyzer is ready for real-time uncertainty analysis: after each sweep it passes
the raw (uncalibrated) S-parameters to the VNA tools and receives the calibrated S-
parameters plus uncertainties (95% confidence ellipse in the complex plane) in return.
The calibrated S-parameter traces plus their uncertainty bands can be displayed in
magnitude, phase, real and imaginary
. The display of uncertainties in
complex diagrams (polar, Smith) is not supported.
Optional extensions and accessories