Concepts and Features
R&S
®
ZNA
133
User Manual 1178.6462.02 ─ 12
2. The analyzer compares the measurement data of the standards with their known,
ideal response. The difference is used to calculate the system errors using a partic-
ular error model (calibration type) and derive a set of system error correction data.
3. The system error correction data is used to correct the measurement results of a
DUT that is measured instead of the standards.
Calibration is always channel-specific because it depends on the hardware settings, in
particular on the sweep range. This means that a system error correction data set is
stored with the calibrated channel.
The analyzer provides a wide range of sophisticated calibration methods for all types of
measurements. Which calibration method is selected depends on the expected system
errors, the accuracy requirements of the measurement, on the test setup and on the
types of calibration standards available.
Due to the analyzer's calibration wizard, calibration is a straightforward, menu-guided
process. Moreover, it is possible to perform the entire calibration process automatically
using a Calibration Unit (e.g. R&S
ZN-Z5x or R&S
ZN-Z15x).
The system error correction data determined in a calibration procedure are stored on
the analyzer. You can read these correction data using the remote control command
[SENSe<Ch>:]CORRection:CDATa
. You can also replace the correction data of the
analyzer by your own correction data sets.
Cal Off label
A label "Cal Off" appears in the trace line if the system error correction no longer
applies to the trace:
This can happen for one of the following reasons:
●
The sweep range is outside the calibrated frequency range.
●
The channel calibration is not sufficient for the measured quantity (e.g. a one-port
calibration has been performed, but the measured quantity is a transmission
parameter).
●
There is a mismatch between the current Frequency Offset settings and the Fre-
quency Offset settings that were used during calibration (see
●
The system error correction has been switched off deliberately ("User Cal Active" is
disabled).
The analyzer provides other labels to indicate the status of the current calibration; see
Chapter 5.5.4, "Calibration Labels"
Calibration