R&S ZNA50 - Calibration Types

Concepts and features
R&S
®
ZNA
160User Manual 1178.6462.02 ─ 20
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 "Parallel Measure-
ments with Frequency Offset" on page 90)
●
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 4.5.4, "Calibration labels", on page 178.
Calibration and port de-/activation
The analyzer fimware automatically activates/deactivates ports during/after a (success-
ful) calibration:
●
Calibrated ports that were previously disabled, are automatically enabled as single-
ended logical ports.
●
An uncalibrated port that is not used by a measurement (i.e. the port is not required
by any trace of the related channel) is disabled.
4.5.1 Calibration types
The analyzer provides a wide range of calibration types for one, two or more ports. The
calibration types differ in the number and types of standards used, the error terms, i.e.
the type of systematic errors corrected and the general accuracy. The following table
gives an overview.
Table 4-7: Overview of calibration types
Calibration Type Standards Parameters Error Terms General Accuracy Application
Reflection Normali-
zation
Open or Short S
ii
for Port i Reflection tracking Low to medium Reflection measure-
ments on any port.
Transmission Nor-
malization
Through S
ij
for port pair (i,j), i
≠ j
Transmission track-
ing
Medium Transmission mea-
surements in any
direction and
between any combi-
nation of ports.
Calibration