VNA Concepts and Features
R&S
®
ZNL/ZNLE
258
User Manual 1178.5966.02 ─ 07
Maximum RF input power
The maximum RF input power of the calibration unit is beyond the RF output power
range of the analyzer, so there is no risk of damage if the device is directly connected
to the test ports. If you use an external power amplifier, make sure that the maximum
RF input power of the calibration unit quoted in the data sheet is never exceeded.
The available calibration types depend on the number of ports to be calibrated. For a
single calibrated port, the reflection calibration types are available ("Refl Norm Open",
"Refl Norm Short", "Refl OSM").
If 2 ports should be calibrated, the analyzer provides the following additional calibration
types:
●
A single full 2-port (TOSM or UOSM) calibration.
A single full 2-port (TOSM or UOSM) calibration.
●
Two full one-port calibrations for the two calibrated ports.
●
A one path two port calibration. The node port is the source port for the one path
two port calibration (fully calibrated port).
●
A transmission normalization (bidirectional, forward or reverse). "Forward" trans-
mission normalization means that the signal direction is from port 1 to port 2.
8.5.5.3
Characterization of Calibration Units
Each calibration unit is delivered with factory characterization data which ensure an
accurate calibration for all standard applications. For specific modifications of the test
setup, e.g. the connection of additional adapters to a calibration unit, a modified set of
characterization data (suitable for the cal unit with adapters) may be desirable. The
R&S
ZNL/ZNLE provides a characterization wizard which you can use to generate your
own characterization data sets for (modified) R&S cal units. The characterization data
can be stored in the cal unit and used for automatic calibration whenever needed.
A cal unit characterization can be performed in a frequency sweep. The network ana-
lyzer must be properly calibrated, with the reference plane at the input ports of the
(modified) cal unit to be characterized.
The procedure involves the following steps:
1. Perform a calibration of your network analyzer, using the test setup and the calibra-
tion type you wish to perform with your calibration unit.
2. Connect the calibration unit to the network analyzer.
3. Access the "Characterize Cal Unit" dialog ([Cal] > "Cal Devices" > "Characterize
Cal Unit...") and select "Start Characterization...".
4. Step through the "Characterization" wizard, following the instructions in the dialogs.
Calibration
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