R&S ZVL
GUI Reference
Channel Menu
Operating Manual 1303.6580.32-06
238
Note:
•
The calibration unit is intended for direct connection to ZVB network
analyzers following the procedure described above. You can also connect the
unit before switching on the analyzer. Do not connect the unit to other USB
hosts, e.g. a PC, or insert any USB hubs between the analyzer and the unit,
as this may cause damage to the unit or the host.
•
You can connect only one calibration unit at a time. However, you can
simultaneously connect a cal unit and another device (mouse, USB memory
stick etc.) to the USB connectors of the analyzer.
•
An unused calibration unit may remain connected to the USB port while the
network analyzer is performing measurements. It must be disconnected
during a firmware update.
•
It is safe to connect or disconnect the calibration unit while the network
analyzer is operating. Never connect or disconnect the unit while data is
being transferred between the analyzer and the unit. Never connect the unit
during a firmware update.
Performing an Automatic Calibration
After connection and initialization, you can use the calibration unit as follows:
Connect the analyzer ports you wish to calibrate (one/two ports for a one/two-port calibration) to
arbitrary ports of the calibration unit. If you connect just one cal unit port, terminate the other port with
a 50
V
match.
Perform the automatic calibration for the selected number of ports using the
S-Parameter Wizard
or
the
Start Calibration
menu.
Remove the test cables from the unit, connect your DUT instead and perform calibrated
measurements.
The assignment between the analyzer ports and the cal unit ports is detected automatically. If auto-
detection fails (e.g. because of a high attenuation in the signal path), connect matching port numbers and
click
Default Port Assignment
at the beginning of the calibration process.
Accuracy considerations
To ensure an accurate calibration, please observe the following items:
•
Unused ports of the calibration unit must be terminated with a 50
V
match.
•
No adaptors must be inserted between the calibration unit and the test ports.
•
After connecting the unit to the USB port, allow for a sufficient warm-up time (see
"Specifications"
) before starting the calibration.
•
Highest accuracy is achieved if the input power at the cal unit ports is approx. –10 dBm. This
corresponds to the source power of the R&S ZVL after a preset of the instrument. If the test
setup contains a large attenuation, increase the source power to compensate for the
attenuation.
