Concepts and features
R&S
®
ZNA
181
User Manual 1178.6462.02 ─ 20
Recommended use
●
The calibration unit is intended for direct connection to R&S
ZNA network ana-
lyzers 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 dam-
agethe unit or the host.
●
You can connect several calibration units to the different USB ports of the analyzer.
You can also connect cal units and other devices (mouse, USB memory stick etc.)
simultaneously.
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An unused calibration unit may remain connected to the USB port while the net-
work analyzer is performing measurements. It must be disconnected during a firm-
ware 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.
4.5.5.2
Performing an automatic calibration
After connection and initialization of the calibration unit, define an automatic calibration
in the calibration setup dialog; see
Chapter 5.11.1.4, "Calibration setup dialog"
on page 527), Then perform the automatic calibration of the related test ports using the
calibration wizard; see
Chapter 5.11.1.3, "Calibration wizard"
indicates the required port (re-)connections.
The assignment between the analyzer ports and the cal unit ports can be detected
automatically. If auto-detection fails (e.g. because of a high attenuation in the signal
path), you can either enter the port assignment manually or connect matching port
numbers and select "Default Port Assignment".
When finished, remove the test cables from the unit, connect your DUT instead and
perform calibrated measurements.
Calibration
