Concepts and Features
R&S
®
ZNC
84
User Manual 1173.9557.02 ─ 13
Safety aspects
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The calibration unit is intended for direct connection to R&S ZNC 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.
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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 network
analyzer is performing measurements. It must be disconnected during a firmware
update.
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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.
3.5.5.2
Performing an Automatic Calibration
After connection and initialization, you can use the calibration unit as follows:
1. Connect n analyzer ports (n = 1 or 2, depending on the number of ports to be cali-
brated) to n arbitrary ports of the calibration unit. Terminate all unused ports of the
unit (no. n + 1 to 2 or 4) with a 50 Ω match.
2. Perform the automatic calibration for the selected number of ports using the "Cali-
bration Unit" wizard (CHANNEL > CAL > Start Cal (Cal Unit); see
3. Remove the test cables from the unit, connect your DUT instead and perform cali-
brated measurements.
The assignment between the analyzer ports and the cal unit ports can be detected auto-
matically. 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".
Calibration