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ZVT GUI Reference
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Operating Manual 1145.1084.12 – 30 483
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:
1. Connect n analyzer ports (n = 1 to 8, depending on your analyzer and calibration unit model and
the number of ports to be calibrated) to n arbitrary ports of the calibration unit. Terminate all
unused cal unit ports (no. n + 1 to 2, 4, or 8) with a 50 Ω match.
You can also connect an n -port cal unit repeatedly in order to calibrate more than n analyzer
ports; see Using Multiple Port Assignments below.
2. Perform the automatic calibration for the selected number of ports using the Measurement Wizard
or the Start Calibration menu.
3. 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 cal unit ports must be terminated with a 50 Ω 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.
To ensure best accuracy the analyzer automatically reduces the source power to –10 dBm. If
the test setup contains a large attenuation, deactivate Automatic Power Reduction for
Calibration Unit in the Calibration tab of the System Config dialog and ensure an input power
of –10 dBm at the cal unit ports (please also refer to the separate "Specifications" document).
Attention!
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 calibration type depends on the number of ports. If a single port is calibrated, the analyzer uses full
one-port calibration. For 2 and more ports, the analyzer provides the following additional options:
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