VNA concepts and features
R&S
®
ZNL/ZNLE
271
User Manual 1178.5966.02 ─ 19
unit, and only validates connected ports. Thus, if a 2-port cal unit is connected to a 4-
port calibrated channel, only the two connected instrument ports are validated against
the cal unit.
The validation logic proceeds through the connected ports p
∈
{1, ..., 4} in ascending
order, measuring S
pp
for the Open, Short and Match standard. It then compares the
measured S
pp
values with the corresponding reflection S parameters of the cal unit's
factory characterization. The on-screen feedback indicates success ("PASS", failure
("FAIL") or provides a warning about undetected ports.
For a channel with more calibrated ports than cal unit ports available, you can change
the port assignments and rerun the automated validation. Or you can switch to
advanced mode and validate each port manually.
Advanced mode
In advanced mode you can configure the validation settings (reference characteriza-
tion, deviation limits) and run or rerun particular measurements (reflection at port p with
connected Open, Short or Match).
Calibration
