Concepts and features
R&S
®
ZNA
215User Manual 1178.6462.02 ─ 29
only validates connected ports. Thus, if a 2-port cal unit is connected to a 4-port cali-
brated 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.
Calibration
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