Removal; Calibration - R&S ZNB Series User Manual

®
R&S ZNB/ZNBT
total number of standard measurements for an n-port TOSM calibration is 3n + n (n-1)
= n (n+2). However, this number can be significantly decreased without losing too
much precision (see
Through
The analyzer automatically performs each through measurement in both directions, so
the number of connected standards is smaller than the number of measurements.
Manual TOSM calibration supports
UOSM: TOSM with unknown Through
The analyzer can perform a TOSM calibration with any 2-port network serving as
through connection, as long as it fulfills the reciprocity condition S
TOSM calibration is referred to as UOSM (Unknown through – Open – Short – Match)
calibration. It can be selected as follows:
●
If different connector types are assigned to the test ports, the analyzer automati-
cally replaces TOSM by UOSM.
[The network analyzer supports different connector types at its test ports to mea-
sure DUTs with different port connectors; see also

removal",

●
If the same connector types are used but an appropriate Through standard is not
defined, the analyzer also replaces TOSM by UOSM.
●
UOSM can be selected explicitly in the "Calibration Setting" dialog.
After acquiring the calibration sweep data for the unknown through, the analyzer auto-
matically determines its delay time/transmission phase.
4.5.1.5 Adapter removal
Many DUTs use different connector types on their RF ports (e.g. port 1: N-type connec-
tor, female; port 2: PC 3.5-type connector, female).
DUTs of this sort are also known as noninsertable devices.
A suitable calibration kit is then required for each of the different connector types. The
kit must include, as a minimum, the standards that are used for one-port calibration.
The through-connection between test ports with different connector types must be
made using adapters.
The problem here is that unlike Through standards, adapters are usually not character-
ized, i.e. their delay time/transmission phase is unknown.
If the adapter fulfills the reciprocity condition S
through in an UOSM calibration (see
on page 168).
User Manual 1173.9163.02 ─ 62
Chapter 4.5.1.11, "Full n-Port calibration with reduced number of
connections", on page 173)
on page 168. ]
Complementary isolation measurement
Chapter 4.5.1.5, "Adapter
= S , it can serve as Unknown
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"UOSM: TOSM with unknown Through"
Concepts and features

Calibration

(optional).
= S . The modified
21 12
168