R&S 1332.4500K22, Руководство пользователя

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Concepts and features
R&S
®
ZNA
165 User Manual 1178.6462.02 ─ 20
Number of ports Number of standards
to be connected Number of standard
measurements
Number of error terms *)
2 2 * 3
+1 = 7
2 * 3
+2 * 1 = 8
2 * 3
+ 2 * 2 = 10
3 3 * 3
+ 2 + 1 = 12
3 * 3
+2 * (2 + 1) = 15
3 * 3
+ 2 * 2 * 3 = 21
4 4 * 3
+3 + 2 + 1 = 18
4 * 3
+2 * (3 + 2 + 1) = 24
4 * 3
+ 2 * 2 * 6 = 36
*) No isolation terms are available.
An Open, Through and Match measurement is required at each port; in addition, for a
full TOSM, a Through must be measured for every directed port pair. Therefore the
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 Chapter 4.5.1.11, "Full n-Port calibration with reduced number of
Through connections" , on page 170)
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 Complementary isolation measurement (optional).
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
21
= S
12
. The modified
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
Chapter 4.5.1.5, "Adapter
removal" , on page 165. ]
●
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).
Calibration