Concepts and features
R&S
®
ZNB/ZNBT
255User Manual 1173.9163.02 ─ 62
Option R&S ZNB-B1 for R&S ZNB4|8
Hardware option R&S ZNB-B1 provides:
●
Bias tees for two-port R&S ZNB4|8, order no. 1316.1700.02
●
Bias tees for four-port R&S ZNB4|8, order no. 1316.1700.04
The optional bias tees have an impact on the start frequency of R&S ZNB4 and
R&S ZNB8 network analyzers; for details refer to the data sheet and to [SENSe:]FRE-
Quency... commands.
4.7.14 Internal second source
Options R&S ZNB-B2, R&S ZNB<20|26|40|43>-B2 (and R&S ZNBT<8|20|26|40-
B112)
The hardware options
●
R&S ZNB-B2 "Internal Second Source for R&S ZNB4, R&S ZNB8 (4-Port)" and
●
R&S ZNB<20|26|40|43>-B2, "Second Internal Generator for R&S ZNB<20|26|40|
43> (4-Port)"
expand four-port network analyzers R&S ZNB with a second internal generator, which
can be used as an additional stimulus signal, e.g for mixer measurements; see Chap-
ter 4.7.4, "Frequency conversion measurements", on page 236.
For the R&S ZNBTxx, an internal second source is automatically added with option
R&S ZNBTxx-B112, i.e. if the analyzer is equipped with 12 ports or more; see Chap-
ter 4.7.1, "Additional test ports (R&S ZNBT only)", on page 222.
Limitations
With two internal sources the physical VNA ports are split into groups P1 and P2 such
that source 1 can only drive ports in P1 and source 2 can only drive ports in P2:
●
P1 = {1,2} and P2 = {3,4} for a four-port R&S ZNB
●
P1 = {1,...,8} and P2 = {9,...,24} for the R&S ZNBT
Independent signals require the source ports to reside in different port groups. On the
R&S ZNB, for example, you cannot use ports 1 and 2 as independent source ports. A
R&S ZNBT on the other hand must be equipped with at least 12 ports to allow inde-
pendent signals.
4.7.15 Precision frequency reference
Option R&S ZNB/ZNBT-B4
An optional OCXO improves the static frequency accuracy of the R&S ZNB/ZNBT. For
details, refer to the data sheet.
Optional extensions and accessories
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