R&S ZNB, Руководство пользователя, Страница: 232 / 1496

Concepts and Features
R&S
®
ZNB/ZNBT
232 User Manual 1173.9163.02 ─ 55
5.7.13 Internal Second Source
Options R&S ZNB-B2, R&S ZNB20-B2, R&S ZNB40-B2 (and R&S ZNBTx-B112)
The hardware options
●
R&S ZNB-B2 "Internal Second Source for R&S ZNB4, R&S ZNB8 (4-Port)" and
●
R&S ZNB20-B2, "Second Internal Generator for R&S ZNB20 (4-Port)"
●
R&S ZNB40-B2, "Second Internal Generator for R&S ZNB40 (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 5.7.4, "Frequency Conversion Measurements" , on page 215.
For the R&S ZNBT, an internal second source is automatically added with option
R&S ZNBTx-B112 (x=8,20), i.e. if the analyzer is equipped with 12 ports or more; see
Chapter 5.7.1, "Additional Test Ports (R&S ZNBT only)" , on page 201.
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 independent signals.
●
Operation with Internal Second Source is not supported, if External Switch Matri-
ces are part of the RF connection configuration.
5.7.14 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.
5.7.15 GPIB Interface
Option R&S ZNB/ZNBT-B10
This hardware option provides a GPIB bus connector according to standard IEEE 488 /
IEC 625 (GPIB). The GPIB bus interface can be used for controlling the R&S
ZNB/
ZNBT from an external controller.
Optional Extensions and Accessories