Concepts and Features
R&S
®
ZNB/ZNBT
243
User Manual 1173.9163.02 ─ 53
unit without extensions). For each stimulus port, 5 sweeps are required to measure the
resulting b-waves, 6·5 = 30 sweeps in total.
For "real" 6-port analyzers (such as the R&S
ZNBT8), a single sweep per driving port
would be sufficient.
Furthermore, each additional sweep requires at least one matrix switching procedure.
This involves command processing and physical switching and hence can take some
time to complete. For mechanical switches (such as R&S ZV-Z81 variant 66), in partic-
ular, switching is quite slow and causes mechanical wear. To optimize the measure-
ment setup w.r.t. speed and resources, the characteristics of the available switch matri-
ces have to be accounted for.
5.7.22.2
Matrix Setup and Operation
Setting up a switch matrix at the R&S
ZNB/ZNBT firmware typically involves the follow-
ing steps:
1. establish the physical connection via the appropriate management interface (USB
or LAN or Direct Control).
2. register the matrix (as managed object).
3. define the RF configuration:
a) configure the matrix-VNA-connections according to the existing (or planned)
physical connections between VNA test ports and matrix VNA ports.
b) assign the matrix test ports and the remaining VNA ports (i.e. those that are not
connected to a matrix VNA port) to DUT test ports.
After this initial setup, the R&S
ZNB/ZNBT takes control of the attached matrices: it
allows you to configure the test ports and dynamically establishes the required matrix
routes according to the current measurement task.
To make a measurement, set up a channel where all unused logical ports are disabled.
Switch matrices are global resources: their configuration is not part of a recall set.
However, a recall set will contain information about the required matrices and their RF
connections. At the time the recall set is loaded, the R&S
ZNB/ZNBT checks whether
the same matrix setup is still active. If not, a wizard will guide the user through the
matrix configuration.
5.7.22.3
RF Connections and Matrix Connectivity
Depending on the design of the switch matrix and the RF connections between VNA
and matrix
Optional Extensions and Accessories
