Concepts and Features
R&S
®
ZNB/ZNBT
227
User Manual 1173.9163.02 ─ 38
Figure 4-14: R&S
ZNB/ZNBT connected to two R&S ZN-Z84, each equipped as 2x24 matrix
While it is allowed to connect multiple matrices to a R&S
ZNB/ZNBT, matrix cascading
is
not
supported.
Operation with
not
supported across switch matrices.
However, an N-port analyzer is always limited to measuring N signals simultaneously,
i.e. even though the DUT is fully connected to the switch matrix, it may not be possible
to measure all b-waves simultaneously. For example, consider a DUT with 6 unbal-
anced ports, connected to a 2-port analyzer via a 2x6 matrix (e.g. a R&S ZN-Z8x base
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 might 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-
Optional Extensions and Accessories
