R&S ZNB - Page 85

Concepts and Features
R&S
®
ZNB/ZNBT
85User Manual 1173.9163.02 ─ 55
2 3 4
5 6 7 8
9
10 11 12
13 14 15 16
1
18 19 20
21 22 23 24
17
DUT1 DUT2
VNA
●
For analyzers with Internal Second Source, to reduce "crosstalk" between the
DUTs a frequency offset can be applied between the corresponding port groups
(see "Parallel Measurements with Frequency Offset" on page 86).
●
Parallel Frequency Conversion Measurements require identical conversion settings
for all port groups
●
Parallel Intermodulation Measurements are not supported
●
Parallel measurements are not possible if External Switch Matrices are used
Arbitrary Drive Port Order (R&S ZNBT only)
When performing parallel measurements on multiple DUTs, by default the R&S ZNBT
firmware automatically selects the ports that should be driven in parallel. However, due
to possible crosstalk between DUT ports, it can be beneficial to prevent some ports
from being driven in parallel. This could be achieved by changing the cabling of the
DUT, but this is not always possible - for example if the same cabling should be used
for different measurements and different kinds of DUTs. Furthermore changing the
cabling requires a recalibration of the affected channels.
To cope with this problem the R&S ZNBT firmware allows to restrict or even completely
define these "drive port sets" by specifying a drive port order for selected DUTs.
Basic Concepts