Concepts and features
R&S
®
ZNA
310User Manual 1178.6462.02 ─ 29
4.7.34 Direct source monitor access
R&S ZNAxx-B161/B163/U161/U163
For instruments that are equipped with Source step attenuators, the direct source mon-
itor options give access to the unattenuated generator signals of port 1 and 3. The sig-
nal does not have to pass the respective source step attenuator, which is particularly
useful for measurements requiring a low stimulus power, such as high gain (converter)
measurements. Taking the "attenuated" signal as the reference signal would result in
noisy results, so it is recommended to use the monitor signal as the reference signal in
this case.
●
Option R&S ZNAxx-B161 provides direct access for port 1 of a R&S ZNAxx.
●
Option R&S ZNAxx-B163 is available for 4-port models only. It provides direct
access for port 1 and port 3.
Direct source monitor access is only available for instruments with Direct generator/
receiver access. The unattenuated source signal is available via monitor ports below
the respective direct-access connectors. Simply by rejumpering the direct-access ports
from "Ref Out → Ref In" to "Src Mon Out → Ref In", the monitor signal can be used as
the reference signal:
Source
Ref Meas
Src
Mon
Out
Out
In
Src
Step
Att
Rec
Step
Att
Port
InOut
Ref Source Meas
Out
Out
In
In
Port y
Src Mon Out
Figure 4-37: Standard B16 jumpering
Optional extensions and accessories
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