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Concepts and features
R&S
®
ZND
226
User Manual 1173.9557.02 ─ 61
2-port VNA
Route 1
Route 2
This kind of "multipath calibration" offers the following additional benefit:
During manual calibration, the measured reflection/transmission coefficients are pre-
sented as memory traces - one per path. By comparing these traces, it should be pos-
sible to track down hardware problems (cables, connectors, matrix, ...) already during
calibration.
4.7.21
External DLLs
The R&S
ZND firmware provides a plug-in interface that allows you to extend the VNA
firmware with custom functionality (measurements, device control, ...) .
The plug-in interface allows the external software to interact with the firmware before
and after a change of the:
●
channel
●
drive port
●
sweep segment
●
sweep point
The plug-in then can perform arbitrary actions and eventually return data to the VNA
firmware:
●
as custom traces
●
as input values for math functions for the calculation of other traces
To calculate a custom trace, the plug-in can make use of all data access points in the
channel calculation chain. See
Chapter 4.1.5.1, "Channel data flow"
Furthermore, it can communicate with other processes / peripherals that are not part of
the VNA firmware or host OS.
Optional extensions and accessories
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