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Concepts and Features
R&S
®
ZNA
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User Manual 1178.6462.02 ─ 12
If an external DLL is configured for permanent use, it performs a particlar task (such as
switching the state of a DUT or controlling external devices) without providing data.
5.7.30.3
Trace Calculation in the Channel Calculation Chain
To enable the calculation of trace results using data from external DLLs, a dedicated
calculation step for external DLLs is inserted directly after the averaging step in the cal-
culation chain (see
This position allows maximum flexibility, because:
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The trace calculation chain is limited to one input for one output
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The position allows the plugin to use the results of the averaging step, and the
trace data is calculated in the same way as for other calculation steps
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All internal measurement types can be used as input for the new calculation step
The new calculation step is only enabled if a plugin is installed (and active), and a cus-
tom trace is requested.
The new calculation step serves all active external DLLs. When custom traces are
requested, the firmware asks the related DLLs which input traces they need to calcu-
late "their" traces. During the calculation, the requested inputs are provided to the DLL,
which then calculates its requested traces.
Due to its position, all internal trace types are allowed as inputs. External types are
also allowed if no circular dependency is created between them.
Optional Extensions and Accessories