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Added SCPI command for touchstone file format

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Jan Käberich 2021-09-07 22:49:51 +02:00
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24
Documentation/UserManual/ProgrammingGuide.tex
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@ -422,6 +422,30 @@ Depending on the sweep and possible confiigured math operations, x may be either
-0.0458452,-0.028729
\end{example}
\subsubsection{VNA:TRACe:TOUCHSTONE}
\query{Returns the content of multiple trace according to the touchstone format}{VNA:TRACe:TOUCHSTONE?}{<trace1>,<trace2>,<trace3>,...}{Touchstone file content in ASCII}
Some additional constraints apply:
\begin{itemize}
\item The number of specified traces must be a square number. The number of ports in the touchstone file is inferred from that.
\item Only frequency domain traces are allowed.
\item All traces must have the same number of points and the same start/stop frequency.
\item The order in which the traces are specified matters and depending on its index and each trace must be a reflection or transmission measurement:
\begin{itemize}
\item Assuming that $n$ is the number of ports of the desired touchstone file, the $n*n$ number of traces must be specified in this order:
$$ S_{11}...S_{1n},S_{21}...S_{2n},...,S_{n1}...S_{nn} $$
\item For every trace $S_{ij}$, the trace must contain a reflection measurement if $i=j$ and a transmission measurement if $i\neq j$.
\end{itemize}
\item Traces can be specified either by name or by index.
\item A deviation from any of these points (invalid number of traces, non-existing trace, wrong order, ...) will result in an error being returned.
\end{itemize}
\begin{example}
:VNA:TRACE:TOUCHSTONE? S11 S12 S21 S22
# GHZ S RI R 50
1.000000000000 1.000497817993 0.010679213330 0.000013886895 -0.000054684886 -0.000023392624 -0.000021111371 0.401717424393 0.702864229679
1.002000000000 1.000323534012 0.010577851906 -0.000011075452 -0.000013504875 0.000000477609 -0.000007789199 0.413144201040 0.696514129639
...
\end{example}
\subsubsection{VNA:TRACe:MAXFrequency}
\query{Returns the highest frequency contained in the trace}{VNA:TRACe:MAXFrequency?}{<trace>, either by name or by index}{maximum frequency in Hz}