Concepts and features
R&S
®
ZNA
156User Manual 1178.6462.02 ─ 20
The "snp Free Config" export mode allows you to define
●
the set of (physical) ports whose S-parameters shall be exported and
●
the order in which they are exported
The examples above represent the simple scenario with consecutive ports {1,...,n} and
natural ordering.
Data format
Frequencies are represented as single positive numbers, network parameter data as
pairs of numbers. The <frequency unit> and <data format> are specified in the
Option line. Numbers can be represented as decimal integers or floating point num-
bers, with "." used as decimal separator. Scientific notation is allowed (e.g.,
1.2345e-12). No minimum or maximum limits are placed on numerical precision.
For Touchstone export, the R&S ZNA uses the normalized scientific notation, with a
significand (mantissa) of length 17 (+1 for the minus sign) and an exponent with maxi-
mum length 2 (+1 for the minus sign).
1.000000000000000e+09 -2.375070438098596e-01 -4.533104459856211e-01
1.010000000000000e+09 -3.132740349817996e-01 -5.874596585157938e-01
1.020000000000000e+09 -3.062444919836442e-01 -4.587379501906624e-01
Conditions for Touchstone file export
●
One-port Touchstone files with data from a single trace
Typically, Touchstone files contain a complete set of S-parameter traces of an n-
port network. The only exceptions are s1p files created from arbitrary S-parameter
traces using the "s1p Active Trace" export function in the Trace Data tab or the
remote command MMEMory:STORe:TRACe.
●
Touchstone files containing S-matrices
– For a one-port Touchstone file, the reflection coefficient for the specified port
(S
ii
for port i) must be measured. If a full one-port (Refl OSM) or a full n-port
(TOSM, ...) calibration is available for the specified port, it is possible to export
the data even when the trace is not displayed.
– For a multiport Touchstone file *.s<n>p, either a full multiport system error
correction or a complete set of n
2
S-parameter traces must be available.
If the port configuration contains balanced ports, the exported Touchstone file
contains the converted single-ended S-parameters unless you enable "Bal-
anced Params" during export.
– Export of balanced (symmetric) S-parameters must be enabled. If you want to
export balanced S-parameters, make sure that all these parameters are mea-
sured, and that for each involved balanced port both physical ports are part of
the export.
This type of export can be initiated from the GUI by using the "s<n>p Port ..." or
"snp Free Config. ..." functions of the Trace Data tab or by the remote command
MMEMory:STORe:TRACe:PORTs on page 1216.
Operations on traces
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