The Analyzer allows to save S-parameters to a Touchstone file. Files in this format are typical for most circuit simulator programs. The Touchstone file contains frequency values and S-parameters.
The Touchstone file saving function is applied to individual channels. Activate the channel to use this function (See Selection of Active Trace/Channel).
The *.S1P files are used for saving S11 and S22 parameters of a one-port device.
The *.S2P files are used for saving all four S-parameters of a two-port device.
The Touchstone file contains comments, header, and trace data lines. The header starts from the «#» symbol. Comments start from the «!» symbol. Comment contains following strings:
•Model, serial number, software version.
•Save date (in dd.mm.yyyy hh:mm:ss format).
•The name of the saved parameters and their units.
The *.S1P Touchstone file for one-port measurements:
! Comments |
||
# Hz S FMT R Z0 |
||
F[0] |
{S11}’ |
{S11}” |
F[1] |
{S11}’ |
{S11}” |
|
. . . |
|
F[N] |
{S11}’ |
{S11}” |
The *.S2P Touchstone file for two-port measurements:
! Comments |
||||||||
# Hz S FMT R Z0 |
||||||||
F[0] |
{S11}’ |
{S11}” |
{S21}’ |
{S21}” |
{S12}’ |
{S12}” |
{S22}’ |
{S22}” |
F[1] |
{S11}’ |
{S11}” |
{S21}’ |
{S21}” |
{S12}’ |
{S12}” |
{S22}’ |
{S22}” |
. . . |
||||||||
F[N] |
{S11}’ |
{S11}” |
{S21}’ |
{S21}” |
{S12}’ |
{S12}” |
{S22}’ |
{S22}” |
Hz — frequency measurement units (kHz, MHz, GHz);
FMT — data format:
•RI — real and imaginary parts;
•MA — linear magnitude and phase in degrees;
•DB — logarithmic magnitude in dB and phase in degrees;
Z0 — reference impedance value;
F[n] — frequency at measurement point n;
{…}’ — {real part (RI) | linear magnitude (MA) | logarithmic magnitude (DB)};
{…}” — {imaginary part (RI) | phase in degrees (MA) | phase in degrees (DB)}.
Touchstone File Saving
|
To select the saving type, use the following softkeys: Save/Recall > Save Data To Touchstone File > Type Then select the required Touchstone type: •1-Port (s1p) |
|
To select the data format: Save/Recall > Touchstone Data Save > Format Then select the required Touchstone format: •Real-Imaginary •Magnitude-Angle •dB-Angle |
|
To select the Touchstone separator type, use the following softkeys: Save/Recall > Touchstone Data Save > Separator Then select the required Touchstone separator: •Tab •Space |
Touchstone File Recalling
The Analyzer allows to recall data from the Touchstone files. Data can be loaded to memory traces or to data traces. When loading data to data traces, the Analyzer switches to hold mode to avoid writing over the recalled data with current data. When loading data to the memory traces, the sweep hold does not occur.
|
To load the data from the Touchstone file, use one of the softkeys: Save/Recall >Touchstone Data Recall Then select the required data loading method: •Active Trace Memory — loading data to the active trace memory. •All Traces Memory — loading data to the memory of all traces. •Static Trace. |
|
To select the port mapping, use the VNA Port dropdown to assign the VNA port to the file port. |
|
|
