Import existing raw data

[Michael Wollensack METAS]

Hi,

I want to use VNA Tools with some existing raw data measurements which are stored in one directory as Touchstone files (s2p). How can I import them into the Measurement Journal of VNA Tools?

Regards

[Michael Wollensack METAS]

Hi,

you can do that with the script in the attached Zip file. The script copies the raw data measurements to the sdatb file format and generates the measurement journal. The settings of the VNA are specified in the script. The cable stability and connector repeatability are as well specified in the script.

Hope this helps.

Regards

Michael

[Michael Wollensack METAS]

Hi,

I've updated the script to import existing measurement data. See the attached zip-file.

The wollowing things have changed:

• DUT Uncertainty added to measurement journal.
• Measurements are in the correct order (time stamp) in the journal.

[Michael Wollensack METAS]

Hi,

the obsolete properties `StabilityMag` and `StabilityPhase` of a cable have been replaced with the following properties `StabilityTransmissionMag` and `StabilityTransmissionPhase`. The `StabilityMag` and `StabilityPhase` properties were the two-way cable stability and  `StabilityTransmissionMag` and `StabilityTransmissionPhase` are the one-way cable stability.

I've updated the script to import existing measurement data. See the attached py-file.

Regards

Michael

[Mr Skinner]

Dear Michael

Thank you for your assistance with this query.

When it comes to switch terms, can these be imported into VNA Tools? Perhaps if they are saved in the correct format from the VNA, a format that is compatible with VNA Tools calibration?

Please can you specify if this is a possibility.

Best regards

James

[Michael Wollensack METAS]

Hi James,

Yes you can import as well switch terms into VNA Tools. E.g.: you could store the switch terms in a 2-port Touchstone file where

S11: is the switch term of port 1 when port 2 is driving (a1/b1_p2)

S21: is set to 0

S12: is set to 0

S22: is the switch term of port 2 when port 1 is driving (a2/b2_p1)

Regards

Michael

[Mr Skinner]

Hi Michael,

Excellent, many thanks for your help.

Best regards

James

[craig losey]

Hi I'm trying to use your script but whenever I get to the following line:

journal = CreateNewProject(fis[0].LastWriteTime.AddSeconds)

I get the following error in python:

Traceback (most recent call last):
  File "<stdin>", line 4, in <module>
  File "<stdin>", line 6, in CreateNewProject
  File "<stdin>", line 22, in AddVnaSettingsToJournal
TypeError: No method matches given arguments for ValueType..ctor: ()

and it fails to load any data and exits.

Can you please help?

[craig losey]

Hi.  I found my issue.

The problem was that I was using the second VNA script that was on the group and it didnt include or called out the cable stability incorrectly.  Once I switched to the 3rd script on this thread the script worked as described.