data-based standard interpolation method

[Ehsan Shokrolahzade]

Dear Michael,

I went to check the graph of my data-based standards, and they look different from the original file. After some tinkering, I found out it only looks the same with the same frequency points .My question is, what is the interpolation method used for these standards, and is there a way to change it? Below, you can find the standard with default frequency points vs the original file

Best regards

Ehsan

[Michael Wollensack METAS]

Hi,

VNA Tools uses cubic interpolation. And you can not change it.

Details:

The real and imaginary parts are interpolated using cubic interpolation. If I would use linear interpolation the magnitude of a high reflect would get to small. In your example is getting a little bit to large. Spline interpolation has as well other drawbacks. That's the reason why I have chosen cubic interpolation.

Normally I say: AVOID INTERPOLATION.

If you want to use another interpolation routine you could use the Script tabular page of VNA Tools, see the following links:

https://wollmich.github.io/metas-vna-tools-programming-reference/html/M_Metas_Vna_Tools_Script_1_LoadSParamData.htm

https://wollmich.github.io/metas-vna-tools-programming-reference/html/M_Metas_Vna_Data_SParamTools_SplineInterpolation__1.htm

https://wollmich.github.io/metas-vna-tools-programming-reference/html/M_Metas_Vna_Data_SParamTools_InterpolationMagPhase__1.htm

https://wollmich.github.io/metas-vna-tools-programming-reference/html/M_Metas_Vna_Tools_Script_1_SaveSParamData.htm

Regards

Michael