[TowerTalk] Measuring Common Mode Choke with Anritsu VNA

[Gary Johnson]

Hi Maximo,

The calculation you need in order to produce series impedance is this:

Z = 100*(1-S21)/S21    

Note that these are all complex values. If your VNA has built-in math capability, use that. Otherwise export S21 and do the calculation in Excel.  Be sure to check your calculation by measuring something simple like resistors and maybe a known inductor. Measuring high-value resistors will also demonstrate the limitations of your test setup.

-Gary NA6O

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> What I can do, and in fact I do, is to export the measure in .s2p Touchstone format, then apply some maths on a excel sheet to convert LogMag and Phase to complex R, complex I, and finally complex Z. All of that on Excel.
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> But to get that directly on screen would be much better.
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