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Re: Measuring AL value via NanoVNA #coils #transformer

 

Hi,

I wrote several articles on nanoVNA measurements.

You can find them in English here:

There's also a part about determening toriods, mu's and AL.

73

Arie PA3A

Op 4-7-2022 om 18:51 schreef tomas.geci@...:

Dear OM, I'm interested about various measurements with NanoVNA but now I'm fighting with some fundamental questions not related only to nano VNA. but still unable to find answers, even after reading a lot of articles (for example k9yc, palomar engineers, and not only...)

- when I will try to determine ferrite core material by inductance and AL value, how can I be sure about right frequency for inductance? inductance could vary with frequency (various permeability) and then my AL value calculation could be wrong.
- I read somewhere that chokes need higher AL value then transformers. Why chokes requires higher AL value and transformers lower? It is because in chokes big AL value means high inductance with small amount of winding and wire and then high impedance for common mode currents with good efficiency?

Many thanks for answers, hope I will find an answer even when it is not simple topic ?

sources which I used:
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