Not sure about Manufacturers response

At low frequencies, the Z-vs-F curve looks just like an inductor. At any point on that slope, X = omega*L.

At high frequencies, after the slope levels off, you sort of have R.

Most ferrite beads have base inductance in the 1 uH ballpark, order of magnitude.

Most handheld LCR meters are wildly inaccurate on inductance, period.

OK, I see the problem, as my only impedance bridge is an AUDIO frequency one. Yes, if you put the ferrite on a 1MHz + bridge, then the losses in the ferrite will get quite significant, and it WILL have a true R component.

Jon

The ferrite doesn't alter the R at all, all it adds

that is wrong

I made some measurements of ferrite bead impedance from 30kHz to 1GHz. There are a few small ferrite toroid cores thrown in as well. The difference is striking. The plots are at . Ask if you want the raw S11 data.

Jeroen Belleman

Very interesting.

You probably know a lot of the links on your page are blocked.

NT

CERN used to be very open, but gradually more and more is getting blocked. I barely notice, because I'm inside. In the hostile and litigious atmosphere prevalent on the internet, it's understandable that we're getting more careful about what we show publicly. That's a pity, but unfortunately necessary.

Is there anything in particular that you wanted to see, but couldn't?

Jeroen Belleman

thank you, but don't worry, I'm busier than I was now.

NT