How do I create a ferrite bead in Multisim

[stwomey]

I would to simulate a ferrite bead in Multisim.  Has anyone done this or know how to do this?

[kittmaster]

Isn't a bead simply an encased inductor.  I'd imagine you could use a regular inductor and adjust the Rw values to meet the specifications your trying to simulate.

[lacy]

Kitt is right, the only thing a bead is is a smoll inductance usually used for EMF filtering or in high frequency applications where a coil would not work efficiently. You can try Kitt's method and see if it will work for you.

There are model on the I-net. Not to sound obvious, but have your tire to Google for "Ferrite Bead Spice Model"? I found one the other day in a PDF file, but I neglected to download it and do not know the link for it right now.

I hope you can find what you need.

[ajt]

I don't think you will get the correct results modeling a ferrite bead as a small inductor for several reasons.  At least the model requires a series resistance and some way to include the permeability of the material and the affects of current.  Frankly, IMHO, the chances of producing a simulation that is representative of the results you would get in an EMC test is near zero.  

The following is a link to some ferrite bead spice models.  I believe some of the other major suppliers have models as well.

http://www.steward.com/spice.asp