The unit of magnetic beads is ohm, rather than hunter, it should pay special attention to it. Because the unit is in according with the magnetic impedance it produces at a certain frequency to nominal, the units of impedance also ohms.
The DATASHEET of beads will typically provide the curve of frequency and impedance characteristics, general is standard of 100MHz, such as 1000R@100MHz, meaning that at 100MHz frequency when the magnetic impedance is equal to 600 ohms.
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