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Ferrite cable clamp filter.
The geometry and electromagnetic properties of coiled wire over the ferrite bead result in an impedance for high frequency signals attenuating high frequency emi rfi.
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This does not mean that ferrite rings are a poor choice.
Initial test results of ferrite rings showed poor performance compared to clamps when a single wire was passed through a ring.
Before mounting the clamp filter noise was emitted at a broad frequency band from 100 to 600 mhz.
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Unfortunately ferrite beads also called a ferrite choke ferrite clamp ferrite collar emi filter bead or even a ferrite ring filter can be a bit of a mystery.
20 pcs snap on ferrite core cord ring rfi emi noise filter suppressor cable clip for 3 5mm 5mm 7mm 9mm 13mm diameter cable black 4 1 out of 5 stars 142 9 99 9.
Ferrite clamp on cores are available at mouser electronics.
0730 clamp filter connected to the power cable.
Ferrite rings are a convenient way for a large cable to achieve multiple turns and high exposure to the ferrite material.
Mouser offers inventory pricing datasheets for ferrite clamp on cores.
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As in the case of the previous test after winding the exclusive cable twice around the clamp filter noise was relatively reduced by 5 to 10 db.
The measurement results are shown in figure 4.