To counter this problem, the FCC has set up rules and regulations to control and enforce limits on high frequency interferences. It is an effective and economical way of complying to FCC rules. The first step in addressing the EMI.RFI problem is to isolate the source of unwanted signals. If possible, reduce this source of signal to an acceptable level. Ferrites are then used to reduce or eliminate the interference on wirings and cables.
Ferrite suppressors are available in many different configurations.
Ferrites and toroids are common configurations. Split cores, multi aperture cores, round and flat cable suppressor cores are for the computer industries. Tapes beads on leads, radial beads, surface mount beads in accordance to EIA Specifications are available for automated manufacturing environments. The multi-line beads can be used as multiple signal turn beads or for better suppression, as multi turn beads. The selection of ferrite material for an application is determined by the frequencies of interferences.