Series BF Split Ferrite Suppressors for Round Cables POSITION OF SUPPRESSOR AUXILIARY EQUIPMENT OR POWER SOURCE RF SOURCE OR RF SOURCE RF SOURCE RF SOURCE OR RF SOURCE POSITION OF SUPPRESSOR The suppressor should normally be located close to the cable termination where it exits the enclosure. Where a cable connects two enclosures containing RF sources, a suppressor on each end may be required. For circuits within an enclosure, a position close to the RF is best. However, other locations along the circuit may work as well. Material and U.L. Data API-1 Material, see characteristics and information on page 118 SUPPRESSORS Electronic cables and wires, by virtue of their length-to-width ratios, are perfect natural antennas. In the presence of high speed microprocessor signals, cables will conduct, radiate and/or receive unwanted high frequency interfering signals. Radio interference sources usually radiate their RFI power at frequencies above 30 MHz by way of the main cabling, which acts as an antenna. Control of radio interference can be assured by proper placement of an insertion loss device, such as a ferrite suppressor. Any device used to block an RFI signal between its source and a receiver is an electromagnetic interference (EMI) shield. The measure of this ability to attenuate RFI is shielding effectiveness, "SE", which is expressed in decibels, "dB", the ratio of field strength on one side of the shield to the other side. One of the most versatile and cost effective shielding methods that can be used today is the API Delevan bisected ferrite cable snap assembly. The bisected styling, or familiar clamshell enclosure design offers the ultimate in adaptability. The RF absorbing and material interacts directly with unwanted high frequency energy and dissipates it effectively while allowing data signals to pass unimpeded. Bisected ferrites have a concentrated, homogeneous magnetic structure with high permeability. These are consistently stable at +20C to +60C and provide RF suppression without eddy current losses. AIR GAP EFFECT The air gap in bisected ferrites actually extends current carrying capabilities with only an extremely small reduction in impedance versus solid ferrites of the same size. The gap is magnetically insignificant while it is electrically significant as a discontinuation, thereby accommodating more current. www.delevan.com E-mail: apisales@delevan.com 270 Quaker Rd., East Aurora NY 14052 * Phone 716-652-3600 * Fax 716-652-4814 PAGE 2/ 2002 111 DIMENSIONS IMPEDANCE (OHMS) * BODY TYPE A BODY TYPE B A PA RT Suppressors for Round Cables NU MB ER UN IT S BO DY TY PE Series BF Split Ferrite B C D L 25 MH z 10 0M Hz Inches 0.04; mm 1.0 SERIES BF - FOR ROUND CABLES in. mm in. BF2223 mm in. BF1719 mm in. BF1835 mm in. BF1125-5 mm in. BF1125-3 mm in. BF1429 mm in. BF1225 mm in. BF3024 mm in. BF2125 mm in. BF2123 mm in. BF1835-9 mm in. BF3121 mm BF2930 A A A B B B C C D D D E D 1.16 29.6 0.87 22.3 0.70 17.8 0.70 18.0 0.46 11.7 0.46 11.7 0.57 14.5 0.50 12.8 1.20 30.5 0.84 21.5 0.84 21.5 0.73 18.6 1.24 31.5 1.20 30.5 0.91 23.3 0.76 19.5 0.77 19.7 0.51 13.0 0.51 13.0 0.61 15.7 0.57 14.7 -- -- -- -- -- 0.51 13.0 0.39 10.0 0.25 6.5 0.35 9.0 0.19 5.0 0.13 3.5 0.22 5.6 0.15 4.0 0.45 11.4 0.32 8.15 0.32 8.15 0.35 9.0 0.59 15.0 1.30 33.0 1.28 32.6 1.28 32.5 1.37 35.0 0.98 25.0 0.98 25.0 1.14 29.0 0.98 25.0 0.69 17.7 0.77 19.7 0.66 16.8 1.22 31.0 0.60 15.2 155 257 136 250 171 325 112 172 96 154 139 191 85 157 82 -- 0.94 51 24.0 1.01 50 25.8 0.90 42 23.0 1.38 126 35.2 0.84 41 21.5 146 -- -- -- -- -- -- -- 103 107 94 174 95 Physical Parameters Material and U.L. Data API-1 Material, see characteristics and information on page 118. * Note Impedance is typical, based on 12 turn (4.0") 18 AWG wire. Impedance measurement using HP4191A. BODY TYPE D SUPPRESSORS BODY TYPE C Color Black; Special colors Available for bases on a non-cancellable, non returnable basis C = Cream; W = White; Gr = Grey U.L. Recognized All plastic and adhesive components use U.L. Recognized materials with Flammability Ratings of UL94V-0, UL-510 or UL-746C SEE Z vs. f GRAPHS ON NEXT PAGE BODY TYPE E www.delevan.com E-mail: apisales@delevan.com 270 Quaker Rd., East Aurora NY 14052 * Phone 716-652-3600 * Fax 716-652-4814 PAGE 11/2002 112 Series BF Split Ferrite Suppressors for Round Cables 1000 IMPEDANCE vs. FREQUENCY BF1429 BF2125 1000 BF2123 100 100 10 10 1 1 1 IMPEDANCE (OHMS) 1000 10 100 1000 1 BF3024 10 100 BF2930 1000 1 10 100 1000 1000 BF2223 100 100 10 10 1 1 1 1000 10 100 1000 1 BF1835-9 10 100 BF1719 1000 1 10 100 1000 1000 BF1835 100 10 10 1 1 1 1000 10 100 1000 1 BF1225 10 100 BF1125-5 1000 1 10 100 1000 1000 BF1125-3 100 100 10 10 1 1 1 1000 SUPPRESSORS 100 10 100 1000 1 BF3121 10 100 1000 1 10 100 1000 FREQUENCY (MHz) 100 10 For more detailed graphs, contact factory 1 1 10 100 1000 FREQUENCY (MHz) Additional Information on Preceding Pages Note Impedance is typical, based on 12 turn (4.0") 18 AWG wire. Impedance measurement using HP4191A www.delevan.com E-mail: apisales@delevan.com 270 Quaker Rd., East Aurora NY 14052 * Phone 716-652-3600 * Fax 716-652-4814 PAGE 2/ 2002 113