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維創域貿易有限公司蘇州分公司  徐先生 18051732733 051268755133 長期供應Fair-Rite全系產品
視頻線等線材上，可有效屏蔽EMI/RFI干擾，隔離或濾除電源連接導線竄入設備電路的高頻噪聲脈沖干擾，如用在音視頻電器電源線上能進一步提升音頻及視頻質量，無疑是音響發燒友的選擇。用在音頻線，視頻線等各種發燒線材上，其增加音響系統純凈度，降低訊號線被電源線雜訊干擾.
磁環
電子設備輻射和泄漏的電磁波不僅嚴重干擾其他電子設備正常工作，導致設備功能紊亂、傳輸錯誤、還威脅著人類的健康與安全，危害非常大。因此降低電子設備的電磁干擾(EMI)已經是必須考慮的問題。

吸收磁環，又稱鐵氧體磁環，簡稱磁環。它是電子電路中常用的抗干擾元件，對于高頻噪聲有很好的抑制作用，一般使用鐵氧體材料（Mn－Zn）制成。

磁環在不同的頻率下有不同的阻抗特性，一般在低頻時阻抗很小，當信號頻率升高磁環表現的阻抗急劇升高。

大家都知道，信號頻率越高，越容易輻射出去（要買優質的電腦機箱也是要減小電磁泄漏），而一般的信號線都是沒有屏蔽層的，那么這些信號線就成了很 好的天線，接收周圍環境中各種雜亂的高頻信號，而這些信號疊加在本來傳輸的信號上，甚至會改變原來傳輸的有用信號。那么在磁環作用下，使正常有用的信號很好的通過，又能很好的抑制高頻干擾信號的通過，而且成本低廉。

所以大家在顯示器信號線，USB連接線，甚至高檔鍵盤、鼠標上看的塑料疙瘩型的一體式磁環就不足為奇了。

磁環的匝數選擇

將整束電纜穿過一個鐵氧體磁環就構成了一個共模扼流圈，根據需要，也可以將電纜在磁環上面繞幾匝。匝數越多，對頻率較低的干擾抑制效果越好，而對頻率較高的噪聲抑制作用較弱。在實際工程中，要根據干擾電流的頻率特點來調整磁環的匝數。通常當干擾信號的頻帶較寬時，可在電纜上套兩個磁環，每個磁環繞不同的匝數，這樣可以同時抑制高頻干擾和低頻干擾。從共模扼流圈作用的機理上看，其阻抗越大，對干擾抑制效果越明顯。而共模扼流圈的阻抗來自共模電感Lcm=jwLcm，從公式中不難看出，對于一定頻率的噪聲，磁環的電感越大越好。但實際情況并非如此，因為實際的磁環上還有寄生電容，它的存在方式是與電感并聯。當遇到高頻干擾信號時，電容的容抗較小，將磁環的電感短路，從而使共模扼流圈失去作用
 
 

Item Brand Mftrs No Description
1 FAIR RITE 199000005 Expanded Cable and Connector EMI Suppres
2 FAIR RITE 199000017 EMI SUPRESSION EVALUATION KITS
3 FAIR RITE 199000018 Product Description:Fair-Rite Engineerin
4 FAIR RITE 199000034 EMI SUPRESSION EVALUATION KITS
5 FAIR RITE 199001401 EMI SUPRESSION EVALUATION KITS
6 FAIR RITE 431164181 31 SNAP-IT ROUND CABLE SUPPRESSION CORE
7 FAIR RITE 431164281 FERRITES IMPEDANCE:310OHMS; SIZE/DIMENSI
8 FAIR RITE 431164951 FERRITE CORE IMPEDANCE:280OHM; SIZE/DIME
9 FAIR RITE 431167281 Ferrites; Impedance: 240Ohms; Size/Dimen
10 FAIR RITE 431173551 Ferrites; Impedance: 220Ohms; Size/Dimen
11 FAIR RITE 443163951 EMI SUPRESSION CORES WITH CASES
12 FAIR RITE 443164151 Round Cable Snap-Its, Cable Diameter-.50
13 FAIR RITE 443164251 FERRITE ROUND CORE ((NW))
14 FAIR RITE 443167251 EMI SUPRESSION CORES WITH CASES
15 FAIR RITE 443625006 EMI SUPRESSION CORES WITH CASES
16 FAIR RITE 444164181 44 SNAP-IT ROUND CABLE SUPPRESSION CORE
17 FAIR RITE 444164281 44 SNAP-IT ROUND CABLE SUPPRESSION CORE
18 FAIR RITE 444164951 Round Cable Core, EMI Suppression, with
19 FAIR RITE 444167281 EMI SUPRESSION CORES WITH CASES
20 FAIR RITE 444173551 Ferrite Core Impedance:94Ohm
21 FAIR RITE 444176451 FERRITE CORE IMPEDANCE:175OHM
22 FAIR RITE 2631102002 ROUND CABLE EMI SUPPRESSION CORES
23 FAIR RITE 2631665702 Ferrite Core Impedance:225Ohm
24 FAIR RITE 2643000101 Ferrites; Impedance: 40Ohms; Resistance:
25 FAIR RITE 2643000801 Shield Bead, EMI, 92 ohm Impedance at 10
26 FAIR RITE 2643000801 Shield Bead, EMI, 92 ohm Impedance at 10
27 FAIR RITE 2643001501 Ferrites Resistance:35Ohms
28 FAIR RITE 2643021801 Ferrite Bead Resistance:131Ohm
29 FAIR RITE 2643102002 STATIC PROTECTION ((NW))
30 FAIR RITE 2643102402 43 EMI Suppression Bead
31 FAIR RITE 2643164251 43 SHIELD BEAD
32 FAIR RITE 2643166651 Flat cable EMI suppression core, (HxWxD
33 FAIR RITE 2643166851 Flat cable EMI suppression core, (HxWxD
34 FAIR RITE 2643167851 43 Flat Cable EMI Suppression Core
35 FAIR RITE 2643169552 43 Flat Cable EMI Suppression Core
36 FAIR RITE 2643375002 EMI SHIELD BEADS
37 FAIR RITE 2643480002 Round cable EMI suppression core, 1 in.
38 FAIR RITE 2643540002 ROUND CABLE EMI SUPPRESSION CORES
39 FAIR RITE 2643540402 43 Round Cable EMI Suppression Core
40 FAIR RITE 2643625002 Ferrite, E Core
41 FAIR RITE 2643625102 43 Round Cable EMI Suppression Core
42 FAIR RITE 2643626302 43 Round Cable EMI Suppression Core
43 FAIR RITE 2643626402 43 ROUND CABLE EMI SUPPRESSION CORE
44 FAIR RITE 2643626502 ROUND CABLE EMI SUPPRESSION CORES
45 FAIR RITE 2643803802 ROUND CABLE EMI SUPPRESSION CORES
46 FAIR RITE 2643804502 ROUND CABLE EMI SUPPRESSION CORES
47 FAIR RITE 2643806402 ROUND CABLE EMI SUPPRESSION CORES

48 FAIR RITE 2673000101 EMI suppression bead1 

1 FAIR RITE 199000005 
2 FAIR RITE 199000017 
3 FAIR RITE 199000018 
4 FAIR RITE 199000034 
5 FAIR RITE 199001401 
6 FAIR RITE 431164181 
7 FAIR RITE 431164281 
8 FAIR RITE 431164951 
9 FAIR RITE 431167281 
10 FAIR RITE 431173551 
11 FAIR RITE 443163951 
12 FAIR RITE 443164151 
13 FAIR RITE 443164251 
14 FAIR RITE 443167251 
15 FAIR RITE 443625006 
16 FAIR RITE 444164181 
17 FAIR RITE 444164281 
18 FAIR RITE 444164951 
19 FAIR RITE 444167281 
20 FAIR RITE 444173551 
21 FAIR RITE 444176451 
22 FAIR RITE 2631102002 
23 FAIR RITE 2631665702 
24 FAIR RITE 2643000101 
25 FAIR RITE 2643000801 
26 FAIR RITE 2643000801 
27 FAIR RITE 2643001501 
28 FAIR RITE 2643021801 
29 FAIR RITE 2643102002 
30 FAIR RITE 2643102402 
31 FAIR RITE 2643164251 
32 FAIR RITE 2643166651 
33 FAIR RITE 2643166851 
34 FAIR RITE 2643167851 
35 FAIR RITE 2643169552 
36 FAIR RITE 2643375002 
37 FAIR RITE 2643480002 
38 FAIR RITE 2643540002 
39 FAIR RITE 2643540402 
40 FAIR RITE 2643625002 
41 FAIR RITE 2643625102 
42 FAIR RITE 2643626302 
43 FAIR RITE 2643626402 
45 FAIR RITE 2643803802 
46 FAIR RITE 2643804502 
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74 FAIR RITE 2873000202 
75 FAIR RITE 2873002402 
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77 FAIR RITE 2943666681 
78 FAIR RITE 2944666661 
79 FAIR RITE 2944777741 
80 FAIR RITE 2961666671 
81 FAIR RITE 0443 164 051 
82 FAIR RITE 0443 166 651 
83 FAIR RITE 0443 167 251 
84 FAIR RITE 0443163951B 
85 FAIR RITE 0443164051B 
86 FAIR RITE 0443164151B 
87 FAIR RITE 0443164251B 
88 FAIR RITE 0443166651B 
89 FAIR RITE 0443167251B 
90 FAIR RITE 0443625006B 
91 FAIR RITE 0443665806B 
92 FAIR RITE 0443800506B 
93 FAIR RITE 0443806406B 
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98 FAIR RITE 2508051217Z0 
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109 FAIR RITE 264 3665 702 
110 FAIR RITE 2643000101C 
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115 FAIR RITE 2643002402C 
116 FAIR RITE 2643102002B 
117 FAIR RITE 2643540002B 
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121 FAIR RITE 2643803802B 
122 FAIR RITE 2643804502B 
123 FAIR RITE 2673000101C 
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125 FAIR RITE 2743001112H 
126 FAIR RITE 2743003112H 
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128 FAIR RITE 2743019447H 
129 FAIR RITE 2743021447H 
130 FAIR RITE 2743021447-TR 
131 FAIR RITE 2944666631/G1 
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