维创域贸易有限公司苏州分公司  徐先生 18051732733 051268755133 长期供应Fair-Rite全系产品
视频线等线材上，可有效屏蔽EMI/RFI干扰，隔离或滤除电源连接导线窜入设备电路的高频噪声脉冲干扰，如用在音视频电器电源线上能进一步提升音频及视频质量，无疑是音响发烧友的选择。用在音频线，视频线等各种发烧线材上，其增加音响系统纯净度，降低讯号线被电源线杂讯干扰.
磁环
电子设备辐射和泄漏的电磁波不仅严重干扰其他电子设备正常工作，导致设备功能紊乱、传输错误、还威胁着人类的健康与安全，危害非常大。因此降低电子设备的电磁干扰(EMI)已经是必须考虑的问题。

吸收磁环，又称铁氧体磁环，简称磁环。它是电子电路中常用的抗干扰元件，对于高频噪声有很好的抑制作用，一般使用铁氧体材料（Mn－Zn）制成。

磁环在不同的频率下有不同的阻抗特性，一般在低频时阻抗很小，当信号频率升高磁环表现的阻抗急剧升高。

大家都知道，信号频率越高，越容易辐射出去（要买优质的电脑机箱也是要减小电磁泄漏），而一般的信号线都是没有屏蔽层的，那么这些信号线就成了很 好的天线，接收周围环境中各种杂乱的高频信号，而这些信号叠加在本来传输的信号上，甚至会改变原来传输的有用信号。那么在磁环作用下，使正常有用的信号很好的通过，又能很好的抑制高频干扰信号的通过，而且成本低廉。

所以大家在显示器信号线，USB连接线，甚至高档键盘、鼠标上看的塑料疙瘩型的一体式磁环就不足为奇了。

磁环的匝数选择

将整束电缆穿过一个铁氧体磁环就构成了一个共模扼流圈，根据需要，也可以将电缆在磁环上面绕几匝。匝数越多，对频率较低的干扰抑制效果越好，而对频率较高的噪声抑制作用较弱。在实际工程中，要根据干扰电流的频率特点来调整磁环的匝数。通常当干扰信号的频带较宽时，可在电缆上套两个磁环，每个磁环绕不同的匝数，这样可以同时抑制高频干扰和低频干扰。从共模扼流圈作用的机理上看，其阻抗越大，对干扰抑制效果越明显。而共模扼流圈的阻抗来自共模电感Lcm=jwLcm，从公式中不难看出，对于一定频率的噪声，磁环的电感越大越好。但实际情况并非如此，因为实际的磁环上还有寄生电容，它的存在方式是与电感并联。当遇到高频干扰信号时，电容的容抗较小，将磁环的电感短路，从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 
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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 
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110 FAIR RITE 2643000101C 
111 FAIR RITE 2643000301/F1 
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113 FAIR RITE 2643000801C 
114 FAIR RITE 2643002402/E1 
115 FAIR RITE 2643002402C 
116 FAIR RITE 2643102002B 
117 FAIR RITE 2643540002B 
118 FAIR RITE 2643665702B 
119 FAIR RITE 2643801002B 
120 FAIR RITE 2643802702B 
121 FAIR RITE 2643803802B 
122 FAIR RITE 2643804502B 
123 FAIR RITE 2673000101C 
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125 FAIR RITE 2743001112H 
126 FAIR RITE 2743003112H 
127 FAIR RITE 2743009112H 
128 FAIR RITE 2743019447H 
129 FAIR RITE 2743021447H 
130 FAIR RITE 2743021447-TR 
131 FAIR RITE 2944666631/G1 
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