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布线技巧:屏蔽性能指标的含义

Jun 07, 2016 pm 03:23 PM
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欢迎进入网络技术社区论坛,与200万技术人员互动交流 >>进入 1.表面转移阻抗(Surface Transfer Impedance) 按IEC61196-1测试同轴电缆的方法,测试带屏蔽的平衡电缆,短路8根芯线后用50Ω信号源激励。被测试线长1米,测试频率30MHz,频率越高,线长越短导体

欢迎进入网络技术社区论坛,与200万技术人员互动交流 >>进入

    1.表面转移阻抗(Surface Transfer Impedance)

    按IEC61196-1测试同轴电缆的方法,测试带屏蔽的平衡电缆,短路8根芯线后用50Ω信号源激励。被测试线长1米,测试频率30MHz,频率越高,线长越短导体表面转移阻抗。主要用于评估连接硬件的屏蔽效率,其实测值不超过以下计算值。
    ZTcable=37+4f+4f1/2+5f1/3
    ZTcable:表面转移阻抗,单位mΩ/m
    f:信号频率,单位MHz

    2.转移阻抗(Transfer Impedance)
    转移阻抗与屏蔽电缆和连接硬件的屏蔽效率相关,其数值可通过实验室高频密封箱测量屏蔽插入损耗,计算得出。

   

布线技巧:屏蔽性能指标的含义

    
    Ri1=Ri2=50Ω――网络分析仪特性阻抗
    R1=50Ω――馈电电阻
    R2=50Ω――终端电阻
    U1=信号发射电压(V)
    U2=信号接收电压(V)
    Uc=被测设备两端电压
    Zcond=连接器特性阻抗(Ω)
    Zt=转移阻抗(Ω)
    Zt=1/l电缆长度?Ri1/Ri2?(R2+ Ri2)?U2/ U1=100/l电缆长度?U2/ U1
    由于屏蔽插入损耗(αs)为20?lg (U2/ U1)dB,转移阻抗(Zt)也可以表示为:
    Zt=100?10α/20(Ω)

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布线技巧:屏蔽性能指标的含义

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