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如何用网络分析仪检测电缆阻抗?

发布时间:2021-07-02    浏览次数:1151

  如何用网络分析仪检测电缆阻抗?

  您知道用网络分析仪检测电缆阻抗有哪些方法吗?一起来看看吧!!!

  如何用网络分析仪检测电缆阻抗?下面介绍三种基本方法,供大家参考哦!!!

  1.用TDR法测定阻抗:

  时域反射计(TDR)技术是在60年代出现的。这种方法包括产生沿着传输线传播的时间阶跃电压。利用示波器检测阻抗的反射,测量输入电压与反射电压之比,从而计算不连续阻抗。

  2.通过网络分析器测量输入阻抗:

  网状分析器测量测试端口的输入阻抗。一般情况下,这不是特性阻抗。若电缆的电气长度较长,输入阻抗为电缆特性阻抗。在电源线上长的电缆,由于衰减,从远处会看到极小反射的电缆。

  3.用LCR测阻抗:

  低频特性阻抗可以称为“开路短路”法。也可以看作是集总元件的最长电缆,通常是1/10波长电缆上的开路和短路阻抗。用二次测量结果之积的平方根来表示特性阻抗。这种方法的缺点是精度不高。断路和短路测量超过了网络分析仪合理的精度。由于采用电流-电压技术,可以测量较大的阻抗范围,所以用网络分析仪测量开路和短路阻抗。

  需要购买Picoscope示波器,欢迎咨询广州美达克数据科技有限公司