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关于这个问题，我们首先要弄清楚干扰源。 从干扰成因上分析，我们将主要干扰源划定在电梯机房。 电梯机房直接对我们系统干扰有哪些呢？ 1：电梯的拽引电机，交流型要比直流型严重； 2：电梯在启动运行、加速过程

镜头知识1.镜头的种类(根据应用场合分类) · 广角镜头：视角90度以上，观察范围较大，近处图像有变形。 · 标准镜头：视角30度左右，使用范围较广。 · 长焦镜头：视角20度以内，焦距可达几十毫米或上

监控系统中视频干扰的现象及解决方法 闭路电视监控系统在各领域中的应用越来越多，在不同环境、不同安装条件和不同施工人员下，由于线路、电气环境的不同，或是在施工中疏忽，容易引发各种不同的干扰。这些干扰就会

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