新闻资讯
推荐资讯
推荐产品
当前位置：网站首页 > 新闻资讯 > 行业资讯
行业资讯
  • 场强仪工作原理
  • 本站编辑:建德市梅城高频电磁仪器厂发布日期：2019-04-11 21:52
由CATV终端输入的5~860MHz的射频信号由测试口进入可调的衰减网络调整，衰减网络由单片机控制。当信号场强值为20~80dBμV，衰减网络自动置于直通状态;当为80~120dBμV时，衰减网络自动置于衰减状态。
输入信号经可变衰减器后，进入混频器变频将为中频信号，经滤波、检波后，测量出数字信号的最大数，再送入A/D变换器变为数字信号，由单片机根据公式计算出结果进行处理并显示记录。

The radio frequency signal of 5 ~ 860 MHz entered by the CATV terminal enters the adjustable attenuation network adjustment from the test port, and the attenuation network is controlled by a single chip microcomputer. When the signal field strength is 20 ~ 80 dBμV, the attenuation network is automatically placed in a straight state; When it is 80 ~ 120 dBμV, the attenuation network is automatically placed in the attenuation state.
After the input signal passes through the variable attenuator, the frequency conversion into the mixer will be an intermediate frequency signal. After filtering and checking, the maximum number of digital signals will be measured and sent to the A/D converter to become a digital signal. The results are processed and recorded by the single chip computer according to the formula.