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扫频法具有快速、方便和结果明显的特点,故在电路、电磁场实验中得到越来越广泛的应用。对高频(兆赫)来说,人们往往习惯用集中参数的观点去考虑问题,往往对测试结果迷惑不解,本文用波的传播观点去阐明其测量原理,这将对测量结果的分析提供可靠的依据。一、扫频输出扫频源通过一段长为I、特征阻抗为Z_0的输出线输出扫频电压,在输出线终端开路时,输出线沿线电压分布为把扫频源的输入线和输出线相连接,测量输出线终端(x=0)的电压
Sweep frequency method has the characteristics of fast, convenient and obvious results, so in the circuit, electromagnetic field experiments are more and more widely used. For high frequencies (megahertz), people are often accustomed to taking the problem into account by focusing on the parameters, often puzzling the test results. This paper illustrates the measurement principle using the wave propagation perspective, which provides reliable The basis. First, the swept-frequency output sweep source through a long I, the characteristic impedance of the output line Z_0 output voltage sweep, the output line terminal open circuit, the output voltage along the line to the sweep source of the input line and output line phase Connect and measure the voltage of the output line terminal (x = 0)