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Amplitude Frequency Response Measurement: A Simple Technique

机译:幅频响应测量:一种简单的技术

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摘要

A simple method is described to combine a modern function generator and a digital oscilloscope to configure a setup that can directly measure the amplitude frequency response of a system. This is achieved by synchronously triggering both instruments, with the function generator operated in the “Linear-Sweep” frequency mode, while the oscilloscope is operated in the “Envelope” acquisition mode. Under these conditions, the acquired envelopes directly correspond to the (input and output signal) spectra, whose ratio yields the amplitude frequency response. The method is easy to configure, automatic, time-efficient, and does not require any external control or interface or programming. This method is ideally suited to impart hands-on experience in sweep frequency response measurements, demonstrate resonance phenomenon in transformer windings, explain the working principle of an impedance analyzer, practically exhibit properties of network functions, and so on. The proposed method is an inexpensive alternative to existing commercial equipment meant for this job and is also an effective teaching aid. Details of its implementation, along with some practical measurements on an actual transformer, are presented.
机译:描述了一种简单的方法,将现代函数发生器和数字示波器相结合,以配置可以直接测量系统的幅度频率响应的设置。这是通过同步触发两台仪器来实现的,函数发生器以“线性扫描”频率模式运行,而示波器以“包络”采集模式运行。在这些条件下,所获取的包络直接对应于(输入和输出信号)频谱,频谱之比产生幅度频率响应。该方法易于配置,自动,省时,并且不需要任何外部控制或接口或编程。此方法非常适合在扫描频率响应测量中提供动手经验,演示变压器绕组中的谐振现象,解释阻抗分析仪的工作原理,实际展示网络功能的特性等。所提出的方法是用于该工作的现有商业设备的廉价替代,并且还是有效的教学辅助工具。介绍了其实现的详细信息,以及对实际变压器的一些实际测量。

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