【摘要】 由文氏桥振荡器获得频率为f的正弦波。经相应的信号调理电路,分别获得频率为f、2f和3f且可移相的正弦波;用示波器显示频率比分别为1:1、1:2和1:3合成的李萨如图。频率为f、2f和3f的正弦波系来自同一信号源的相关信号,所演示图形稳定、效果好。新型演示仪解决了传统方法合成李萨如图图形滚动问题。更多还原

【Abstract】 A sine wave whose frequency is f is obtained from the Wien bridge oscillator.Through corresponding signal conditioning circuits,phase-shifted sine waves with frequencies being f,2f and 3f are obtained respectively.The synthesis Lissajous figure whose frequency ratios are 1:1,1:2 and 1:3 can be showed by oscilloscope.Frequencies f,2f and 3f sine wave signal are from the same department of the relevant signals and the presentation graphics are stable with good effect.The new demonstrator solves the synthesis Lissajous figure graphics scrolling problem arising from the traditional method.更多还原