已有不少文章介绍了在普通示波器(单踪或双踪)上增加一块附加线路装置以实现多路信号的同时测试,但往往存在下列问题:1.示波器一次扫描中连续显示几路输入信号;2.不能准确的观测各信号间的相位关系;3.输出与输入无确定的定量关系;4.工作可靠性差(当嫁接某路输入信号的直流电平为极限值时很易烧坏器件);5.线路复杂造价高。笔者为了教学实验与科研的需要对此问题进行了研究,设计调试出一种对多路输入信号参数可测性强、工作可靠、线路简单的附加线路,把它与单踪示波器(例SBM-10A)配合后可以准确地进行模拟与数字电路(或系统)的实验与测试。一、测试原理测试原理见图1。图中各方框的作用如下: 地址编码器:相应于每一路输入产生一代码,以便多路开关根据代码的不同选择一路输入信号。实际上地址编码器为一计数器,它对示波器的输出脉冲(与扫描锯齿波同周期,且下降沿对应扫描的起始时刻,上升沿对应回扫)在回扫时刻进行计数,计数器的状态即为 Many articles have been introduced in the ordinary oscilloscope (single track or double track) to add an additional line device in order to achieve the simultaneous testing of multiple signals, but often the following problems: 1 oscilloscope scan showed a few consecutive input signal ; 2 can not accurately observe the phase relationship between the signals; 3 output and input no quantitative relationship; 4 poor work reliability (when grafting a DC signal input signal is very easy to burn out the device) ; 5 high complexity lines. In order to meet the needs of teaching experiment and scientific research, the author studied the problem and designed and debugged a kind of additional circuit which has strong testability, reliable working and simple circuit for multiple input signal parameters. It is connected with a single trace oscilloscope (eg SBM- 10A) with the analog and digital circuits (or system) can accurately experiment and test. First, the test principle Test principle shown in Figure 1. The function of the boxes in the figure is as follows: Address Encoder: Generate a code corresponding to each input, so that the multiplexer can select one input signal according to different codes. In fact, the address encoder is a counter that counts the output pulse of the oscilloscope (the same period as the scanning sawtooth wave and the rising edge corresponding to the start time of the scanning corresponding to the falling edge) at the flyback time. The state of the counter for