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用微机对实时信号进行采集其速度受到很多因素的限制。要实现对变化较快的信号的采集,尤其是存贮,用一般办法难以实现。本文叙述了在TP—801单板机上扩充一块Z80—DMA(直接存贮器存取部件),以及A/D、D/A电路,高速地对信号采样、存贮和恢复。作为一项应用,将它同一台普通示波器相结合构成了一台记忆示波器。其采样频率由单板机键盘设定,最高可达40千赫。最低1千赫。采样点数为512点(可以任意扩展,视内存大小而定)。既可由人工触发,又可由被测信号自身触发。触发前同普通示波器一样地工作,一经触发就连续显示出在触发后被记忆下来的波形。
Real-time signal acquisition using a microcomputer its speed is limited by many factors. To achieve rapid changes in signal acquisition, especially storage, with the general approach is difficult to achieve. This article describes the expansion of a Z80-DMA (Direct Memory Access Unit) and A / D, D / A circuits on the TP-801 SBC to sample, store and recover signals at high speed. As an application, it is combined with a common oscilloscope to form a memory oscilloscope. The sampling frequency set by the board keyboard, up to 40 kHz. 1 kilohertz minimum. Sampling points for 512 points (you can arbitrarily expand, depending on the size of the memory). It can be triggered manually or by the signal under test itself. Before the trigger, it works the same as a normal oscilloscope, and once triggered, continuously displays the waveform that is memorized after the trigger.