论文部分内容阅读
绝大部分多通道数据探测系统通常都使用一种顺序数据转换方式。因而,各模拟信号的采样时刻是分开的。然而,如果想得到一批数据来进行系统研究或要对大批模拟通道进行快速数据转换时,常常希望能获得同步采样。本文提出一种廉价高效的技术,即采用微计算机控制的八通道同步数据探测系统。这儿使用了一单板微计算机 SDK-85,所有完成数据转换和存贮数值到 RAM 中的软件程序的执行仅占用 CPU 时间93毫微秒。由于各 A/D 转换器(ADC)工作在存贮器映象方式,故该系统的模拟信号通道几乎可无限地扩展。该系统也可处理12位分辨率的 ADC。
Most multichannel data detection systems usually use a sequential data conversion method. Therefore, the sampling times of the analog signals are separated. However, if you want to get a batch of data to do a systematic study or want to quickly convert a large number of analog channels, you often want to get synchronized samples. This paper presents a cheap and efficient technology that uses micro-computer-controlled eight-channel synchronous data detection system. Here, a single-board microcomputer, the SDK-85, is used. All software programs that perform data conversion and storing values into RAM take only 93 ns of CPU time. Since each A / D converter (ADC) operates in memory-mapped mode, the system’s analog signal path extends almost indefinitely. The system also handles 12-bit resolution ADCs.