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一、概述本文介绍一种多输入通道数据采集控制器,它能控制最多至16台普通盒式录音机,分别对16个采样点进行模拟信号的数据采样.采样频率不超过每秒200次,采集到的数据用周期调制法,记录在盒式磁带上,供计算机处理.此设备适用于机械结构分析、工程结构分析、地震勘探、医疗数据等方面的低频信号数据采集.本控制器(见图1)由一块16通道的模数转换大规模集成电路ADC 0817(或ADC 0816)和74 LS系列的中、小规模集成电路构成.控制器以统一的采样频率(可调),对16个采样点循环采样.由于模数转换需占用一定的时间,相邻两个采样点上的采样时间约有100微秒的延迟.为
I. INTRODUCTION This paper introduces a multi-input channel data acquisition controller which can control up to 16 general cassette recorders and sample the analog signals of 16 sampling points respectively, the sampling frequency does not exceed 200 times per second, and the acquisition The data to the use of periodic modulation method, recorded on a tape cartridge for computer processing.This device is suitable for mechanical structure analysis, engineering structure analysis, seismic exploration, medical data and other aspects of low-frequency signal data acquisition. The controller (see Figure 1) consists of a 16-channel A / D ADC ADC 0817 (or ADC 0816) and 74 LS series of medium- and small-scale integrated circuits that operate at a uniform sampling rate (adjustable) for 16 samples Point cycle sampling. Because analog-digital conversion takes a certain amount of time, the sampling time of two adjacent sampling points is about 100 microseconds.