This paper describes the application and construction of signal sample and hold (S/H) circuit to facilitate data acquisition process using the Keithley Metrabyte DAS 1802HC. A basic tomographic system consists of sensors, signal conditioning circuit, data acquisition system and the creation of suitable computer software to display the reconstructed image obtained from pipeline. The analogue signals, which are also the data needed for image reconstruction have to be managed properly, in terms of minimizing the data transfer time from the signal conditioning circuit to the data acquisition card. Besides having a “DC memory” characteristic which can easily be converted into digital format, the sample and hold circuit also has the ability of sampling a segment of waveform and holding it until the proper timing for conversion of the required control signal. In order to generate the relevant signals to control both the signal sample and hold circuit and the data acquisition card, the PIC microcontroller is being used. With the combination of signal sample and hold circuit and microcontroller, transition of analogue signals to the data acquisition system can be performed efficiently
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机译：本文介绍了使用Keithley Metrabyte DAS 1802HC来简化数据采集过程的信号采样和保持（S / H）电路的应用和结构。一个基本的层析成像系统包括传感器，信号调节电路，数据采集系统以及合适的计算机软件的创建，以显示从管道中获得的重建图像。就最小化从信号调节电路到数据采集卡的数据传输时间而言，模拟信号（也是图像重建所需的数据）必须妥善管理。除了具有可以轻松转换为数字格式的“ DC存储器”特性外，采样和保持电路还具有采样一段波形并将其保持到转换所需控制信号的适当时机的能力。为了生成相关信号以控制信号采样和保持电路以及数据采集卡，正在使用PIC微控制器。结合信号采样和保持电路以及微控制器，可以有效地将模拟信号转换为数据采集系统
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