数据采集系统通道间延迟时间差的精确评价

The Evaluation of Channel Delay of Data Acquisition Systems

本文介绍了数据采集系统通道间延迟时间差的一种简单实用的精确评价方法，即加数字滤波器的正弦波拟合法。设计实现了单频数字滤波器的时域实现过程及频域表达式，讨论了评价过程的误差来源，以及减小其评价误差的几种对策；同时，给出了评价过程的几个典型实验结果。

This paper presents a simple and useful evaluation method for the delay of channels of data acquisition system. It utilizes the sinusoid curvefit method with the special digital filter. The single frequency digital filter has been designed and realized, and its frequency domain transfer function is given out. The error sources are described, and finally some methods to reduce the uncertainty of calibration results are discussed.