通道间延迟时间差的测量不确定度

介绍了用正弦波拟合法评价测量系统通道间延迟时间差不确定度的分析和评定过程。讨论了几个主要的不确定度来源，包括信号源误差、采集序列的谐波失真、噪声及非谐波失真、抖动、软件拟合运算误差等。结合一个实例，给出了通道间延迟时间差测量不确定度的评定结果。该过程可用于相应计量标准的不确定度分析与评定。

The Measurement Uncertainty of Delay Between Channels

The uncertainty of evaluation results of delay between channels of linear measurement system by using the least mean square four-parameter sine-wave curve-fit method is described. Some principal error sources of delay between channels are discussed, including the signal frequency errors, the harmonic distortion of sampling serials, the noise and the spurious distortion, the jitter of the signal periods in sampling serials, the calculation errors of software and some others. In an example of experiment, the analysis and uncertainty evaluation results of delay between channels by using the method are presented. The courses and con- clusion of analysis and uncertainty evaluation of delay between channels can he applied to the uncertainty evaluation of measurement standards of delay between channels.