数字存储示波器上升时间的测量不确定度评定

摘要

The uncertainty of evaluation results of transient duration (rise time) of digital storage oscilloscope (DSO) by the step input method is described, including the courses of analysis and evaluation of uncertainty of it. Some error sources of rise time evaluation are discussed, including the signal rise time & its errors, the time base errors of DSO, the amplitude measuring errors of DSO, the effect of the slope of the curve, the repeatability errors, and the others. The uncertainty model of rise time of DSO is given, and several main methods about decreasing the rise time evaluation errors and evaluation uncertainty are proposed. Combining with an example of experiment, the analysis and uncertainty evaluation results of rise time with the method is presented.%介绍了用阶跃响应法评价数字存储示波器上升时间的测量不确定度分析与评定过程.讨论了主要的不确定度来源,包括信号源上升时间及其误差、示波器时基误差、示波器幅度测量误差、上升时间区间端点处波形曲线随变化率的影响,以及测量重复性等,给出了不确定度模型,以及减小不确定度的主要措施,并结合实例,给出了上升时间的不确定度评定结果.