It is well-known that the sampling period of some Da ta Acquisition Syst ems(DAS), if not short enough, may limit the evaluation of their transient perfo rm ance.

• 数据采集系统的采样周期是有下限的，即其采集速率不可能无限高，这在实际应用中常常限制了其瞬态响应特性的获得。