如果sample_interval参数被忽略，则使用默认抽样时间间隔，1秒。
If the sample_interval parameter is omitted, the default sample interval is one second.
通过采用这种算法可将定时误差缩小到只有抽样时间间隔的一半。
Through adopting this algorithm the timing error is shortened to a half of the sample time interval.
要使用控制图就要求工程师或分析员为控制图选择样本容量、抽样频率(抽样时间隔或抽样区间)和控制限。
The use of a control chart requires that the engineer or analyst select a sample size, a sampling frequency or interval between samples, and the control limits for chart.
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