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.
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。
Then, the limitations of the adaptive sampling interval technique are analyzed by taking into account the requirement for high frequency resynchronization.
然后，结合数据再同步的需求分析了频率自适应采样方法在高密度的相量同步情况下的局限性；
This method adjusts sampling interval to trail after the power system frequency while harmonics analyzing, so that this method greatly reduces the spectrum leakage.
采用此算法可实时跟踪电网频率波动，极大地减小频谱泄漏提高谐波测量精度。
This method adjusts sampling interval to trail after the power system frequency while harmonics analyzing, so that this method greatly reduces the spectrum leakage.
采用此算法可实时跟踪电网频率波动，极大地减小频谱泄漏提高谐波测量精度。
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