采样时将不应大于总计时间的1/10(最差的情况下也不能大于总计时间的1/5)。例如，如果预计PV值会用2秒钟的时间到达最终值的2/3，采样时间应小于0.2秒，最差的情况下也不能大于0.4秒。另一方面，采样时间也不能太小，例如小于总计时间的1/1000
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