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，或者积分器的Ki*Error*dt值趋向于0的情况。例如，如果有这样-一个非常缓慢的过程，预计PV值会用10小时或者36000秒钟的时间到达最终值的63%时，采样时间应大于或等于40秒。
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