由经验判断，确定两次采样允许的最大偏差A，每次检测新值时判断：如果本次的值与上次的值

<=A,则有效，如果大于A,则本次值无效，放弃，用上次的值，代替。

-Judging by experience, to determine the maximum permissible deviation of two samples A, each time a new value test to determine: If this value with the previous value < = A, then the effective, if greater than A, then this value is invalid, abandoned with the last value, instead.