说明：  绝对平均值是计算波形指标与脉冲指标的重要参数。本文件中将其独立制作成了一个子VI，方便labview程序调用。
(The absolute mean value is an important parameter to calculate the waveform index and pulse index. This document will be independently produced into a sub VI, to facilitate the LabVIEW program call.)