频率测量vi，包括ESTI、比例法、多项式逼近法、多周期平均计数法、仿真信号源、能量矩平衡、频率跟踪、三点法-Frequency measurement vi, including ESTI, ratio method, polynomial approximation method, average more cycle counting method, the simulation signal source, energy moment balance, frequency trackin

数据实时采集，实现数据的动态记录，比如平均周期，峰峰值等-Real time data acquisition, dynamic recording of data, such as the average cycle, peak value, etc.