基于MSP430准同步采样算法的数字电压表设计

Design of digital voltmeter based on MSP430 quasi-synchronous sampling algorithm

在采样数字测量装置中普遍采用同步采样及其数据处理方法测量周期信号的电参数,然而实现绝对的同步采样是很困难的,因为采样中任何一个微小的不同步误差都带来较大的测量误差。因此,减小不同步误差已经成为基于同步采样原理的测量装置获得高精度的一个关键因素。本文介绍了一种新的采样处理简单算法,即准同步采样算法。该算法最突出的特点是不要求采样周期与信号周期严格同步。由于不受非同步误差影响,简化了传统FFT算法,节省硬件资源。最后,将准同步采样算法应用于基于MSP430单片机的数字电压表的软件核心设计,进行算法最终实现,经测试结果证实了准同步采样算法的实用性。

In sampling digital measuring device of the synchronous sampling and data processing methods widely used in measuring the electrical parameters of periodic signal,but it is difficult to achieve absolute synchronous sampling,because samples in any tiny sync error bring bigger error of measurement.Therefore,reducing the non-synchronization error has become a key factor for the accuracy of the measurement device based on the principle of synchronous sampling.This paper introduces a new sampling processing simple algorithm, namely quasi-synchronous sampling algorithm.The most prominent feature of this algorithm is that the sampling period and signal cycle are not strictly synchronized.The traditional FFT algorithm is simplified and the hardware resources are saved due to the non-synchronous error.Finally,quasi synchronous sampling algorithm was applied to digital voltage meter based on msp430 single chip microcomputer software core design,algorithm finally,the practical test results confirmed that the quasi synchronous sampling algorithm.