多种检波方式的智能电压表设计与实现

System design of a smart voltmeter with multi-demodulations

所设计的智能电压表采用3种检波方式,实现了对直流电压和任意周期性交流信号其峰值、有效值和平均值的测量,且检测过程实现量程切换自动化。在软件中加入去极值平均滤波算法,滤除了明显的毛刺并抑制了小幅度随机噪声,提高了测量准确度。该表的可测信号频率范围为1 Hz^1 MHz,幅度范围为0.1~10V,测量结果的真值相对误差小于±1%。此电压表具有体积小、重量轻和便于携带的优点,在电压信号测量中极大地扩充了市面数字万用表的功能。

Based on three demodulations ,this smart voltmeter is capable of the automatic measurement of peak value , effective value and average value of direct voltage and any periodic AC signals .By applying excluding extreme value averaging filter algorithm ,the voltmeter provides better resistance to burrs and low amplitude random noise ,which as a result ,improved the systematic accuracy .The voltmeter input frequency is ranging from 1 Hz to 1 M Hz ,with an amplitude range from 0 .1 V to 10 V and a relative error less than ± 1% .With its tiny size and light weight ,this voltmeter drastically promoted the function upgrade of digital multimeter products on the market .