Noise suppression in portable battery internal resistance measuring instrument
Rong Deng · Chinese Journal of Power Sources · 2013
In this paper,one kind of battery internal resistance measuring instrument was designed based on AC proportion method.By analysis of noise that impacted on measurement accuracy,some technical measures,such as preamplifier,lock-in amplifier and double integration AD converter,were used to suppress noise and some experiments also have been done.The experiment results show that the noise suppression methods proposed in the paper can effectively increase signal-to-noise ratio and resolution ratio in weak signal detection and achieve accurate measuring of battery internal resistance.