Research on improving the accuracy of frequency meter based on equal precision

This paper systematically describes the development process of precision improvement technology for equal precision frequency meters, analyzes the source of error and existing solutions, and proposes an innovative scheme based on adaptive noise reduction. By reviewing the evolution of frequency measurement technology from simple counting to high-precision digitization, it is clear that quantization error, time base error and noise interference are the core factors that limit the accuracy. Although the existing methods improve the accuracy by improving the clock source, optimization algorithm and synchronous gate circuit design, they still face the problem of insufficient adaptability in dynamic noise environment. Therefore, this study proposes to introduce adaptive noise reduction technology into the design of equal precision frequency meter, combining LMS algorithm and dynamic adjustment factor to dynamically suppress noise interference. Theoretical analysis shows that the proposed method can improve the signal-to-noise ratio and improve the measurement accuracy in complex environments.