本系统基于C8051F020实现等精度的频率测量，利用该单片机灵活的控制功能及速

度优势，大大提高了性能和测量精度。以往的测频都是采用高频段直接计数、低频段间接测周

的方法，其测量精度往往会随着被测频率的改变而受到影响。为了克服测频中高低频段测量精

度不等的缺陷，采用双计数器设计，实现等精度的频率测量。等精度的测量方法不但具有较高

的测量精度，而且在整个测频区域内保持恒定的测量精度。-The system is based on C8051F020 achieve equal precision frequency measurement, the use of the flexible single-chip control functions and speed advantage, greatly improving the performance and measurement accuracy. Previous measurements are made of high-frequency band direct counting method week low frequency indirect measurement, the measurement accuracy is often measured as the change in the frequency of the affected. To overcome the high and low band frequency measurement accuracy ranging from defects, dual counter design, implementation, and other precision frequency measurements. Such as the accuracy of the measurement method not only has high accuracy, and maintain a constant accuracy over the entire measuring frequency region.