在对信号频率进行测量的研究过程中，设计了三个测量档位，在不同的档位的到频率的精确度也不同，并且选择不同档位，相应的小数点的位置也不同。-In the study to measure signal frequency, the design of the three measuring stalls in different stalls to the frequency accuracy are different, and the choice of different stalls, th