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, the corresponding location of the decimal point is also different.