The design of simple Frequency Measurement
ABSTRACT
Frequency measurement is the most basic measurement in Electronic field. A simple frequency
meter mainly by the signal input and amplifying circuit， microcontroller module， sub-frequency
circuit module and display module. AT89S52 MCU is the control core frequency of dollars to
complete its count of the signal under test, decoding, display and control of the frequency division
ratio. Using its internal timer or counter to complete the signal of the under test cycle / frequency of
measurement.
Throughout the design process， periodic measurement of the frequency meter application and
the corresponding mathematical treatment to achieve 10Hz ～ 2MHz frequency measurements, and
can automatically switch the flow to achieve scale. To the core of AT89S52 microcontroller, with
the MCU internal timer / counter gate time, it can be easier for frequency measurement。The use of
microcomputer technology to design a digital display of frequency meter， have a measurement of
high accuracy, fast response, small size and so on。
KEY WORD： Frequency meter; single chip; counter； range automatically switch
