Abstract:

This article presents a frequency meter based on 51 single chip microcomputer with a test range between 1Hz and 10 Hz.It converts sine waves,square waves and triangular waves through the peak detection circuit and the effective value detection circuit to direct current signals and sends them into the single chip microcomputer.By writing corresponding program we can make the system calculate the radio of the effective value and peak to realize the purpose of automatic test.Finally,it shows the measured results through the display circuit.The circuit of this system is concise,software writing is simple,and the debugging is easy.

Key words: high frequency;51single chip microcomputer;frequency meter