Abstract
On the basis of equal-accuracy frequency measurement principle, this paper takes AT89S52 microcontroller as core and designs a high-accuracy multi-function dual-path frequency meter which can measure the frequency of two circuits of signal with a range of frequency of 1Hz-10MHz at the same time, and be equipped with storage and query function as well provide two circuits (1K and 1M) of square wave signal source. This paper adopts modular design: the hardware module consists of control module, amplification and shaping module, display module, storage module, and standard square wave signal source module, etc., while the software module consists of frequency range judgment, frequency measurement, and display of frequency value. The experiment shows that this instrument has low cost, high accuracy, and strong function, with good application prospect.
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