ABSTRACT
With the development of digital electronic technology, digital logic circuit control system has gradually become the mainstream of modern detection technology. In industry , people is also taking more and more attention in digital measuring system. In the practice, we often encounter to detect two difference signals of phase. This research is important aspects in an indispensable phase frequency characteristics of network. Digital devices are with digital control phase, high precision, stable performance, easy reading and less regular debugging.
First, two input signals with same frequency were amplified, then transformed two pulse signals. AT89C51 sampled them and calculated their frequency, phase difference. The detect range were from 50Hz~2kHz in frequency and 0o ～ 360 o in phase difference.
The hardware of this topic was designed by Protel99 SE, and the hardware emulator was designed by base Keil c V3.60.When the system was debugged, it carried out all required precision.
