General vibration signal measuring system of fan

The invention discloses a general vibration signal measuring system of a fan, wherein the system realizes the variable frequency multi-channel synchronous sampling function for automatically tracking revolving speed based on phase signals. Site phase signals can be effectively identified and regulated by adopting two-way peak detection superimposing technique for phase signals, thereby improving the adaptability of field application of products. A general signal access circuit is designed to be a compatible circuit which is capable of enabling a plurality of vibration sensor signals of circuits to be compatible, realizing the synchronous, fast and high-precise sampling of signals, and being suitable for the state monitoring system design of large rotation machineries in various industrialsites. The A/D (analogue/digital) sampling frequency can be adjusted automatically according to the revolving speed by a CPLD (complex programmable logic device) logic control circuit; the single-board multi-channel synchronous sampling is realized, and multi-board card multi-channel synchronous sampling is also realized. The measuring system has the characteristics of strong generality, reliableperformance, high precision, simple configuration and the like.