High-precision synchronous vibration data collection card for various types of detection signals

Abstract

The invention relates to a high-precision synchronous vibration data collection card for various types of detection signals, and the data collection card comprises three IEPE interface circuits, wherein each IEPE interface circuit is connected with a constant current source circuit, and the output end of each IEPE interface circuit is sequentially in series connection with a program control amplification circuit, a filtering circuit, a single-end rotating difference circuit and an AD converter through the constant current source circuit. The output end of a 4-20mA current input interface circuit is connected with the input end of an I/V conversion circuit. The output end of the I/V conversion circuit and the output end of a millivolt-level voltage input interface circuit are respectively in series connection with the program control amplification circuits, the filtering circuits, the single-end rotating difference circuits and the AD converters. The output end of a +/-5V voltage signal input interface circuit is sequentially in series connection with the filtering circuits, the single-end rotating difference circuits and the AD converters. The AD converters in all interface circuits are cascaded, and then are connected to a single-chip microcomputer. The control input ends of the program control amplification circuits in all interface circuits are connected in parallel, and then are connected to the single-chip microcomputer. The single-chip microcomputer communicates with an upper computer through a USB port. The data collection card can achieve the high-precision synchronous collection of data.

Description

technical field [0001] The invention relates to a data acquisition card, in particular to a high-precision synchronous vibration data acquisition card used in the field of equipment state monitoring and collecting multiple types of detection signals. Background technique [0002] At present, the domestic data acquisition technology has made great progress, but the types of acquisition signals are still limited, the accuracy of data acquisition still needs to be improved, and the application occasions are limited. The research on data acquisition technology in foreign countries started earlier, and the developed data acquisition system technology is relatively mature. There are many types of signal acquisition, wide range, high precision, good reliability, and no need for peripheral adjustment circuits. However, the price is expensive, which is difficult for some small and medium-sized enterprises to accept, and the operation of the system is relatively cumbersome, which put...

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But the price is expensive, it is difficult for some small and medium-sized enterprises to accept, and the operatio

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