In order to improve the measurement lower limit and anti-interference ability of the swirlmeter, the internal voltage-variable crystal acquisition circuit of the swirlmeter is given. A detection circuit composed of three Instrumentation amplifier and a voltage-parallel negative feedback circuit is adopted here to eliminate the effect of power-frequency noise interference, the input impedance is increased and the lower limit of the range is expanded, The experimental results show that the swirlmeter designed by the improved circuit has a wide range and anti-jamming performance, the accuracy can reach 1% in the measurement range.
In order to solve the problems of inconvenient data acquisition and low reliability when data acquisition Instrument are applied in the urban area, a new design of data acquisition instrument based on 5G technology and local storage is introduced in this paper. The instrument is designed to work in two power supply mode-external and internal power supply. Working in external power supply mode, data can be transmitted and backed up in real time; Working in internal power supply mode, data is transmitted in a set time period to realize low power operation. All the data can be saved in the event of a data error or loss by extracting data held by a local storage device.
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