An anti-interference high-precision analog quantity sampling method and device

Abstract

The invention discloses an anti-interference high-precision analog quantity sampling method and device. The device includes an amplifier circuit, an analog / digital converter and a digital signal processing unit; the analog / digital converter is connected with a reference voltage generator; the amplifier The output end of the circuit is connected to the input end of the analog / digital converter, and the output end of the analog / digital converter is connected to the input end of the digital signal processor; the described amplifying circuit adopts a voltage follower based on an operational amplifier; the measured signal is obtained by The analog signal input terminal is input, the analog signal input terminal is connected to the same input terminal of the operational amplifier through the current limiting resistor R2, the reverse input terminal of the operational amplifier is connected to the output terminal of the operational amplifier, and the output terminal of the operational amplifier is the output terminal of the amplifying circuit . The anti-interference and high-precision analog quantity sampling method and device are easy to implement and have high sampling precision.

Description

technical field [0001] The invention relates to an anti-jamming high-precision analog quantity sampling method and device. Background technique [0002] The application site in the field of bulk material transportation often needs to collect 4-20mA analog signals provided by equipment such as ammeters, belt scales, frequency converters, and coal crusher vibration detection instruments. Some signal sampling, such as the instantaneous flow rate of belt scales, needs to reach 1‰ or higher accuracy requirements. The existing analog quantity sampling scheme applied in the field of bulk material transportation, due to the influence of device error, temperature drift and other aspects, the sampling accuracy cannot meet the requirements of use. At the same time, due to the harsh field application environment, various interference noises will be generated to affect the sampling, which may cause inaccurate sampling values ​​and cause misjudgment and misoperation, or cause circuit fai...

AI Technical Summary

Problems solved by technology

The existing analog sampling scheme applied in the field of bulk material transportation, due to the influence of device error, temperature drift and other aspects, the sampling accuracy cannot meet the requirements of use

At the same time, due to the harsh field application environment, various interference noises will be generated to affect the sampling, which may cause inaccurate sampling values ​​and cause misjudgment and misoperation, and cause circuit failure or damage in severe cases.

Images