Anti-interference high-precision analog quantity sampling method and apparatus

Abstract

The invention discloses an anti-interference high-precision analog quantity sampling method and apparatus. The apparatus includes an amplification circuit, an analog / digital converter and a digital signal processing unit, wherein the analog / digital converter is connected with a pedestal generator; an output end of the amplification circuit is connected with an input end of the analog / digital converter; an output end of the analog / digital converter is connected with an input end of a digital signal processor; the amplification circuit utilizes a voltage follower based on an operational amplifier; the tested signal is input by an analog signal input end; the analog signal input end is connected with a noninverting input end of the operational amplifier through a current-limiting resistance R2; and an inverting input end of the operational amplifier is connected with an output end of the operational amplifier; and the output end of the operational amplifier is the output end of the amplification circuit. The anti-interference high-precision analog quantity sampling method and apparatus are easy to carry out, and are high in 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.

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