When users use gas alarms, especially toxic/combustible gas alarms, measurement accuracy is a very important standard and factor. In addition to the accuracy of the gas alarm itself, the factors affecting the measurement accuracy should also master some commonly used measures to improve the measurement accuracy of the gas alarm. The amplifier and ADC in the sensor can complete the above amplification and conversion tasks, but in the process of amplification and conversion, due to the improper design of some parameters of the amplifier and ADC, the accuracy of the measuring instrument will decrease, so the parameters of these circuits must be calculated and analyzed to find the best value.

Because the input signal of the sensor is small and involves various dimensions (such as speed, angle, displacement, voltage, current, resistance, frequency, etc.), before entering the computer and terminal display, processing such as amplification, conversion, calibration and compensation must be performed to meet the requirements of the subsequent circuit. The development of miniaturization of alarm sensors has produced many new problems, the most important of which is the improvement and calculation of the degree of miniaturization, that is, the calculation of the allowable limit of miniaturization of electromechanical sensors and converters, while also protecting the required accuracy and predetermined measurement dynamic range. When the number of dimensions of the sensor is reduced too much, the influence of thermal noise on the mechanical components will increase. Therefore, the measurement accuracy is significantly deteriorated.

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