The sensor can convert the non-electric signal into a subsequent electric signal circuit measurement and analysis, and it is an essential component in the single chip microcomputer. The non-electric signal and the electric signal are naturally the links of mutual conversion. In MACSYM, the quality and characteristics of the sensor affect the function of the whole circuit. In the field of temperature measurement, the advantages of fast speed, wide measuring range and low price occupy a certain market share, and the negative temperature coefficient (NTC) has always been the focus of attention. However, different interchangeability hinders the numerical difference between series standards and the individual difference of the same series standards, which seriously affects the practical use.

The second paragraph is translated as follows

In this paper, a backpack temperature modulus tester is designed with AVR microcontroller as the core. The high-precision temperature sensor PT 100 is used to measure the heating environment in the tester in real time and accurately. The constant current source circuit is used as the sensor driving circuit, and the temperature data is obtained by TLC2543 high-speed sampling. At the same time, the critical impedance value is measured by constant current source bridge, and the output signal of the bridge is converted into digital signal by A/ D converter with PGA. These temperatures are used to prevent the corresponding numerical data recorder from being handed down from the single chip microcomputer through oral instructions and handed down to the PC, and this calculation method is used to measure the standard temperature characteristics.

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