The high and low temperature test chamber will inevitably cause the calibrator to be large, and the power consumption is difficult to control, and it is not easy to achieve miniaturization. In order to achieve the miniaturization of the instrument, ADuC834 is selected as the central processor, CD4097 and CD4067 are used to design the multi-select circuit, A-level Pt100 platinum resistance is used as the temperature sensor, and the graphic dot-matrix liquid crystal CAG320240E is used as the display module. The multimeter is quite.
ADuC834 belongs to ADI's MicroConverter (precision analog controller) series products, which integrates a variety of precision analog functions [2], based on the 8052 core, single instruction cycle operation, built-in 62 KB on-chip FLASH and 4 KB on-chip data memory; It integrates two 200μA constant current sources and one 24-bit Σ- △ ADC. The ADC is connected to a programmable amplifier and filter inside the chip. The high and low temperature test chamber can be directly measured without an external filter and amplifier. ± 20 mV ～ ± 2.56 V signal; equipped with watchdog timer and power monitor, which can effectively ensure reliable operation of the inspection instrument. In view of the rich integrated resources inside ADuC834, the hardware circuit of the final calibrator is greatly simplified, the volume is small, it is easy to carry, and the power consumption can be effectively controlled.
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