国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

Aiming at the requirements of high-precision and high-stability temperature testing of multi-channel thermocouple sensors in complex equipment testing, this paper designs a thermocouple acquisition system based on LXI bus. And the single device has 48 measurement channels. Synchronous measurement between multiple devices can be realized through the LXI bus, which greatly improves the measurement efficiency and measurement accuracy. The system adopts high-precision 24-bit analog-to-digital signal acquisition and conditioning technology, so that the voltage acquisition resolution can reach 0.032uV, and the temperature acquisition resolution can reach 0.04°C, and the voltage measurement accuracy can reach 0.05%. A high-precision fast cold junction temperature compensation module is designed, which can effectively compensate for the measurement error caused by ambient temperature changes, and the temperature measurement accuracy of T-type thermocouple reaches 0.25°C. The voltage-temperature signal conversion and compensation algorithms of various thermocouple sensors are integrated into the system, which can support temperature measurement of eight thermocouple types of J, K, T, E, S, R, B, and N. In order to effectively solve the synchronous acquisition problem between multiple devices faced by hundreds of channels of temperature acquisition, the system adopts the LXI bus architecture, and the data communication between multiple devices is carried out through LAN. In order to further verify the performance of the designed system, a temperature accuracy and voltage accuracy test was carried out by a metrology laboratory, and the results showed that the temperature measurement error of R-type thermocouple was 0.45°C and that of S-type thermocouple was 0.6°C. Finally, the K-type thermocouple was verified on a comprehensive engine test bench, and the comparison test with NI"s PXIe-4353 module was passed. It is verified that the designed thermocouple acquisition system has high measurement accuracy, and the measurement accuracy of K-type thermocouple reaches 0.5°C.