The high and low temperature box wind speed is greater than 3 m / s. The value of A in software design is taken as 0.006725. The total gas pressure P can generally be taken as standard atmospheric pressure 101.325 kPa. In the hardware design process, the influence of wind speed and atmospheric pressure on humidity is taken into account. In order to accurately measure the humidity, the calibrator has a keyboard interface, and the wind speed ν and atmospheric pressure P value in the program can be corrected through the keyboard when necessary. In addition, due to manufacturing process and other reasons, when Pt100 platinum resistance is at 0 ℃, R0 is not necessarily 100 Ω accurate, and the value of R0 can also be corrected through the keyboard.
ADuC834-based portable temperature and humidity environment test calibrator can quickly and easily measure the temperature and humidity values ​​of various points in the test box. The hardware circuit is simple, the volume is small, and it is convenient to carry. By comparing the measurement data with high-precision measuring instruments, its technical indicators fully meet the requirements of the relevant standards; using a large-screen LCD display, its display information is clean and clear. The calibrator has been used in actual work, with stable operation, convenient use, and significantly improved working efficiency.
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