This experiment utilizes a phenolic resistance strain gauge with a nominal resistance of R=1208 ohms, a gauge factor of K=2.2, and a sensitive area of 2x4 mm². The measuring instrument used is the YJR-5A digital strain gauge, which provides accurate readings for strain measurements. For pressure measurement, a pressure gauge with an accuracy class of 2.5 and a range up to 250 MPa was employed. The test was conducted at room temperature (20°C), where both a working gage and a temperature compensation gage were used to minimize thermal effects. The expansion and contraction of the tube wall were found to vary linearly with internal pressure, showing good repeatability. However, due to limitations in the testing conditions, high-precision pressure gauges could not be fully utilized, and the size of the strain gauge's sensitive grid affected the overall measurement accuracy. In the software implementation, the DSP must be programmed periodically to generate a start pulse for the MAX153 ADC. The pulse frequency should exceed twice the input signal frequency to ensure accurate sampling and conversion. After the conversion completes, the INT pin (pin 9) of the MAX153 goes low, triggering the 74LS245 gate, allowing the DSP to read the data through an interrupt routine. When the input voltage is 0V, the 16-bit output is 0000001000000000; at 5V, it becomes 1111110011111111; and at 3V, the output is 1001100110011000, with an error of less than 1.2%. For other input voltages, the error remains within this range, which meets the requirements of most communication systems. The MAX153 offers low power consumption and high-speed performance, making it a popular choice in various analog-to-digital conversion applications. Its efficiency and reliability have made it widely adopted in modern measurement systems.
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