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Abstract
This paper studies and designs a high-precision resistance inductance and capacitance measuring instrument based on single-chip microcomputer. It uses MAX038 monolithic voltage control function generator to generate high-precision sine wave signal flow, through the capacitor or inductor and the standard resistance string to be tested. Connect the circuit, use the voltage ratio calculation method to calculate the capacitance value or the inductance value, use the 51 single-chip microcomputer to control the measurement and calculation results, use the 1602 liquid crystal module to display the value in real time, and the sinusoidal signal generator can realize the amplitude and frequency. In order to improve the accuracy, the measured AC voltage is first passed through the ICL7650 to eliminate the error caused by the lower input resistance of the AD637.The experimental test results show that the measuring instrument has stable performance and high measurement accuracy.
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Details
1 College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu, 210023, China
2 College of Communication Engineering, Chengdu University of Information Technology, Chengdu, Sichuan, 610225, China
3 School of Economics & Management, Tongji University, Shanghai, 201800, China