Abstract: A method, concerning screw mechanism, electronic scale and the way to obtain the fitted curve, to detect the hysteresis of cylindrical helical spring with micro-capacitance measuring technology and to compensate the hysteresis with micro-controller technology is introduced. This experiment can help students to understand that hysteresis really appears, to some extent, on actual materials, it can also help them to grasp the concept of distance between electrodes changeable capacitance transducer, and improve the ability to apply knowledge comprehensively and the ability to design and practice.

Key words: distance between electrodes changeable capacitance transducer, cylindrical helical spring, hysteresis