—电感电容测量仪器的设计论文—终极版.doc

本科毕业论文（设计） (2014届) 电感电容测量仪器的设计 院 系 电子信息工程学院 专 业 电子信息工程 姓 名 韩永奇 指导教师 陆俊峰 陈兵兵 高 工 助 教 2014年4月摘 要 近年来，电子行业的飞速发展，用户大多数使用万用表来测量一些元件参数或者电路中的电压电流。但是万用表却有一定的局限性，它只能测量有限种类的元器件的参数，却不能测量电感电容这部分元器件。所以制作一种简便的电容电感测量仪显得尤为重要，方便用户测量电路中需要用到的电容及电感的具体值。 在测量电感电容值时, 传统的测量大都采用交流电桥法和谐振法，然后通过磁性指针刻度读数，然而这些方法读数不够直观准确。通过改进，结合LRC 振荡电路原理, 结合以STC89C52单片机为控制核心，搭配必要的外围电路对电阻、电容和电感参数进行测量。基本原理是将电阻阻值、电容容值、电感感值的变化均转换成方波脉冲频率的变化，通过单片机做运算，计算出待测元件的各个参数并通过1602液晶屏显示出来。通过按键选择被测元件类型，测量时，只需将待测元件引脚放在测试仪的输入端即可。实验结果表明，该系统性能稳定，精度高。 关键词：STC89C52单片机；电阻测量；电容测量；电感测量Abstract In recent years, the rapid development of the electronics industry, most users use a multimeter to measure the parameters of some components or the circuit voltage and current. However, there are some limitations multimeter, it can only measure the parameters of limited types of components, but not in this part of the inductance and capacitance measurement components. So making a simple capacitance and inductance measuring instrument is particularly important, user-specific value measurement circuits need to use capacitors and inductors. When measuring the inductance and capacitance values,mostly using traditional measurement method and AC bridge resonant method. However, these methods usually scale reading, reading is not intuitive. By improving, based on the principle of LC oscillator circuit, combined with STC89C52 microcontroller core, with the necessary peripheral circuit resistance, capacitance and inductance parameters were measured. The basic principle is that the resistor, capacitor capacitance changes the inductance values are converted to a square wave pulse frequency changes by the microcontroller to do arithmetic to calculate the various parameters of the DUT and through 1602 LCD screen display. By button to select the type of test elements, measurement, simply put the DUT pin to the input of the tester. Experimental results show that the system performance, stability, high accuracy.