1、 I 基于单片机控制的便携式电容测试仪设计 摘要：元件容抗的测量在电子工程中非常的重要,无论是在实验过程还是实际应 用中都要尽力做到对于电容测量的精确。在保证量程和测量精度的基础上，利用单片机 模块将测试仪器尽可能简便化就能够大大的提高元件测量的效率。 本系统由 555 多谐振 荡器、单片机控制模块、继电器控制模块以及液晶显示模块构成。STC89C52 单片机取得 振荡器产生的信号频率，然后根据采样频率值判断是否转换量程，将数据进行处理后， 送液晶模块显示相应的被测电容参数值以及参数单位。在合适的频率范围内可测得 100PF10000PF 的电容，并且可以控制测量精度在5%范围内。 关键词：单
2、片机；电容测试；555 多谐振荡器；RC 振荡；液晶显示 The Design of Capacitance Tester Based on SCM Abstract: The measurement of capacitance is extreme significant in the electronic engineering.Not only in the experimentation but in the practical application as well, we must try our best to make sure the measurement of capa
3、citance accurate. On the promise of accurate measurement ,the capacitance tester which based on single-chip control will increase the efficiency of capacitance measurement. The system consists of 555 multivibrator, single-chip control-module, relay control module and liquid crystal display module.Th
4、e STC89C52 singlechip receive the signal frequency produced by oscillator,decide whether to change the measuring range or not according to the frequency of sampling.The single-chip will process the data and send it to the liquid crystal display module which will show the numerical value and unit of the capacitance .In the appropriate frequency coverage, the capacitance in the range of 100PF10000PF will be measured accurately within the precision in 5%. Keywords: ST
