范文编号:JD867 附开题报告,任务书,外文翻译,范文字数:11298,页数:34 摘要:目前的电感电容轻便仪器设计中存在精度不够高、智能化程度不足的问题。鉴于这样的原因,本文介绍了一种基于单片机的高精度电感和电容测量仪器的设计。由于电容和电感属于电抗元件,因此不能采用直流来产生测量信号,而只能采用交流信号。本设计采用DDS芯片AD9850产生高精度正弦波信号流经待测的电容或者电感和标准电阻的串连电路,通过测量相关量,利用“相位+有效值”的方法推算出电容或电感值。本设计充分利用单片机的运算和控制功能,方便地实现测量,使测量精度得到了提高。同时用软件程序代替一些硬件测量电路,可在硬件结构不变的情况下,修改软件以增加新的功能。能够很好的完成对各参数的测量,以满足现代测控系统的需要。 关键词:电容测量; 电感测量; DDS; 单片机 The design of a high-precision instrument for inductance and capacitor measurement Abstract: At present, the problem of the light equipment for inductance and capacitor measurement is low accuracy and lacking of intelligence. In view of this reason, the paper introduced a high-precision instrument for inductance and capacitor measurement based on single-chip. As a result of inductance and capacitor are reactors components, DC can not be used to generate measurement signals, but only AC signals. The design adopted AD9850 to produce a high accuracy sine wave signal, which is implemented through the series circuit of the capacity or the inductance and the standard resistance. By measuring the relevant quantity, the “phase+RMS” approach is used to estimate the value of capacitance or inductance. By taking full advantaged of the single-chip computing and control functions to facilitate the realization of measurement, the measurement accuracy has been enhanced. At the same time, a number of software programs instead of hardware measurement circuit under the hardware architecture invariable situation are applied to modify the software to add new functions, which may complete a very good measurement of various parameters in order to meet the needs of modern measurement and control system. Keywords: Capacitance measurement; Inductance measurement ; DDS; Single-chip
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