一种基于单CPU芯片的电容测量仪

Capacitance measuring meter based on one single CPU chip

研制了仅用一个单片机和二极管环形电桥测量电路构成的电容测量仪,其单片机提供了二极管环形电桥测量电路所需的激励矩形波,并完成模数转换、数据处理以及显示等功能。对于电容量为5～30 pF范围的电容进行了测量,输出电压与电容量的对应关系经回归分析,得到判定系数R2=0.989 1,R为相关系数。

A capacitance measuring meter consists of a diode-ring-bridge measuring circuit and only one CPU chip.The chip supplies the excitation square wave signal for the diode-ring-bridge circuit,accomplishes A/D conversion,data processes and display.The capacitances between 5 pF and 30 pF are measured and the relationships between capacitances and voltages are procured.By regression analysis,the determinative factor R2=0.989 1.