word 文档 可复制编辑 电容测试仪 摘 要 本系统以 51单片机为控制核心，通过 555构成的脉冲发生器，产生 150ms， 占空比约为 100%的触发脉冲作为单稳态电路的输入。根据单片机控制选择不同 量程的电容值进行切换，测量脉冲宽度，从而求出 1000PF—1UF电容。 Abstract The single-chip microcomputer system for the control of the core 51 through 555 constitute the pulse generator, resulting in 150ms, duty cycle of approximately 100% of the trigger pulse monostable circuit as input. Single-chip control in accordan