For the realization of wide range switching,high precision and low cost,a digital capacitance measurement circuit is proposed based on pulse-counting principle and automatic range switching.The circuit structure and working principle of the digital capacitance measurement circuit are studied,and capacitance time conversion circuit,automatic range switching circuit,control circuit,counting and display circuit are designed.The whole circuits are constructed and simulated by Multisim.The simulation results show that the circuits have achieved higher precision and wider measuring range,and are worthy of wide-spread application.
关键词
电容测量/数字电容表/自动量程切换/Multisim
Key words
capacitance measurement/digital capacitance meter/automatic range switching/Multisim
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