【摘要】 设计了一种以AT89S52单片机为核心、A/D转换芯片LTC1865为基础,结合量程自动转换电路的高精度数字电压表,可以对(0～400)V电压范围的电压进行量程自动转换的精确测量。测试结果表明,该电压表具有测量精度高、性能稳定、转换速度快及显示清晰度高等特点,有很好的实际应用价值。更多还原

【Abstract】 This paper presents the design proposal of high precision digital voltmeter,by taken single chip microcontroller AT89S52 as the core,A/D converter chip LTC1865 as the foundation,and combined with the circuit of automatic range conversion.The voltmeter can measure the voltage range from 0V to 400V precisely and automatically.The test results show that the voltmeter has the features such as:high precision of measuremont,stable performance,fast conversion and high definition of display,and has the very good practical application value.更多还原