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该智能数字万用表以双积分A/D转换器MC14433P与单片机MSP430F2274为主要控制核心器件,可实现多量程交、直流电压和电阻的智能化测量等功能.交流电压经过AD637真有效值转换为直流电压信号,电阻的测量利用Rx/Vo电路也转换为直流电压信号,电压信号经过MC14433采样、转换,得到测量值并在数码管上显示;同时单片机一方面对转换结果进行采集,在片内进行数据分析处理,在LCD上显示标称值、测量值及两者间的相对误差,以方便用户检测产品;另一方面控制继电器,实现不同量程间的智能切换.“,”The intelligent digital multimeter to double integral A / D converter MC14433P with MSP430F2274 microcontroller core as the main control device,can be multi-scale AC and DC voltage and resistance measurement functions of intelligence.After AD637 True RMS AC voltage into a DC voltage signal,resistance measurements using Rx / Vo circuit is also converted to DC voltage signal,voltage signal through the MC14433 sampling,conversion,measurement and digital display;while the microcontroller on the one hand acquisition of the conversion results in on-chip data analysis and processing in the nominal value on the LCD display,measured value and the relative error between the two,the convenience of users testing the product;On the other hand,control relays intelligent switching between different scales.