摘要
为解决万用表无法测量Q、D等参数的问题,设计了基于AD633模拟鉴相的Q表。该测量仪采用DDS芯片AD9851产生正弦激励信号和基准信号,利用高集成度模拟乘法器AD633对信号进行模拟鉴相,并采用差分转换器AD8138对鉴相输出信号进行单端转差分变换,由C8051F060内部自带的ADC对差分信号进行模数转换和数据处理。Q表具有多量程自动切换和LCD实时显示等功能,且体积小、成本低,能满足工程、教学科研测量的需要。
In order to solve the problem that the multimeters are unable to measure the parameters of Q,D,etc.,the Q meter based on AD633 analog phase detection has been designed.In the instrument,the sine energizing signal and reference signal are generated by the DDS chip AD9851,and phase detection of the signal is implemented by using highly integrated analog multiplier AD633.The single end output signal of phase detection is then converted into differential signal by the differential converter AD8138;and the differential signal is converted into digital and processed by the self-contained ADC of C8051F060.This instrument offers the functions of automatic range changeover,LCD real-time display;and features of compact,low cost as well as meets the measurement demands in engineering projects,teaching and research areas.
出处
《自动化仪表》
CAS
北大核心
2011年第5期63-65,69,共4页
Process Automation Instrumentation
基金
国家创新方法专项基金资助项目(编号:2008IM040500)
国家自然科学基金资助项目(编号:40974065)
四川省地质灾害防治与地质环境保护国家重点实验室自主研究课题基金资助项目(编号:SKLGP2009Z007)
关键词
模拟鉴相器
Q表
乘法器
差分转换
模数转换
Analog phase detector Q meter Multiplier Differential conversion A/D conversion
