元件测量仪论文.doc

- . z 元件参数测量仪 摘 要: 本设计以单片机AT89S52为控制和数据处理核心，由正弦信号发生模块、电源模块、功率放大模块、显示模块、电阻测量模块、电容测量模块、电感测量模块、电导测量模块、电纳测量模块、导纳模测量模块、导纳角测量模块组成。采用数字控制DDS芯片AD9851产生100Hz－10KHz正弦信号，经滤波、电压放大和功率放大后驱动网络负载。从网络负载中取测量信号输入到以真有效值转换集成芯片AD637为核心的电压和电流测量电路构成的导纳模测量模块中进展负载测量。导纳角测量模块是从导纳模测量模块中取一组信号经过零比拟后使用鉴相器和计数器对信号相位差测量。把上述的测量结果经单片机处理后用数码管显示。为了提高测量精度，将各局部电路的误差合理分配，使电路到达最正确测量效果。 关键字：导纳，导纳角，DDS，AD637，网络导纳分析仪 Abstract:This simple network conductance analyzer take Ling Yang microcontroller SPCE061A as the core of the control and the data processing, which is posed of the sine signal generator module, the power enlargement module, the conductance survey module, the conductance angle survey module, the network load as well as the man-machine interface module. The 100 - 10 KHz sine signal is generated by AD9851, which drivers the network load after passing the filter, the voltage amplification and the power enlarges module. The conductance survey module is posed of voltage and current metering module, which takes AD637 as the core, which the survey signal is metered in. The conductance angle survey module takes a group of signals from the conductance survey module to the zero detecting module to survey the shift of phase of the signal. The above measurement result which is processed by the microcontroller is shown in the LCD. In order to increase the measuring accuracy, error is distributed rational to each part of electric circuits, which achieves the best survey effect of the electric circuit. Key words: conductance, conductance angle,DDS, AD637, simple network conductance analyzer1.系统方案选择与论证 1.1 设计要求 1.1.1 根本要求 电阻电容器电感器电导电纳导纳模 电阻 电容器 电感器 电导 电纳 导纳模 导纳角 测试仪 数字显示 外供±5V(500mA)电源 〔1〕测量围 A.电阻100Ω～1MΩ； B.电容100pF～10000pF； C.电感100μH～10mH。 (2) 测量精度：±5% 。〔3〕制作4位数码管显示器，显示测量数值，并用发光二极管分别指示所测元件的类型和单位。 1.1.2 发挥局部 测量电导、电纳、导纳模、导纳角 A.电导Re [Y ] 0.1 mS ~ 10mS ，分为假设干量程，测量误差的绝对值小于理论计算值的10%； B.电纳Im [Y ] 0.1 mS ~ 10mS ，分为假设干量程，测量误差的绝对值小于理论计算值的10%； C.导纳模|Y |测量误差的绝对值