一种基于STM32的便携式远程幅频特性测试仪设计

Design of a Portable Remote Amplitude Frequency Characteristic Tester Based on STM32

针对幅频特性的测量要求和方法,采用STM32F103为核心控制器,以DDS集成芯片为核心器件,并与程控放大器组合,在STM32的控制下,构成幅度可调节、频率可连续变化的信号源,以满足不同被测器件的输入要求。利用AD8361均值响应检波器获取被测器件输出端的幅度信息;采用STM32内部AD实时采集检波器输出的幅度信息;利用示波器的X-Y显示方式,搭配STM32内部自带DA输出的锯齿波,在示波器上显示幅频特性曲线。利用频分复用合并被测器件的幅度信息和频率信息,通过双绞线实现远程传输,在接收端利用滤波器分离两路信号;在接收端的液晶屏上制作了一个UI界面,在UI界面上描绘幅频特性曲线。通过采用数字化技术,充分发挥了主控制器片上资源的优势,实现了信息的远程传输。

In view of the measurement requirements and methods of amplitude frequency characteristics,STM32F103 is used as the core controller,DDS integrated chip as the core device,and combined with program-controlled amplifier.Under the control of STM32,a signal source with adjustable amplitude and continuous frequency is constructed to meet the input requirements of different devices under test.AD8361 average response detector is used to obtain the amplitude information at the output of the device under test,the amplitude information of geophone output is collected in real time using STM32 internal AD,and using the X-Y display mode of oscilloscope and the saw tooth wave of STM32 with DA output,the amplitude frequency characteristic curve is displayed on the oscilloscope.Frequency Division Frequency division multiplexing is used to combine the amplitude information and frequency information of the device under test,and the remote transmission is realized through twisted pair,a filter is used to separate the two signals at the receiving end.A UI interface is made on the liquid crystal display panel of the receiver,and the amplitude frequency characteristic curve is drawn on UI interface.By using digital technology,the advantages of onchip resources of the main controller are brought into full play,and the remote transmission of information is realized.