简易幅频特性测试仪摘要根据题目要求，设计了一种幅频特性测试仪。采用精度为8位的DAC芯片DA0832，产生有效值为1V的正弦波。采用具有10位ADC功能的单片机STC12C5A60S2，实现被测信号的检测。采用运算放大电路，实现提高输入阻抗和降低输出阻抗的目的。采用按键功能，可设定输出正弦波的频率。经测试，该幅频测试仪能够输出有效值为1V的正弦波、无明显失真、全频段幅度误差在%，输出正弦波的频率范围为100-10kHZ、误差为%，交流信号的测量精度为%、分辨率为0.01V，输出阻抗小于10Ω，输入阻抗大于100k。关键词：DAC083210位ADC频率可调正弦波目录1方案论证与比较...................................................................................................................................................11.1总体思路.......................................................................................................................................................11.2各模块方案的选择与论证...........................................................................................................................22系统设计..............................................................................................................................................................52.1总体设计...................................................................................................................................................52.2硬件电路设计...........................................................................................................................................52.2.1拉力值测量模块...................................................................................................................................52.2.2电机驱动模块.......................................................................................................................................82.2.3透明胶被拉动距离测量模块.............................................................................................................83软件设计...........................................................................................................................................................103.1算法的标定实验.......................................................................................................................................103.2软件流程...................................................................................................................................................144系统测试.............................................................................................................................................................164.1测试仪器、设备.....................................................................................................................................164.2测试方法步骤与结果分析.....................................................................................................................174.2.1拉力值的测试.....................................................................................................................................174.2.1拉伸距离的测试.................................................................................................................................175结论....................................................................................................................................................................18参考文...
