正弦波信号参数分析仪

　　为了满足低端场合的信号参数分析仪性价比高的要求，设计出低成本正弦波信号参数分析仪。系统由频率测量、幅度测量和信号发生器三大部分组成。频率测量部分由单片机89S52采用测频和测周的方法对信号进行频率测量，测量误差远优于1%。幅度测量部分采用峰值保持电路，测量误差能保证在2%左右。信号发生器采用文氏电桥实现了幅度从0～10 V连续可调、频率从66 Hz~75 kHz连续可调的正弦波。

　　Abstract:

　　In order to achieve a high capacity-price rate in low level occasions， a sine wave signal parameter analyzer with low cost is designed. It contains three components： frequency measurement、amplitude measurement and signal generator. The technology of frequency and period measurement is adopted by using the MCU 89S52， the measurement error is above 1%. The peak holding circuit is applied in amplitude measurement， which can ensure the performance of 2% error. Based on Wien-bridge circuit， a sine wave signal is generated， whose amplitude has a continuous range of 0~10V and frequency lies in the continuous range of 66Hz~75kHz.