為了滿足低端場合的信號參數分析儀性價比高的要求，設計出低成本正弦波信號參數分析儀。系統由頻率測量、幅度測量和信號發生器三大部分組成。頻率測量部分由單片機89S52采用測頻和測周的方法對信號進行頻率測量，測量誤差遠優于1%。幅度測量部分采用峰值保持電路，測量誤差能保證在2%左右。信號發生器采用文氏電橋實現了幅度從0～10 V連續可調、頻率從66 Hz~75 kHz連續可調的正弦波。

　　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.