為了滿足低端場(chǎng)合的信號(hào)參數(shù)分析儀性價(jià)比高的要求，設(shè)計(jì)出低成本正弦波信號(hào)參數(shù)分析儀。系統(tǒng)由頻率測(cè)量、幅度測(cè)量和信號(hào)發(fā)生器三大部分組成。頻率測(cè)量部分由單片機(jī)89S52采用測(cè)頻和測(cè)周的方法對(duì)信號(hào)進(jìn)行頻率測(cè)量，測(cè)量誤差遠(yuǎn)優(yōu)于1%。幅度測(cè)量部分采用峰值保持電路，測(cè)量誤差能保證在2%左右。信號(hào)發(fā)生器采用文氏電橋?qū)崿F(xiàn)了幅度從0～10 V連續(xù)可調(diào)、頻率從66 Hz~75 kHz連續(xù)可調(diào)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.