210g0.1mg智能電子分析天平電路設(shè)計

1、湖南大學(xué)碩士學(xué)位論文210g/0.1mg智能電子分析天平電路設(shè)計姓名：陳良柱申請學(xué)位級別：碩士專業(yè)：儀器科學(xué)與技術(shù)指導(dǎo)教師：滕召勝2010-04-10碩士學(xué)位論文 III Abstract Electronic analytical balance is the high-accuracy instrument for mass measurement, which is widely used in national defense,

2、 scientific research, factories, and laboratory quality standards for mass measurement, with high accuracy and fast response, good stability and so on. In order to guarantee the merit mentioned above, the consideration o

3、f real-time, accuracy, stability and reliability are required and the circuit performance becomes critical to the measure performance of electronic analytical balance. In this thesis, for a type of intelligent electronic

4、 analytical balance, a cooperative project supported by Hunan University and Shanghai Precision the design of electronic analytical balance system and function are given. Secondly, a complete circuit design of electroni

5、c analytical balance is constructed. In the design of analog circuit, a photoelectric detection circuit is used to achieve the transformation from the tested samples mass to electric signal, a current signal with enough

6、drive capability through PID regulator and power circuit is outputted, which flows to the electromagnetic force balance sensor coil and high-precision, low drift sample resistors. Then the anti-aliasing low-pass filter c

7、ircuit is exploited to the extraction of useful signal and noise filtering of the voltage signal of the sample resistance. In the design of digital circuit, the voltage signal and temperature signal is detected and trans