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本文介绍了 MTS 公司在疲劳试验中的载荷测量和控制。其不是采用传统的应变仪式测量方法,而是以高精度低漂移运算放大器为基本元件,并采用了共模抑制比高、温漂小、抗干扰能力强的仪用放大器电路,从而获得了很大的增益(500～5000)和很小的温度漂移(最大为0.01%/℃)。本文详细叙述了各部分电路的作用和原理,给出了详细的电路图和电路元件参数。最后将美国高精度低漂移运算放大器和国内的类似产品作了对比,说明我国目前亦具备了采用该种控制测量的可能性。
This article describes MTS’s load measurement and control in fatigue tests. Instead of using the conventional strain gauge measurement method, the high-precision low-drift operational amplifier is used as a basic component, and an amplifier circuit with high common-mode rejection ratio, small temperature drift and high anti-interference capability is used, Large gain (500 ~ 5000) and small temperature drift (up to 0.01% / ℃). This paper describes in detail the role of each part of the circuit and the principle of giving a detailed circuit diagram and circuit components parameters. Finally, the comparison between the high precision and low drift operational amplifier in the United States and similar domestic products shows that our country now possesses the possibility of adopting such kind of control measurement.