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目前,广泛应用以电阻应变传感器为基础的应变转换为电量的变换器,这种线路的操作、调整和准备简单,使得可以在大规模工业实验中使用它。基本上采用两种线路:放大的半桥电路和无放大的桥路。当变换的比应力不大(σ≤15公斤力/毫米~2)时,第一种电路具有优越性。半桥电路的主要缺点是采用放大器,对接线电缆的电容和电感变化灵敏,另外零点的温度漂移大。无放大桥路没有上述的缺点,为了有效地使用这种电路,必须设置机械变换器——测力计或应变计。为了同时测量和显示大量的应变测量参数(主要是轧延力),在工厂内装设通道式平衡部件。
At present, a strain-transducer-based strain converter to power converter is widely used. The operation, adjustment and preparation of such a circuit is simple and allows it to be used in large-scale industrial experiments. Basically, two types of circuits are used: an enlarged half-bridge circuit and an enlarged bridge. The first kind of circuit is superior when the specific stress of transformation is not large (σ ≤ 15 kgf / mm 2). The main drawback of the half-bridge circuit is the use of amplifiers, sensitive to changes in the capacitance and inductance of the wiring cable, the other zero temperature drift. There is no above-mentioned shortcomings of the bridge without amplification, in order to effectively use this circuit, you must set the mechanical converter - dynamometer or strain gauge. In order to measure and display a large number of strain measurement parameters (mainly rolling force) at the same time, channel balance components are installed in the factory.