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本文从交流电桥的基本原理出发,导出了导线分布电容对以正弦交变电流供桥、载波放大式应变仪中测量电路影响的一般关系式,从而指明其影响的大小主要取决于仪器载频的高低和加在相邻臂上容差的大小;文中还通过对应变仪实际电路的分析,进一步阐明了导线分布电容对应变测试影响的关键,在于易导致放大器的灵敏度降低或阻塞,而造成饱和失真;并介绍了简易判定仪器灵敏是否正常的方法。
In this paper, starting from the basic principle of AC bridge, the general relationship between the distributed capacitance of the conductor and the measuring circuit in the sinusoidal alternating current supply bridge and the carrier amplification strain gauge is derived, indicating that the size of the influence mainly depends on the carrier frequency of the instrument. The height and the size of the tolerance added to the adjacent arm; the analysis of the actual circuit of the transformer is also used in this paper to further clarify the key to the influence of the distributed capacitance of the conductor, which is that the sensitivity of the amplifier is reduced or blocked, causing saturation. Distortion; and introduced a simple way to judge whether the sensitivity of the instrument is normal.