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前言在三分量地磁的记录中,标度值的测定一般是采取给标定线圈通额定电流的方法。由于目前使用的测定标度值仪加给标定线圈的电流相当于周期较长的矩形脉冲,磁系在线圈电流通断瞬间产生的突变磁场作用下,如磁系阻尼不足,将发生扭角较大和时间较长的阻尼扭摆。对水平分量而言,有的磁系要经过近两分钟时间才能稳定下来。这不但给观测带来困难,也给仪器的性能带来不良影响。本文所介绍的电流变换电路能产生一种线性变化的电流作为标度值电流源,从而有效地解决了上述问题。
Foreword In the three-component geomagnetic recording, the determination of scale values is generally taken to calibrate the coil through-current method. Since the currently used measuring scale value added to the calibration coil current is equivalent to a longer rectangular pulse, the magnetic system in the coil current on and off instantaneous magnetic field generated by the sudden change, such as magnetic system damping less than the torsion angle will occur Bigger and longer damping damping. For the horizontal component, some magnetic systems take nearly two minutes to stabilize. This not only brings difficulties to the observation but also adversely affects the performance of the instrument. The current conversion circuit introduced in this paper can produce a linearly varying current as a scale current source, thus effectively solving the above problems.