【摘要】 介绍了用以替代ＣＢ－３型磁变仪配电盘的三分量地磁仪自动标定器的研制原则，技术特性及两年来的使用情况，简要介绍了该仪器的电路原理，电路设计的要点，可供台站维修参考．更多还原

【Abstract】 In this paper, the manufactursing method, technological features and the using states ins 2 years of the 3-component geomagnetic equipment auto-demarcater substitute for the CB-3 magnetic variometer switchboard are introduced. The circuit principle and its designing point is simply explained. It can be referred to other seismic stations.更多还原