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在许多场合中需要测量磁偏角，但磁针用的时间长了，磁性就会逐渐减弱，使其灵敏度降低。在我们地质测量部门，磁针是较多的，过去为了恢复磁针的磁性，要送到工厂加工，不仅每支要花2～3元钱，而且至少要半个月以上才能交货，这就给生产上造成了一定的困难。我队为解决测量仪器修理中存在的问题，曾派人到北京科学仪器厂学习，见到该厂借用外单位的磁针充磁器使用简便，效果良好，经同意后我们把充磁器卸开，并将其线路画下，但因使用日久，多数元件的参数已无法辨认，因此只好以此为基础，重新考虑，现将我们试制的情况介绍如下：
In many cases, the declination of the magnetic flux is required, but the time required for the magnetic pin is long, and the magnetism will be weakened gradually to decrease its sensitivity. In our geological survey department, the magnetic needle is more, in the past in order to restore the magnetic needle, to be sent to the factory processing, not only spend 2 to 3 dollars each, and at least two weeks to deliver, which gives Production has caused some difficulties. My team to solve the problem of measuring instrument repair, had sent to Beijing Science Instrument Factory to learn to see the factory to borrow magnetic units outside the magnetic needle magnetron easy to use, the effect is good, we agreed to uninstall the magnetizer and Draw the line, but because of the long time, the parameters of most of the components have been illegible, so had to based on this, reconsidered, now we try to introduce the situation as follows: