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1958年以来:北京地磁台一直采用马丁(Mating)磁经緯仪提供观测数据。经使用发现,马丁仪的H、Z月均值有明显的与地磁场季节变化无关的年变化,为此通过分析该观测仪与核旋仪重迭观测时期的H、Z、F月均值之差和观测温度月均值的相关关系,找出修正马丁仪观测值的经验公式。结果表明:改正后马丁仪的月均值与核旋仪月均值之差的均方差为±3~γ,改正值与标准观测仪的实际比测值相吻合。
Since 1958: Beijing Geomagnetic Observatory has been using Mating magnetic theodolite to provide observational data. The results show that the monthly mean of H and Z of Martin instrument has significant annual change unrelated to the seasonal change of geomagnetic field. Therefore, by analyzing the difference between H, Z and F monthly mean over the observation period of this observer and nuclear rotation instrument And the monthly average temperature of the correlation between the relationship to find out the modified Martin experience of empirical values. The results show that the mean square error of the difference between the monthly average of the mean value of the Martin instrument and the average monthly value of the nuclear rotation instrument is ± 3 γ, and the correction value is in good agreement with the actual measured value of the standard observer.