The high resolution energy achromatic system consists of an electrostatic analyzer and a magneticanalyzer, which mass resolution can reach 600 and transmission is better than 80%.
静电分析器和磁分析器构成能量消色散系统，质量分辨率可达600以上，传输效率好于80%。
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By testing, homogeneity of magnetic field, magnet stability in temperature, integral stability is good. Magnet can create a proper a uniformity region for NMR core analyzer.
In this article, the principle of DDS is reviewed at first, then its new application in low field nuclear magnetic resonance core analyzer is discussed in detail.