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首先简单介绍一下质谱仪的原理质谱仪是检测物质分子（原子）质量的仪器，他能严格区分一种元素的不同同位素，能区分一个待测样品中的不同元素。

本文以PDL-250型电脑ATX开关甩源为例，介绍其工作原理和多种故障的维修思路以及维修技巧，供参考。一、原理分析1.待机电源待机电源又称辅助电源，电路见附图。

工作原理恒温控制器由热敏电阻Rt1、Rt2、NE555时基电路、温度范围调整电阻RP1、RP2及控制执行机构组成，电路如图1所示。

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