Two redundant position sensitive proportional counters (PSPC) operating in the energy range from 0.1 to 2.4 keV are the prime focal plane instruments on board the X-ray astronomy satellite Rosat, Rosat was launched on June 1, 1990 and has operated highly efficiently since then. The authors report on the in-orbit performance of the PSPC. Apart from its food energy and position resolution ( delta E/E=41% and 230 mu m full width at half maximum at 1 keV, respectively) the detector has a very high charged particle background rejection efficiency of 99.8%. The gas gain of the detector is very stable. Short-time variations due to thermal variations over one orbit are less than 1%. The long-term drift over one month is 0.5%.
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机译：X射线天文学卫星Rosat上的两个主要位置平面仪器是两个工作在0.1到2.4 keV能量范围内的冗余位置敏感比例计数器（PSPC），Rosat于1990年6月1日发射升空，自那时以来一直高效运行。作者报告了PSPC的在轨性能。除了其食物能量和位置分辨率（分别在1 keV时，δE / E = 41％和半峰全宽分别为230μm）外，该探测器还具有极高的带电粒子本底抑制效率，为99.8％。检测器的气体增益非常稳定。由于一个轨道上的热变化而引起的短时变化小于1％。一个月的长期漂移为0.5％。
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