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PC－604是近年国内使用较多且性能也较稳定的一种血细胞计数仪，我们在临床使用过程中发现信号电压至关重要，它不仅是HGB计数的重要指标，对HCT的计数也有着一定的指导作用，并且是整个仪器使用保养中最有学问，也是最易出现故四的地方．1仪器稳定前先开打印机，五八日期后，
PC-604 is a blood cell counter that has been widely used in China and has relatively stable performance in recent years. We found that the signal voltage is critical during clinical use. It is not only an important indicator of HGB count, but also has a certain amount of HCT counts. The guiding role is the most learned and the most easiest place for the whole instrument. 1 The printer is turned on before the instrument is stable, after the date of 5 August,