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目前国产或进口的心电图机型号很多,它们的主要结构和功能基本相同,而在辅助结构和功能方面则有所差异。有的心电图机(如XDH—3B型)设有“50Hz滤波开关”,当将此开关置于“滤波”位置时,即对50Hz的信号起到较强的抑制作用,使描记的心电图波形免受环境交流50Hz信号的干扰。因此它受到心电图机使用者的欢迎。我们曾到一些医院了解过,有些医卫人员将此开关一直置于“滤波”的位置上,这就很不恰当。因为,经过对心电信号进行频谱分析,我们知道它的频率范围在1—100Hz之间。因此,50Hz滤波器的使用既抑制了外界交流电等信号的干扰,同时又不可避免地抑制
At present, there are many types of electrocardiographs made in China or imported, and their main structures and functions are basically the same, while the auxiliary structures and functions are different. Some electrocardiograph (such as XDH-3B type) has a “50Hz filter switch”, when the switch is placed in the “filter” position, that is, the signal of 50Hz play a strong inhibitory effect, so that the ECG waveform tracer Interfered by environment exchange 50Hz signal. So it is welcomed by users of electrocardiographs. We have learned from some hospitals that it is not appropriate for some medical staff to keep this switch in a “filtered” position. Because, after a spectrum analysis of the ECG signal, we know that its frequency range between 1-100Hz. Therefore, the use of 50Hz filter not only suppresses the external AC signal interference, but also inevitably suppressed