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国产XX-2心电向量图机的X通道输入保护电路元件在开机、关机或输入端开路又不封闭时很容易烧坏。笔者曾与上海医电厂技术部门协商进行了改进,使稳定性有所提高。下面是简单的原理分析与改进方法。图1为X通道的有关输入电路图,其中2BG6～9为限位保护管,主要用来保护输入级两个场效应管,防止来自输入端的强信号(导联线开路或意外干扰)和开、关机时浪涌
Domestic XX-2 ECG vector diagram of the X-channel input protection circuit components in the boot, shutdown or input open and not closed when it is easy to burn out. The author has made improvements in consultation with the Shanghai Medical Power Plant technical department, so that stability has improved. The following is a simple principle analysis and improvement methods. Figure 1 for the X channel input circuit, 2BG6 ~ 9 for the limit protection tube, mainly used to protect the input stage of the two FET to prevent strong signals from the input (open lead or unintentional interference) and open, Surge at shutdown