按键脉冲是通过在一条线上按键而不是旋转脉冲拨号的信令方法。
Key Pulsing is a method of signaling by depressing keys on a line otherwise arranged for rotary pulse dialing.
控制仪通电后数码管显示和按键输入正常： （1）输出LED指示灯没有亮，电磁脉冲阀也不动作， 则有可能SD-M-3002电路损坏。
After the control device is powered on, nixie light display and key input is normal: (1)Output LED indicator is not lit and electromagnetic pulse valve does not work.
控制仪通电后数码管显示和按键输入正常： （1）输出LED指示灯没有亮，电磁脉冲阀也不动作， 则有可能SD-M-3002电路损坏。
After the control device is powered on, nixie light display and key input is normal: (1)Output LED indicator is not lit and electromagnetic pulse valve does not work.
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