The external output socket is equipped in the electrocardiograph,
through which the electrocardiograph can send rhythm lead signals to
the external equipment.
Choose from: Off, Standard or Triggered
Select Standard, the electrocardiograph sends ECG signals of rhythm
lead 1.
Select Triggered, the electrocardiograph sends pulses with the height of
5V and the width of 45ms, based on the data of rhythm lead 1.