The ECG machine can automatically record the bioelectric signals (ECG signals) generated by the excitation of the heart muscle during heart activity, and is a medical electronic instrument commonly used for clinical diagnosis and scientific research. Before the heart beats, myocardial excitation occurs first, and in the process of excitation, a weak electric current is generated, which is conducted to all parts of the body through the body's tissues. Due to the different tissues of each part of the body, the distance between each part and the heart is different, so in the various parts of the human body surface, showing different potential changes, this kind of electrical activity within the human heart produced by the surface potential versus time is called the electrocardiogram. The electrocardiograph is an instrument that records these physiological electrical signals.1 The number of synchronized output channels in accordance with the recorder is generally divided into: single-channel, three-channel, six-channel and twelve-channel electrocardiographs, etc.
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