3-lead ECG monitoring system: article / Mohamad Nizar Azizan

Upon the rise of patients today causes the demands for medical equipment. The aim today is to develop and enhance new medical instrumentation to aid the needs of medical teams around the globe. This project concentrates on the Electrocardiogram (ECG) signals of the heart. This apparatus is a 3-lead ECG monitor which means it view electrical activity of the heart from 3 points of view. The ECG signals amplitude produced from human hearts are very small which are measured in milivolts (mV). Thus, this project uses an amplifier AD624ADZ which has a gain of 1000 to amplify the signal. The ECG signal is therefore amplified to values in Volts (V) that can then be read using an oscilloscope. In order to only allow the low frequency signals of the heart to pass, a low pass filter is implemented at the output of the amplifier before the oscilloscope. Upon completion of the design, the measured outputs are proven to be correct by analysis based on medical journals and books and the output waveform can be compared to nearly as equal as the expected output.