What is The Principle of ECG

The electrical potential of the heart initiating from the body is taken by electrodes which purpose to change the electrical potential into electricity. Between the electrodes and the tapping selector, there is a defense circuit that helps to defend the defibrillator when using it. The lead selector is used to choose the kind of lead made by ECG Machine Manufacturers, specifically the normal 12 lead ECG. On the standardization circuit, low-amplitude biopotential signals (in mv) are augmented by a pre-amplifier circuit. The segregation circuit serves to separate noise that inhibits with the measurement as well as to separate the seepage of the mains line voltage which can imperil the patient whose heart biopotential signal is being calculated. The sieve will eradicate noise that goes along with the biopotential signal. The sieve serves to diminish unwelcome frequencies and pass the wanted frequencies, therefore Band Pass Filter is used on the ECG. Since the breadth of the biopotential signal has a voltage range from negative to positive, it is essential to shift the zero level of the signal to a constructive direction.
Thus, all augmented voltages have optimistic voltages. This change is approved out by the final amplifier circuit (main amplifier). Then the consequences of the final amplification of the biopotential signals are arrived into a chronicling circuit (recorder) and then reproduced on paper (recording paper) bought from ECG Machine Dealers.