The input protection circuit is mainly to prevent the ECG lead input high voltage from damaging the machine. The maximum and minimum of the output terminal will not exceed ± 9V, and the protection voltage is ± 9.7V after connecting the diode, which plays the role of low voltage protection. This two-pole protection ensures that no excessive voltage is introduced into the circuit, and the electrocardiograph is not damaged due to the excessive voltage.
Figure ECG machine input protection circuit
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