Service manual

ECG Front End
3-11
3ECG Front End
The ECG Front End provides the interface between the system and the patient. It
electrically isolates the patient to prevent excess leakage current, protects the system from
defibrillator and electrostatic discharges, and converts the analog electrical signals present
on the patient to digital samples for processing and printing.
Figure 3-4 Front End Block Diagram
Isolation Power Transformer
The Isolation Power Transformer passes power to the ECG Front End and electrically
isolates the patient-connected circuitry of the Front End from the rest of the instrument.
Front End Power Supply
The Front End Power Supply delivers separate, regulated power at 5V to the digital and
analog circuitry.