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12-Channel Electrocardiograph User Manual
Operation Preparations
The Precordial Electrodes’ Positions on Body Surface:
C1: Fourth intercostal space at the right border of the sternum
C2: Fourth intercostal space at the left border of the sternum
C3: Fifth rib between C2 and C4
C4: Fifth intercostal space on the left midclavicular line
C5: Left anterior axillary line at the horizontal level of C4
C6: Left midaxillary line at the horizontal level of C4
The Extremity Electrodes’ Positions on Body Surface:
R/L: below the right/left clavicle
N/F: below the right/left rib
The quality of ECG waveform will be affected by the contact resistance between the patient
and the electrode. In order to get a high-quality ECG, the skin-electrode resistance must be
minimized while connecting electrodes.
Electrodes Connection:
1) Align all lead wires of the patient cable to avoid twisting, and connect the disposable
electrodes to the lead wires.
2) Clean the electrode areas on the body surface with 75% alcohol.
3) Attach the disposable electrodes to the electrode sites.
Note: The quality and the placement of the electrode will directly influence the quality of
exercise ECG. The wrong placement and use of electrodes will cause incorrect
analysis results.
WARNING
1. Make sure that all electrodes are connected to the patient correctly before operation.
2. Ensure that the conductive parts of electrodes and associated connectors, including
neutral electrodes, do not come in contact with earth or any other conducting objects.
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