Checking the ECG leads

Prerequisites


Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	-	5 minutes	-


Tools and Test Equipment
Description	Quantity	Part Number	Manufacture
Ohmmeter	1	-	-

If not already done, disconnect the ECG cables from the PAC and from each other.

Figure 1. PIN Diagram of ECG Lead
Check the impedance of the ECG cables from each of the leads at point A to the other end of that lead at point B. The impedance should be 55k ohms to 63k ohms tolerance.
Check the impedance of the ECG cables from each lead at point to its respective connection at point C. The impedance should be 0 ohms.

Figure 2. Connections A and B on ECG Cables
Connect the white high impedance MRI ECG lead wires to the grey ECG patient cable by matching the colors on the white cable to the colored dots on the grey cable.
Figure 3. PIN diagram of ECG lead

Table 1. PIN diagram of ECG lead
Callout Color
1 Blank
2 Brown
3 Green
4 Black
5 White
6 Red

Differential pair combinations are
- Red (left leg) - White (right arm)
- Black (left arm) - Green (right leg)
Plug the open end of the grey ECG patient cable into the ECG port.