ECG Leads Installation and Functional Checks

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	5 minutes	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Ohmmeter	1	-	-	-
Cardiac Signal Waveform Simulator (if available)	1	-	-	-

If not already done, disconnect the ECG cables from the PAC I/O Plate.
Check the impedance of the ECG Cables. See Figure 2. From each of the leads at point “a” to the other end of that lead at point “b” the impedance should be 0 Ohms. From each lead at point “b” to its respective connection at point “c”, the impedance should be 60k Ohms ±5% tolerance. Figure 1 shows a pin-diagram of the connection at point “c”

Figure 1. Pin Diagram Of ECG Lead

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 of the grey cable.
Plug the open end of the grey ECG Patient cable in to the ECG port of the PAC.

Figure 2. PAC Assembly With ECG Leads Connected
As an additional functional test of the ECG leads, if there is a cardiac waveform simulator available at the site, connect the leads to the simulator. Open the “Gating Control Screen” from the Scan Desktop. Select “Standard Gating” and cycle through the three different trigger leads, ECG1, ECG2, and ECG3. There should be a cardiac waveform displayed for each of the three trigger lead selections.