Service manual

Performance Verification
2-14
ECG Simulation
Taking an ECG using a 12-lead ECG simulator allows you to verify areas of operation that
the extended self-test cannot check:
• integrity of the patient cable
• accuracy of the paper speed (not available on all simulators)
• accuracy of the gain settings (not available on all simulators)
The recorded ECG trace should look similar to the one shown in Figure 2-2. Trace
differences may result from differences in simulators, simulator settings, and from
differences in configuration and control settings on the cardiograph. To make a recording
similar to the one in Figure 2-2:
1. Connect the patient cable leadwires to the simulator.
2. On a PageWriter 200/200i/300pi, verify that all leadwires are connected by cycling
through each lead group and observing the display for flatline. Firmly pull each lead-
wire taut and look for excessive noise on the display.
3. Select the 12-lead Manual format on the front panel display.
If you are using a PageWriter 100, cycle through all lead group selections to verify the
performance of all leads.
4. Press twice to start the recording.
5. Print approximately 2-1/2 pages. Press .
6. Press twice to print an Auto ECG. Make sure the cardiograph advances the
paper to the top of form.
When the recording is complete:
• Verify trace activity for all 12 leads. This assures integrity of all patient electrodes and
leadwires. Noise should measure less than 1 mm, and there should be no baseline wan-
der.
• Verify no gross distortion of complexes or calibration pulses (no overshoot, etc.).
• Verify that calibration pulses are of proper duration. This assures the correct paper
speed. With the cardiograph set to record at 25 mm/sec, the calibration pulse should
measure 5 mm (calibration pulse duration is 200 ms).
• Verify that calibration pulse amplitude is correct.
An arrhythmia simulator is not an acceptable tool for verifying computerized ECG
analysis. The analysis software is biased to process human ECG data.
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