Directions for Use Chapter 7 Maintaining the Electrocardiograph 81
Testing the Equipment
Whenever the electrocardiograph is serviced or problems are suspected, Welch Allyn
recommends the following test procedures:
1. Verify continued electrical safety of the device, using IEC 60601-1 or ANSI/AAMI ES1
methods and limits. Test for the following:
• Patient leakage current
• Chassis leakage current
• Earth leakage current
• Dielectric strength (AC and patient circuits)
2. Verify that the electrocardiograph is working properly, using an ECG simulator to
acquire and print a standard 12-lead ECG of known amplitude.
• Printing should be dark and even across the page.
• There should be no evidence of print-head dot failure (no printing breaks forming
horizontal streaks).
• Paper should move smoothly and consistently during printing.
• Waveforms should appear normal, with proper amplitude, and without distortion
or excessive noise.
• Paper should stop with perforations near the tear bar, indicating proper cue-
sensor operation. For tear-bar location, see Figure 17 on page 23.
WARNING Only qualified service personnel should perform leakage current
tests.
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