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Chapter 8 Troubleshooting
To record a stable and accurate ECG, when a failure occurs, please find out its cause, and
solve it with effective solutions.
ECG machine cover should be opened only by qualified service personnel.
There are no user-serviceable parts inside the ECG machine.
8.1 Interference Problem
During use, ECG machine will inevitably be disturbed by the environment, itself, human static
electricity etc. The ECG machine is desired with functions of myoelectric filter, baseline drift
filter, and frequency filter. As the filter band is limited, interference signals cannot be filtered out
completely. Therefore, please avoid the interferences caused by the environment or
non-standard operation during use.
8.1.1 AC Interference
Fig. 8.1 ECG with AC interference
1）Environment Cause:
Both ECG machine and metal bed are properly grounded.
Avoid electrical devices of large power working in the vicinity of the ECG machine,
such as X-Ray machine or ultrasound instrument etc.
2）Patient Cause:
Inform the patient of no touching the wall or metal bed edges. Don’t let other people contact
the patient.
3）Electrode Cause:
Check whether the electrodes or lead wires are connected correctly,
Electrodes and skin are well applied with conductive cream, clean the patient’s electrode
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