50
7.3 Buttons on the control panel not working
Possible reason: The control panel and circuit board are not well connected due to the vibration in
transportation. Solution: Open the instrument cover and connect them again, if the problem still
exists, contact with our after sale service department or appointed maintenance center.
7.4 AC interference
AC interference is interference which arises from super positioning of ECG wanted signal with sinusoidal
voltages with the mains frequency. Phenomenon shown as below:
Solutions:
z Make sure the instrument is properly grounded
z Electrode or patient cable is correctly connected
z Applied electrode gel is enough
z The metal bed is properly grounded
z Keep the patient from physical contact with the surroundings.
z There is no powerful equipment operating nearby, such as X ray or ultrasonic machine
z The patient don’t wears jewelry such as glass or gem
z If interference still exists, please reset AC filter according to local AC frequency
7.5 EMG interference
Phenomenon: Recorded ECG base line has irregular vibration, as shown in the following ECG
waveforms.
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