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Chapter 8 Troubleshooting
8.1 Auto shutdown
The battery is almost running out, which causes overdischarge protection circuit action.
The voltage of AC power supply is too high, which causes overvoltage protection circuit
action.
8.2 AC interference
Whether the device is grounded reliably?
Whether the electrode or lead cable is connected correctly?
Whether the electrodes and skin are daubed with enough conductive paste?.
Whether the metal bed is grounded reliably?
Whether the patient is touching the wall or metal parts of the bed?
Whether the patient touches other people?
Whether there is high power electric equipment working nearby? Such as X-ray machine
or ultrasonic device, etc.
Note: If the interference can not be removed after taking above measures, please use a
AC filter.
8.3 EMG interference
Whether the room is comfortable?
Whether the patient is nervous?
Whether the bed space is narrow?
Whether patient speaks during recording?
Whether the limb electrode is too tight?
Note: If the interference can not be removed after taking above measures, please use a
EMG filter. The ECG waveform recorded at this time will be slightly attenuated.
