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Chapter 8: Troubleshooting and Error messages
High frequencies and muscle
artifacts make ECG signal
noisy.
(This may occur concurrently
with AC noises)
Noisy ECG signal due to AC
power interferences
● Patient has stress or placed
in an uncomfortable condition.
● Patient feels cold and starts
shaking.
● Patient's limbs are not
placed properly.
● Bed dimensions are not
suitable for comfortable
placement of patient hands and
feet.
● Limb electrodes are attached
tightly.
● Electrodes are placed on
bony site of the patient body.
● Unclean or sulfated
electrodes.
● Insufficient gel is applied.
● Contact with metal parts of
bed, trolley, etc.
● Lead wires, patient cable or
power cable fails to make
connection.
● There are other electronic
devices in the vicinity of the
electrocardiograph.
● Improper ambient light for
example using fluorescent
lamp in the room which ECG
record is taken.
● Improper HUM filter.
● Improper Earth system.
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● Relax the patient.
● Warm the patient with a
suitable blanket.
● Check electrodes connection.
●If the problem persists, use
Low pass or EMG filter.
● If the problem still persists,
take the following actions to
reduce AC noise.
● Check electrodes and lead
wires connection.
● Check that lead wires are not
tangled or connected to
ground.
● Check that the patient does
not contact the metal parts.
● Check that patient cable and
power cable have no contact.
● Turn on the HUM Filter.
● If the problem persists,
unplug the power cable (the
device runs on the battery).
● If the problem still persists,
noise source may be other
devices, room or its earth
system. Consequently, this
room is not suitable for ECG
recording.
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Table of Contents
Troubleshooting
