33
Condition
Possible Causes
Actions
Muscle tremor
interference (random
irregular voltage
superimposed on
the waveforms). May
resemble or coincide
with AC interference
• User is uncomfortable, tense,
nervous.
• User is cold and shivering.
• QardioCore strap is too tight
• Not all electrodes are touching.
• User should get comfortable.
• Ensure that all electrodes are touching
the skin.
• If interference still persists, the problem
is probably electrical in nature. See the
following suggestions for reducing AC
interference.
AC interference
(even-peaked,
regular voltage
superimposed on
the waveforms). May
resemble or coincide
with muscle tremor
interference
• Electrodes that are dirty, loose, or
positioned on a bony area.
• Patient touching any metal
objects.
• Electrical devices in the
immediate area, lighting,
concealed wiring in walls or
floors.
• Improperly grounded electrical
outlet nearby.
• Incorrect AC filter frequency
setting or AC filter is turned off.
• Ensure that all electrodes are touching the
skin.
• Verify that the user is not touching any
metal.
• Verify that the proper AC filter is selected.
• Try moving to another room.
• If possible, unplug electrical devices in the
immediate area.
• If interference still persists, the noise may
be caused by other equipment in the
room or by poorly grounded power lines.