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Muscle tremor
Causes
The patient is uncomfortable, tense, nervous.
The patient is cold and shivering.
The exam bed is too narrow or short to comfortably support arms and legs.
The arm or leg electrode straps are too tight.
Actions
Verify that the patient is comfortable, warm, and relaxed.
Check all electrode contacts.
If interference persists, turn the muscle-tremor filter on. If interference still persists,
the problem is probably electrical in nature. See the suggestions for reducing AC
interference (in a related troubleshooting tip).
AC interference
AC interference superimposes even-peaked, regular voltage on the waveforms.
Causes
The patient or technician was touching an electrode during recording.
The patient was touching a metal part of an exam table or bed.
A lead wire, patient cable, or power cord are broken.
Electrical devices in the immediate area, or lighting, or wiring concealed in walls or
floors are interfering.
An electrical outlet is improperly grounded.
The AC filter is turned off or set incorrectly.
Actions
Verify that the patient is not touching any metal.
Verify that the AC power cable is not touching the patient cable.
Verify that the proper AC filter is selected.
If interference persists, unplug the electrocardiograph from AC power and run it on
the battery. If this solves the problem, you’ll know that the noise was introduced
through the power line.
If interference still persists, the noise may be caused by other equipment in the
room or by poorly grounded power lines. Try moving to another room.
36 Troubleshooting CP 50™ and CP 50 Plus™ 12-lead resting electrocardiograph
40


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