Service manual

Neurodiagnostic Instruments Service Manual
6-18 Revised 2/18/05
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12. If in an office environment, are there any appliances
in the room with the system? Yes: ___ No: ___
Toasters, microwaves, computers, lamps,
coffee machines, etc.
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13. Unplug any non-critical care equipment in the O.R. Heat lamps, microscope, electric bed,
warmers, etc.
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14. Move the system to a different room away from the
existing location.
Move the system to a different part of the
building.
15. If using the system in the operating room,
momentarily unplug the Bovie Knife.
Disconnect Bovie from the wall outlet.
Troubleshooting Noise: Environmental Checklist
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Items to check Detail
Troubleshooting Noise: Electrode Application Checklist
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Items to check Detail
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1. If using a Concentric Needle Adapter, make sure it
has a good patient ground connection.
The ground wire on the adapter should have
a patient ground lead
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2. Do you have a good patient ground connection to the
amplifier?
Use the largest ground pad electrode you
have. Do not use a needle electrode for
ground.
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3. Verify that all electrodes and/or needles are inserted
tightly into the amplifier connectors.
Push in each connector at the amplifier
inputs.
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4. Verify that all electrodes and/or needles are attached
correctly to the patient.
Reapply electrodes if necessary.
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5. Bundle/braid all recording electrode leads together.
There should be no looping wires on the patient.
Helpful in reducing 50Hz/60Hz noise.
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6. Make sure the stim transducer cables, stim electrode
leads and any power cords are separated from the
recording electrode leads.
If the recording electrode leads must cross
other leads/cables, make sure they cross
perpendicular to each other.
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7. Use electrodes that are made of the same types of
metal and the same manufacturer.
Do not mix metals or manufacturers.
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8. Swap the existing electrodes with new ones. Electrodes do wear out.
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9. Try a different brand of electrodes to eliminate the
possibility of a common flaw in the electrodes.
Type, batch or style of electrode.
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10. Remove the EEG grounding mat if one exists. May act as an antenna for noise.
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11. Do not place the ground electrode on middle of
patient’s chest. Try the shoulder or thigh instead.
EKG residual waves look much like 60Hz.