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9.1.1 What is EMI?
WARNING!
Electromagnetic interference (EMI) comes from radio wave sources such as radio transmitters and
transceivers. (A “transceiver” is a device that both sends and receives radio wave signals). Powered
wheelchairs including the power positioning system may be susceptible to electromagnetic interference
emitted from sources such as radio stations, TV stations, amateur radio (HAM) transmitters, two way radios
and cellular phones. EMI can also be produced by conducted sources or electrostatic discharge (ESD).
9.1.2 What are the effects of EMI?
WARNING! Risk of serious injury and/or wheelchair damage and/or property damage.
Electromagnetic interference from radio wave sources can cause the powered wheelchair, without
warning, to release its brakes, move by itself or activate/move in unintended directions.
EMI can also permanently damage the wheelchair’s control system.
9.1.3 What are the sources of EMI?
WARNING!
There are a number of sources of electromagnetic interference in your everyday environment.
Some of these sources are obvious and easy to avoid. Others are not apparent and exposure is
unavoidable. The sources of radiated EMI can be broadly classified into three categories:
ELECTRO-MAGNETIC INTERFERENCE WARNING
WARNING!
It is very important that you read this information regarding the possible effects
of electromagnetic interference (EMI) on your Motion Concepts modular power positioning
system (MPPS) and your powered wheelchair base. Please also be certain to read the EMI
Warnings provided in the user manual for your wheelchair power base.
In order to minimize the risks associated with electromagnetic interference, please review
and follow the safety information and warnings provided herein.
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ELECTRO-MAGNETIC INTERFERENCE (EMI) INFORMATION
ELECTRO-MAGNETIC INTERFERENCE (EMI) INFORMATION
i. Hand-Held Portable Transceivers*
(typically with an antenna mounted directly on the transmitting unit)
Examples include:
Mobile phones;
Citizen band (CB) radios;
"Walkie-talkies";
Security, fire and police radios;
Lap-top computers (with phone or fax);
Electonic article surveillance systems;
Other personal communication devices;
*NOTE:
These devices can transmit signals while they are "ON", even when they are not being used
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ii. Medium Range Mobile Transceivers-
such as those used in police cars, fire trucks, ambulances,
and taxis. These usually have the antennae mounted on the outside of the vehicle; and
9.1 Electromagnetic Interference (EMI) from Radio Wave Sources
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