Tilt/Recline Seating Systems® 10 Part No. 1114822
GENERAL GUIDELINESSECTION 1
WARNING
CAUTION: IT IS VERY IMPORTANT THAT YOU READ THIS INFOR-
MATION REGARDING THE POSSIBLE EFFECTS OF ELECTRO-
MAGNETIC INTERFERENCE ON YOUR POWERED WHEELCHAIR.
Electromagnetic Interference (EMI) From Radio Wave Sources
Powered wheelchairs and motorized scooters (in this text, both will be
referred to as powered wheelchairs) may be susceptible to electro-
magnetic interference (EMI), which is interfering electromagnetic energy
(EM) emitted from sources such as radio stations, TV stations, amateur
radio (HAM) transmitters, two way radios and cellular phones. The inter-
ference (from radio wave sources) can cause the powered wheelchair to
release its brakes, move by itself or move in unintended directions.
It can also permanently damage the powered wheelchair's control sys-
tem. The intensity of the interfering EM energy can be measured in volts
per meter (V/m). Each powered wheelchair can resist EMI up to a certain
intensity. This is called its "immunity level." The higher the immunity
level, the greater the protection. At this time, current technology is
capable of achieving at least a 20 V/m immunity level, which would pro-
vide useful protection from the more common sources of radiated EMI.
There are a number of sources of relatively intense electromagnetic fields
in the everyday environment. Some of these sources are obvious and easy
to avoid. Others are not apparent and exposure is unavoidable. However,
we believe that by following the warnings listed, your risk to EMI will be
minimized.
The sources of radiated EMI can be broadly classified into three types:
1) Hand-held Portable transceivers (transmitters-receivers with the
antenna mounted directly on the transmitting unit. Examples include:
citizens band (CB) radios, "walkie talkie," security, fire, and police
transceivers, cellular telephones and other personal communication
devices.
NOTE: Some cellular telephones and similar devices transmit signals while they are ON, even
when not being used.
2) Medium-range mobile transceivers, such as those used in police cars,
fire trucks, ambulances and taxis. These usually have the antennas
mounted on the outside of the vehicle.
3) Long-range transmitters and transceivers, such as commercial
broadcast transmitters (radio and TV broadcast antenna towers) and
amateur (HAM) radios.
NOTE: Other types of hand-held devices, such as cordless phones, laptop computers, AM-FM
radios, TV sets, CD players, cassette players and small appliances, such as electric shavers and
hair dryers, so far as we know, are not likely to cause EMI problems to your powered wheelchair.
GENERAL GUIDELINES
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