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POWER SEATING OWNERS MANUAL
CAUTION: IT IS VERY IMPORTANT THAT YOU READ THIS
INFORMATION 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 electromagnetic 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
interference (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 system. 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 provide 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-talkies,” security, fire, 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 antenna mounted on the outside of
the vehicle; and
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.
EMC Part: 19254300 Rev. 03 07/28/06
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