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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, ambulance,
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, and 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.
10.7 Powered Wheelchair Electromagnetic Interference (EMI)
Because EM energy rapidly becomes more intense as one moves closer to the transmitting
antenna (source), the EM fields from hand-held radio wave sources (transceivers) are of special
concern. It is possible to unintentionally bring high levels of EM energy very close to the
powered wheelchair’s control system while using these devices. This can affect powered
wheelchair movement and braking. Therefore, the warnings listed below are recommended to
prevent possible interference with the control system of the powered wheelchair.
WARNINGS
Electromagnetic interference (EMI) from sources such as radio and TV stations, amateur radio
(HAM) transmitters, two way radios and cellular phones can affect powered wheelchairs.
Following the warnings listed below should reduce the chance of unintended brake release or
powered wheelchair movement which could result in serious injury.
1) Do not operate hand held transceivers (transmitter-receivers), such as citizens band (CB)
radios, or turn ON personal communication devices, such as cellular phones, while the powered
wheelchair is turned ON.
2) Be aware of nearby transmitters, such as radio or TV stations, and try to avoid coming close
to them;
3) If unintended movement or brake release occurs, turn the powered wheelchair OFF as soon
as it is safe.
4) Be aware that adding accessories or components, or modifying the powered wheelchair, may
make it more susceptible to EMI (note: There is no easy way to evaluate their effect on the
overall immunity of the powered wheelchair); and
5) Report all incidents of unintended movement or brake release to the powered wheelchair
manufacturer, and note whether there is a source of EMI nearby.
Important Information
1) 20 volts per meter (v/m) is a generally achievable and useful immunity level against EMI (as
of May 1994) (the higher the level the greater the protection)
2) This product has an unknown immunity.
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