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Powered Wheelchair Electromagnetic Interference (EMI)
Because EM energy rapidly becomes more intense as one moves closer to the transmitting antenna (source),
the EM fi elds from hand-held radio wave sources (transceivers are of special concern). It is possible to un-
intentionally 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 and motorized scooters.
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 (transmitters-receivers), such as citizens band (CB)
radios, or turn ON personal communications devices, such as cellular phones, while the powered
wheel-chair 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 model of PaceSaver scooter has an immunity level of 20 volts per
meter
(20
v/m).
The immunity level of this model of PaceSaver is unknown.
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