8/16/2005
5
Powered Chair Electromagnetic Interference (EMI)
Because EM energy rapidly becomes more intense the closer one
moves to the transmitting antenna (source), the EM fields from hand-
held radio sources (transceivers) are of special concern. It is possible
to unintentionally bring high levels of EM energy very close to the
Powerchair’s control system while using these devices. This can
affect the Powerchair’s movement and braking. Therefore, the
warnings listed below are recommended to prevent possible
interference with the control system of the Powerchair.
WARNINGS
The following warnings listed below should reduce the chance of
unintended brake release or Powerchair 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
Powerchair 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
Powerchair OFF as soon as it is safe.
4. Be aware that adding accessories or components, or modifying
the Powerchair may make it more susceptible to EMI.
NOTE: There is no easy way to evaluate the overall immunity
of the powered chair.
Report all incidents of unintended movement or brake to your
Powerchair provider, and note whether there are sources of EMI
nearby.
