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1.5.2. Powered Wheelchair Electromagnetic Interference (EMI)
Because EM energy rapidly becomes more intense as one moves closer to the transmitting antenna
(source), the EM elds from hand-held radio wave sources (transceivers) are of special concern. It is pos-
sible to unintentionally bring high levels of EM energy very close to the powered wheelchair’s control sys-
tem while using these devices. This can aect powered wheelchair movement and braking. Therefore, the
warnings listed below are recommended to prevent possible interference with the control system of the
powered wheelchair.
2) Be aware of nearby transmitters, such as radio or TV stations, and try to avoid coming
close to them;
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 or distributor, and note whether there is a source of EMI nearby.
Electromagnetic interference (EMI) from sources such as radio and TV stations, amateur radio
(HAM)transmitters,two-wayradios,andcellularphonescanaectpoweredwheelchairsand
motorized scooters. Following the warnings listed below should reduce the chance of unin-
tended 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 communication devices, such as cellular phones, while the
powered wheelchair is turned ON;
3) If unintended movement or brake release occurs, turn the powered wheelchair OFF as soon
as it is safe;
WARNING
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 immunity level of 20 V/m.*
*) And it has an emission level of CISPR 11 Group 1 Class B.
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