I I I . E M I / R F I
Laboratory tests performed by the Food and DrugAdministration (FDA) have shown that radio waves can cause unintended motion of Power chairs. Radio waves are a form of electromagnetic energy. When this energy adversely affects the operation of an electronic device, it is called Electromagnetic Interference (EMI) or Radio Frequency
Interference (RFI).
WARNING! Radio waves may interfere with the control of power chairs.
EMI-RFI—FREQUENTLY ASKED QUESTIONS (FAQS)
The following FAQs summarize what you should know about
Where do radio waves come from?
Radio waves are emitted from the antennas of cellular phones, mobile
computer links, microwave sources, and paging transmitters. Radio waves are a form of
electromagnetic energy (EM). Because electromagnetic energy is more intense closer to the transmitting antenna (source of emission), the EM fields from
If my power chair is affected by
νStrength of the radio waves
νConstruction of the power chair
νPosition of the power chair (whether it is on level ground or on an incline)
νWhether or not the power chair is in motion
An affected power chair’s movement can be erratic. It may move by itself or come to a sudden stop. Furthermore, it is possible for
Is there any way to know for sure whether radio waves are responsible for the unintended motion of my power chair?
Unfortunately, interference from radio wave sources may be difficult to recognize, since the signals from these sources are invisible and may be intermittent. However, the FDA
recommends that you report all incidents of unintended motion or brake release to the
power chair manufacturer, and if possible, note whether there was a radio wave source nearby at the time of the incident.
Has anyone been hurt from erratic, unintended motion of power chairs?
The FDAhas reports of injuries that resulted from the apparent uncontrolled motion of power chairs. However, it is unclear how many of these incidents were actually caused by radio wave interference.
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