EMI/RFI
Unfortunately, EMI/RFI may be difficult to recognize, since the signals
from radio sources are invisible and may be intermittent. However, the
FDA recommends that you report all incidents of unintended motion or
unintended brake release of your electric power chair to the power
chair's manufacturer and, if possible, determine whether or not there
was a radio wave source nearby at the time of the incident.
One precaution you can take against inadvertent motion of your power
chair is to make certain that you or someone else is not the cause of the
unintended motion.
Turn off your power chair by removing the key from the key switch
when you are getting on or off your power chair.
Never leave the key in the key switch of an unattended power chair.
Each make and model of electric power chair differs in its ability to resist
EMI/RFI. That is, each power chair has a particular level of resistance to
EMI/RFI. This resistance is measured in volts per meter
V/m
. A
higher resistance level offers greater protection against EMI/RFI. In
other words, an electric power chair with a high resistance level is less
likely to be affected by a strong radio source than is an electric power
chair with a low resistance level.
The FDA has written to electric power chair manufacturer and requested
that those manufactures test their new models of power chairs to be
certain that they provide a reasonable degree of resistance against
EMI/RFI. The FDA has stated that all newly manufactured models of
electric power chairs should have a resistance level of at least 20 V/m.
This resistance level provides a reasonable degree of protection
against the common sources of EMI/RFI.
Is there any way to know for certain whether or not radio waves are the
cause of any unintended motion of my power chair?
Are all power chairs susceptible to EMI/ RFI ?
What is the FDA doing about the problem?
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Summary of Contents for LY-EB103
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