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ELECTROMAGNETIC INTERFERENCE (EMI)
The rapid development of electronics, especially in the area of communications, has saturated
our environment with electromagnetic (EMI) radio waves that are emitted by television, radio
and communication signals. These EMI wave are invisible and their strength increases as one
approach the source. All electrical conductors act as antennas to the EMI signals and, to
varying degrees, all power scooters and scooters are susceptible to electromagnetic interference
(EMI). The interference could result in abnormal, unintentional movement and/or erratic
control of the vehicle. The United States Food and drug Administration (FDA) suggests that the
following statement be incorporated to the user's manual for all power scooter like the S11E.
Power scooters may as susceptible to electromagnetic interference (EMI), which is interfering
electromagnetic energy emitted from sources such as radio stations, TV stations, amateur radio
(HAN) transmitter, two‐way radios, cellular phones and alarm systems of shops. The
interference (from radio wave sources) can cause the power scooter to release its brakes, move
by itself or move in unintended directions. It can also permanently damage the powered
scooter's control system. The intensity of the EM energy can be measured in volts per meter
(V/m).Each powered scooter can resist EMI up to a certain intensity. This is called " immunity
level". The higher the immunity level the greater the protection. At this time, current
technology is capable of providing at least 20 V/m of immunity level, which would provide
useful protection against common sources of radiated EMI.
Following the warnings listed below should reduce the chance of unintended brake release or
powered scooter movement that could result in serious injury:
1.
Do not turn on hand‐held personal communication devices such as citizens band (CB)
radios and cellular phones while the powered scooter 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 scooter off as soon as it
is safe.
4.
Be aware that adding accessories or components, or modifying the powered scooter, may
make it more susceptible to interference from radio wave sources .(Note: It is difficult to
evaluate the effect on the overall immunity of the powered scooter)
5.
Report all incidents of unintended movement or brake release to the powered scooter
manufacturer, and note whether there is a radio wave source nearby.
TURN OFF YOUR POWERED SCOOTER AS SOON AS POSSIBLE WHEN
EXPERIENCING THE FOLLOWING:
• Unintentional scooter movements.
• Unintended or uncontrollable direction.
• Unexpected brake release.
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