Electromagnetic interference (EMI) from
sources such as radio and TV stations,
amateur radio (HAM) transmitter,
two-way radios, and cellular phones can
affect powered scooters.
The following warnings listed below
should reduce the chance of unintended
brake release or powered scooter
movement which could result in serious
injury.
1. Do not operate hand-held trans-
ceivers (transmitters-receivers), such as
citizens’ band (CB) radios, or turn ON
personal communications devices, such
as 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
EMI (NOTE:There is no easy way to
evaluate the overall immunity of the
powered scooter).
Report all incidents of unintended move-
ment or brake to the powered scooter
manufacturer, and note whether there is
a source of EMI nearby.
ELECTROMAGNETIC INTERFERENCE
(EMI) FROM RADIO WAVE
SOURCES
Powered motorised scooters may be
susceptible to electromagnetic
interference (EMI), which is interfering
electromagnetic energy (EMI) emitted
from sources such as radio stations,
TV stations, amateur radio (HAM)
transmitters, two-way radios, and
cellular phones.
Interference (from radio wave sources)
can cause the powered 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 interfering EMI
energy can be measured in volts per
meter (V/M). Each powered scooter
can resist 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 achieving at least a 20 V/M
immunity level, which would provide
useful protection from the more
common sources of radiated EMI.
There are a number of sources of
relatively intense electromagnetic fields
in everyday environment. Some of these
sources are obvious and easy to avoid.
Others are not apparent and exposure
is unavoidable. However, we believe that
by following the warning listed below,
your risk to EMI will be minimised.The
sources of radiated EMI can be broadly
classified into three types:
1. Hand-held portable transceivers
(transmitters-receivers) with the
antenna mounted directly on the
transmitting unit.
Examples are: citizen band cellular
radios, “walkie talkie”, security, fire and
police transceivers, cellular telephones,
and other personal communication
devices.
* NOTE: some cellular telephones and
similar devices transmit signals while they
are on, even when not in used.
2. Medium-Range mobile transceivers,
such as those used in police cars, fire
trucks, ambulances, and taxis.These
usually have the antenna mounted on
the outside of the vehicle.
3. Long-range transmitters and
transceivers, such as commercial
broadcast transmitters (radio and
TV broadcast antenna towers) and
amateur (HAM) radios.
*NOTE: Other types of hand-held devices,
such as cordless phones, laptop computers,
AM/FM radios,TV sets, CD players, and
cassette players, and small appliances, such
as electric shavers and hair dryers, so far as
we know, are NOT likely to cause problems
to your powered scooter.
POWERED SCOOTER ELECTROMAG-
NETIC INTERFERENCE (EMI)
Because EMI energy rapidly becomes
more intense as one moves closer to
the transmitting antenna (source), the
EMI fields from hand-held radio sources
(transceivers) are of special concern.
It is possible to unintentionally bring high
levels of EMI energy very close to the
powered scooter’s control system while
using these devices.This can affect
powered scooter movement and
braking.Therefore, the warnings listed
below are recommended to prevent
possible interference with the control
system of the powered scooter.
EMI
EMI
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