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CHAPTER 11 - EMI WARNING
All types of electrically powered vehicles, such as powered wheelchairs
and motorized scooters (
in this text all types will be referred to as
“powered vehicles” ) may be susceptible to electromagnetic
interference (EMI), which is interfering electromagnetic energy (EM)
emitted from sources such as radio stations, TV stations, amateur radio
(HAM) transmitters, two way radios and cellular phones. The
interference (from radio wave sources) can cause the powered vehicle
to release its brakes, move by itself, or move in unintended direction. It
can also damage the powered vehicle’s control system. The intensity of
the interfering EM energy can be measured in volts per meter (V/m).
Each powered vehicle can resist EMI up to a certain intensity. This is
called its “immunity level”. The higher the immunity level, the greater
the protection. At this time, current technology is capable of achieving
at least 20 V/m immunity level, which would provide useful protection
from the more common sources of radiated EMI. This
SUPERLIGHT
as shipped with no further modification, has an immunity level of
20 V/m.
There are a number of sources of relatively intense electromagnetic
fields in everyday environment. Some of this 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 of EMI will be minimized.
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 include: citizen band (CB) radios,
“walkie talkies”, 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 being 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.