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3. EMI/RFI
This section provides the user with basic information about the problems with EMI,
known sources of EMI and protective measures either to reduce the possibility of
exposure or to minimize the degree of exposure. This section also shows some
conditions in which unexpected or erratic scooter movements may occur.
CAUTION
āIt is very important that you read this information regarding the possible effects
of electromagnetic interference on your electric KARMA Scooter
3.1 Electromagnetic Interference From Radio Wave Sources
3.1.1 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
directions. It can also permanently 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 certain intensity.
This amount of resistance 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 a 20 V/m immunity level, which would provide useful
protection from the more common sources of radiated EMI. This powered
vehicle model, with no further modification, has an immunity level of 20 V/m
without any accessories.
3.1.2 There are a number of sources of relatively intense electromagnetic fields in
our everyday environment. Some of these sources are obvious and easy to
avoid. Others are not apparent and exposure could be unavoidable. However,
we believe that by following the warnings listed below, your risk to EMI can be
greatly minimized.
3.2 The sources of radiated EMI can be broadly classified into three types.
3.2.1 Hand-held portable transceivers (transmitter-receivers) with the antenna
mounted directly on the transmitting unit, such as citizens band (CB) radios,
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