
P. 9
2.3. EMI
This portion of the content will provide the user with basic information that describes the
problems with EMI, known sources of EMI, protective measures either to lessen the possibility
or exposure or to minimize the degree of exposure, and suggested action should unexpected
or erratic movement occur.
ELECTROMAGNETIC INTERFERENCE (EMI) FROM RADIO WAVE SOURCES
Powered scooter 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 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 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 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 scooter model as shipped, with no further modication, has an immunity level
of 20 V/m without any accessories.
There are a number of sources of relatively intense electromagnetic elds in the 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 minimized.
CAUTION:
It is very important that you read this information regarding the possible eects of
electromagnetic interference on your electric scooter.