8
2.4 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.
Caution
: It is very important that you read this information regarding the possible
effects of electromagnetic interference on your electric scooter.
■
ELECTROMAGNETIC INTERFERENCE (EMI) FROM RADIO WAVE
SOURCES
Powered vehicle 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
s.
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 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 vehicle model as shipped, with no
further modification, has an immunity level of 20 V/m without any accessories.
There are a number of sources of relatively intense electromagnetic fields 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.
The sources of radiated EMI can be broadly classified into three types:
1.
Hand-held portable transceivers ( transmitter-receivers with the antenna mounted
directly on the transmitting unit. Examples include: citizens band (CB) radios,
“walkie talkie”, security, fire, and police transceivers, cellular telephones and other
personal communication devices.
Note:
Some mobile telephones and similar transmit signal 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 scooter.
2. SAFETY NOTICE
